Bump to v0.5.0 (#430 )

Change WebRTC metrics to be request/response from the Engine (#410 )
* Add in a Metrics request/response handler Signed-off-by: Paul Tagliamonte <paul@kittycad.io> * Update @kittycad/lib to 0.0.37 Signed-off-by: Paul Tagliamonte <paul@kittycad.io> * Fix up type issues Signed-off-by: Paul Tagliamonte <paul@kittycad.io> * yarn fmt * Remove VITE_KC_CONNECTION_WEBRTC_REPORT_STATS_MS Signed-off-by: Paul Tagliamonte <paul@kittycad.io> --------- Signed-off-by: Paul Tagliamonte <paul@kittycad.io> Co-authored-by: Kurt Hutten <k.hutten@protonmail.ch>
2023-09-11 05:16:53 -04:00 · 2023-09-11 09:04:46 +10:00 · 2023-09-09 05:38:36 +00:00 · 2023-09-08 16:40:08 -04:00 · 2023-09-08 13:02:02 -07:00 · 2023-09-08 11:20:59 -07:00
102 changed files with 29174 additions and 17735 deletions
--- a/.env.development
+++ b/.env.development
@ -1,4 +1,6 @@
 VITE_KC_API_WS_MODELING_URL=wss://api.dev.kittycad.io/ws/modeling/commands
 VITE_KC_API_BASE_URL=https://api.dev.kittycad.io
 VITE_KC_SITE_BASE_URL=https://dev.kittycad.io
+VITE_KC_SKIP_AUTH=false
 VITE_KC_CONNECTION_TIMEOUT_MS=5000
+VITE_KC_SENTRY_DSN=
--- a/.env.production
+++ b/.env.production
@ -1,4 +1,6 @@
 VITE_KC_API_WS_MODELING_URL=wss://api.kittycad.io/ws/modeling/commands
 VITE_KC_API_BASE_URL=https://api.kittycad.io
 VITE_KC_SITE_BASE_URL=https://kittycad.io
+VITE_KC_SKIP_AUTH=false
 VITE_KC_CONNECTION_TIMEOUT_MS=15000
+VITE_KC_SENTRY_DSN=https://a814f2f66734989a90367f48feee28ca@o1042111.ingest.sentry.io/4505789425844224
--- a/.eslintignore
+++ b/.eslintignore
@ -1 +1 @@
-src/wasm-lib/pkg/wasm_lib.js
+src/wasm-lib/*
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -1,4 +1,4 @@
-name: CI 
+name: CI

 on:
  pull_request:
@ -13,17 +13,31 @@ jobs:
  check-format:
    runs-on: 'ubuntu-20.04'
    steps:
-
      - uses: actions/checkout@v3
-
      - uses: actions/setup-node@v3
        with:
          node-version-file: '.nvmrc'
-
+          cache: 'yarn'
      - run: yarn install
-
      - run: yarn fmt-check

+  check-types:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'yarn'
+      - run: yarn install
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "./src/wasm-lib"
+
+      - run: yarn build:wasm
+      - run: yarn tsc
+

  build-test-web:
    runs-on: ubuntu-20.04
@ -36,12 +50,15 @@ jobs:
      - uses: actions/setup-node@v3
        with:
          node-version-file: '.nvmrc'
+          cache: 'yarn'

      - run: yarn install

-      - run: yarn build:wasm
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "./src/wasm-lib"

-      - run: yarn tsc
+      - run: yarn build:wasm

      - run: yarn simpleserver:ci

@ -49,14 +66,12 @@ jobs:

      - run: yarn test:cov

-      - run: yarn test:rust
-      
      - id: export_version
        run: echo "version=`cat package.json | jq -r '.version'`" >> "$GITHUB_OUTPUT"


  build-apps:
-    needs: [check-format, build-test-web]
+    needs: [check-format, build-test-web, check-types]
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
@ -87,6 +102,10 @@ jobs:
        with:
          workspaces: './src-tauri -> target'

+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "./src/wasm-lib"
+
      - name: wasm prep
        shell: bash
        run: |
@ -110,15 +129,22 @@ jobs:
      - name: Fix format
        run: yarn fmt

+      - name: install apple silicon target mac
+        if: matrix.os == 'macos-latest'
+        run: |
+          rustup target add aarch64-apple-darwin
+
      - name: Build the app for the current platform (no upload)
        uses: tauri-apps/tauri-action@v0
        env:
          TAURI_PRIVATE_KEY: ${{ secrets.TAURI_PRIVATE_KEY }}
          TAURI_KEY_PASSWORD: ${{ secrets.TAURI_KEY_PASSWORD }}
+        with:
+          args: ${{ matrix.os == 'macos-latest' && '--target universal-apple-darwin' || '' }}

      - uses: actions/upload-artifact@v3
        with:
-          path: src-tauri/target/release/bundle/*/*
+          path: ${{ matrix.os == 'macos-latest' && 'src-tauri/target/universal-apple-darwin/release/bundle/*/*' || 'src-tauri/target/release/bundle/*/*' }}


  publish-apps-release:
@ -133,8 +159,7 @@ jobs:

      - name: Generate the update static endpoint
        run: |
-          ls -l artifact
-          ls -l artifact/*
+          ls -l artifact/*/*itty*
          DARWIN_SIG=`cat artifact/macos/*.app.tar.gz.sig`
          LINUX_SIG=`cat artifact/appimage/*.AppImage.tar.gz.sig`
          WINDOWS_SIG=`cat artifact/nsis/*.nsis.zip.sig`
@ -142,11 +167,11 @@ jobs:
          jq --null-input \
            --arg version "v${VERSION_NO_V}" \
            --arg darwin_sig "$DARWIN_SIG" \
-            --arg darwin_url "$RELEASE_DIR/macos/kittycad-modeling-app.app.tar.gz" \
+            --arg darwin_url "$RELEASE_DIR/macos/KittyCAD%20Modeling.app.tar.gz" \
            --arg linux_sig "$LINUX_SIG" \
-            --arg linux_url "$RELEASE_DIR/appimage/kittycad-modeling-app_${VERSION_NO_V}_amd64.AppImage.tar.gz" \
+            --arg linux_url "$RELEASE_DIR/appimage/kittycad-modeling_${VERSION_NO_V}_amd64.AppImage.tar.gz" \
            --arg windows_sig "$WINDOWS_SIG" \
-            --arg windows_url "$RELEASE_DIR/nsis/kittycad-modeling-app_${VERSION_NO_V}_x64-setup.nsis.zip" \
+            --arg windows_url "$RELEASE_DIR/nsis/KittyCAD%20Modeling_${VERSION_NO_V}_x64-setup.nsis.zip" \
            '{
              "version": $version,
              "platforms": {
@ -154,6 +179,10 @@ jobs:
                  "signature": $darwin_sig,
                  "url": $darwin_url
                },
+                "darwin-aarch64": {
+                  "signature": $darwin_sig,
+                  "url": $darwin_url
+                },
                "linux-x86_64": {
                  "signature": $linux_sig,
                  "url": $linux_url
@ -175,17 +204,22 @@ jobs:
        uses: google-github-actions/setup-gcloud@v1.1.1
        with:
          project_id: kittycadapi
-      
+
      - name: Upload release files to public bucket
        uses: google-github-actions/upload-cloud-storage@v1.0.3
        with:
          path: artifact
-          glob: '*/kittycad-modeling-app*'
+          glob: '*/*itty*'
          parent: false
-          destination: dl.kittycad.io/releases/modeling-app/v${{ env.VERSION_NO_V }} 
-      
+          destination: dl.kittycad.io/releases/modeling-app/v${{ env.VERSION_NO_V }}
+
      - name: Upload update endpoint to public bucket
        uses: google-github-actions/upload-cloud-storage@v1.0.3
        with:
          path: last_update.json
          destination: dl.kittycad.io/releases/modeling-app
+
+      - name: Upload release files to Github
+        uses: softprops/action-gh-release@v1
+        with:
+          files: artifact/*/*itty*
--- a/.prettierignore
+++ b/.prettierignore
@ -5,3 +5,5 @@ coverage
 # Ignore Rust projects:
 *.rs
 target
+src/wasm-lib/pkg
+src/wasm-lib/kcl/bindings
--- a/README.md
+++ b/README.md
@ -86,3 +86,24 @@ The PR may serve as a place to discuss the human-readable changelog and extra QA
 3. Create a new release and tag pointing to the bump version commit using semantic versioning `v{x}.{y}.{z}`

 4. A new Action kicks in at https://github.com/KittyCAD/modeling-app/actions, uploading artifacts to the release
+
+## Fuzzing the parser
+
+Make sure you install cargo fuzz:
+
+```bash
+$ cargo install cargo-fuzz
+```
+
+```bash
+$ cd src/wasm-lib/kcl
+
+# list the fuzz targets
+$ cargo fuzz list
+
+# run the parser fuzzer
+$ cargo +nightly fuzz run parser
+```
+
+For more information on fuzzing you can check out 
+[this guide](https://rust-fuzz.github.io/book/cargo-fuzz.html).
--- a/docs/kcl.json
+++ b/docs/kcl.json
--- a/docs/kcl.md
+++ b/docs/kcl.md
--- a/package.json
+++ b/package.json
@ -1,30 +1,35 @@
 {
  "name": "untitled-app",
-  "version": "0.2.0",
+  "version": "0.5.0",
  "private": true,
  "dependencies": {
+    "@codemirror/autocomplete": "^6.9.0",
    "@fortawesome/fontawesome-svg-core": "^6.4.2",
    "@fortawesome/free-brands-svg-icons": "^6.4.2",
    "@fortawesome/free-solid-svg-icons": "^6.4.2",
    "@fortawesome/react-fontawesome": "^0.2.0",
    "@headlessui/react": "^1.7.13",
    "@headlessui/tailwindcss": "^0.2.0",
-    "@kittycad/lib": "^0.0.34",
+    "@kittycad/lib": "^0.0.37",
+    "@lezer/javascript": "^1.4.7",
+    "@open-rpc/client-js": "^1.8.1",
    "@react-hook/resize-observer": "^1.2.6",
+    "@sentry/react": "^7.65.0",
    "@tauri-apps/api": "^1.3.0",
    "@testing-library/jest-dom": "^5.14.1",
    "@testing-library/react": "^13.0.0",
    "@testing-library/user-event": "^13.2.1",
+    "@ts-stack/markdown": "^1.5.0",
    "@types/node": "^16.7.13",
    "@types/react": "^18.0.0",
    "@types/react-dom": "^18.0.0",
-    "@uiw/codemirror-extensions-langs": "^4.21.9",
-    "@uiw/react-codemirror": "^4.15.1",
+    "@uiw/react-codemirror": "^4.21.13",
    "@xstate/react": "^3.2.2",
    "crypto-js": "^4.1.1",
    "formik": "^2.4.3",
    "fuse.js": "^6.6.2",
    "http-server": "^14.1.1",
+    "json-rpc-2.0": "^1.6.0",
    "re-resizable": "^6.9.9",
    "react": "^18.2.0",
    "react-dom": "^18.2.0",
@ -42,6 +47,8 @@
    "typescript": "^4.4.2",
    "uuid": "^9.0.0",
    "vitest": "^0.34.1",
+    "vscode-jsonrpc": "^8.1.0",
+    "vscode-languageserver-protocol": "^3.17.3",
    "wasm-pack": "^0.12.1",
    "web-vitals": "^2.1.0",
    "ws": "^8.13.0",
@ -56,14 +63,14 @@
    "build:both:local": "yarn build:wasm && vite build",
    "test": "vitest --mode development",
    "test:nowatch": "vitest run --mode development",
-    "test:rust": "(cd src/wasm-lib && cargo test && cargo clippy)",
+    "test:rust": "(cd src/wasm-lib && cargo test --all && cargo clippy --all --tests)",
    "test:cov": "vitest run --coverage --mode development",
    "simpleserver:ci": "http-server ./public --cors -p 3000 &",
    "simpleserver": "http-server ./public --cors -p 3000",
    "fmt": "prettier --write ./src",
    "fmt-check": "prettier --check ./src",
-    "build:wasm": "yarn wasm-prep && (cd src/wasm-lib && wasm-pack build --target web --out-dir pkg && cargo test --all) && cp src/wasm-lib/pkg/wasm_lib_bg.wasm public && yarn fmt && yarn remove-importmeta",
-    "remove-importmeta": "sed -i 's/import.meta.url//g' \"./src/wasm-lib/pkg/wasm_lib.js\"; sed -i '' 's/import.meta.url//g' \"./src/wasm-lib/pkg/wasm_lib.js\" || echo \"sed for both mac and linux\"",
+    "build:wasm": "yarn wasm-prep && (cd src/wasm-lib && wasm-pack build --target web --out-dir pkg && cargo test -p kcl-lib export_bindings) && cp src/wasm-lib/pkg/wasm_lib_bg.wasm public && yarn fmt && yarn remove-importmeta",
+    "remove-importmeta": "sed -i 's/import.meta.url/window.location.origin/g' \"./src/wasm-lib/pkg/wasm_lib.js\"; sed -i '' 's/import.meta.url/window.location.origin/g' \"./src/wasm-lib/pkg/wasm_lib.js\" || echo \"sed for both mac and linux\"",
    "wasm-prep": "rm -rf src/wasm-lib/pkg && mkdir src/wasm-lib/pkg && rm -rf src/wasm-lib/kcl/bindings",
    "lint": "eslint --fix src",
    "bump-jsons": "echo \"$(jq --arg v \"$VERSION\" '.version=$v' package.json --indent 2)\" > package.json && echo \"$(jq --arg v \"$VERSION\" '.package.version=$v' src-tauri/tauri.conf.json --indent 2)\" > src-tauri/tauri.conf.json"
@ -91,6 +98,7 @@
    "@babel/preset-env": "^7.22.9",
    "@tauri-apps/cli": "^1.3.1",
    "@types/crypto-js": "^4.1.1",
+    "@types/debounce": "^1.2.1",
    "@types/isomorphic-fetch": "^0.0.36",
    "@types/react-modal": "^3.16.0",
    "@types/uuid": "^9.0.1",
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@ -648,6 +648,12 @@ dependencies = [
 "cfg-if",
 ]

+[[package]]
+name = "equivalent"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
 [[package]]
 name = "errno"
 version = "0.3.1"
@ -1150,7 +1156,7 @@ dependencies = [
 "futures-sink",
 "futures-util",
 "http",
- "indexmap",
+ "indexmap 1.9.3",
 "slab",
 "tokio",
 "tokio-util",
@ -1163,6 +1169,12 @@ version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"

+[[package]]
+name = "hashbrown"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
+
 [[package]]
 name = "heck"
 version = "0.3.3"
@ -1378,7 +1390,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
 dependencies = [
 "autocfg",
- "hashbrown",
+ "hashbrown 0.12.3",
+ "serde",
+]
+
+[[package]]
+name = "indexmap"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d5477fe2230a79769d8dc68e0eabf5437907c0457a5614a9e8dddb67f65eb65d"
+dependencies = [
+ "equivalent",
+ "hashbrown 0.14.0",
 "serde",
 ]

@ -2128,7 +2151,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9bd9647b268a3d3e14ff09c23201133a62589c658db02bb7388c7246aafe0590"
 dependencies = [
 "base64 0.21.2",
- "indexmap",
+ "indexmap 1.9.3",
 "line-wrap",
 "quick-xml",
 "serde",
@ -2701,14 +2724,15 @@ dependencies = [

 [[package]]
 name = "serde_with"
-version = "2.3.3"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07ff71d2c147a7b57362cead5e22f772cd52f6ab31cfcd9edcd7f6aeb2a0afbe"
+checksum = "1402f54f9a3b9e2efe71c1cea24e648acce55887983553eeb858cf3115acfd49"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.2",
 "chrono",
 "hex",
- "indexmap",
+ "indexmap 1.9.3",
+ "indexmap 2.0.0",
 "serde",
 "serde_json",
 "serde_with_macros",
@ -2717,9 +2741,9 @@ dependencies = [

 [[package]]
 name = "serde_with_macros"
-version = "2.3.3"
+version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "881b6f881b17d13214e5d494c939ebab463d01264ce1811e9d4ac3a882e7695f"
+checksum = "9197f1ad0e3c173a0222d3c4404fb04c3afe87e962bcb327af73e8301fa203c7"
 dependencies = [
 "darling",
 "proc-macro2",
@ -3075,9 +3099,9 @@ dependencies = [

 [[package]]
 name = "tauri-build"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "929b3bd1248afc07b63e33a6a53c3f82c32d0b0a5e216e4530e94c467e019389"
+checksum = "7d2edd6a259b5591c8efdeb9d5702cb53515b82a6affebd55c7fd6d3a27b7d1b"
 dependencies = [
 "anyhow",
 "cargo_toml",
@ -3088,7 +3112,6 @@ dependencies = [
 "serde_json",
 "tauri-utils",
 "tauri-winres",
- "winnow",
 ]

 [[package]]
@ -3186,12 +3209,13 @@ dependencies = [

 [[package]]
 name = "tauri-utils"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a6f9c2dafef5cbcf52926af57ce9561bd33bb41d7394f8bb849c0330260d864"
+checksum = "03fc02bb6072bb397e1d473c6f76c953cda48b4a2d0cce605df284aa74a12e84"
 dependencies = [
 "brotli",
 "ctor",
+ "dunce",
 "glob",
 "heck 0.4.1",
 "html5ever",
@ -3407,7 +3431,7 @@ version = "0.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56c59d8dd7d0dcbc6428bf7aa2f0e823e26e43b3c9aca15bbc9475d23e5fa12b"
 dependencies = [
- "indexmap",
+ "indexmap 1.9.3",
 "nom8",
 "serde",
 "serde_spanned",
@ -3420,7 +3444,7 @@ version = "0.19.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "239410c8609e8125456927e6707163a3b1fdb40561e4b803bc041f466ccfdc13"
 dependencies = [
- "indexmap",
+ "indexmap 1.9.3",
 "serde",
 "serde_spanned",
 "toml_datetime 0.6.2",
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@ -12,7 +12,7 @@ rust-version = "1.60"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [build-dependencies]
-tauri-build = { version = "1.3.0", features = [] }
+tauri-build = { version = "1.4.0", features = [] }

 [dependencies]
 anyhow = "1"
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@ -7,8 +7,8 @@
    "distDir": "../build"
  },
  "package": {
-    "productName": "kittycad-modeling-app",
-    "version": "0.2.0"
+    "productName": "kittycad-modeling",
+    "version": "0.5.0"
  },
  "tauri": {
    "allowlist": {
--- a/src-tauri/tauri.macos.conf.json
+++ b/src-tauri/tauri.macos.conf.json
@ -0,0 +1,7 @@
+
+{
+  "$schema": "../node_modules/@tauri-apps/cli/schema.json",
+  "package": {
+    "productName": "KittyCAD Modeling"
+  }
+}
--- a/src-tauri/tauri.windows.conf.json
+++ b/src-tauri/tauri.windows.conf.json
@ -0,0 +1,7 @@
+
+{
+  "$schema": "../node_modules/@tauri-apps/cli/schema.json",
+  "package": {
+    "productName": "KittyCAD Modeling"
+  }
+}
--- a/src/App.tsx
+++ b/src/App.tsx
@ -2,7 +2,6 @@ import {
  useRef,
  useEffect,
  useLayoutEffect,
-  useMemo,
  useCallback,
  MouseEventHandler,
 } from 'react'
@ -10,15 +9,7 @@ import { DebugPanel } from './components/DebugPanel'
 import { v4 as uuidv4 } from 'uuid'
 import { asyncParser } from './lang/abstractSyntaxTree'
 import { _executor } from './lang/executor'
-import CodeMirror from '@uiw/react-codemirror'
-import { langs } from '@uiw/codemirror-extensions-langs'
-import { linter, lintGutter } from '@codemirror/lint'
-import { ViewUpdate } from '@codemirror/view'
-import {
-  lineHighlightField,
-  addLineHighlight,
-} from './editor/highlightextension'
-import { PaneType, Selections, useStore } from './useStore'
+import { PaneType, useStore } from './useStore'
 import { Logs, KCLErrors } from './components/Logs'
 import { CollapsiblePanel } from './components/CollapsiblePanel'
 import { MemoryPanel } from './components/MemoryPanel'
@ -29,9 +20,9 @@ import {
  EngineCommand,
  EngineCommandManager,
 } from './lang/std/engineConnection'
-import { isOverlap, throttle } from './lib/utils'
+import { throttle } from './lib/utils'
 import { AppHeader } from './components/AppHeader'
-import { KCLError, kclErrToDiagnostic } from './lang/errors'
+import { KCLError } from './lang/errors'
 import { Resizable } from 're-resizable'
 import {
  faCode,
@ -39,93 +30,75 @@ import {
  faSquareRootVariable,
 } from '@fortawesome/free-solid-svg-icons'
 import { useHotkeys } from 'react-hotkeys-hook'
-import { TEST } from './env'
 import { getNormalisedCoordinates } from './lib/utils'
-import { Themes, getSystemTheme } from './lib/theme'
 import { isTauri } from './lib/isTauri'
-import { useLoaderData, useParams } from 'react-router-dom'
-import { writeTextFile } from '@tauri-apps/api/fs'
-import { PROJECT_ENTRYPOINT } from './lib/tauriFS'
+import { useLoaderData } from 'react-router-dom'
 import { IndexLoaderData } from './Router'
-import { toast } from 'react-hot-toast'
 import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
+import { onboardingPaths } from 'routes/Onboarding'
+import { cameraMouseDragGuards } from 'lib/cameraControls'
+import { CameraDragInteractionType_type } from '@kittycad/lib/dist/types/src/models'
+import { CodeMenu } from 'components/CodeMenu'
+import { TextEditor } from 'components/TextEditor'
+import { Themes, getSystemTheme } from 'lib/theme'

 export function App() {
  const { code: loadedCode, project } = useLoaderData() as IndexLoaderData
-  const pathParams = useParams()
+
  const streamRef = useRef<HTMLDivElement>(null)
  useHotKeyListener()
  const {
-    editorView,
-    setEditorView,
-    setSelectionRanges,
-    selectionRanges,
    addLog,
    addKCLError,
-    code,
    setCode,
    setAst,
    setError,
    setProgramMemory,
    resetLogs,
    resetKCLErrors,
-    selectionRangeTypeMap,
    setArtifactMap,
    engineCommandManager,
    setEngineCommandManager,
+    highlightRange,
    setHighlightRange,
    setCursor2,
-    sourceRangeMap,
    setMediaStream,
    setIsStreamReady,
    isStreamReady,
-    isMouseDownInStream,
-    cmdId,
-    setCmdId,
-    formatCode,
+    buttonDownInStream,
    openPanes,
    setOpenPanes,
    didDragInStream,
-    setDidDragInStream,
    setStreamDimensions,
    streamDimensions,
+    setIsExecuting,
+    defferedCode,
  } = useStore((s) => ({
-    editorView: s.editorView,
-    setEditorView: s.setEditorView,
-    setSelectionRanges: s.setSelectionRanges,
-    selectionRanges: s.selectionRanges,
-    setGuiMode: s.setGuiMode,
    addLog: s.addLog,
-    code: s.code,
+    defferedCode: s.defferedCode,
    setCode: s.setCode,
    setAst: s.setAst,
    setError: s.setError,
    setProgramMemory: s.setProgramMemory,
    resetLogs: s.resetLogs,
    resetKCLErrors: s.resetKCLErrors,
-    selectionRangeTypeMap: s.selectionRangeTypeMap,
    setArtifactMap: s.setArtifactNSourceRangeMaps,
    engineCommandManager: s.engineCommandManager,
    setEngineCommandManager: s.setEngineCommandManager,
+    highlightRange: s.highlightRange,
    setHighlightRange: s.setHighlightRange,
-    isShiftDown: s.isShiftDown,
-    setCursor: s.setCursor,
    setCursor2: s.setCursor2,
-    sourceRangeMap: s.sourceRangeMap,
    setMediaStream: s.setMediaStream,
    isStreamReady: s.isStreamReady,
    setIsStreamReady: s.setIsStreamReady,
-    isMouseDownInStream: s.isMouseDownInStream,
-    cmdId: s.cmdId,
-    setCmdId: s.setCmdId,
-    formatCode: s.formatCode,
+    buttonDownInStream: s.buttonDownInStream,
    addKCLError: s.addKCLError,
    openPanes: s.openPanes,
    setOpenPanes: s.setOpenPanes,
    didDragInStream: s.didDragInStream,
-    setDidDragInStream: s.setDidDragInStream,
    setStreamDimensions: s.setStreamDimensions,
    streamDimensions: s.streamDimensions,
+    setIsExecuting: s.setIsExecuting,
  }))

  const {
@ -133,7 +106,7 @@ export function App() {
      context: { token },
    },
    settings: {
-      context: { showDebugPanel, theme, onboardingStatus },
+      context: { showDebugPanel, onboardingStatus, cameraControls, theme },
    },
  } = useGlobalStateContext()

@ -154,7 +127,7 @@ export function App() {
  useHotkeys('shift + d', () => togglePane('debug'))

  const paneOpacity =
-    onboardingStatus === 'camera'
+    onboardingStatus === onboardingPaths.CAMERA
      ? 'opacity-20'
      : didDragInStream
      ? 'opacity-40'
@ -174,87 +147,12 @@ export function App() {
    }
  }, [loadedCode, setCode])

-  // const onChange = React.useCallback((value: string, viewUpdate: ViewUpdate) => {
-  const onChange = (value: string, viewUpdate: ViewUpdate) => {
-    setCode(value)
-    if (isTauri() && pathParams.id) {
-      // Save the file to disk
-      // Note that PROJECT_ENTRYPOINT is hardcoded until we support multiple files
-      writeTextFile(pathParams.id + '/' + PROJECT_ENTRYPOINT, value).catch(
-        (err) => {
-          // TODO: add Sentry per GH issue #254 (https://github.com/KittyCAD/modeling-app/issues/254)
-          console.error('error saving file', err)
-          toast.error('Error saving file, please check file permissions')
-        }
-      )
-    }
-    if (editorView) {
-      editorView?.dispatch({ effects: addLineHighlight.of([0, 0]) })
-    }
-  } //, []);
-  const onUpdate = (viewUpdate: ViewUpdate) => {
-    if (!editorView) {
-      setEditorView(viewUpdate.view)
-    }
-    const ranges = viewUpdate.state.selection.ranges
-
-    const isChange =
-      ranges.length !== selectionRanges.codeBasedSelections.length ||
-      ranges.some(({ from, to }, i) => {
-        return (
-          from !== selectionRanges.codeBasedSelections[i].range[0] ||
-          to !== selectionRanges.codeBasedSelections[i].range[1]
-        )
-      })
-
-    if (!isChange) return
-    const codeBasedSelections: Selections['codeBasedSelections'] = ranges.map(
-      ({ from, to }) => {
-        if (selectionRangeTypeMap[to]) {
-          return {
-            type: selectionRangeTypeMap[to],
-            range: [from, to],
-          }
-        }
-        return {
-          type: 'default',
-          range: [from, to],
-        }
-      }
-    )
-    const idBasedSelections = codeBasedSelections
-      .map(({ type, range }) => {
-        const hasOverlap = Object.entries(sourceRangeMap).filter(
-          ([_, sourceRange]) => {
-            return isOverlap(sourceRange, range)
-          }
-        )
-        if (hasOverlap.length) {
-          return {
-            type,
-            id: hasOverlap[0][0],
-          }
-        }
-      })
-      .filter(Boolean) as any
-
-    engineCommandManager?.cusorsSelected({
-      otherSelections: [],
-      idBasedSelections,
-    })
-
-    setSelectionRanges({
-      otherSelections: [],
-      codeBasedSelections,
-    })
-  }
-  const pixelDensity = window.devicePixelRatio
  const streamWidth = streamRef?.current?.offsetWidth
  const streamHeight = streamRef?.current?.offsetHeight

-  const width = streamWidth ? streamWidth * pixelDensity : 0
+  const width = streamWidth ? streamWidth : 0
  const quadWidth = Math.round(width / 4) * 4
-  const height = streamHeight ? streamHeight * pixelDensity : 0
+  const height = streamHeight ? streamHeight : 0
  const quadHeight = Math.round(height / 4) * 4

  useLayoutEffect(() => {
@ -278,21 +176,21 @@ export function App() {

  useEffect(() => {
    if (!isStreamReady) return
+    if (!engineCommandManager) return
+    let unsubFn: any[] = []
    const asyncWrap = async () => {
      try {
-        if (!code) {
+        if (!defferedCode) {
          setAst(null)
          return
        }
-        const _ast = await asyncParser(code)
+        const _ast = await asyncParser(defferedCode)
        setAst(_ast)
        resetLogs()
        resetKCLErrors()
-        if (engineCommandManager) {
-          engineCommandManager.endSession()
-          engineCommandManager.startNewSession()
-        }
-        if (!engineCommandManager) return
+        engineCommandManager.endSession()
+        engineCommandManager.startNewSession()
+        setIsExecuting(true)
        const programMemory = await _executor(
          _ast,
          {
@ -324,30 +222,42 @@ export function App() {

        const { artifactMap, sourceRangeMap } =
          await engineCommandManager.waitForAllCommands()
+        setIsExecuting(false)

        setArtifactMap({ artifactMap, sourceRangeMap })
-        engineCommandManager.onHover((id) => {
-          if (!id) {
-            setHighlightRange([0, 0])
-          } else {
-            const sourceRange = sourceRangeMap[id]
-            setHighlightRange(sourceRange)
-          }
+        const unSubHover = engineCommandManager.subscribeToUnreliable({
+          event: 'highlight_set_entity',
+          callback: ({ data }) => {
+            if (data?.entity_id) {
+              const sourceRange = sourceRangeMap[data.entity_id]
+              setHighlightRange(sourceRange)
+            } else if (
+              !highlightRange ||
+              (highlightRange[0] !== 0 && highlightRange[1] !== 0)
+            ) {
+              setHighlightRange([0, 0])
+            }
+          },
        })
-        engineCommandManager.onClick((selections) => {
-          if (!selections) {
-            setCursor2()
-            return
-          }
-          const { id, type } = selections
-          setCursor2({ range: sourceRangeMap[id], type })
+        const unSubClick = engineCommandManager.subscribeTo({
+          event: 'select_with_point',
+          callback: ({ data }) => {
+            if (!data?.entity_id) {
+              setCursor2()
+              return
+            }
+            const sourceRange = sourceRangeMap[data.entity_id]
+            setCursor2({ range: sourceRange, type: 'default' })
+          },
        })
+        unsubFn.push(unSubHover, unSubClick)
        if (programMemory !== undefined) {
          setProgramMemory(programMemory)
        }

        setError()
      } catch (e: any) {
+        setIsExecuting(false)
        if (e instanceof KCLError) {
          addKCLError(e)
        } else {
@ -358,37 +268,41 @@ export function App() {
      }
    }
    asyncWrap()
-  }, [code, isStreamReady])
+    return () => {
+      unsubFn.forEach((fn) => fn())
+    }
+  }, [defferedCode, isStreamReady, engineCommandManager])

  const debounceSocketSend = throttle<EngineCommand>((message) => {
    engineCommandManager?.sendSceneCommand(message)
  }, 16)
-  const handleMouseMove: MouseEventHandler<HTMLDivElement> = ({
-    clientX,
-    clientY,
-    ctrlKey,
-    shiftKey,
-    currentTarget,
-    nativeEvent,
-  }) => {
-    nativeEvent.preventDefault()
-    if (isMouseDownInStream) {
-      setDidDragInStream(true)
-    }
+  const handleMouseMove: MouseEventHandler<HTMLDivElement> = (e) => {
+    e.nativeEvent.preventDefault()

    const { x, y } = getNormalisedCoordinates({
-      clientX,
-      clientY,
-      el: currentTarget,
+      clientX: e.clientX,
+      clientY: e.clientY,
+      el: e.currentTarget,
      ...streamDimensions,
    })

-    const interaction = ctrlKey ? 'zoom' : shiftKey ? 'pan' : 'rotate'
-
    const newCmdId = uuidv4()
-    setCmdId(newCmdId)

-    if (cmdId && isMouseDownInStream) {
+    if (buttonDownInStream) {
+      const interactionGuards = cameraMouseDragGuards[cameraControls]
+      let interaction: CameraDragInteractionType_type
+
+      const eWithButton = { ...e, button: buttonDownInStream }
+
+      if (interactionGuards.pan.callback(eWithButton)) {
+        interaction = 'pan'
+      } else if (interactionGuards.rotate.callback(eWithButton)) {
+        interaction = 'rotate'
+      } else if (interactionGuards.zoom.dragCallback(eWithButton)) {
+        interaction = 'zoom'
+      } else {
+        return
+      }
      debounceSocketSend({
        type: 'modeling_cmd_req',
        cmd: {
@ -410,16 +324,6 @@ export function App() {
    }
  }

-  const extraExtensions = useMemo(() => {
-    if (TEST) return []
-    return [
-      lintGutter(),
-      linter((_view) => {
-        return kclErrToDiagnostic(useStore.getState().kclErrors)
-      }),
-    ]
-  }, [])
-
  return (
    <div
      className="h-screen overflow-hidden relative flex flex-col cursor-pointer select-none"
@ -430,7 +334,7 @@ export function App() {
        className={
          'transition-opacity transition-duration-75 ' +
          paneOpacity +
-          (isMouseDownInStream ? ' pointer-events-none' : '')
+          (buttonDownInStream ? ' pointer-events-none' : '')
        }
        project={project}
        enableMenu={true}
@ -439,7 +343,7 @@ export function App() {
      <Resizable
        className={
          'h-full flex flex-col flex-1 z-10 my-5 ml-5 pr-1 transition-opacity transition-duration-75 ' +
-          (isMouseDownInStream || onboardingStatus === 'camera'
+          (buttonDownInStream || onboardingStatus === 'camera'
            ? ' pointer-events-none '
            : ' ') +
          paneOpacity
@ -463,31 +367,9 @@ export function App() {
            icon={faCode}
            className="open:!mb-2"
            open={openPanes.includes('code')}
+            menu={<CodeMenu />}
          >
-            <div className="px-2 py-1">
-              <button
-                // disabled={!shouldFormat}
-                onClick={formatCode}
-                // className={`${!shouldFormat && 'text-gray-300'}`}
-              >
-                format
-              </button>
-            </div>
-            <div id="code-mirror-override">
-              <CodeMirror
-                className="h-full"
-                value={code}
-                extensions={[
-                  langs.javascript({ jsx: true }),
-                  lineHighlightField,
-                  ...extraExtensions,
-                ]}
-                onChange={onChange}
-                onUpdate={onUpdate}
-                theme={editorTheme}
-                onCreateEditor={(_editorView) => setEditorView(_editorView)}
-              />
-            </div>
+            <TextEditor theme={editorTheme} />
          </CollapsiblePanel>
          <section className="flex flex-col">
            <MemoryPanel
@ -518,7 +400,7 @@ export function App() {
          className={
            'transition-opacity transition-duration-75 ' +
            paneOpacity +
-            (isMouseDownInStream ? ' pointer-events-none' : '')
+            (buttonDownInStream ? ' pointer-events-none' : '')
          }
          open={openPanes.includes('debug')}
        />
--- a/src/Router.tsx
+++ b/src/Router.tsx
@ -3,8 +3,15 @@ import {
  createBrowserRouter,
  Outlet,
  redirect,
+  useLocation,
  RouterProvider,
 } from 'react-router-dom'
+import {
+  matchRoutes,
+  createRoutesFromChildren,
+  useNavigationType,
+} from 'react-router'
+import { useEffect } from 'react'
 import { ErrorPage } from './components/ErrorPage'
 import { Settings } from './routes/Settings'
 import Onboarding, {
@ -31,6 +38,40 @@ import {
 } from './machines/settingsMachine'
 import { ContextFrom } from 'xstate'
 import CommandBarProvider from 'components/CommandBar'
+import { TEST, VITE_KC_SENTRY_DSN } from './env'
+import * as Sentry from '@sentry/react'
+
+if (VITE_KC_SENTRY_DSN && !TEST) {
+  Sentry.init({
+    dsn: VITE_KC_SENTRY_DSN,
+    // TODO(paultag): pass in the right env here.
+    // environment: "production",
+    integrations: [
+      new Sentry.BrowserTracing({
+        routingInstrumentation: Sentry.reactRouterV6Instrumentation(
+          useEffect,
+          useLocation,
+          useNavigationType,
+          createRoutesFromChildren,
+          matchRoutes
+        ),
+      }),
+      new Sentry.Replay(),
+    ],
+
+    // Set tracesSampleRate to 1.0 to capture 100%
+    // of transactions for performance monitoring.
+    tracesSampleRate: 1.0,
+
+    // TODO: Add in kittycad.io endpoints
+    tracePropagationTargets: ['localhost'],
+
+    // Capture Replay for 10% of all sessions,
+    // plus for 100% of sessions with an error
+    replaysSessionSampleRate: 0.1,
+    replaysOnErrorSampleRate: 1.0,
+  })
+}

 const prependRoutes =
  (routesObject: Record<string, string>) => (prepend: string) => {
@ -121,7 +162,9 @@ const router = createBrowserRouter(
          notEnRouteToOnboarding && hasValidOnboardingStatus

        if (shouldRedirectToOnboarding) {
-          return redirect(makeUrlPathRelative(paths.ONBOARDING.INDEX) + status)
+          return redirect(
+            makeUrlPathRelative(paths.ONBOARDING.INDEX) + status.slice(1)
+          )
        }

        if (params.id && params.id !== 'new') {
--- a/src/Toolbar.module.css
+++ b/src/Toolbar.module.css
@ -0,0 +1,60 @@
+.toolbarWrapper {
+  @apply relative;
+}
+
+.toolbar {
+  @apply flex gap-4 items-center rounded-full;
+  @apply border border-cool-20/30 bg-cool-10/50;
+}
+
+:global(.dark) .toolbar {
+  @apply border-cool-100/50 bg-cool-120/50;
+}
+
+:global(.sketch) .toolbar {
+  @apply border-fern-20/20 bg-fern-10/20;
+}
+
+:global(.dark .sketch) .toolbar {
+  @apply border-fern-120/50 bg-fern-100/30;
+}
+
+.toolbarCap {
+  @apply text-sm font-bold;
+  @apply bg-cool-20/50 text-cool-100;
+}
+
+:global(.dark) .toolbarCap {
+  @apply bg-cool-90/50 text-cool-30;
+}
+
+:global(.sketch) .toolbarCap {
+  @apply bg-fern-20/50 text-fern-100;
+}
+
+:global(.dark .sketch) .toolbarCap {
+  @apply bg-fern-90/50 text-fern-30;
+}
+
+.label {
+  @apply self-stretch flex items-center px-4 py-1;
+  @apply rounded-l-full;
+}
+
+.popoverToggle {
+  @apply self-stretch m-0 flex items-center px-4 py-1;
+  @apply rounded-r-full border-none;
+  @apply hover:bg-cool-20;
+}
+
+:global(.dark) .popoverToggle {
+  @apply hover:bg-cool-90;
+}
+
+:global(.sketch) .popoverToggle {
+  @apply hover:bg-fern-20;
+}
+
+:global(.dark .sketch) .popoverToggle {
+  @apply hover:bg-fern-90;
+}
--- a/src/Toolbar.tsx
+++ b/src/Toolbar.tsx
@ -8,9 +8,13 @@ import { EqualAngle } from './components/Toolbar/EqualAngle'
 import { Intersect } from './components/Toolbar/Intersect'
 import { SetHorzVertDistance } from './components/Toolbar/SetHorzVertDistance'
 import { SetAngleLength } from './components/Toolbar/setAngleLength'
-import { ConvertToVariable } from './components/Toolbar/ConvertVariable'
 import { SetAbsDistance } from './components/Toolbar/SetAbsDistance'
 import { SetAngleBetween } from './components/Toolbar/SetAngleBetween'
+import { Fragment, useEffect } from 'react'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faSearch, faX } from '@fortawesome/free-solid-svg-icons'
+import { Popover, Transition } from '@headlessui/react'
+import styles from './Toolbar.module.css'

 export const Toolbar = () => {
  const {
@ -29,72 +33,26 @@ export const Toolbar = () => {
    programMemory: s.programMemory,
  }))

-  return (
-    <div>
-      {guiMode.mode === 'default' && (
-        <button
-          onClick={() => {
-            setGuiMode({
-              mode: 'sketch',
-              sketchMode: 'selectFace',
-            })
-          }}
-        >
-          Start Sketch
-        </button>
-      )}
-      {guiMode.mode === 'canEditExtrude' && (
-        <button
-          onClick={() => {
-            if (!ast) return
-            const pathToNode = getNodePathFromSourceRange(
-              ast,
-              selectionRanges.codeBasedSelections[0].range
-            )
-            const { modifiedAst } = sketchOnExtrudedFace(
-              ast,
-              pathToNode,
-              programMemory
-            )
-            updateAst(modifiedAst)
-          }}
-        >
-          SketchOnFace
-        </button>
-      )}
-      {(guiMode.mode === 'canEditSketch' || false) && (
-        <button
-          onClick={() => {
-            setGuiMode({
-              mode: 'sketch',
-              sketchMode: 'sketchEdit',
-              pathToNode: guiMode.pathToNode,
-              rotation: guiMode.rotation,
-              position: guiMode.position,
-            })
-          }}
-        >
-          Edit Sketch
-        </button>
-      )}
-      {guiMode.mode === 'canEditSketch' && (
-        <>
+  useEffect(() => {
+    console.log('guiMode', guiMode)
+  }, [guiMode])
+
+  function ToolbarButtons() {
+    return (
+      <>
+        {guiMode.mode === 'default' && (
          <button
            onClick={() => {
-              if (!ast) return
-              const pathToNode = getNodePathFromSourceRange(
-                ast,
-                selectionRanges.codeBasedSelections[0].range
-              )
-              const { modifiedAst, pathToExtrudeArg } = extrudeSketch(
-                ast,
-                pathToNode
-              )
-              updateAst(modifiedAst, { focusPath: pathToExtrudeArg })
+              setGuiMode({
+                mode: 'sketch',
+                sketchMode: 'selectFace',
+              })
            }}
          >
-            ExtrudeSketch
+            Start Sketch
          </button>
+        )}
+        {guiMode.mode === 'canEditExtrude' && (
          <button
            onClick={() => {
              if (!ast) return
@ -102,77 +60,181 @@ export const Toolbar = () => {
                ast,
                selectionRanges.codeBasedSelections[0].range
              )
-              const { modifiedAst, pathToExtrudeArg } = extrudeSketch(
+              const { modifiedAst } = sketchOnExtrudedFace(
                ast,
                pathToNode,
-                false
+                programMemory
              )
-              updateAst(modifiedAst, { focusPath: pathToExtrudeArg })
+              updateAst(modifiedAst)
            }}
          >
-            ExtrudeSketch (w/o pipe)
+            SketchOnFace
          </button>
-        </>
-      )}
-
-      {guiMode.mode === 'sketch' && (
-        <button onClick={() => setGuiMode({ mode: 'default' })}>
-          Exit sketch
-        </button>
-      )}
-      {toolTips
-        .filter(
-          // (sketchFnName) => !['angledLineThatIntersects'].includes(sketchFnName)
-          (sketchFnName) => ['line'].includes(sketchFnName)
-        )
-        .map((sketchFnName) => {
-          if (
-            guiMode.mode !== 'sketch' ||
-            !('isTooltip' in guiMode || guiMode.sketchMode === 'sketchEdit')
-          )
-            return null
-          return (
+        )}
+        {(guiMode.mode === 'canEditSketch' || false) && (
+          <button
+            onClick={() => {
+              setGuiMode({
+                mode: 'sketch',
+                sketchMode: 'sketchEdit',
+                pathToNode: guiMode.pathToNode,
+                rotation: guiMode.rotation,
+                position: guiMode.position,
+              })
+            }}
+          >
+            Edit Sketch
+          </button>
+        )}
+        {guiMode.mode === 'canEditSketch' && (
+          <>
            <button
-              key={sketchFnName}
-              onClick={() =>
-                setGuiMode({
-                  ...guiMode,
-                  ...(guiMode.sketchMode === sketchFnName
-                    ? {
-                        sketchMode: 'sketchEdit',
-                        // todo: ...guiMod is adding isTooltip: true, will probably just fix with xstate migtaion
-                      }
-                    : {
-                        sketchMode: sketchFnName,
-                        isTooltip: true,
-                      }),
-                })
-              }
+              onClick={() => {
+                if (!ast) return
+                const pathToNode = getNodePathFromSourceRange(
+                  ast,
+                  selectionRanges.codeBasedSelections[0].range
+                )
+                const { modifiedAst, pathToExtrudeArg } = extrudeSketch(
+                  ast,
+                  pathToNode
+                )
+                updateAst(modifiedAst, { focusPath: pathToExtrudeArg })
+              }}
            >
-              {sketchFnName}
-              {guiMode.sketchMode === sketchFnName && '✅'}
+              ExtrudeSketch
            </button>
+            <button
+              onClick={() => {
+                if (!ast) return
+                const pathToNode = getNodePathFromSourceRange(
+                  ast,
+                  selectionRanges.codeBasedSelections[0].range
+                )
+                const { modifiedAst, pathToExtrudeArg } = extrudeSketch(
+                  ast,
+                  pathToNode,
+                  false
+                )
+                updateAst(modifiedAst, { focusPath: pathToExtrudeArg })
+              }}
+            >
+              ExtrudeSketch (w/o pipe)
+            </button>
+          </>
+        )}
+
+        {guiMode.mode === 'sketch' && (
+          <button onClick={() => setGuiMode({ mode: 'default' })}>
+            Exit sketch
+          </button>
+        )}
+        {toolTips
+          .filter(
+            // (sketchFnName) => !['angledLineThatIntersects'].includes(sketchFnName)
+            (sketchFnName) => ['line'].includes(sketchFnName)
          )
-        })}
-      <br></br>
-      <ConvertToVariable />
-      <HorzVert horOrVert="horizontal" />
-      <HorzVert horOrVert="vertical" />
-      <EqualLength />
-      <EqualAngle />
-      <SetHorzVertDistance buttonType="alignEndsVertically" />
-      <SetHorzVertDistance buttonType="setHorzDistance" />
-      <SetAbsDistance buttonType="snapToYAxis" />
-      <SetAbsDistance buttonType="xAbs" />
-      <SetHorzVertDistance buttonType="alignEndsHorizontally" />
-      <SetAbsDistance buttonType="snapToXAxis" />
-      <SetHorzVertDistance buttonType="setVertDistance" />
-      <SetAbsDistance buttonType="yAbs" />
-      <SetAngleLength angleOrLength="setAngle" />
-      <SetAngleLength angleOrLength="setLength" />
-      <Intersect />
-      <RemoveConstrainingValues />
-      <SetAngleBetween />
-    </div>
+          .map((sketchFnName) => {
+            if (
+              guiMode.mode !== 'sketch' ||
+              !('isTooltip' in guiMode || guiMode.sketchMode === 'sketchEdit')
+            )
+              return null
+            return (
+              <button
+                key={sketchFnName}
+                onClick={() =>
+                  setGuiMode({
+                    ...guiMode,
+                    ...(guiMode.sketchMode === sketchFnName
+                      ? {
+                          sketchMode: 'sketchEdit',
+                          // todo: ...guiMod is adding isTooltip: true, will probably just fix with xstate migtaion
+                        }
+                      : {
+                          sketchMode: sketchFnName,
+                          isTooltip: true,
+                        }),
+                  })
+                }
+              >
+                {sketchFnName}
+                {guiMode.sketchMode === sketchFnName && '✅'}
+              </button>
+            )
+          })}
+        <HorzVert horOrVert="horizontal" />
+        <HorzVert horOrVert="vertical" />
+        <EqualLength />
+        <EqualAngle />
+        <SetHorzVertDistance buttonType="alignEndsVertically" />
+        <SetHorzVertDistance buttonType="setHorzDistance" />
+        <SetAbsDistance buttonType="snapToYAxis" />
+        <SetAbsDistance buttonType="xAbs" />
+        <SetHorzVertDistance buttonType="alignEndsHorizontally" />
+        <SetAbsDistance buttonType="snapToXAxis" />
+        <SetHorzVertDistance buttonType="setVertDistance" />
+        <SetAbsDistance buttonType="yAbs" />
+        <SetAngleLength angleOrLength="setAngle" />
+        <SetAngleLength angleOrLength="setLength" />
+        <Intersect />
+        <RemoveConstrainingValues />
+        <SetAngleBetween />
+      </>
+    )
+  }
+
+  return (
+    <Popover className={styles.toolbarWrapper + ' ' + guiMode.mode}>
+      <div className={styles.toolbar}>
+        <span className={styles.toolbarCap + ' ' + styles.label}>
+          {guiMode.mode === 'sketch' ? '2D' : '3D'}
+        </span>
+        <menu className="flex flex-1 gap-2 py-0.5 overflow-hidden whitespace-nowrap">
+          <ToolbarButtons />
+        </menu>
+        <Popover.Button
+          className={styles.toolbarCap + ' ' + styles.popoverToggle}
+        >
+          <FontAwesomeIcon icon={faSearch} />
+        </Popover.Button>
+      </div>
+      <Transition
+        as={Fragment}
+        enter="transition ease-out duration-200"
+        enterFrom="opacity-0"
+        enterTo="opacity-100"
+        leave="transition ease-out duration-100"
+        leaveFrom="opacity-100"
+        leaveTo="opacity-0"
+      >
+        <Popover.Overlay className="fixed inset-0 bg-chalkboard-110/20 dark:bg-chalkboard-110/50" />
+      </Transition>
+      <Transition
+        as={Fragment}
+        enter="transition ease-out duration-100"
+        enterFrom="opacity-0 translate-y-1 scale-95"
+        enterTo="opacity-100 translate-y-0 scale-100"
+        leave="transition ease-out duration-75"
+        leaveFrom="opacity-100 translate-y-0"
+        leaveTo="opacity-0 translate-y-2"
+      >
+        <Popover.Panel className="absolute top-0 w-screen max-w-xl left-1/2 -translate-x-1/2 flex flex-col gap-8 bg-chalkboard-10 dark:bg-chalkboard-100 p-5 rounded border border-chalkboard-20/30 dark:border-chalkboard-70/50">
+          <section className="flex justify-between items-center">
+            <p
+              className={`${styles.toolbarCap} ${styles.label} !self-center rounded-r-full w-fit`}
+            >
+              You're in {guiMode.mode === 'sketch' ? '2D' : '3D'}
+            </p>
+            <Popover.Button className="p-2 flex items-center justify-center rounded-sm bg-chalkboard-20 text-chalkboard-110 dark:bg-chalkboard-70 dark:text-chalkboard-20 border-none hover:bg-chalkboard-30 dark:hover:bg-chalkboard-60">
+              <FontAwesomeIcon icon={faX} className="w-4 h-4" />
+            </Popover.Button>
+          </section>
+          <section>
+            <ToolbarButtons />
+          </section>
+        </Popover.Panel>
+      </Transition>
+    </Popover>
  )
 }
--- a/src/components/AppHeader.module.css
+++ b/src/components/AppHeader.module.css
@ -0,0 +1,7 @@
+/*
+  Some CSS cannot be represented
+  in Tailwind, such as complex grid layouts.
+ */
+.header {
+  grid-template-columns: 1fr auto 1fr;
+}
--- a/src/components/AppHeader.tsx
+++ b/src/components/AppHeader.tsx
@ -3,6 +3,7 @@ import UserSidebarMenu from './UserSidebarMenu'
 import { ProjectWithEntryPointMetadata } from '../Router'
 import ProjectSidebarMenu from './ProjectSidebarMenu'
 import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
+import styles from './AppHeader.module.css'

 interface AppHeaderProps extends React.PropsWithChildren {
  showToolbar?: boolean
@ -27,7 +28,9 @@ export const AppHeader = ({
  return (
    <header
      className={
-        'overlaid-panes sticky top-0 z-20 py-1 px-5 bg-chalkboard-10/50 dark:bg-chalkboard-100/50 border-b dark:border-b-2 border-chalkboard-30 dark:border-chalkboard-90 flex justify-between items-center ' +
+        (showToolbar ? 'grid ' : 'flex justify-between ') +
+        styles.header +
+        ' overlaid-panes sticky top-0 z-20 py-1 px-5 bg-chalkboard-10/70 dark:bg-chalkboard-100/50 border-b dark:border-b-2 border-chalkboard-30 dark:border-chalkboard-90 items-center ' +
        className
      }
    >
@ -39,7 +42,11 @@ export const AppHeader = ({
        </div>
      )}
      {/* If there are children, show them, otherwise show User menu */}
-      {children || <UserSidebarMenu user={user} />}
+      {children || (
+        <div className="ml-auto">
+          <UserSidebarMenu user={user} />
+        </div>
+      )}
    </header>
  )
 }
--- a/src/components/AvailableVarsHelpers.tsx
+++ b/src/components/AvailableVarsHelpers.tsx
@ -198,29 +198,25 @@ export const CreateNewVariable = ({
  isNewVariableNameUnique,
  setNewVariableName,
  shouldCreateVariable,
-  setShouldCreateVariable,
+  setShouldCreateVariable = () => {},
  showCheckbox = true,
 }: {
  isNewVariableNameUnique: boolean
  newVariableName: string
  setNewVariableName: (a: string) => void
-  shouldCreateVariable: boolean
-  setShouldCreateVariable: (a: boolean) => void
+  shouldCreateVariable?: boolean
+  setShouldCreateVariable?: (a: boolean) => void
  showCheckbox?: boolean
 }) => {
  return (
    <>
-      <label
-        htmlFor="create-new-variable"
-        className="block text-sm font-medium text-gray-700 mt-3 font-mono"
-      >
+      <label htmlFor="create-new-variable" className="block mt-3 font-mono">
        Create new variable
      </label>
-      <div className="mt-1 flex flex-1">
+      <div className="mt-1 flex gap-2 items-center">
        {showCheckbox && (
          <input
            type="checkbox"
-            className="shadow-sm focus:ring-blue-500 focus:border-blue-500 block w-full sm:text-sm border-gray-300 rounded-md font-mono pl-1 flex-shrink"
            checked={shouldCreateVariable}
            onChange={(e) => {
              setShouldCreateVariable(e.target.checked)
@ -232,7 +228,10 @@ export const CreateNewVariable = ({
          disabled={!shouldCreateVariable}
          name="create-new-variable"
          id="create-new-variable"
-          className={`shadow-sm font-[monospace] focus:ring-blue-500 focus:border-blue-500 block w-full sm:text-sm border-gray-300 rounded-md font-mono pl-1 flex-shrink-0 ${
+          autoFocus={true}
+          autoCapitalize="off"
+          autoCorrect="off"
+          className={`font-mono flex-1 sm:text-sm px-2 py-1 rounded-sm bg-chalkboard-10 dark:bg-chalkboard-90 text-chalkboard-90 dark:text-chalkboard-10 ${
            !shouldCreateVariable ? 'opacity-50' : ''
          }`}
          value={newVariableName}
--- a/src/components/CodeMenu.module.css
+++ b/src/components/CodeMenu.module.css
@ -0,0 +1,19 @@
+.button {
+  @apply flex justify-between items-center gap-2 px-2 py-1 text-left border-none rounded-sm;
+  @apply font-mono text-xs font-bold select-none text-chalkboard-90;
+  @apply ui-active:bg-liquid-10/50 ui-active:text-liquid-90;
+  @apply transition-colors ease-out;
+}
+
+:global(.dark) .button {
+  @apply text-chalkboard-30;
+  @apply ui-active:bg-chalkboard-80 ui-active:text-liquid-10;
+}
+
+.button small {
+  @apply text-chalkboard-60;
+}
+
+:global(.dark) .button small {
+  @apply text-chalkboard-40;
+}
--- a/src/components/CodeMenu.tsx
+++ b/src/components/CodeMenu.tsx
@ -0,0 +1,59 @@
+import { Menu } from '@headlessui/react'
+import { PropsWithChildren } from 'react'
+import { faEllipsis } from '@fortawesome/free-solid-svg-icons'
+import { ActionIcon } from './ActionIcon'
+import { useStore } from 'useStore'
+import styles from './CodeMenu.module.css'
+import { useConvertToVariable } from 'hooks/useToolbarGuards'
+import { editorShortcutMeta } from './TextEditor'
+
+export const CodeMenu = ({ children }: PropsWithChildren) => {
+  const { formatCode } = useStore((s) => ({
+    formatCode: s.formatCode,
+  }))
+  const { enable: convertToVarEnabled, handleClick: handleConvertToVarClick } =
+    useConvertToVariable()
+
+  return (
+    <Menu>
+      <div
+        className="relative"
+        onClick={(e) => {
+          if (e.eventPhase === 3) {
+            e.stopPropagation()
+            e.preventDefault()
+          }
+        }}
+      >
+        <Menu.Button className="p-0 border-none relative">
+          <ActionIcon
+            icon={faEllipsis}
+            bgClassName={
+              'bg-chalkboard-20 dark:bg-chalkboard-110 hover:bg-liquid-10/50 hover:dark:bg-chalkboard-90 ui-active:bg-chalkboard-80 ui-active:dark:bg-chalkboard-90  rounded'
+            }
+            iconClassName={'text-chalkboard-90 dark:text-chalkboard-40'}
+          />
+        </Menu.Button>
+        <Menu.Items className="absolute right-0 left-auto w-72 flex flex-col gap-1 divide-y divide-chalkboard-20 dark:divide-chalkboard-70 align-stretch px-0 py-1 bg-chalkboard-10 dark:bg-chalkboard-90 rounded-sm shadow-lg border border-solid border-chalkboard-20/50 dark:border-chalkboard-80/50">
+          <Menu.Item>
+            <button onClick={() => formatCode()} className={styles.button}>
+              <span>Format code</span>
+              <small>{editorShortcutMeta.formatCode.display}</small>
+            </button>
+          </Menu.Item>
+          {convertToVarEnabled && (
+            <Menu.Item>
+              <button
+                onClick={handleConvertToVarClick}
+                className={styles.button}
+              >
+                <span>Convert to Variable</span>
+                <small>{editorShortcutMeta.convertToVariable.display}</small>
+              </button>
+            </Menu.Item>
+          )}
+        </Menu.Items>
+      </div>
+    </Menu>
+  )
+}
--- a/src/components/CollapsiblePanel.module.css
+++ b/src/components/CollapsiblePanel.module.css
@ -1,15 +1,15 @@
 .panel {
-  @apply relative overflow-auto z-0;
-  @apply bg-chalkboard-20/40;
+  @apply relative z-0;
+  @apply bg-chalkboard-10/70 backdrop-blur-sm;
 }

 :global(.dark) .panel {
-  @apply bg-chalkboard-110/50;
+  @apply bg-chalkboard-110/50 backdrop-blur-0;
 }

 .header {
  @apply sticky top-0 z-10 cursor-pointer;
-  @apply flex items-center gap-2 w-full p-2;
+  @apply flex items-center justify-between gap-2 w-full p-2;
  @apply font-mono text-xs font-bold select-none text-chalkboard-90;
  @apply bg-chalkboard-20;
 }
--- a/src/components/CollapsiblePanel.tsx
+++ b/src/components/CollapsiblePanel.tsx
@ -8,6 +8,7 @@ export interface CollapsiblePanelProps
  title: string
  icon?: IconDefinition
  open?: boolean
+  menu?: React.ReactNode
  iconClassNames?: {
    bg?: string
    icon?: string
@ -18,21 +19,27 @@ export const PanelHeader = ({
  title,
  icon,
  iconClassNames,
+  menu,
 }: CollapsiblePanelProps) => {
  return (
    <summary className={styles.header}>
-      <ActionIcon
-        icon={icon}
-        bgClassName={
-          'bg-chalkboard-30 dark:bg-chalkboard-90 group-open:bg-chalkboard-80 rounded ' +
-          (iconClassNames?.bg || '')
-        }
-        iconClassName={
-          'text-chalkboard-90 dark:text-chalkboard-40 group-open:text-liquid-10 ' +
-          (iconClassNames?.icon || '')
-        }
-      />
-      {title}
+      <div className="flex gap-2 align-center flex-1">
+        <ActionIcon
+          icon={icon}
+          bgClassName={
+            'bg-chalkboard-30 dark:bg-chalkboard-90 group-open:bg-chalkboard-80 rounded ' +
+            (iconClassNames?.bg || '')
+          }
+          iconClassName={
+            'text-chalkboard-90 dark:text-chalkboard-40 group-open:text-liquid-10 ' +
+            (iconClassNames?.icon || '')
+          }
+        />
+        {title}
+      </div>
+      <div className="group-open:opacity-100 opacity-0 group-open:pointer-events-auto pointer-events-none">
+        {menu}
+      </div>
    </summary>
  )
 }
@ -43,6 +50,7 @@ export const CollapsiblePanel = ({
  children,
  className,
  iconClassNames,
+  menu,
  ...props
 }: CollapsiblePanelProps) => {
  return (
@ -50,7 +58,12 @@ export const CollapsiblePanel = ({
      {...props}
      className={styles.panel + ' group ' + (className || '')}
    >
-      <PanelHeader title={title} icon={icon} iconClassNames={iconClassNames} />
+      <PanelHeader
+        title={title}
+        icon={icon}
+        iconClassNames={iconClassNames}
+        menu={menu}
+      />
      {children}
    </details>
  )
--- a/src/components/CommandBar.tsx
+++ b/src/components/CommandBar.tsx
@ -196,7 +196,7 @@ const CommandBar = () => {
          setCommandBarOpen(false)
          clearState()
        }}
-        className="fixed inset-0 overflow-y-auto p-4 pt-[25vh]"
+        className="fixed inset-0 z-40 overflow-y-auto p-4 pt-[25vh]"
      >
        <Transition.Child
          enter="duration-100 ease-out"
@ -207,7 +207,7 @@ const CommandBar = () => {
          leaveTo="opacity-0"
          as={Fragment}
        >
-          <Dialog.Overlay className="fixed z-40 inset-0 bg-chalkboard-10/70 dark:bg-chalkboard-110/50" />
+          <Dialog.Overlay className="fixed inset-0 bg-chalkboard-10/70 dark:bg-chalkboard-110/50" />
        </Transition.Child>
        <Transition.Child
          enter="duration-100 ease-out"
@ -221,7 +221,7 @@ const CommandBar = () => {
          <Combobox
            value={selectedCommand}
            onChange={handleCommandSelection}
-            className="rounded relative mx-auto z-40 p-2 bg-chalkboard-10 dark:bg-chalkboard-100 border dark:border-chalkboard-70 max-w-xl w-full shadow-lg"
+            className="rounded relative mx-auto p-2 bg-chalkboard-10 dark:bg-chalkboard-100 border dark:border-chalkboard-70 max-w-xl w-full shadow-lg"
            as="div"
          >
            <div className="flex gap-2 items-center">
--- a/src/components/ExportButton.tsx
+++ b/src/components/ExportButton.tsx
@ -39,7 +39,7 @@ export const ExportButton = ({ children, className }: ExportButtonProps) => {
  const initialValues: OutputFormat = {
    type: defaultType,
    storage: 'embedded',
-    presentation: 'compact',
+    presentation: 'pretty',
  }
  const formik = useFormik({
    initialValues,
@ -83,8 +83,6 @@ export const ExportButton = ({ children, className }: ExportButtonProps) => {
    },
  })

-  const yo = formik.values
-
  return (
    <>
      <ActionButton
--- a/src/components/GlobalStateProvider.tsx
+++ b/src/components/GlobalStateProvider.tsx
@ -15,7 +15,7 @@ import {
  settingsMachine,
 } from 'machines/settingsMachine'
 import { toast } from 'react-hot-toast'
-import { setThemeClass } from 'lib/theme'
+import { setThemeClass, Themes } from 'lib/theme'
 import {
  AnyStateMachine,
  ContextFrom,
@ -87,10 +87,21 @@ export const GlobalStateProvider = ({
    commandBarMeta: settingsCommandBarMeta,
  })

-  useEffect(
-    () => setThemeClass(settingsState.context.theme),
-    [settingsState.context.theme]
-  )
+  // Listen for changes to the system theme and update the app theme accordingly
+  // This is only done if the theme setting is set to 'system'.
+  // It can't be done in XState (in an invoked callback, for example)
+  // because there doesn't seem to be a good way to listen to
+  // events outside of the machine that also depend on the machine's context
+  useEffect(() => {
+    const matcher = window.matchMedia('(prefers-color-scheme: dark)')
+    const listener = (e: MediaQueryListEvent) => {
+      if (settingsState.context.theme !== 'system') return
+      setThemeClass(e.matches ? Themes.Dark : Themes.Light)
+    }
+
+    matcher.addEventListener('change', listener)
+    return () => matcher.removeEventListener('change', listener)
+  }, [settingsState.context])

  // Auth machine setup
  const [authState, authSend] = useMachine(authMachine, {
--- a/src/components/ProjectSidebarMenu.tsx
+++ b/src/components/ProjectSidebarMenu.tsx
@ -1,10 +1,11 @@
-import { Popover } from '@headlessui/react'
+import { Popover, Transition } from '@headlessui/react'
 import { ActionButton } from './ActionButton'
 import { faHome } from '@fortawesome/free-solid-svg-icons'
 import { ProjectWithEntryPointMetadata, paths } from '../Router'
 import { isTauri } from '../lib/isTauri'
 import { Link } from 'react-router-dom'
 import { ExportButton } from './ExportButton'
+import { Fragment } from 'react'

 const ProjectSidebarMenu = ({
  project,
@ -34,7 +35,7 @@ const ProjectSidebarMenu = ({
  ) : (
    <Popover className="relative">
      <Popover.Button
-        className="border-0 px-1 pr-2 pl-0 flex items-center gap-4 focus:outline-none focus:ring-2 focus:ring-energy-50"
+        className="border-0 p-0.5 pr-2 flex items-center gap-4 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-energy-50"
        data-testid="project-sidebar-toggle"
      >
        <img
@ -46,54 +47,77 @@ const ProjectSidebarMenu = ({
          {isTauri() && project?.name ? project.name : 'KittyCAD Modeling App'}
        </span>
      </Popover.Button>
-      <Popover.Overlay className="fixed z-20 inset-0 bg-chalkboard-110/50" />
+      <Transition
+        enter="duration-200 ease-out"
+        enterFrom="opacity-0"
+        enterTo="opacity-100"
+        leave="duration-100 ease-in"
+        leaveFrom="opacity-100"
+        leaveTo="opacity-0"
+        as={Fragment}
+      >
+        <Popover.Overlay className="fixed z-20 inset-0 bg-chalkboard-110/50" />
+      </Transition>

-      <Popover.Panel className="fixed inset-0 right-auto z-30 w-64 bg-chalkboard-10 dark:bg-chalkboard-100 border border-energy-100 shadow-md rounded-r-lg overflow-hidden">
-        <div className="flex items-center gap-4 px-4 py-3 bg-energy-100">
-          <img
-            src="/kitt-8bit-winking.svg"
-            alt="KittyCAD App"
-            className="h-9 w-auto"
-          />
+      <Transition
+        enter="duration-100 ease-out"
+        enterFrom="opacity-0 -translate-x-1/4"
+        enterTo="opacity-100 translate-x-0"
+        leave="duration-75 ease-in"
+        leaveFrom="opacity-100 translate-x-0"
+        leaveTo="opacity-0 -translate-x-4"
+        as={Fragment}
+      >
+        <Popover.Panel className="fixed inset-0 right-auto z-30 w-64 bg-chalkboard-10 dark:bg-chalkboard-100 border border-energy-100 dark:border-energy-100/50 shadow-md rounded-r-lg overflow-hidden">
+          <div className="flex items-center gap-4 px-4 py-3 bg-energy-100">
+            <img
+              src="/kitt-8bit-winking.svg"
+              alt="KittyCAD App"
+              className="h-9 w-auto"
+            />

-          <div>
-            <p
-              className="m-0 text-energy-10 text-mono"
-              data-testid="projectName"
-            >
-              {project?.name ? project.name : 'KittyCAD Modeling App'}
-            </p>
-            {project?.entrypoint_metadata && (
-              <p className="m-0 text-energy-40 text-xs" data-testid="createdAt">
-                Created{' '}
-                {project?.entrypoint_metadata.createdAt.toLocaleDateString()}
+            <div>
+              <p
+                className="m-0 text-energy-10 text-mono"
+                data-testid="projectName"
+              >
+                {project?.name ? project.name : 'KittyCAD Modeling App'}
              </p>
+              {project?.entrypoint_metadata && (
+                <p
+                  className="m-0 text-energy-40 text-xs"
+                  data-testid="createdAt"
+                >
+                  Created{' '}
+                  {project?.entrypoint_metadata.createdAt.toLocaleDateString()}
+                </p>
+              )}
+            </div>
+          </div>
+          <div className="p-4 flex flex-col gap-2">
+            <ExportButton
+              className={{
+                button:
+                  'border-transparent dark:border-transparent dark:hover:border-energy-60',
+              }}
+            >
+              Export Model
+            </ExportButton>
+            {isTauri() && (
+              <ActionButton
+                Element="link"
+                to={paths.HOME}
+                icon={{
+                  icon: faHome,
+                }}
+                className="border-transparent dark:border-transparent dark:hover:border-energy-60"
+              >
+                Go to Home
+              </ActionButton>
            )}
          </div>
-        </div>
-        <div className="p-4 flex flex-col gap-2">
-          <ExportButton
-            className={{
-              button:
-                'border-transparent dark:border-transparent dark:hover:border-energy-60',
-            }}
-          >
-            Export Model
-          </ExportButton>
-          {isTauri() && (
-            <ActionButton
-              Element="link"
-              to={paths.HOME}
-              icon={{
-                icon: faHome,
-              }}
-              className="border-transparent dark:border-transparent dark:hover:border-energy-60"
-            >
-              Go to Home
-            </ActionButton>
-          )}
-        </div>
-      </Popover.Panel>
+        </Popover.Panel>
+      </Transition>
    </Popover>
  )
 }
--- a/src/components/SetVarNameModal.tsx
+++ b/src/components/SetVarNameModal.tsx
@ -1,6 +1,9 @@
 import { Dialog, Transition } from '@headlessui/react'
 import { Fragment } from 'react'
 import { useCalc, CreateNewVariable } from './AvailableVarsHelpers'
+import { ActionButton } from './ActionButton'
+import { faPlus } from '@fortawesome/free-solid-svg-icons'
+import { toast } from 'react-hot-toast'

 export const SetVarNameModal = ({
  isOpen,
@ -19,67 +22,65 @@ export const SetVarNameModal = ({

  return (
    <Transition appear show={isOpen} as={Fragment}>
-      <Dialog as="div" className="relative z-10" onClose={onReject}>
+      <Dialog
+        as="div"
+        className="fixed inset-0 z-40 overflow-y-auto p-4 pt-[25vh]"
+        onClose={onReject}
+      >
        <Transition.Child
          as={Fragment}
          enter="ease-out duration-300"
-          enterFrom="opacity-0"
-          enterTo="opacity-100"
-          leave="ease-in duration-200"
+          enterFrom="opacity-0 translate-y-4"
+          enterTo="opacity-100 translate-y-0"
+          leave="ease-in duration-75"
          leaveFrom="opacity-100"
          leaveTo="opacity-0"
        >
-          <div className="fixed inset-0 bg-black bg-opacity-25" />
+          <Dialog.Overlay className="fixed inset-0 bg-chalkboard-10/70 dark:bg-chalkboard-110/50" />
        </Transition.Child>

-        <div className="fixed inset-0 overflow-y-auto">
-          <div className="flex min-h-full items-center justify-center p-4 text-center">
-            <Transition.Child
-              as={Fragment}
-              enter="ease-out duration-300"
-              enterFrom="opacity-0 scale-95"
-              enterTo="opacity-100 scale-100"
-              leave="ease-in duration-200"
-              leaveFrom="opacity-100 scale-100"
-              leaveTo="opacity-0 scale-95"
+        <Transition.Child
+          as={Fragment}
+          enter="ease-out duration-300"
+          enterFrom="opacity-0 scale-95"
+          enterTo="opacity-100 scale-100"
+          leave="ease-in duration-200"
+          leaveFrom="opacity-100 scale-100"
+          leaveTo="opacity-0 scale-95"
+        >
+          <Dialog.Panel className="rounded relative mx-auto px-4 py-8 bg-chalkboard-10 dark:bg-chalkboard-100 border dark:border-chalkboard-70 max-w-xl w-full shadow-lg">
+            <form
+              onSubmit={(e) => {
+                e.preventDefault()
+                onResolve({
+                  variableName: newVariableName,
+                })
+                toast.success(`Added variable ${newVariableName}`)
+              }}
            >
-              <Dialog.Panel className="w-full max-w-md transform overflow-hidden rounded-2xl bg-white p-6 text-left align-middle shadow-xl transition-all">
-                <Dialog.Title
-                  as="h3"
-                  className="text-lg font-medium leading-6 text-gray-900 capitalize"
+              <CreateNewVariable
+                setNewVariableName={setNewVariableName}
+                newVariableName={newVariableName}
+                isNewVariableNameUnique={isNewVariableNameUnique}
+                shouldCreateVariable={true}
+                showCheckbox={false}
+              />
+              <div className="mt-8 flex justify-between">
+                <ActionButton
+                  Element="button"
+                  type="submit"
+                  disabled={!isNewVariableNameUnique}
+                  icon={{ icon: faPlus }}
                >
-                  Set {valueName}
-                </Dialog.Title>
-
-                <CreateNewVariable
-                  setNewVariableName={setNewVariableName}
-                  newVariableName={newVariableName}
-                  isNewVariableNameUnique={isNewVariableNameUnique}
-                  shouldCreateVariable={true}
-                  setShouldCreateVariable={() => {}}
-                />
-                <div className="mt-4">
-                  <button
-                    type="button"
-                    disabled={!isNewVariableNameUnique}
-                    className={`inline-flex justify-center rounded-md border border-transparent bg-blue-100 px-4 py-2 text-sm font-medium text-blue-900 hover:bg-blue-200 focus:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2 ${
-                      !isNewVariableNameUnique
-                        ? 'opacity-50 cursor-not-allowed'
-                        : ''
-                    }`}
-                    onClick={() =>
-                      onResolve({
-                        variableName: newVariableName,
-                      })
-                    }
-                  >
-                    Add variable
-                  </button>
-                </div>
-              </Dialog.Panel>
-            </Transition.Child>
-          </div>
-        </div>
+                  Add variable
+                </ActionButton>
+                <ActionButton Element="button" onClick={() => onReject(false)}>
+                  Cancel
+                </ActionButton>
+              </div>
+            </form>
+          </Dialog.Panel>
+        </Transition.Child>
      </Dialog>
    </Transition>
  )
--- a/src/components/Stream.tsx
+++ b/src/components/Stream.tsx
@ -9,29 +9,37 @@ import { v4 as uuidv4 } from 'uuid'
 import { useStore } from '../useStore'
 import { getNormalisedCoordinates } from '../lib/utils'
 import Loading from './Loading'
+import { cameraMouseDragGuards } from 'lib/cameraControls'
+import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
+import { CameraDragInteractionType_type } from '@kittycad/lib/dist/types/src/models'

 export const Stream = ({ className = '' }) => {
  const [isLoading, setIsLoading] = useState(true)
+  const [clickCoords, setClickCoords] = useState<{ x: number; y: number }>()
  const videoRef = useRef<HTMLVideoElement>(null)
  const {
    mediaStream,
    engineCommandManager,
-    setIsMouseDownInStream,
-    setCmdId,
+    setButtonDownInStream,
    didDragInStream,
    setDidDragInStream,
    streamDimensions,
+    isExecuting,
  } = useStore((s) => ({
    mediaStream: s.mediaStream,
    engineCommandManager: s.engineCommandManager,
-    isMouseDownInStream: s.isMouseDownInStream,
-    setIsMouseDownInStream: s.setIsMouseDownInStream,
+    setButtonDownInStream: s.setButtonDownInStream,
    fileId: s.fileId,
-    setCmdId: s.setCmdId,
    didDragInStream: s.didDragInStream,
    setDidDragInStream: s.setDidDragInStream,
    streamDimensions: s.streamDimensions,
+    isExecuting: s.isExecuting,
  }))
+  const {
+    settings: {
+      context: { cameraControls },
+    },
+  } = useGlobalStateContext()

  useEffect(() => {
    if (
@ -44,24 +52,29 @@ export const Stream = ({ className = '' }) => {
    videoRef.current.srcObject = mediaStream
  }, [mediaStream, engineCommandManager])

-  const handleMouseDown: MouseEventHandler<HTMLVideoElement> = ({
-    clientX,
-    clientY,
-    ctrlKey,
-  }) => {
+  const handleMouseDown: MouseEventHandler<HTMLVideoElement> = (e) => {
    if (!videoRef.current) return
    const { x, y } = getNormalisedCoordinates({
-      clientX,
-      clientY,
+      clientX: e.clientX,
+      clientY: e.clientY,
      el: videoRef.current,
      ...streamDimensions,
    })
-    console.log('click', x, y)

    const newId = uuidv4()
-    setCmdId(newId)

-    const interaction = ctrlKey ? 'pan' : 'rotate'
+    const interactionGuards = cameraMouseDragGuards[cameraControls]
+    let interaction: CameraDragInteractionType_type
+
+    if (interactionGuards.pan.callback(e)) {
+      interaction = 'pan'
+    } else if (interactionGuards.rotate.callback(e)) {
+      interaction = 'rotate'
+    } else if (interactionGuards.zoom.dragCallback(e)) {
+      interaction = 'zoom'
+    } else {
+      return
+    }

    engineCommandManager?.sendSceneCommand({
      type: 'modeling_cmd_req',
@ -73,10 +86,13 @@ export const Stream = ({ className = '' }) => {
      cmd_id: newId,
    })

-    setIsMouseDownInStream(true)
+    setButtonDownInStream(e.button)
+    setClickCoords({ x, y })
  }

  const handleScroll: WheelEventHandler<HTMLVideoElement> = (e) => {
+    if (!cameraMouseDragGuards[cameraControls].zoom.scrollCallback(e)) return
+
    e.preventDefault()
    engineCommandManager?.sendSceneCommand({
      type: 'modeling_cmd_req',
@ -114,7 +130,7 @@ export const Stream = ({ className = '' }) => {
      cmd_id: newCmdId,
    })

-    setIsMouseDownInStream(false)
+    setButtonDownInStream(0)
    if (!didDragInStream) {
      engineCommandManager?.sendSceneCommand({
        type: 'modeling_cmd_req',
@ -127,6 +143,19 @@ export const Stream = ({ className = '' }) => {
      })
    }
    setDidDragInStream(false)
+    setClickCoords(undefined)
+  }
+
+  const handleMouseMove: MouseEventHandler<HTMLVideoElement> = (e) => {
+    if (!clickCoords) return
+
+    const delta =
+      ((clickCoords.x - e.clientX) ** 2 + (clickCoords.y - e.clientY) ** 2) **
+      0.5
+
+    if (delta > 5 && !didDragInStream) {
+      setDidDragInStream(true)
+    }
  }

  return (
@ -142,7 +171,9 @@ export const Stream = ({ className = '' }) => {
        onContextMenuCapture={(e) => e.preventDefault()}
        onWheel={handleScroll}
        onPlay={() => setIsLoading(false)}
-        className="w-full h-full"
+        onMouseMoveCapture={handleMouseMove}
+        className={`w-full h-full ${isExecuting && 'blur-md'}`}
+        style={{ transitionDuration: '200ms', transitionProperty: 'filter' }}
      />
      {isLoading && (
        <div className="text-center absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2">
--- a/src/components/TextEditor.tsx
+++ b/src/components/TextEditor.tsx
@ -0,0 +1,267 @@
+import ReactCodeMirror, {
+  Extension,
+  ViewUpdate,
+  keymap,
+} from '@uiw/react-codemirror'
+import { FromServer, IntoServer } from 'editor/lsp/codec'
+import Server from '../editor/lsp/server'
+import Client from '../editor/lsp/client'
+import { TEST } from 'env'
+import { useCommandsContext } from 'hooks/useCommandsContext'
+import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
+import { useConvertToVariable } from 'hooks/useToolbarGuards'
+import { Themes } from 'lib/theme'
+import { useMemo } from 'react'
+import { linter, lintGutter } from '@codemirror/lint'
+import { Selections, useStore } from 'useStore'
+import { LanguageServerClient } from 'editor/lsp'
+import kclLanguage from 'editor/lsp/language'
+import { isTauri } from 'lib/isTauri'
+import { useParams } from 'react-router-dom'
+import { writeTextFile } from '@tauri-apps/api/fs'
+import { PROJECT_ENTRYPOINT } from 'lib/tauriFS'
+import { toast } from 'react-hot-toast'
+import {
+  EditorView,
+  addLineHighlight,
+  lineHighlightField,
+} from 'editor/highlightextension'
+import { isOverlap } from 'lib/utils'
+import { kclErrToDiagnostic } from 'lang/errors'
+import { CSSRuleObject } from 'tailwindcss/types/config'
+
+export const editorShortcutMeta = {
+  formatCode: {
+    codeMirror: 'Alt-Shift-f',
+    display: 'Alt + Shift + F',
+  },
+  convertToVariable: {
+    codeMirror: 'Ctrl-Shift-c',
+    display: 'Ctrl + Shift + C',
+  },
+}
+
+export const TextEditor = ({
+  theme,
+}: {
+  theme: Themes.Light | Themes.Dark
+}) => {
+  const pathParams = useParams()
+  const {
+    code,
+    defferedSetCode,
+    editorView,
+    engineCommandManager,
+    formatCode,
+    isLSPServerReady,
+    selectionRanges,
+    selectionRangeTypeMap,
+    setEditorView,
+    setIsLSPServerReady,
+    setSelectionRanges,
+    sourceRangeMap,
+  } = useStore((s) => ({
+    code: s.code,
+    defferedCode: s.defferedCode,
+    defferedSetCode: s.defferedSetCode,
+    editorView: s.editorView,
+    engineCommandManager: s.engineCommandManager,
+    formatCode: s.formatCode,
+    isLSPServerReady: s.isLSPServerReady,
+    selectionRanges: s.selectionRanges,
+    selectionRangeTypeMap: s.selectionRangeTypeMap,
+    setCode: s.setCode,
+    setEditorView: s.setEditorView,
+    setIsLSPServerReady: s.setIsLSPServerReady,
+    setSelectionRanges: s.setSelectionRanges,
+    sourceRangeMap: s.sourceRangeMap,
+  }))
+
+  const {
+    settings: {
+      context: { textWrapping },
+    },
+  } = useGlobalStateContext()
+  const { setCommandBarOpen } = useCommandsContext()
+  const { enable: convertEnabled, handleClick: convertCallback } =
+    useConvertToVariable()
+
+  // So this is a bit weird, we need to initialize the lsp server and client.
+  // But the server happens async so we break this into two parts.
+  // Below is the client and server promise.
+  const { lspClient } = useMemo(() => {
+    const intoServer: IntoServer = new IntoServer()
+    const fromServer: FromServer = FromServer.create()
+    const client = new Client(fromServer, intoServer)
+    if (!TEST) {
+      Server.initialize(intoServer, fromServer).then((lspServer) => {
+        lspServer.start()
+        setIsLSPServerReady(true)
+      })
+    }
+
+    const lspClient = new LanguageServerClient({ client })
+    return { lspClient }
+  }, [setIsLSPServerReady])
+
+  // Here we initialize the plugin which will start the client.
+  // When we have multi-file support the name of the file will be a dep of
+  // this use memo, as well as the directory structure, which I think is
+  // a good setup becuase it will restart the client but not the server :)
+  // We do not want to restart the server, its just wasteful.
+  const kclLSP = useMemo(() => {
+    let plugin = null
+    if (isLSPServerReady && !TEST) {
+      // Set up the lsp plugin.
+      const lsp = kclLanguage({
+        // When we have more than one file, we'll need to change this.
+        documentUri: `file:///we-just-have-one-file-for-now.kcl`,
+        workspaceFolders: null,
+        client: lspClient,
+      })
+
+      plugin = lsp
+    }
+    return plugin
+  }, [lspClient, isLSPServerReady])
+
+  // const onChange = React.useCallback((value: string, viewUpdate: ViewUpdate) => {
+  const onChange = (value: string, viewUpdate: ViewUpdate) => {
+    defferedSetCode(value)
+    if (isTauri() && pathParams.id) {
+      // Save the file to disk
+      // Note that PROJECT_ENTRYPOINT is hardcoded until we support multiple files
+      writeTextFile(pathParams.id + '/' + PROJECT_ENTRYPOINT, value).catch(
+        (err) => {
+          // TODO: add Sentry per GH issue #254 (https://github.com/KittyCAD/modeling-app/issues/254)
+          console.error('error saving file', err)
+          toast.error('Error saving file, please check file permissions')
+        }
+      )
+    }
+    if (editorView) {
+      editorView?.dispatch({ effects: addLineHighlight.of([0, 0]) })
+    }
+  } //, []);
+  const onUpdate = (viewUpdate: ViewUpdate) => {
+    if (!editorView) {
+      setEditorView(viewUpdate.view)
+    }
+    const ranges = viewUpdate.state.selection.ranges
+
+    const isChange =
+      ranges.length !== selectionRanges.codeBasedSelections.length ||
+      ranges.some(({ from, to }, i) => {
+        return (
+          from !== selectionRanges.codeBasedSelections[i].range[0] ||
+          to !== selectionRanges.codeBasedSelections[i].range[1]
+        )
+      })
+
+    if (!isChange) return
+    const codeBasedSelections: Selections['codeBasedSelections'] = ranges.map(
+      ({ from, to }) => {
+        if (selectionRangeTypeMap[to]) {
+          return {
+            type: selectionRangeTypeMap[to],
+            range: [from, to],
+          }
+        }
+        return {
+          type: 'default',
+          range: [from, to],
+        }
+      }
+    )
+    const idBasedSelections = codeBasedSelections
+      .map(({ type, range }) => {
+        const hasOverlap = Object.entries(sourceRangeMap).filter(
+          ([_, sourceRange]) => {
+            return isOverlap(sourceRange, range)
+          }
+        )
+        if (hasOverlap.length) {
+          return {
+            type,
+            id: hasOverlap[0][0],
+          }
+        }
+      })
+      .filter(Boolean) as any
+
+    engineCommandManager?.cusorsSelected({
+      otherSelections: [],
+      idBasedSelections,
+    })
+
+    setSelectionRanges({
+      otherSelections: [],
+      codeBasedSelections,
+    })
+  }
+
+  const editorExtensions = useMemo(() => {
+    const extensions = [
+      lineHighlightField,
+      keymap.of([
+        {
+          key: 'Meta-k',
+          run: () => {
+            setCommandBarOpen(true)
+            return false
+          },
+        },
+        {
+          key: editorShortcutMeta.formatCode.codeMirror,
+          run: () => {
+            formatCode()
+            return true
+          },
+        },
+        {
+          key: editorShortcutMeta.convertToVariable.codeMirror,
+          run: () => {
+            if (convertEnabled) {
+              convertCallback()
+              return true
+            }
+            return false
+          },
+        },
+      ]),
+    ] as Extension[]
+
+    if (kclLSP) extensions.push(kclLSP)
+
+    // These extensions have proven to mess with vitest
+    if (!TEST) {
+      extensions.push(
+        lintGutter(),
+        linter((_view) => {
+          return kclErrToDiagnostic(useStore.getState().kclErrors)
+        })
+      )
+      if (textWrapping === 'On') extensions.push(EditorView.lineWrapping)
+    }
+
+    return extensions
+  }, [kclLSP, textWrapping])
+
+  return (
+    <div
+      id="code-mirror-override"
+      className="full-height-subtract"
+      style={{ '--height-subtract': '4.25rem' } as CSSRuleObject}
+    >
+      <ReactCodeMirror
+        className="h-full"
+        value={code}
+        extensions={editorExtensions}
+        onChange={onChange}
+        onUpdate={onUpdate}
+        theme={theme}
+        onCreateEditor={(_editorView) => setEditorView(_editorView)}
+      />
+    </div>
+  )
+}
--- a/src/components/Toolbar/ConvertVariable.tsx
+++ b/src/components/Toolbar/ConvertVariable.tsx
@ -1,61 +0,0 @@
-import { useState, useEffect } from 'react'
-import { create } from 'react-modal-promise'
-import { useStore } from '../../useStore'
-import { isNodeSafeToReplace } from '../../lang/queryAst'
-import { SetVarNameModal } from '../SetVarNameModal'
-import { moveValueIntoNewVariable } from '../../lang/modifyAst'
-
-const getModalInfo = create(SetVarNameModal as any)
-
-export const ConvertToVariable = () => {
-  const { guiMode, selectionRanges, ast, programMemory, updateAst } = useStore(
-    (s) => ({
-      guiMode: s.guiMode,
-      ast: s.ast,
-      updateAst: s.updateAst,
-      selectionRanges: s.selectionRanges,
-      programMemory: s.programMemory,
-    })
-  )
-  const [enableAngLen, setEnableAngLen] = useState(false)
-  useEffect(() => {
-    if (!ast) return
-
-    const { isSafe, value } = isNodeSafeToReplace(
-      ast,
-      selectionRanges.codeBasedSelections?.[0]?.range || []
-    )
-    const canReplace = isSafe && value.type !== 'Identifier'
-    const isOnlyOneSelection = selectionRanges.codeBasedSelections.length === 1
-
-    const _enableHorz = canReplace && isOnlyOneSelection
-    setEnableAngLen(_enableHorz)
-  }, [guiMode, selectionRanges])
-
-  return (
-    <button
-      onClick={async () => {
-        if (!ast) return
-        try {
-          const { variableName } = await getModalInfo({
-            valueName: 'var',
-          } as any)
-
-          const { modifiedAst: _modifiedAst } = moveValueIntoNewVariable(
-            ast,
-            programMemory,
-            selectionRanges.codeBasedSelections[0].range,
-            variableName
-          )
-
-          updateAst(_modifiedAst)
-        } catch (e) {
-          console.log('e', e)
-        }
-      }}
-      disabled={!enableAngLen}
-    >
-      ConvertToVariable
-    </button>
-  )
-}
--- a/src/components/UserSidebarMenu.tsx
+++ b/src/components/UserSidebarMenu.tsx
@ -1,9 +1,9 @@
-import { Popover } from '@headlessui/react'
+import { Popover, Transition } from '@headlessui/react'
 import { ActionButton } from './ActionButton'
 import { faBars, faGear, faSignOutAlt } from '@fortawesome/free-solid-svg-icons'
 import { faGithub } from '@fortawesome/free-brands-svg-icons'
 import { useNavigate } from 'react-router-dom'
-import { useState } from 'react'
+import { Fragment, useState } from 'react'
 import { paths } from '../Router'
 import makeUrlPathRelative from '../lib/makeUrlPathRelative'
 import { Models } from '@kittycad/lib'
@ -61,82 +61,102 @@ const UserSidebarMenu = ({ user }: { user?: User }) => {
          Menu
        </ActionButton>
      )}
-      <Popover.Overlay className="fixed z-20 inset-0 bg-chalkboard-110/50" />
+      <Transition
+        enter="duration-200 ease-out"
+        enterFrom="opacity-0"
+        enterTo="opacity-100"
+        leave="duration-100 ease-in"
+        leaveFrom="opacity-100"
+        leaveTo="opacity-0"
+        as={Fragment}
+      >
+        <Popover.Overlay className="fixed z-20 inset-0 bg-chalkboard-110/50" />
+      </Transition>

-      <Popover.Panel className="fixed inset-0 left-auto z-30 w-64 bg-chalkboard-10 dark:bg-chalkboard-100 border border-liquid-100 shadow-md rounded-l-lg overflow-hidden">
-        {({ close }) => (
-          <>
-            {user && (
-              <div className="flex items-center gap-4 px-4 py-3 bg-liquid-100">
-                {user.image && !imageLoadFailed && (
-                  <div className="rounded-full shadow-inner overflow-hidden">
-                    <img
-                      src={user.image}
-                      alt={user.name || ''}
-                      className="h-8 w-8"
-                      referrerPolicy="no-referrer"
-                      onError={() => setImageLoadFailed(true)}
-                    />
-                  </div>
-                )}
-
-                <div>
-                  <p
-                    className="m-0 text-liquid-10 text-mono"
-                    data-testid="username"
-                  >
-                    {displayedName || ''}
-                  </p>
-                  {displayedName !== user.email && (
-                    <p
-                      className="m-0 text-liquid-40 text-xs"
-                      data-testid="email"
-                    >
-                      {user.email}
-                    </p>
+      <Transition
+        enter="duration-100 ease-out"
+        enterFrom="opacity-0 translate-x-1/4"
+        enterTo="opacity-100 translate-x-0"
+        leave="duration-75 ease-in"
+        leaveFrom="opacity-100 translate-x-0"
+        leaveTo="opacity-0 translate-x-4"
+        as={Fragment}
+      >
+        <Popover.Panel className="fixed inset-0 left-auto z-30 w-64 bg-chalkboard-10 dark:bg-chalkboard-100 border border-liquid-100 dark:border-liquid-100/50 shadow-md rounded-l-lg overflow-hidden">
+          {({ close }) => (
+            <>
+              {user && (
+                <div className="flex items-center gap-4 px-4 py-3 bg-liquid-100">
+                  {user.image && !imageLoadFailed && (
+                    <div className="rounded-full shadow-inner overflow-hidden">
+                      <img
+                        src={user.image}
+                        alt={user.name || ''}
+                        className="h-8 w-8"
+                        referrerPolicy="no-referrer"
+                        onError={() => setImageLoadFailed(true)}
+                      />
+                    </div>
                  )}
+
+                  <div>
+                    <p
+                      className="m-0 text-liquid-10 text-mono"
+                      data-testid="username"
+                    >
+                      {displayedName || ''}
+                    </p>
+                    {displayedName !== user.email && (
+                      <p
+                        className="m-0 text-liquid-40 text-xs"
+                        data-testid="email"
+                      >
+                        {user.email}
+                      </p>
+                    )}
+                  </div>
                </div>
+              )}
+              <div className="p-4 flex flex-col gap-2">
+                <ActionButton
+                  Element="button"
+                  icon={{ icon: faGear }}
+                  className="border-transparent dark:border-transparent dark:hover:border-liquid-60"
+                  onClick={() => {
+                    // since /settings is a nested route the sidebar doesn't close
+                    // automatically when navigating to it
+                    close()
+                    navigate(makeUrlPathRelative(paths.SETTINGS))
+                  }}
+                >
+                  Settings
+                </ActionButton>
+                <ActionButton
+                  Element="link"
+                  to="https://github.com/KittyCAD/modeling-app/discussions"
+                  icon={{ icon: faGithub }}
+                  className="border-transparent dark:border-transparent dark:hover:border-liquid-60"
+                >
+                  Request a feature
+                </ActionButton>
+                <ActionButton
+                  Element="button"
+                  onClick={() => send('Log out')}
+                  icon={{
+                    icon: faSignOutAlt,
+                    bgClassName: 'bg-destroy-80',
+                    iconClassName:
+                      'text-destroy-20 group-hover:text-destroy-10 hover:text-destroy-10',
+                  }}
+                  className="border-transparent dark:border-transparent hover:border-destroy-40 dark:hover:border-destroy-60"
+                >
+                  Sign out
+                </ActionButton>
              </div>
-            )}
-            <div className="p-4 flex flex-col gap-2">
-              <ActionButton
-                Element="button"
-                icon={{ icon: faGear }}
-                className="border-transparent dark:border-transparent dark:hover:border-liquid-60"
-                onClick={() => {
-                  // since /settings is a nested route the sidebar doesn't close
-                  // automatically when navigating to it
-                  close()
-                  navigate(makeUrlPathRelative(paths.SETTINGS))
-                }}
-              >
-                Settings
-              </ActionButton>
-              <ActionButton
-                Element="link"
-                to="https://github.com/KittyCAD/modeling-app/discussions"
-                icon={{ icon: faGithub }}
-                className="border-transparent dark:border-transparent dark:hover:border-liquid-60"
-              >
-                Request a feature
-              </ActionButton>
-              <ActionButton
-                Element="button"
-                onClick={() => send('Log out')}
-                icon={{
-                  icon: faSignOutAlt,
-                  bgClassName: 'bg-destroy-80',
-                  iconClassName:
-                    'text-destroy-20 group-hover:text-destroy-10 hover:text-destroy-10',
-                }}
-                className="border-transparent dark:border-transparent hover:border-destroy-40 dark:hover:border-destroy-60"
-              >
-                Sign out
-              </ActionButton>
-            </div>
-          </>
-        )}
-      </Popover.Panel>
+            </>
+          )}
+        </Popover.Panel>
+      </Transition>
    </Popover>
  )
 }
--- a/src/editor/lsp/client.ts
+++ b/src/editor/lsp/client.ts
@ -0,0 +1,185 @@
+import * as jsrpc from 'json-rpc-2.0'
+import * as LSP from 'vscode-languageserver-protocol'
+
+import {
+  registerServerCapability,
+  unregisterServerCapability,
+} from './server-capability-registration'
+import { Codec, FromServer, IntoServer } from './codec'
+
+const client_capabilities: LSP.ClientCapabilities = {
+  textDocument: {
+    hover: {
+      dynamicRegistration: true,
+      contentFormat: ['plaintext', 'markdown'],
+    },
+    moniker: {},
+    synchronization: {
+      dynamicRegistration: true,
+      willSave: false,
+      didSave: false,
+      willSaveWaitUntil: false,
+    },
+    completion: {
+      dynamicRegistration: true,
+      completionItem: {
+        snippetSupport: false,
+        commitCharactersSupport: true,
+        documentationFormat: ['plaintext', 'markdown'],
+        deprecatedSupport: false,
+        preselectSupport: false,
+      },
+      contextSupport: false,
+    },
+    signatureHelp: {
+      dynamicRegistration: true,
+      signatureInformation: {
+        documentationFormat: ['plaintext', 'markdown'],
+      },
+    },
+    declaration: {
+      dynamicRegistration: true,
+      linkSupport: true,
+    },
+    definition: {
+      dynamicRegistration: true,
+      linkSupport: true,
+    },
+    typeDefinition: {
+      dynamicRegistration: true,
+      linkSupport: true,
+    },
+    implementation: {
+      dynamicRegistration: true,
+      linkSupport: true,
+    },
+  },
+  workspace: {
+    didChangeConfiguration: {
+      dynamicRegistration: true,
+    },
+  },
+}
+
+export default class Client extends jsrpc.JSONRPCServerAndClient {
+  afterInitializedHooks: (() => Promise<void>)[] = []
+  #fromServer: FromServer
+  private serverCapabilities: LSP.ServerCapabilities<any> = {}
+
+  constructor(fromServer: FromServer, intoServer: IntoServer) {
+    super(
+      new jsrpc.JSONRPCServer(),
+      new jsrpc.JSONRPCClient(async (json: jsrpc.JSONRPCRequest) => {
+        const encoded = Codec.encode(json)
+        intoServer.enqueue(encoded)
+        if (null != json.id) {
+          // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+          const response = await fromServer.responses.get(json.id)!
+          this.client.receive(response as jsrpc.JSONRPCResponse)
+        }
+      })
+    )
+    this.#fromServer = fromServer
+  }
+
+  async start(): Promise<void> {
+    // process "window/logMessage": client <- server
+    this.addMethod(LSP.LogMessageNotification.type.method, (params) => {
+      const { type, message } = params as {
+        type: LSP.MessageType
+        message: string
+      }
+      let messageString = ''
+      switch (type) {
+        case LSP.MessageType.Error: {
+          messageString += '[error] '
+          break
+        }
+        case LSP.MessageType.Warning: {
+          messageString += ' [warn] '
+          break
+        }
+        case LSP.MessageType.Info: {
+          messageString += ' [info] '
+          break
+        }
+        case LSP.MessageType.Log: {
+          messageString += '  [log] '
+          break
+        }
+      }
+      messageString += message
+      // console.log(messageString)
+      return
+    })
+
+    // process "client/registerCapability": client <- server
+    this.addMethod(LSP.RegistrationRequest.type.method, (params) => {
+      // Register a server capability.
+      params.registrations.forEach(
+        (capabilityRegistration: LSP.Registration) => {
+          this.serverCapabilities = registerServerCapability(
+            this.serverCapabilities,
+            capabilityRegistration
+          )
+        }
+      )
+    })
+
+    // process "client/unregisterCapability": client <- server
+    this.addMethod(LSP.UnregistrationRequest.type.method, (params) => {
+      // Unregister a server capability.
+      params.unregisterations.forEach(
+        (capabilityUnregistration: LSP.Unregistration) => {
+          this.serverCapabilities = unregisterServerCapability(
+            this.serverCapabilities,
+            capabilityUnregistration
+          )
+        }
+      )
+    })
+
+    // request "initialize": client <-> server
+    const { capabilities } = await this.request(
+      LSP.InitializeRequest.type.method,
+      {
+        processId: null,
+        clientInfo: {
+          name: 'kcl-language-client',
+        },
+        capabilities: client_capabilities,
+        rootUri: null,
+      } as LSP.InitializeParams
+    )
+
+    this.serverCapabilities = capabilities
+
+    // notify "initialized": client --> server
+    this.notify(LSP.InitializedNotification.type.method, {})
+
+    await Promise.all(
+      this.afterInitializedHooks.map((f: () => Promise<void>) => f())
+    )
+    await Promise.all([this.processNotifications(), this.processRequests()])
+  }
+
+  getServerCapabilities(): LSP.ServerCapabilities<any> {
+    return this.serverCapabilities
+  }
+
+  async processNotifications(): Promise<void> {
+    for await (const notification of this.#fromServer.notifications) {
+      await this.receiveAndSend(notification)
+    }
+  }
+
+  async processRequests(): Promise<void> {
+    for await (const request of this.#fromServer.requests) {
+      await this.receiveAndSend(request)
+    }
+  }
+
+  pushAfterInitializeHook(...hooks: (() => Promise<void>)[]): void {
+    this.afterInitializedHooks.push(...hooks)
+  }
+}
--- a/src/editor/lsp/codec.ts
+++ b/src/editor/lsp/codec.ts
@ -0,0 +1,53 @@
+import * as jsrpc from 'json-rpc-2.0'
+import * as vsrpc from 'vscode-jsonrpc'
+
+import Bytes from './codec/bytes'
+import StreamDemuxer from './codec/demuxer'
+import Headers from './codec/headers'
+import Queue from './codec/queue'
+import Tracer from './tracer'
+
+export const encoder = new TextEncoder()
+export const decoder = new TextDecoder()
+
+export class Codec {
+  static encode(
+    json: jsrpc.JSONRPCRequest | jsrpc.JSONRPCResponse
+  ): Uint8Array {
+    const message = JSON.stringify(json)
+    const delimited = Headers.add(message)
+    return Bytes.encode(delimited)
+  }
+
+  static decode<T>(data: Uint8Array): T {
+    const delimited = Bytes.decode(data)
+    const message = Headers.remove(delimited)
+    return JSON.parse(message) as T
+  }
+}
+
+// FIXME: tracing effiency
+export class IntoServer
+  extends Queue<Uint8Array>
+  implements AsyncGenerator<Uint8Array, never, void>
+{
+  enqueue(item: Uint8Array): void {
+    Tracer.client(Headers.remove(decoder.decode(item)))
+    super.enqueue(item)
+  }
+}
+
+export interface FromServer extends WritableStream<Uint8Array> {
+  readonly responses: {
+    get(key: number | string): null | Promise<vsrpc.ResponseMessage>
+  }
+  readonly notifications: AsyncGenerator<vsrpc.NotificationMessage, never, void>
+  readonly requests: AsyncGenerator<vsrpc.RequestMessage, never, void>
+}
+
+// eslint-disable-next-line @typescript-eslint/no-namespace
+export namespace FromServer {
+  export function create(): FromServer {
+    return new StreamDemuxer()
+  }
+}
--- a/src/editor/lsp/codec/bytes.ts
+++ b/src/editor/lsp/codec/bytes.ts
@ -0,0 +1,27 @@
+import { encoder, decoder } from '../codec'
+
+export default class Bytes {
+  static encode(input: string): Uint8Array {
+    return encoder.encode(input)
+  }
+
+  static decode(input: Uint8Array): string {
+    return decoder.decode(input)
+  }
+
+  static append<
+    T extends { length: number; set(arr: T, offset: number): void }
+  >(constructor: { new (length: number): T }, ...arrays: T[]) {
+    let totalLength = 0
+    for (const arr of arrays) {
+      totalLength += arr.length
+    }
+    const result = new constructor(totalLength)
+    let offset = 0
+    for (const arr of arrays) {
+      result.set(arr, offset)
+      offset += arr.length
+    }
+    return result
+  }
+}
--- a/src/editor/lsp/codec/demuxer.ts
+++ b/src/editor/lsp/codec/demuxer.ts
@ -0,0 +1,82 @@
+import * as vsrpc from 'vscode-jsonrpc'
+
+import Bytes from './bytes'
+import PromiseMap from './map'
+import Queue from './queue'
+import Tracer from '../tracer'
+
+export default class StreamDemuxer extends Queue<Uint8Array> {
+  readonly responses: PromiseMap<number | string, vsrpc.ResponseMessage> =
+    new PromiseMap()
+  readonly notifications: Queue<vsrpc.NotificationMessage> =
+    new Queue<vsrpc.NotificationMessage>()
+  readonly requests: Queue<vsrpc.RequestMessage> =
+    new Queue<vsrpc.RequestMessage>()
+
+  readonly #start: Promise<void>
+
+  constructor() {
+    super()
+    this.#start = this.start()
+  }
+
+  private async start(): Promise<void> {
+    let contentLength: null | number = null
+    let buffer = new Uint8Array()
+
+    for await (const bytes of this) {
+      buffer = Bytes.append(Uint8Array, buffer, bytes)
+      while (buffer.length > 0) {
+        // check if the content length is known
+        if (null == contentLength) {
+          // if not, try to match the prefixed headers
+          const match = Bytes.decode(buffer).match(
+            /^Content-Length:\s*(\d+)\s*/
+          )
+          if (null == match) continue
+
+          // try to parse the content-length from the headers
+          const length = parseInt(match[1])
+          if (isNaN(length)) throw new Error('invalid content length')
+
+          // slice the headers since we now have the content length
+          buffer = buffer.slice(match[0].length)
+
+          // set the content length
+          contentLength = length
+        }
+
+        // if the buffer doesn't contain a full message; await another iteration
+        if (buffer.length < contentLength) continue
+
+        // Get just the slice of the buffer that is our content length.
+        const slice = buffer.slice(0, contentLength)
+
+        // decode buffer to a string
+        const delimited = Bytes.decode(slice)
+
+        // reset the buffer
+        buffer = buffer.slice(contentLength)
+        // reset the contentLength
+        contentLength = null
+
+        const message = JSON.parse(delimited) as vsrpc.Message
+        Tracer.server(message)
+
+        // demux the message stream
+        if (vsrpc.Message.isResponse(message) && null != message.id) {
+          this.responses.set(message.id, message)
+          continue
+        }
+        if (vsrpc.Message.isNotification(message)) {
+          this.notifications.enqueue(message)
+          continue
+        }
+        if (vsrpc.Message.isRequest(message)) {
+          this.requests.enqueue(message)
+          continue
+        }
+      }
+    }
+  }
+}
--- a/src/editor/lsp/codec/headers.ts
+++ b/src/editor/lsp/codec/headers.ts
@ -0,0 +1,9 @@
+export default class Headers {
+  static add(message: string): string {
+    return `Content-Length: ${message.length}\r\n\r\n${message}`
+  }
+
+  static remove(delimited: string): string {
+    return delimited.replace(/^Content-Length:\s*\d+\s*/, '')
+  }
+}
--- a/src/editor/lsp/codec/map.ts
+++ b/src/editor/lsp/codec/map.ts
@ -0,0 +1,72 @@
+export default class PromiseMap<K, V extends { toString(): string }> {
+  #map: Map<K, PromiseMap.Entry<V>> = new Map()
+
+  get(key: K & { toString(): string }): null | Promise<V> {
+    let initialized: PromiseMap.Entry<V>
+    // if the entry doesn't exist, set it
+    if (!this.#map.has(key)) {
+      initialized = this.#set(key)
+    } else {
+      // otherwise return the entry
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      initialized = this.#map.get(key)!
+    }
+    // if the entry is a pending promise, return it
+    if (initialized.status === 'pending') {
+      return initialized.promise
+    } else {
+      // otherwise return null
+      return null
+    }
+  }
+
+  #set(key: K, value?: V): PromiseMap.Entry<V> {
+    if (this.#map.has(key)) {
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      return this.#map.get(key)!
+    }
+    // placeholder resolver for entry
+    let resolve = (item: V) => {
+      void item
+    }
+    // promise for entry (which assigns the resolver
+    const promise = new Promise<V>((resolver) => {
+      resolve = resolver
+    })
+    // the initialized entry
+    const initialized: PromiseMap.Entry<V> = {
+      status: 'pending',
+      resolve,
+      promise,
+    }
+    if (null != value) {
+      initialized.resolve(value)
+    }
+    // set the entry
+    this.#map.set(key, initialized)
+    return initialized
+  }
+
+  set(key: K & { toString(): string }, value: V): this {
+    const initialized = this.#set(key, value)
+    // if the promise is pending ...
+    if (initialized.status === 'pending') {
+      // ... set the entry status to resolved to free the promise
+      this.#map.set(key, { status: 'resolved' })
+      // ... and resolve the promise with the given value
+      initialized.resolve(value)
+    }
+    return this
+  }
+
+  get size(): number {
+    return this.#map.size
+  }
+}
+
+// eslint-disable-next-line @typescript-eslint/no-namespace
+export namespace PromiseMap {
+  export type Entry<V> =
+    | { status: 'pending'; resolve: (item: V) => void; promise: Promise<V> }
+    | { status: 'resolved' }
+}
--- a/src/editor/lsp/codec/queue.ts
+++ b/src/editor/lsp/codec/queue.ts
@ -0,0 +1,113 @@
+export default class Queue<T>
+  implements WritableStream<T>, AsyncGenerator<T, never, void>
+{
+  readonly #promises: Promise<T>[] = []
+  readonly #resolvers: ((item: T) => void)[] = []
+  readonly #observers: ((item: T) => void)[] = []
+
+  #closed = false
+  #locked = false
+  readonly #stream: WritableStream<T>
+
+  static #__add<X>(
+    promises: Promise<X>[],
+    resolvers: ((item: X) => void)[]
+  ): void {
+    promises.push(
+      new Promise((resolve) => {
+        resolvers.push(resolve)
+      })
+    )
+  }
+
+  static #__enqueue<X>(
+    closed: boolean,
+    promises: Promise<X>[],
+    resolvers: ((item: X) => void)[],
+    item: X
+  ): void {
+    if (!closed) {
+      if (!resolvers.length) Queue.#__add(promises, resolvers)
+      const resolve = resolvers.shift()! // eslint-disable-line @typescript-eslint/no-non-null-assertion
+      resolve(item)
+    }
+  }
+
+  constructor() {
+    const closed = this.#closed
+    const promises = this.#promises
+    const resolvers = this.#resolvers
+    this.#stream = new WritableStream({
+      write(item: T): void {
+        Queue.#__enqueue(closed, promises, resolvers, item)
+      },
+    })
+  }
+
+  #add(): void {
+    return Queue.#__add(this.#promises, this.#resolvers)
+  }
+
+  enqueue(item: T): void {
+    return Queue.#__enqueue(this.#closed, this.#promises, this.#resolvers, item)
+  }
+
+  dequeue(): Promise<T> {
+    if (!this.#promises.length) this.#add()
+    const item = this.#promises.shift()! // eslint-disable-line @typescript-eslint/no-non-null-assertion
+    return item
+  }
+
+  isEmpty(): boolean {
+    return !this.#promises.length
+  }
+
+  isBlocked(): boolean {
+    return !!this.#resolvers.length
+  }
+
+  get length(): number {
+    return this.#promises.length - this.#resolvers.length
+  }
+
+  async next(): Promise<IteratorResult<T, never>> {
+    const done = false
+    const value = await this.dequeue()
+    for (const observer of this.#observers) {
+      observer(value)
+    }
+    return { done, value }
+  }
+
+  return(): Promise<IteratorResult<T, never>> {
+    return new Promise(() => {
+      // empty
+    })
+  }
+
+  throw(err: Error): Promise<IteratorResult<T, never>> {
+    return new Promise((_resolve, reject) => {
+      reject(err)
+    })
+  }
+
+  [Symbol.asyncIterator](): AsyncGenerator<T, never, void> {
+    return this
+  }
+
+  get locked(): boolean {
+    return this.#stream.locked
+  }
+
+  abort(reason?: Error): Promise<void> {
+    return this.#stream.abort(reason)
+  }
+
+  close(): Promise<void> {
+    return this.#stream.close()
+  }
+
+  getWriter(): WritableStreamDefaultWriter<T> {
+    return this.#stream.getWriter()
+  }
+}
--- a/src/editor/lsp/index.ts
+++ b/src/editor/lsp/index.ts
@ -0,0 +1,151 @@
+import type * as LSP from 'vscode-languageserver-protocol'
+import Client from './client'
+import { LanguageServerPlugin } from './plugin'
+import { SemanticToken, deserializeTokens } from './semantic_tokens'
+
+// https://microsoft.github.io/language-server-protocol/specifications/specification-current/
+
+// Client to server then server to client
+interface LSPRequestMap {
+  initialize: [LSP.InitializeParams, LSP.InitializeResult]
+  'textDocument/hover': [LSP.HoverParams, LSP.Hover]
+  'textDocument/completion': [
+    LSP.CompletionParams,
+    LSP.CompletionItem[] | LSP.CompletionList | null
+  ]
+  'textDocument/semanticTokens/full': [
+    LSP.SemanticTokensParams,
+    LSP.SemanticTokens
+  ]
+}
+
+// Client to server
+interface LSPNotifyMap {
+  initialized: LSP.InitializedParams
+  'textDocument/didChange': LSP.DidChangeTextDocumentParams
+  'textDocument/didOpen': LSP.DidOpenTextDocumentParams
+}
+
+// Server to client
+interface LSPEventMap {
+  'textDocument/publishDiagnostics': LSP.PublishDiagnosticsParams
+}
+
+export type Notification = {
+  [key in keyof LSPEventMap]: {
+    jsonrpc: '2.0'
+    id?: null | undefined
+    method: key
+    params: LSPEventMap[key]
+  }
+}[keyof LSPEventMap]
+
+export interface LanguageServerClientOptions {
+  client: Client
+}
+
+export class LanguageServerClient {
+  private client: Client
+
+  public ready: boolean
+
+  private plugins: LanguageServerPlugin[]
+
+  public initializePromise: Promise<void>
+
+  private isUpdatingSemanticTokens: boolean = false
+  private semanticTokens: SemanticToken[] = []
+
+  constructor(options: LanguageServerClientOptions) {
+    this.plugins = []
+    this.client = options.client
+
+    this.ready = false
+
+    this.initializePromise = this.initialize()
+  }
+
+  async initialize() {
+    // Start the client in the background.
+    this.client.start()
+
+    this.ready = true
+  }
+
+  getServerCapabilities(): LSP.ServerCapabilities<any> {
+    return this.client.getServerCapabilities()
+  }
+
+  close() {}
+
+  textDocumentDidOpen(params: LSP.DidOpenTextDocumentParams) {
+    this.notify('textDocument/didOpen', params)
+
+    this.updateSemanticTokens(params.textDocument.uri)
+  }
+
+  textDocumentDidChange(params: LSP.DidChangeTextDocumentParams) {
+    this.notify('textDocument/didChange', params)
+    this.updateSemanticTokens(params.textDocument.uri)
+  }
+
+  async updateSemanticTokens(uri: string) {
+    // Make sure we can only run, if we aren't already running.
+    if (!this.isUpdatingSemanticTokens) {
+      this.isUpdatingSemanticTokens = true
+
+      const result = await this.request('textDocument/semanticTokens/full', {
+        textDocument: {
+          uri,
+        },
+      })
+
+      this.semanticTokens = deserializeTokens(
+        result.data,
+        this.getServerCapabilities().semanticTokensProvider
+      )
+
+      this.isUpdatingSemanticTokens = false
+    }
+  }
+
+  getSemanticTokens(): SemanticToken[] {
+    return this.semanticTokens
+  }
+
+  async textDocumentHover(params: LSP.HoverParams) {
+    return await this.request('textDocument/hover', params)
+  }
+
+  async textDocumentCompletion(params: LSP.CompletionParams) {
+    return await this.request('textDocument/completion', params)
+  }
+
+  attachPlugin(plugin: LanguageServerPlugin) {
+    this.plugins.push(plugin)
+  }
+
+  detachPlugin(plugin: LanguageServerPlugin) {
+    const i = this.plugins.indexOf(plugin)
+    if (i === -1) return
+    this.plugins.splice(i, 1)
+  }
+
+  private request<K extends keyof LSPRequestMap>(
+    method: K,
+    params: LSPRequestMap[K][0]
+  ): Promise<LSPRequestMap[K][1]> {
+    return this.client.request(method, params) as Promise<LSPRequestMap[K][1]>
+  }
+
+  private notify<K extends keyof LSPNotifyMap>(
+    method: K,
+    params: LSPNotifyMap[K]
+  ): void {
+    return this.client.notify(method, params)
+  }
+
+  private processNotification(notification: Notification) {
+    for (const plugin of this.plugins) plugin.processNotification(notification)
+  }
+}
--- a/src/editor/lsp/language.ts
+++ b/src/editor/lsp/language.ts
@ -0,0 +1,36 @@
+// Code mirror language implementation for kcl.
+
+import {
+  Language,
+  defineLanguageFacet,
+  LanguageSupport,
+} from '@codemirror/language'
+import { LanguageServerClient } from '.'
+import { kclPlugin } from './plugin'
+import type * as LSP from 'vscode-languageserver-protocol'
+import { parser as jsParser } from '@lezer/javascript'
+
+const data = defineLanguageFacet({})
+
+export interface LanguageOptions {
+  workspaceFolders: LSP.WorkspaceFolder[] | null
+  documentUri: string
+  client: LanguageServerClient
+}
+
+export default function kclLanguage(options: LanguageOptions): LanguageSupport {
+  // For now let's use the javascript parser.
+  // It works really well and has good syntax highlighting.
+  // We can use our lsp for the rest.
+  const lang = new Language(data, jsParser, [], 'kcl')
+
+  // Create our supporting extension.
+  const kclLsp = kclPlugin({
+    documentUri: options.documentUri,
+    workspaceFolders: options.workspaceFolders,
+    allowHTMLContent: true,
+    client: options.client,
+  })
+
+  return new LanguageSupport(lang, [kclLsp])
+}
--- a/src/editor/lsp/parser.ts
+++ b/src/editor/lsp/parser.ts
@ -0,0 +1,168 @@
+// Extends the codemirror Parser for kcl.
+
+import {
+  Parser,
+  Input,
+  TreeFragment,
+  PartialParse,
+  Tree,
+  NodeType,
+  NodeSet,
+} from '@lezer/common'
+import { LanguageServerClient } from '.'
+import { posToOffset } from './plugin'
+import { SemanticToken } from './semantic_tokens'
+import { DocInput } from '@codemirror/language'
+import { tags, styleTags } from '@lezer/highlight'
+
+export default class KclParser extends Parser {
+  private client: LanguageServerClient
+
+  constructor(client: LanguageServerClient) {
+    super()
+    this.client = client
+  }
+
+  createParse(
+    input: Input,
+    fragments: readonly TreeFragment[],
+    ranges: readonly { from: number; to: number }[]
+  ): PartialParse {
+    let parse: PartialParse = new Context(this, input, fragments, ranges)
+    return parse
+  }
+
+  getTokenTypes(): string[] {
+    return this.client.getServerCapabilities().semanticTokensProvider!.legend
+      .tokenTypes
+  }
+
+  getSemanticTokens(): SemanticToken[] {
+    return this.client.getSemanticTokens()
+  }
+}
+
+class Context implements PartialParse {
+  private parser: KclParser
+  private input: DocInput
+  private fragments: readonly TreeFragment[]
+  private ranges: readonly { from: number; to: number }[]
+
+  private nodeTypes: { [key: string]: NodeType }
+  stoppedAt: number = 0
+
+  private semanticTokens: SemanticToken[] = []
+  private currentLine: number = 0
+  private currentColumn: number = 0
+  private nodeSet: NodeSet
+
+  constructor(
+    /// The parser configuration used.
+    parser: KclParser,
+    input: Input,
+    fragments: readonly TreeFragment[],
+    ranges: readonly { from: number; to: number }[]
+  ) {
+    this.parser = parser
+    this.input = input as DocInput
+    this.fragments = fragments
+    this.ranges = ranges
+
+    // Iterate over the semantic token types and create a node type for each.
+    this.nodeTypes = {}
+    let nodeArray: NodeType[] = []
+    this.parser.getTokenTypes().forEach((tokenType, index) => {
+      const nodeType = NodeType.define({
+        id: index,
+        name: tokenType,
+        // props: [this.styleTags],
+      })
+      this.nodeTypes[tokenType] = nodeType
+      nodeArray.push(nodeType)
+    })
+
+    this.semanticTokens = this.parser.getSemanticTokens()
+    const styles = styleTags({
+      number: tags.number,
+      variable: tags.variableName,
+      operator: tags.operator,
+      keyword: tags.keyword,
+      string: tags.string,
+      comment: tags.comment,
+      function: tags.function(tags.variableName),
+    })
+    this.nodeSet = new NodeSet(nodeArray).extend(styles)
+  }
+
+  get parsedPos(): number {
+    return 0
+  }
+
+  advance(): Tree | null {
+    if (this.semanticTokens.length === 0) {
+      return new Tree(NodeType.none, [], [], 0)
+    }
+    const tree = this.createTree(this.semanticTokens[0], 0)
+    this.stoppedAt = this.input.doc.length
+    return tree
+  }
+
+  createTree(token: SemanticToken, index: number): Tree {
+    const changedLine = token.delta_line !== 0
+    this.currentLine += token.delta_line
+    if (changedLine) {
+      this.currentColumn = 0
+    }
+    this.currentColumn += token.delta_start
+
+    // Let's get our position relative to the start of the file.
+    let currentPosition = posToOffset(this.input.doc, {
+      line: this.currentLine,
+      character: this.currentColumn,
+    })
+
+    const nodeType = this.nodeSet.types[this.nodeTypes[token.token_type].id]
+
+    if (currentPosition === undefined) {
+      // This is bad and weird.
+      return new Tree(nodeType, [], [], token.length)
+    }
+
+    if (index >= this.semanticTokens.length - 1) {
+      // We have no children.
+      return new Tree(nodeType, [], [], token.length)
+    }
+
+    const nextIndex = index + 1
+    const nextToken = this.semanticTokens[nextIndex]
+    const changedLineNext = nextToken.delta_line !== 0
+    const nextLine = this.currentLine + nextToken.delta_line
+    const nextColumn = changedLineNext
+      ? nextToken.delta_start
+      : this.currentColumn + nextToken.delta_start
+    const nextPosition = posToOffset(this.input.doc, {
+      line: nextLine,
+      character: nextColumn,
+    })
+
+    if (nextPosition === undefined) {
+      // This is bad and weird.
+      return new Tree(nodeType, [], [], token.length)
+    }
+
+    // Let's get the
+
+    return new Tree(
+      nodeType,
+      [this.createTree(nextToken, nextIndex)],
+
+      // The positions (offsets relative to the start of this tree) of the children.
+      [nextPosition - currentPosition],
+      token.length
+    )
+  }
+
+  stopAt(pos: number) {
+    this.stoppedAt = pos
+  }
+}
--- a/src/editor/lsp/plugin.ts
+++ b/src/editor/lsp/plugin.ts
@ -0,0 +1,360 @@
+import { autocompletion, completeFromList } from '@codemirror/autocomplete'
+import { setDiagnostics } from '@codemirror/lint'
+import { Facet } from '@codemirror/state'
+import {
+  EditorView,
+  ViewPlugin,
+  Tooltip,
+  hoverTooltip,
+  tooltips,
+} from '@codemirror/view'
+import {
+  DiagnosticSeverity,
+  CompletionItemKind,
+  CompletionTriggerKind,
+} from 'vscode-languageserver-protocol'
+
+import type {
+  Completion,
+  CompletionContext,
+  CompletionResult,
+} from '@codemirror/autocomplete'
+import type { PublishDiagnosticsParams } from 'vscode-languageserver-protocol'
+import type { ViewUpdate, PluginValue } from '@codemirror/view'
+import type { Text } from '@codemirror/state'
+import type * as LSP from 'vscode-languageserver-protocol'
+import { LanguageServerClient, Notification } from '.'
+import { Marked } from '@ts-stack/markdown'
+
+const changesDelay = 500
+
+const CompletionItemKindMap = Object.fromEntries(
+  Object.entries(CompletionItemKind).map(([key, value]) => [value, key])
+) as Record<CompletionItemKind, string>
+
+const useLast = (values: readonly any[]) => values.reduce((_, v) => v, '')
+const documentUri = Facet.define<string, string>({ combine: useLast })
+const languageId = Facet.define<string, string>({ combine: useLast })
+const client = Facet.define<LanguageServerClient, LanguageServerClient>({
+  combine: useLast,
+})
+
+export interface LanguageServerOptions {
+  workspaceFolders: LSP.WorkspaceFolder[] | null
+  documentUri: string
+  allowHTMLContent: boolean
+  client: LanguageServerClient
+}
+
+export class LanguageServerPlugin implements PluginValue {
+  public client: LanguageServerClient
+
+  private documentUri: string
+  private languageId: string
+  private documentVersion: number
+
+  private changesTimeout: number
+
+  constructor(private view: EditorView, private allowHTMLContent: boolean) {
+    this.client = this.view.state.facet(client)
+    this.documentUri = this.view.state.facet(documentUri)
+    this.languageId = this.view.state.facet(languageId)
+    this.documentVersion = 0
+    this.changesTimeout = 0
+
+    this.client.attachPlugin(this)
+
+    this.initialize({
+      documentText: this.view.state.doc.toString(),
+    })
+  }
+
+  update({ docChanged }: ViewUpdate) {
+    if (!docChanged) return
+    if (this.changesTimeout) clearTimeout(this.changesTimeout)
+    this.changesTimeout = window.setTimeout(() => {
+      this.sendChange({
+        documentText: this.view.state.doc.toString(),
+      })
+    }, changesDelay)
+  }
+
+  destroy() {
+    this.client.detachPlugin(this)
+  }
+
+  async initialize({ documentText }: { documentText: string }) {
+    if (this.client.initializePromise) {
+      await this.client.initializePromise
+    }
+    this.client.textDocumentDidOpen({
+      textDocument: {
+        uri: this.documentUri,
+        languageId: this.languageId,
+        text: documentText,
+        version: this.documentVersion,
+      },
+    })
+  }
+
+  async sendChange({ documentText }: { documentText: string }) {
+    if (!this.client.ready) return
+    try {
+      await this.client.textDocumentDidChange({
+        textDocument: {
+          uri: this.documentUri,
+          version: this.documentVersion++,
+        },
+        contentChanges: [{ text: documentText }],
+      })
+    } catch (e) {
+      console.error(e)
+    }
+  }
+
+  requestDiagnostics(view: EditorView) {
+    this.sendChange({ documentText: view.state.doc.toString() })
+  }
+
+  async requestHoverTooltip(
+    view: EditorView,
+    { line, character }: { line: number; character: number }
+  ): Promise<Tooltip | null> {
+    if (
+      !this.client.ready ||
+      !this.client.getServerCapabilities().hoverProvider
+    )
+      return null
+
+    this.sendChange({ documentText: view.state.doc.toString() })
+    const result = await this.client.textDocumentHover({
+      textDocument: { uri: this.documentUri },
+      position: { line, character },
+    })
+    if (!result) return null
+    const { contents, range } = result
+    let pos = posToOffset(view.state.doc, { line, character })!
+    let end: number | undefined
+    if (range) {
+      pos = posToOffset(view.state.doc, range.start)!
+      end = posToOffset(view.state.doc, range.end)
+    }
+    if (pos === null) return null
+    const dom = document.createElement('div')
+    dom.classList.add('documentation')
+    if (this.allowHTMLContent) dom.innerHTML = formatContents(contents)
+    else dom.textContent = formatContents(contents)
+    return { pos, end, create: (view) => ({ dom }), above: true }
+  }
+
+  async requestCompletion(
+    context: CompletionContext,
+    { line, character }: { line: number; character: number },
+    {
+      triggerKind,
+      triggerCharacter,
+    }: {
+      triggerKind: CompletionTriggerKind
+      triggerCharacter: string | undefined
+    }
+  ): Promise<CompletionResult | null> {
+    if (
+      !this.client.ready ||
+      !this.client.getServerCapabilities().completionProvider
+    )
+      return null
+
+    this.sendChange({
+      documentText: context.state.doc.toString(),
+    })
+
+    const result = await this.client.textDocumentCompletion({
+      textDocument: { uri: this.documentUri },
+      position: { line, character },
+      context: {
+        triggerKind,
+        triggerCharacter,
+      },
+    })
+
+    if (!result) return null
+
+    const items = 'items' in result ? result.items : result
+
+    let options = items.map(
+      ({
+        detail,
+        label,
+        labelDetails,
+        kind,
+        textEdit,
+        documentation,
+        deprecated,
+        insertText,
+        insertTextFormat,
+        sortText,
+        filterText,
+      }) => {
+        const completion: Completion & {
+          filterText: string
+          sortText?: string
+          apply: string
+        } = {
+          label,
+          detail: labelDetails ? labelDetails.detail : detail,
+          apply: label,
+          type: kind && CompletionItemKindMap[kind].toLowerCase(),
+          sortText: sortText ?? label,
+          filterText: filterText ?? label,
+        }
+        if (documentation) {
+          completion.info = () => {
+            const htmlString = formatContents(documentation)
+            const htmlNode = document.createElement('div')
+            htmlNode.style.display = 'contents'
+            htmlNode.innerHTML = htmlString
+            return { dom: htmlNode }
+          }
+        }
+
+        return completion
+      }
+    )
+
+    return completeFromList(options)(context)
+  }
+
+  processNotification(notification: Notification) {
+    try {
+      switch (notification.method) {
+        case 'textDocument/publishDiagnostics':
+          this.processDiagnostics(notification.params)
+      }
+    } catch (error) {
+      console.error(error)
+    }
+  }
+
+  processDiagnostics(params: PublishDiagnosticsParams) {
+    if (params.uri !== this.documentUri) return
+
+    const diagnostics = params.diagnostics
+      .map(({ range, message, severity }) => ({
+        from: posToOffset(this.view.state.doc, range.start)!,
+        to: posToOffset(this.view.state.doc, range.end)!,
+        severity: (
+          {
+            [DiagnosticSeverity.Error]: 'error',
+            [DiagnosticSeverity.Warning]: 'warning',
+            [DiagnosticSeverity.Information]: 'info',
+            [DiagnosticSeverity.Hint]: 'info',
+          } as const
+        )[severity!],
+        message,
+      }))
+      .filter(
+        ({ from, to }) =>
+          from !== null && to !== null && from !== undefined && to !== undefined
+      )
+      .sort((a, b) => {
+        switch (true) {
+          case a.from < b.from:
+            return -1
+          case a.from > b.from:
+            return 1
+        }
+        return 0
+      })
+
+    this.view.dispatch(setDiagnostics(this.view.state, diagnostics))
+  }
+}
+
+export function kclPlugin(options: LanguageServerOptions) {
+  let plugin: LanguageServerPlugin | null = null
+
+  return [
+    client.of(options.client),
+    documentUri.of(options.documentUri),
+    languageId.of('kcl'),
+    ViewPlugin.define(
+      (view) =>
+        (plugin = new LanguageServerPlugin(view, options.allowHTMLContent))
+    ),
+    hoverTooltip(
+      (view, pos) =>
+        plugin?.requestHoverTooltip(view, offsetToPos(view.state.doc, pos)) ??
+        null
+    ),
+    tooltips({
+      position: 'absolute',
+    }),
+    autocompletion({
+      override: [
+        async (context) => {
+          if (plugin == null) return null
+
+          const { state, pos, explicit } = context
+          const line = state.doc.lineAt(pos)
+          let trigKind: CompletionTriggerKind = CompletionTriggerKind.Invoked
+          let trigChar: string | undefined
+          if (
+            !explicit &&
+            plugin.client
+              .getServerCapabilities()
+              .completionProvider?.triggerCharacters?.includes(
+                line.text[pos - line.from - 1]
+              )
+          ) {
+            trigKind = CompletionTriggerKind.TriggerCharacter
+            trigChar = line.text[pos - line.from - 1]
+          }
+          if (
+            trigKind === CompletionTriggerKind.Invoked &&
+            !context.matchBefore(/\w+$/)
+          ) {
+            return null
+          }
+          return await plugin.requestCompletion(
+            context,
+            offsetToPos(state.doc, pos),
+            {
+              triggerKind: trigKind,
+              triggerCharacter: trigChar,
+            }
+          )
+        },
+      ],
+    }),
+  ]
+}
+
+export function posToOffset(
+  doc: Text,
+  pos: { line: number; character: number }
+): number | undefined {
+  if (pos.line >= doc.lines) return
+  const offset = doc.line(pos.line + 1).from + pos.character
+  if (offset > doc.length) return
+  return offset
+}
+
+function offsetToPos(doc: Text, offset: number) {
+  const line = doc.lineAt(offset)
+  return {
+    line: line.number - 1,
+    character: offset - line.from,
+  }
+}
+
+function formatContents(
+  contents: LSP.MarkupContent | LSP.MarkedString | LSP.MarkedString[]
+): string {
+  if (Array.isArray(contents)) {
+    return contents.map((c) => formatContents(c) + '\n\n').join('')
+  } else if (typeof contents === 'string') {
+    return Marked.parse(contents)
+  } else {
+    return Marked.parse(contents.value)
+  }
+}
--- a/src/editor/lsp/semantic_tokens.ts
+++ b/src/editor/lsp/semantic_tokens.ts
@ -0,0 +1,51 @@
+import type * as LSP from 'vscode-languageserver-protocol'
+
+export class SemanticToken {
+  delta_line: number
+  delta_start: number
+  length: number
+  token_type: string
+  token_modifiers_bitset: string
+
+  constructor(
+    delta_line = 0,
+    delta_start = 0,
+    length = 0,
+    token_type = '',
+    token_modifiers_bitset = ''
+  ) {
+    this.delta_line = delta_line
+    this.delta_start = delta_start
+    this.length = length
+    this.token_type = token_type
+    this.token_modifiers_bitset = token_modifiers_bitset
+  }
+}
+
+export function deserializeTokens(
+  data: number[],
+  semanticTokensProvider?: LSP.SemanticTokensOptions
+): SemanticToken[] {
+  if (!semanticTokensProvider) {
+    return []
+  }
+  // Check if data length is divisible by 5
+  if (data.length % 5 !== 0) {
+    throw new Error('Length is not divisible by 5')
+  }
+
+  const tokens = []
+  for (let i = 0; i < data.length; i += 5) {
+    tokens.push(
+      new SemanticToken(
+        data[i],
+        data[i + 1],
+        data[i + 2],
+        semanticTokensProvider.legend.tokenTypes[data[i + 3]],
+        semanticTokensProvider.legend.tokenModifiers[data[i + 4]]
+      )
+    )
+  }
+
+  return tokens
+}
--- a/src/editor/lsp/server-capability-registration.ts
+++ b/src/editor/lsp/server-capability-registration.ts
@ -0,0 +1,80 @@
+import {
+  Registration,
+  ServerCapabilities,
+  Unregistration,
+} from 'vscode-languageserver-protocol'
+
+interface IFlexibleServerCapabilities extends ServerCapabilities {
+  [key: string]: any
+}
+
+interface IMethodServerCapabilityProviderDictionary {
+  [key: string]: string
+}
+
+const ServerCapabilitiesProviders: IMethodServerCapabilityProviderDictionary = {
+  'textDocument/hover': 'hoverProvider',
+  'textDocument/completion': 'completionProvider',
+  'textDocument/signatureHelp': 'signatureHelpProvider',
+  'textDocument/definition': 'definitionProvider',
+  'textDocument/typeDefinition': 'typeDefinitionProvider',
+  'textDocument/implementation': 'implementationProvider',
+  'textDocument/references': 'referencesProvider',
+  'textDocument/documentHighlight': 'documentHighlightProvider',
+  'textDocument/documentSymbol': 'documentSymbolProvider',
+  'textDocument/workspaceSymbol': 'workspaceSymbolProvider',
+  'textDocument/codeAction': 'codeActionProvider',
+  'textDocument/codeLens': 'codeLensProvider',
+  'textDocument/documentFormatting': 'documentFormattingProvider',
+  'textDocument/documentRangeFormatting': 'documentRangeFormattingProvider',
+  'textDocument/documentOnTypeFormatting': 'documentOnTypeFormattingProvider',
+  'textDocument/rename': 'renameProvider',
+  'textDocument/documentLink': 'documentLinkProvider',
+  'textDocument/color': 'colorProvider',
+  'textDocument/foldingRange': 'foldingRangeProvider',
+  'textDocument/declaration': 'declarationProvider',
+  'textDocument/executeCommand': 'executeCommandProvider',
+}
+
+function registerServerCapability(
+  serverCapabilities: ServerCapabilities,
+  registration: Registration
+): ServerCapabilities {
+  const serverCapabilitiesCopy = JSON.parse(
+    JSON.stringify(serverCapabilities)
+  ) as IFlexibleServerCapabilities
+  const { method, registerOptions } = registration
+  const providerName = ServerCapabilitiesProviders[method]
+
+  if (providerName) {
+    if (!registerOptions) {
+      serverCapabilitiesCopy[providerName] = true
+    } else {
+      serverCapabilitiesCopy[providerName] = Object.assign(
+        {},
+        JSON.parse(JSON.stringify(registerOptions))
+      )
+    }
+  } else {
+    throw new Error('Could not register server capability.')
+  }
+
+  return serverCapabilitiesCopy
+}
+
+function unregisterServerCapability(
+  serverCapabilities: ServerCapabilities,
+  unregistration: Unregistration
+): ServerCapabilities {
+  const serverCapabilitiesCopy = JSON.parse(
+    JSON.stringify(serverCapabilities)
+  ) as IFlexibleServerCapabilities
+  const { method } = unregistration
+  const providerName = ServerCapabilitiesProviders[method]
+
+  delete serverCapabilitiesCopy[providerName]
+
+  return serverCapabilitiesCopy
+}
+
+export { registerServerCapability, unregisterServerCapability }
--- a/src/editor/lsp/server.ts
+++ b/src/editor/lsp/server.ts
@ -0,0 +1,42 @@
+import init, {
+  InitOutput,
+  lsp_run,
+  ServerConfig,
+} from '../../wasm-lib/pkg/wasm_lib'
+import { FromServer, IntoServer } from './codec'
+
+let server: null | Server
+
+export default class Server {
+  readonly initOutput: InitOutput
+  readonly #intoServer: IntoServer
+  readonly #fromServer: FromServer
+
+  private constructor(
+    initOutput: InitOutput,
+    intoServer: IntoServer,
+    fromServer: FromServer
+  ) {
+    this.initOutput = initOutput
+    this.#intoServer = intoServer
+    this.#fromServer = fromServer
+  }
+
+  static async initialize(
+    intoServer: IntoServer,
+    fromServer: FromServer
+  ): Promise<Server> {
+    if (null == server) {
+      const initOutput = await init()
+      server = new Server(initOutput, intoServer, fromServer)
+    } else {
+      console.warn('Server already initialized; ignoring')
+    }
+    return server
+  }
+
+  async start(): Promise<void> {
+    const config = new ServerConfig(this.#intoServer, this.#fromServer)
+    await lsp_run(config)
+  }
+}
--- a/src/editor/lsp/tracer.ts
+++ b/src/editor/lsp/tracer.ts
@ -0,0 +1,21 @@
+import { Message } from 'vscode-languageserver-protocol'
+
+const env = import.meta.env.MODE
+
+export default class Tracer {
+  static client(message: string): void {
+    // These are really noisy, so we have a special env var for them.
+    if (env === 'lsp_tracing') {
+      console.log('lsp client message', message)
+    }
+  }
+
+  static server(input: string | Message): void {
+    // These are really noisy, so we have a special env var for them.
+    if (env === 'lsp_tracing') {
+      const message: string =
+        typeof input === 'string' ? input : JSON.stringify(input)
+      console.log('lsp server message', message)
+    }
+  }
+}
--- a/src/env.ts
+++ b/src/env.ts
@ -10,4 +10,5 @@ export const VITE_KC_API_BASE_URL = import.meta.env.VITE_KC_API_BASE_URL
 export const VITE_KC_SITE_BASE_URL = import.meta.env.VITE_KC_SITE_BASE_URL
 export const VITE_KC_CONNECTION_TIMEOUT_MS = import.meta.env
  .VITE_KC_CONNECTION_TIMEOUT_MS
+export const VITE_KC_SENTRY_DSN = import.meta.env.VITE_KC_SENTRY_DSN
 export const TEST = import.meta.env.TEST
--- a/src/hooks/useToolbarGuards.ts
+++ b/src/hooks/useToolbarGuards.ts
@ -0,0 +1,56 @@
+import { SetVarNameModal } from 'components/SetVarNameModal'
+import { moveValueIntoNewVariable } from 'lang/modifyAst'
+import { isNodeSafeToReplace } from 'lang/queryAst'
+import { useEffect, useState } from 'react'
+import { create } from 'react-modal-promise'
+import { useStore } from 'useStore'
+
+const getModalInfo = create(SetVarNameModal as any)
+
+export function useConvertToVariable() {
+  const { guiMode, selectionRanges, ast, programMemory, updateAst } = useStore(
+    (s) => ({
+      guiMode: s.guiMode,
+      ast: s.ast,
+      updateAst: s.updateAst,
+      selectionRanges: s.selectionRanges,
+      programMemory: s.programMemory,
+    })
+  )
+  const [enable, setEnabled] = useState(false)
+  useEffect(() => {
+    if (!ast) return
+
+    const { isSafe, value } = isNodeSafeToReplace(
+      ast,
+      selectionRanges.codeBasedSelections?.[0]?.range || []
+    )
+    const canReplace = isSafe && value.type !== 'Identifier'
+    const isOnlyOneSelection = selectionRanges.codeBasedSelections.length === 1
+
+    const _enableHorz = canReplace && isOnlyOneSelection
+    setEnabled(_enableHorz)
+  }, [guiMode, selectionRanges])
+
+  const handleClick = async () => {
+    if (!ast) return
+    try {
+      const { variableName } = await getModalInfo({
+        valueName: 'var',
+      } as any)
+
+      const { modifiedAst: _modifiedAst } = moveValueIntoNewVariable(
+        ast,
+        programMemory,
+        selectionRanges.codeBasedSelections[0].range,
+        variableName
+      )
+
+      updateAst(_modifiedAst)
+    } catch (e) {
+      console.log('e', e)
+    }
+  }
+
+  return { enable, handleClick }
+}
--- a/src/index.css
+++ b/src/index.css
@ -82,12 +82,36 @@ code {
    monospace;
 }

+.full-height-subtract {
+  --height-subtract: 2.25rem;
+  height: 100%;
+  max-height: calc(100% - var(--height-subtract));
+}
+
 #code-mirror-override .cm-editor {
-  @apply bg-transparent;
+  @apply h-full bg-transparent;
+}
+
+#code-mirror-override .cm-scroller {
+  @apply h-full;
+}
+
+#code-mirror-override .cm-scroller::-webkit-scrollbar {
+  @apply h-0;
+}
+
+#code-mirror-override .cm-activeLine,
+#code-mirror-override .cm-activeLineGutter {
+  @apply bg-liquid-10/50;
+}
+
+.dark #code-mirror-override .cm-activeLine,
+.dark #code-mirror-override .cm-activeLineGutter {
+  @apply bg-liquid-80/50;
 }

 #code-mirror-override .cm-gutters {
-  @apply bg-chalkboard-10/50;
+  @apply bg-chalkboard-10/30;
 }

 .dark #code-mirror-override .cm-gutters {
@ -99,16 +123,68 @@ code {
 }
 #code-mirror-override .cm-cursor {
  display: block;
-  width: 200px;
-  background: linear-gradient(
-    to right,
-    rgb(0, 55, 94) 0%,
-    #0084e2ff 2%,
-    #0084e255 5%,
-    transparent 100%
-  );
+  width: 1ch;
+  @apply bg-liquid-40 mix-blend-multiply;
+
+  animation: blink 2s ease-out infinite;
+}
+
+.dark #code-mirror-override .cm-cursor {
+  @apply bg-liquid-50;
+}
+
+@keyframes blink {
+  0%,
+  100% {
+    opacity: 0;
+  }
+  15% {
+    opacity: 0.75;
+  }
 }

 .react-json-view {
  @apply bg-transparent !important;
 }
+
+#code-mirror-override .cm-tooltip {
+  @apply text-xs shadow-md;
+  @apply bg-chalkboard-10 text-chalkboard-80;
+  @apply rounded-sm border-solid border border-chalkboard-40/30 border-l-liquid-10;
+}
+
+.dark #code-mirror-override .cm-tooltip {
+  @apply bg-chalkboard-110 text-chalkboard-40;
+  @apply border-chalkboard-70/20 border-l-liquid-70;
+}
+
+#code-mirror-override .cm-tooltip-hover {
+  @apply py-1 px-2 w-max max-w-md;
+}
+
+#code-mirror-override .cm-completionInfo {
+  @apply px-4 rounded-l-none;
+  @apply bg-chalkboard-10 text-liquid-90;
+  @apply border-liquid-40/30;
+}
+
+.dark #code-mirror-override .cm-completionInfo {
+  @apply bg-liquid-120 text-liquid-50;
+  @apply border-liquid-90/60;
+}
+
+#code-mirror-override .cm-tooltip-autocomplete li {
+  @apply px-2 py-1;
+}
+#code-mirror-override .cm-tooltip-autocomplete li[aria-selected='true'] {
+  @apply bg-liquid-10 text-liquid-110;
+}
+.dark #code-mirror-override .cm-tooltip-autocomplete li[aria-selected='true'] {
+  @apply bg-liquid-100 text-liquid-20;
+}
+
+#code-mirror-override .cm-content {
+  white-space: pre-wrap;
+  word-break: normal;
+  word-wrap: break-word;
+}
--- a/src/lang/abstractSyntaxTree.test.ts
+++ b/src/lang/abstractSyntaxTree.test.ts
@ -179,6 +179,9 @@ const newVar = myVar + 1
              name: 'aIdentifier',
            },
          ],
+          function: {
+            type: 'InMemory',
+          },
          optional: false,
        },
      },
@ -211,7 +214,6 @@ describe('testing function declaration', () => {
              type: 'FunctionExpression',
              start: 11,
              end: 19,
-              id: null,
              params: [],
              body: {
                start: 17,
@ -250,7 +252,6 @@ describe('testing function declaration', () => {
              type: 'FunctionExpression',
              start: 11,
              end: 39,
-              id: null,
              params: [
                {
                  type: 'Identifier',
@ -326,7 +327,6 @@ const myVar = funcN(1, 2)`
              type: 'FunctionExpression',
              start: 11,
              end: 37,
-              id: null,
              params: [
                {
                  type: 'Identifier',
@ -416,6 +416,9 @@ const myVar = funcN(1, 2)`
                  raw: '2',
                },
              ],
+              function: {
+                type: 'InMemory',
+              },
              optional: false,
            },
          },
@ -485,6 +488,7 @@ describe('testing pipe operator special', () => {
                      ],
                    },
                  ],
+                  function: expect.any(Object),
                  optional: false,
                },
                {
@ -521,6 +525,7 @@ describe('testing pipe operator special', () => {
                    },
                    { type: 'PipeSubstitution', start: 59, end: 60 },
                  ],
+                  function: expect.any(Object),
                  optional: false,
                },
                {
@ -593,6 +598,7 @@ describe('testing pipe operator special', () => {
                    },
                    { type: 'PipeSubstitution', start: 105, end: 106 },
                  ],
+                  function: expect.any(Object),
                  optional: false,
                },
                {
@ -629,6 +635,7 @@ describe('testing pipe operator special', () => {
                    },
                    { type: 'PipeSubstitution', start: 128, end: 129 },
                  ],
+                  function: expect.any(Object),
                  optional: false,
                },
                {
@ -651,6 +658,9 @@ describe('testing pipe operator special', () => {
                    },
                    { type: 'PipeSubstitution', start: 143, end: 144 },
                  ],
+                  function: {
+                    type: 'InMemory',
+                  },
                  optional: false,
                },
              ],
@ -730,6 +740,9 @@ describe('testing pipe operator special', () => {
                      end: 35,
                    },
                  ],
+                  function: {
+                    type: 'InMemory',
+                  },
                  optional: false,
                },
              ],
@ -1550,7 +1563,10 @@ const key = 'c'`
      type: 'NoneCodeNode',
      start: code.indexOf('\n// this is a comment'),
      end: code.indexOf('const key'),
-      value: '\n// this is a comment\n',
+      value: {
+        type: 'blockComment',
+        value: 'this is a comment',
+      },
    }
    const { nonCodeMeta } = parser_wasm(code)
    expect(nonCodeMeta.noneCodeNodes[0]).toEqual(nonCodeMetaInstance)
@ -1560,7 +1576,9 @@ const key = 'c'`
    const { nonCodeMeta: nonCodeMeta2 } = parser_wasm(
      codeWithExtraStartWhitespace
    )
-    expect(nonCodeMeta2.noneCodeNodes[0].value).toBe(nonCodeMetaInstance.value)
+    expect(nonCodeMeta2.noneCodeNodes[0].value).toStrictEqual(
+      nonCodeMetaInstance.value
+    )
    expect(nonCodeMeta2.noneCodeNodes[0].start).not.toBe(
      nonCodeMetaInstance.start
    )
@ -1583,7 +1601,10 @@ const key = 'c'`
      type: 'NoneCodeNode',
      start: 106,
      end: 166,
-      value: ' /* this is\n      a comment\n      spanning a few lines */\n  ',
+      value: {
+        type: 'blockComment',
+        value: 'this is\n      a comment\n      spanning a few lines',
+      },
    })
  })
  it('comments in a pipe expression', () => {
@ -1603,7 +1624,10 @@ const key = 'c'`
      type: 'NoneCodeNode',
      start: 125,
      end: 141,
-      value: '\n// a comment\n  ',
+      value: {
+        type: 'blockComment',
+        value: 'a comment',
+      },
    })
  })
 })
@ -1627,6 +1651,7 @@ describe('test UnaryExpression', () => {
          { type: 'Literal', start: 19, end: 20, value: 4, raw: '4' },
          { type: 'Literal', start: 22, end: 25, value: 100, raw: '100' },
        ],
+        function: expect.any(Object),
        optional: false,
      },
    })
@ -1660,10 +1685,12 @@ describe('testing nested call expressions', () => {
              { type: 'Literal', start: 34, end: 35, value: 5, raw: '5' },
              { type: 'Literal', start: 37, end: 38, value: 3, raw: '3' },
            ],
+            function: expect.any(Object),
            optional: false,
          },
        },
      ],
+      function: expect.any(Object),
      optional: false,
    })
  })
@ -1695,6 +1722,7 @@ describe('should recognise callExpresions in binaryExpressions', () => {
            },
            { type: 'PipeSubstitution', start: 25, end: 26 },
          ],
+          function: expect.any(Object),
          optional: false,
        },
        right: { type: 'Literal', value: 1, raw: '1', start: 30, end: 31 },
--- a/src/lang/modifyAst.ts
+++ b/src/lang/modifyAst.ts
@ -36,14 +36,14 @@ export function addSketchTo(
  const _node = { ...node }
  const _name = name || findUniqueName(node, 'part')

-  const startSketchAt = createCallExpression('startSketchAt', [
+  const startSketchAt = createCallExpressionStdLib('startSketchAt', [
    createLiteral('default'),
  ])
  const rotate = createCallExpression(axis === 'xz' ? 'rx' : 'ry', [
    createLiteral(90),
    createPipeSubstitution(),
  ])
-  const initialLineTo = createCallExpression('line', [
+  const initialLineTo = createCallExpressionStdLib('line', [
    createLiteral('default'),
    createPipeSubstitution(),
  ])
@ -112,7 +112,9 @@ function addToShow(node: Program, name: string): Program {
  const dumbyStartend = { start: 0, end: 0 }
  const showCallIndex = getShowIndex(_node)
  if (showCallIndex === -1) {
-    const showCall = createCallExpression('show', [createIdentifier(name)])
+    const showCall = createCallExpressionStdLib('show', [
+      createIdentifier(name),
+    ])
    const showExpressionStatement: ExpressionStatement = {
      type: 'ExpressionStatement',
      ...dumbyStartend,
@ -124,7 +126,7 @@ function addToShow(node: Program, name: string): Program {
  const showCall = { ..._node.body[showCallIndex] } as ExpressionStatement
  const showCallArgs = (showCall.expression as CallExpression).arguments
  const newShowCallArgs: Value[] = [...showCallArgs, createIdentifier(name)]
-  const newShowExpression = createCallExpression('show', newShowCallArgs)
+  const newShowExpression = createCallExpressionStdLib('show', newShowCallArgs)

  _node.body[showCallIndex] = {
    ...showCall,
@ -225,7 +227,7 @@ export function extrudeSketch(
  const { node: variableDeclorator, shallowPath: pathToDecleration } =
    getNodeFromPath<VariableDeclarator>(_node, pathToNode, 'VariableDeclarator')

-  const extrudeCall = createCallExpression('extrude', [
+  const extrudeCall = createCallExpressionStdLib('extrude', [
    createLiteral(4),
    shouldPipe
      ? createPipeSubstitution()
@ -313,15 +315,15 @@ export function sketchOnExtrudedFace(
  const newSketch = createVariableDeclaration(
    newSketchName,
    createPipeExpression([
-      createCallExpression('startSketchAt', [
+      createCallExpressionStdLib('startSketchAt', [
        createArrayExpression([createLiteral(0), createLiteral(0)]),
      ]),
-      createCallExpression('lineTo', [
+      createCallExpressionStdLib('lineTo', [
        createArrayExpression([createLiteral(1), createLiteral(1)]),
        createPipeSubstitution(),
      ]),
      createCallExpression('transform', [
-        createCallExpression('getExtrudeWallTransform', [
+        createCallExpressionStdLib('getExtrudeWallTransform', [
          createLiteral(tag),
          createIdentifier(oldSketchName),
        ]),
@ -414,6 +416,40 @@ export function createPipeSubstitution(): PipeSubstitution {
  }
 }

+export function createCallExpressionStdLib(
+  name: string,
+  args: CallExpression['arguments']
+): CallExpression {
+  return {
+    type: 'CallExpression',
+    start: 0,
+    end: 0,
+    callee: {
+      type: 'Identifier',
+      start: 0,
+      end: 0,
+      name,
+    },
+    function: {
+      type: 'StdLib',
+      func: {
+        // We only need the name here to map it back when it serializes
+        // to rust, don't worry about the rest.
+        name,
+        summary: '',
+        description: '',
+        tags: [],
+        returnValue: { type: '', required: false, name: '', schema: {} },
+        args: [],
+        unpublished: false,
+        deprecated: false,
+      },
+    },
+    optional: false,
+    arguments: args,
+  }
+}
+
 export function createCallExpression(
  name: string,
  args: CallExpression['arguments']
@ -428,6 +464,9 @@ export function createCallExpression(
      end: 0,
      name,
    },
+    function: {
+      type: 'InMemory',
+    },
    optional: false,
    arguments: args,
  }
--- a/src/lang/recast.test.ts
+++ b/src/lang/recast.test.ts
@ -45,8 +45,7 @@ const newVar = myVar + 1`
    expect(recasted).toBe(code.trim())
  })
  it('test with function call', () => {
-    const code = `
-const myVar = "hello"
+    const code = `const myVar = "hello"
 log(5, myVar)`
    const { ast } = code2ast(code)
    const recasted = recast(ast)
@ -71,8 +70,7 @@ log(5, myVar)`
  |> lineTo({ to: [1, 0], tag: "rightPath" }, %)
  |> close(%)

-show(mySketch)
-`
+show(mySketch)`
    const { ast } = code2ast(code)
    const recasted = recast(ast)
    expect(recasted).toBe(code.trim())
@ -186,8 +184,7 @@ const myVar2 = yo['a'][key2].c`

 describe('testing recasting with comments and whitespace', () => {
  it('code with comments', () => {
-    const code = `
-const yo = { a: { b: { c: '123' } } }
+    const code = `const yo = { a: { b: { c: '123' } } }
 // this is a comment
 const key = 'c'`

@ -197,20 +194,18 @@ const key = 'c'`
    expect(recasted).toBe(code)
  })
  it('code with comment and extra lines', () => {
-    const code = `
-const yo = 'c' /* this is
+    const code = `const yo = 'c'
+
+/* this is
 a
 comment */
-
 const yo = 'bing'`
    const { ast } = code2ast(code)
    const recasted = recast(ast)
    expect(recasted).toBe(code)
  })
  it('comments at the start and end', () => {
-    const code = `
-// this is a comment
-
+    const code = `// this is a comment
 const yo = { a: { b: { c: '123' } } }
 const key = 'c'

@ -220,12 +215,12 @@ const key = 'c'
    expect(recasted).toBe(code)
  })
  it('comments in a fn block', () => {
-    const code = `
-const myFn = () => {
+    const code = `const myFn = () => {
  // this is a comment
-  const yo = { a: { b: { c: '123' } } } /* block
-  comment */
+  const yo = { a: { b: { c: '123' } } }

+  /* block
+  comment */
  const key = 'c'
  // this is also a comment
 }`
@ -255,7 +250,7 @@ const mySk1 = startSketchAt([0, 0])
  // comment here
  |> lineTo({ to: [0, 1], tag: 'myTag' }, %)
  |> lineTo([1, 1], %) /* and
-  here 
+  here
  */
  // a comment between pipe expression statements
  |> rx(90, %)
@ -269,7 +264,21 @@ const mySk1 = startSketchAt([0, 0])
  */`
    const { ast } = code2ast(code)
    const recasted = recast(ast)
-    expect(recasted).toBe(code)
+    expect(recasted).toBe(`// comment at start
+const mySk1 = startSketchAt([0, 0])
+  |> lineTo([1, 1], %)
+  // comment here
+  |> lineTo({ to: [0, 1], tag: 'myTag' }, %)
+  |> lineTo([1, 1], %)
+  /* and
+  here
+
+a comment between pipe expression statements */
+  |> rx(90, %)
+  // and another with just white space between others below
+  |> ry(45, %)
+  |> rx(45, %)
+// one more for good measure`)
  })
 })

@ -295,7 +304,7 @@ describe('testing call Expressions in BinaryExpressions and UnaryExpressions', (
  it('with unaryExpression in sketch situation', () => {
    const code = [
      'const part001 = startSketchAt([0, 0])',
-      '|> line([-2.21, -legLen(5, min(3, 999))], %)',
+      '  |> line([-2.21, -legLen(5, min(3, 999))], %)',
    ].join('\n')
    const { ast } = code2ast(code)
    const recasted = recast(ast)
@ -309,10 +318,10 @@ describe('it recasts wrapped object expressions in pipe bodies with correct inde
  |> line({ to: [0.62, 4.15], tag: 'seg01' }, %)
  |> line([2.77, -1.24], %)
  |> angledLineThatIntersects({
-      angle: 201,
-      offset: -1.35,
-      intersectTag: 'seg01'
-    }, %)
+       angle: 201,
+       offset: -1.35,
+       intersectTag: 'seg01'
+     }, %)
  |> line([-0.42, -1.72], %)
 show(part001)`
    const { ast } = code2ast(code)
--- a/src/lang/std/engineConnection.ts
+++ b/src/lang/std/engineConnection.ts
@ -4,12 +4,18 @@ import { VITE_KC_API_WS_MODELING_URL, VITE_KC_CONNECTION_TIMEOUT_MS } from 'env'
 import { Models } from '@kittycad/lib'
 import { exportSave } from 'lib/exportSave'
 import { v4 as uuidv4 } from 'uuid'
+import * as Sentry from '@sentry/react'

-interface ResultCommand {
+interface CommandInfo {
+  commandType: CommandTypes
+  range: SourceRange
+  parentId?: string
+}
+interface ResultCommand extends CommandInfo {
  type: 'result'
  data: any
 }
-interface PendingCommand {
+interface PendingCommand extends CommandInfo {
  type: 'pending'
  promise: Promise<any>
  resolve: (val: any) => void
@ -22,16 +28,6 @@ export interface SourceRangeMap {
  [key: string]: SourceRange
 }

-interface SelectionsArgs {
-  id: string
-  type: Selections['codeBasedSelections'][number]['type']
-}
-
-interface CursorSelectionsArgs {
-  otherSelections: Selections['otherSelections']
-  idBasedSelections: { type: string; id: string }[]
-}
-
 interface NewTrackArgs {
  conn: EngineConnection
  mediaStream: MediaStream
@ -39,13 +35,15 @@ interface NewTrackArgs {

 type WebSocketResponse = Models['OkWebSocketResponseData_type']

+type ClientMetrics = Models['ClientMetrics_type']
+
 // EngineConnection encapsulates the connection(s) to the Engine
 // for the EngineCommandManager; namely, the underlying WebSocket
 // and WebRTC connections.
 export class EngineConnection {
  websocket?: WebSocket
  pc?: RTCPeerConnection
-  lossyDataChannel?: RTCDataChannel
+  unreliableDataChannel?: RTCDataChannel

  private ready: boolean

@ -58,6 +56,9 @@ export class EngineConnection {
  private onClose: (engineConnection: EngineConnection) => void
  private onNewTrack: (track: NewTrackArgs) => void

+  // TODO: actual type is ClientMetrics
+  private webrtcStatsCollector?: () => Promise<ClientMetrics>
+
  constructor({
    url,
    token,
@ -107,6 +108,11 @@ export class EngineConnection {
  isReady() {
    return this.ready
  }
+  // shouldTrace will return true when Sentry should be used to instrument
+  // the Engine.
+  shouldTrace() {
+    return Sentry.getCurrentHub()?.getClient()?.getOptions()?.sendClientReports
+  }
  // connect will attempt to connect to the Engine over a WebSocket, and
  // establish the WebRTC connections.
  //
@ -116,6 +122,44 @@ export class EngineConnection {
    // TODO(paultag): make this safe to call multiple times, and figure out
    // when a connection is in progress (state: connecting or something).

+    // Information on the connect transaction
+
+    class SpanPromise {
+      span: Sentry.Span
+      promise: Promise<void>
+      resolve?: (v: void) => void
+
+      constructor(span: Sentry.Span) {
+        this.span = span
+        this.promise = new Promise((resolve) => {
+          this.resolve = (v: void) => {
+            // here we're going to invoke finish before resolving the
+            // promise so that a `.then()` will order strictly after
+            // all spans have -- for sure -- been resolved, rather than
+            // doing a `then` on this promise.
+            this.span.finish()
+            resolve(v)
+          }
+        })
+      }
+    }
+
+    let webrtcMediaTransaction: Sentry.Transaction
+    let websocketSpan: SpanPromise
+    let mediaTrackSpan: SpanPromise
+    let dataChannelSpan: SpanPromise
+    let handshakeSpan: SpanPromise
+    let iceSpan: SpanPromise
+
+    if (this.shouldTrace()) {
+      webrtcMediaTransaction = Sentry.startTransaction({
+        name: 'webrtc-media',
+      })
+      websocketSpan = new SpanPromise(
+        webrtcMediaTransaction.startChild({ op: 'websocket' })
+      )
+    }
+
    this.websocket = new WebSocket(this.url, [])
    this.websocket.binaryType = 'arraybuffer'

@ -129,6 +173,39 @@ export class EngineConnection {
    })

    this.websocket.addEventListener('open', (event) => {
+      if (this.shouldTrace()) {
+        websocketSpan.resolve?.()
+
+        handshakeSpan = new SpanPromise(
+          webrtcMediaTransaction.startChild({ op: 'handshake' })
+        )
+        iceSpan = new SpanPromise(
+          webrtcMediaTransaction.startChild({ op: 'ice' })
+        )
+        dataChannelSpan = new SpanPromise(
+          webrtcMediaTransaction.startChild({
+            op: 'data-channel',
+          })
+        )
+        mediaTrackSpan = new SpanPromise(
+          webrtcMediaTransaction.startChild({
+            op: 'media-track',
+          })
+        )
+      }
+
+      if (this.shouldTrace()) {
+        Promise.all([
+          handshakeSpan.promise,
+          iceSpan.promise,
+          dataChannelSpan.promise,
+          mediaTrackSpan.promise,
+        ]).then(() => {
+          console.log('All spans finished, reporting')
+          webrtcMediaTransaction?.finish()
+        })
+      }
+
      this.onWebsocketOpen(this)
    })

@ -191,6 +268,13 @@ export class EngineConnection {
              sdp: answer.sdp,
            })
          )
+
+          if (this.shouldTrace()) {
+            // When both ends have a local and remote SDP, we've been able to
+            // set up successfully. We'll still need to find the right ICE
+            // servers, but this is hand-shook.
+            handshakeSpan.resolve?.()
+          }
        }
      } else if (resp.type === 'trickle_ice') {
        let candidate = resp.data?.candidate
@ -220,9 +304,11 @@ export class EngineConnection {
        // PeerConnection and waiting for events to fire our callbacks.

        this.pc.addEventListener('connectionstatechange', (event) => {
-          // if (this.pc?.iceConnectionState === 'disconnected') {
-          //   this.close()
-          // }
+          if (this.pc?.iceConnectionState === 'connected') {
+            if (this.shouldTrace()) {
+              iceSpan.resolve?.()
+            }
+          }
        })

        this.pc.addEventListener('icecandidate', (event) => {
@ -254,6 +340,17 @@ export class EngineConnection {
            })
          })
          .catch(console.log)
+      } else if (resp.type === 'metrics_request') {
+        if (this.webrtcStatsCollector === undefined) {
+          // TODO: Error message here?
+          return
+        }
+        this.webrtcStatsCollector().then((client_metrics) => {
+          this.send({
+            type: 'metrics_response',
+            metrics: client_metrics,
+          })
+        })
      }

      // TODO(paultag): This ought to be both controllable, as well as something
@ -272,58 +369,123 @@ export class EngineConnection {
    })

    this.pc.addEventListener('track', (event) => {
-      console.log('received track', event)
      const mediaStream = event.streams[0]
+
+      if (this.shouldTrace()) {
+        let mediaStreamTrack = mediaStream.getVideoTracks()[0]
+        mediaStreamTrack.addEventListener('unmute', () => {
+          // let settings = mediaStreamTrack.getSettings()
+          // mediaTrackSpan.span.setTag("fps", settings.frameRate)
+          // mediaTrackSpan.span.setTag("width", settings.width)
+          // mediaTrackSpan.span.setTag("height", settings.height)
+          mediaTrackSpan.resolve?.()
+        })
+      }
+
+      this.webrtcStatsCollector = (): Promise<ClientMetrics> => {
+        return new Promise((resolve, reject) => {
+          if (mediaStream.getVideoTracks().length !== 1) {
+            reject(new Error('too many video tracks to report'))
+            return
+          }
+
+          let videoTrack = mediaStream.getVideoTracks()[0]
+          this.pc?.getStats(videoTrack).then((videoTrackStats) => {
+            // TODO(paultag): this needs type information from the KittyCAD typescript
+            // library once it's updated
+            let client_metrics: ClientMetrics = {
+              rtc_frames_decoded: 0,
+              rtc_frames_dropped: 0,
+              rtc_frames_received: 0,
+              rtc_frames_per_second: 0,
+              rtc_freeze_count: 0,
+              rtc_jitter_sec: 0.0,
+              rtc_keyframes_decoded: 0,
+              rtc_total_freezes_duration_sec: 0.0,
+            }
+
+            // TODO(paultag): Since we can technically have multiple WebRTC
+            // video tracks (even if the Server doesn't at the moment), we
+            // ought to send stats for every video track(?), and add the stream
+            // ID into it.  This raises the cardinality of collected metrics
+            // when/if we do, but for now, just report the one stream.
+
+            videoTrackStats.forEach((videoTrackReport) => {
+              if (videoTrackReport.type === 'inbound-rtp') {
+                client_metrics.rtc_frames_decoded =
+                  videoTrackReport.framesDecoded
+                client_metrics.rtc_frames_dropped =
+                  videoTrackReport.framesDropped
+                client_metrics.rtc_frames_received =
+                  videoTrackReport.framesReceived
+                client_metrics.rtc_frames_per_second =
+                  videoTrackReport.framesPerSecond || 0
+                client_metrics.rtc_freeze_count = videoTrackReport.freezeCount
+                client_metrics.rtc_jitter_sec = videoTrackReport.jitter
+                client_metrics.rtc_keyframes_decoded =
+                  videoTrackReport.keyFramesDecoded
+                client_metrics.rtc_total_freezes_duration_sec =
+                  videoTrackReport.totalFreezesDuration
+              } else if (videoTrackReport.type === 'transport') {
+                // videoTrackReport.bytesReceived,
+                // videoTrackReport.bytesSent,
+              }
+            })
+            resolve(client_metrics)
+          })
+        })
+      }
+
      this.onNewTrack({
        conn: this,
        mediaStream: mediaStream,
      })
    })

-    // During startup, we'll track the time from `connect` being called
-    // until the 'done' event fires.
-    let connectionStarted = new Date()
-
    this.pc.addEventListener('datachannel', (event) => {
-      this.lossyDataChannel = event.channel
+      this.unreliableDataChannel = event.channel

-      console.log('accepted lossy data channel', event.channel.label)
-      this.lossyDataChannel.addEventListener('open', (event) => {
-        console.log('lossy data channel opened', event)
+      console.log('accepted unreliable data channel', event.channel.label)
+      this.unreliableDataChannel.addEventListener('open', (event) => {
+        console.log('unreliable data channel opened', event)
+        if (this.shouldTrace()) {
+          dataChannelSpan.resolve?.()
+        }

        this.onDataChannelOpen(this)

-        let timeToConnectMs = new Date().getTime() - connectionStarted.getTime()
-        console.log(`engine connection time to connect: ${timeToConnectMs}ms`)
        this.onEngineConnectionOpen(this)
        this.ready = true
      })

-      this.lossyDataChannel.addEventListener('close', (event) => {
-        console.log('lossy data channel closed')
+      this.unreliableDataChannel.addEventListener('close', (event) => {
+        console.log('unreliable data channel closed')
        this.close()
      })

-      this.lossyDataChannel.addEventListener('error', (event) => {
-        console.log('lossy data channel error')
+      this.unreliableDataChannel.addEventListener('error', (event) => {
+        console.log('unreliable data channel error')
        this.close()
      })
    })

    this.onConnectionStarted(this)
  }
-  send(message: object) {
+  send(message: object | string) {
    // TODO(paultag): Add in logic to determine the connection state and
    // take actions if needed?
-    this.websocket?.send(JSON.stringify(message))
+    this.websocket?.send(
+      typeof message === 'string' ? message : JSON.stringify(message)
+    )
  }
  close() {
    this.websocket?.close()
    this.pc?.close()
-    this.lossyDataChannel?.close()
+    this.unreliableDataChannel?.close()
    this.websocket = undefined
    this.pc = undefined
-    this.lossyDataChannel = undefined
+    this.unreliableDataChannel = undefined
+    this.webrtcStatsCollector = undefined

    this.onClose(this)
    this.ready = false
@ -331,6 +493,25 @@ export class EngineConnection {
 }

 export type EngineCommand = Models['WebSocketRequest_type']
+type ModelTypes = Models['OkModelingCmdResponse_type']['type']
+
+type CommandTypes = Models['ModelingCmd_type']['type']
+
+type UnreliableResponses = Extract<
+  Models['OkModelingCmdResponse_type'],
+  { type: 'highlight_set_entity' }
+>
+interface UnreliableSubscription<T extends UnreliableResponses['type']> {
+  event: T
+  callback: (data: Extract<UnreliableResponses, { type: T }>) => void
+}
+
+interface Subscription<T extends ModelTypes> {
+  event: T
+  callback: (
+    data: Extract<Models['OkModelingCmdResponse_type'], { type: T }>
+  ) => void
+}

 export class EngineCommandManager {
  artifactMap: ArtifactMap = {}
@ -340,10 +521,17 @@ export class EngineCommandManager {
  engineConnection?: EngineConnection
  waitForReady: Promise<void> = new Promise(() => {})
  private resolveReady = () => {}
-  onHoverCallback: (id?: string) => void = () => {}
-  onClickCallback: (selection?: SelectionsArgs) => void = () => {}
-  onCursorsSelectedCallback: (selections: CursorSelectionsArgs) => void =
-    () => {}
+
+  subscriptions: {
+    [event: string]: {
+      [localUnsubscribeId: string]: (a: any) => void
+    }
+  } = {} as any
+  unreliableSubscriptions: {
+    [event: string]: {
+      [localUnsubscribeId: string]: (a: any) => void
+    }
+  } = {} as any
  constructor({
    setMediaStream,
    setIsStreamReady,
@ -373,20 +561,28 @@ export class EngineCommandManager {
      },
      onConnectionStarted: (engineConnection) => {
        engineConnection?.pc?.addEventListener('datachannel', (event) => {
-          let lossyDataChannel = event.channel
+          let unreliableDataChannel = event.channel

-          lossyDataChannel.addEventListener('message', (event) => {
-            const result: Models['OkModelingCmdResponse_type'] = JSON.parse(
-              event.data
+          unreliableDataChannel.addEventListener('message', (event) => {
+            const result: UnreliableResponses = JSON.parse(event.data)
+            Object.values(
+              this.unreliableSubscriptions[result.type] || {}
+            ).forEach(
+              // TODO: There is only one response that uses the unreliable channel atm,
+              // highlight_set_entity, if there are more it's likely they will all have the same
+              // sequence logic, but I'm not sure if we use a single global sequence or a sequence
+              // per unreliable subscription.
+              (callback) => {
+                if (
+                  result?.data?.sequence &&
+                  result?.data.sequence > this.inSequence &&
+                  result.type === 'highlight_set_entity'
+                ) {
+                  this.inSequence = result.data.sequence
+                  callback(result)
+                }
+              }
            )
-            if (
-              result.type === 'highlight_set_entity' &&
-              result?.data?.sequence &&
-              result.data.sequence > this.inSequence
-            ) {
-              this.onHoverCallback(result.data.entity_id)
-              this.inSequence = result.data.sequence
-            }
          })
        })

@ -418,8 +614,8 @@ export class EngineCommandManager {

        mediaStream.getVideoTracks()[0].addEventListener('mute', () => {
          console.log('peer is not sending video to us')
-          this.engineConnection?.close()
-          this.engineConnection?.connect()
+          // this.engineConnection?.close()
+          // this.engineConnection?.connect()
        })

        setMediaStream(mediaStream)
@ -433,30 +629,31 @@ export class EngineCommandManager {
      return
    }
    const modelingResponse = message.data.modeling_response
+    Object.values(this.subscriptions[modelingResponse.type] || {}).forEach(
+      (callback) => callback(modelingResponse)
+    )

    const command = this.artifactMap[id]
-    if (modelingResponse.type === 'select_with_point') {
-      if (modelingResponse?.data?.entity_id) {
-        this.onClickCallback({
-          id: modelingResponse?.data?.entity_id,
-          type: 'default',
-        })
-      } else {
-        this.onClickCallback()
-      }
-    }
    if (command && command.type === 'pending') {
      const resolve = command.resolve
      this.artifactMap[id] = {
        type: 'result',
+        range: command.range,
+        commandType: command.commandType,
+        parentId: command.parentId ? command.parentId : undefined,
        data: modelingResponse,
      }
      resolve({
        id,
+        commandType: command.commandType,
+        range: command.range,
+        data: modelingResponse,
      })
    } else {
      this.artifactMap[id] = {
        type: 'result',
+        commandType: command?.commandType,
+        range: command?.range,
        data: modelingResponse,
      }
    }
@ -468,20 +665,69 @@ export class EngineCommandManager {
    this.artifactMap = {}
    this.sourceRangeMap = {}
  }
+  subscribeTo<T extends ModelTypes>({
+    event,
+    callback,
+  }: Subscription<T>): () => void {
+    const localUnsubscribeId = uuidv4()
+    const otherEventCallbacks = this.subscriptions[event]
+    if (otherEventCallbacks) {
+      otherEventCallbacks[localUnsubscribeId] = callback
+    } else {
+      this.subscriptions[event] = {
+        [localUnsubscribeId]: callback,
+      }
+    }
+    return () => this.unSubscribeTo(event, localUnsubscribeId)
+  }
+  private unSubscribeTo(event: ModelTypes, id: string) {
+    delete this.subscriptions[event][id]
+  }
+  subscribeToUnreliable<T extends UnreliableResponses['type']>({
+    event,
+    callback,
+  }: UnreliableSubscription<T>): () => void {
+    const localUnsubscribeId = uuidv4()
+    const otherEventCallbacks = this.unreliableSubscriptions[event]
+    if (otherEventCallbacks) {
+      otherEventCallbacks[localUnsubscribeId] = callback
+    } else {
+      this.unreliableSubscriptions[event] = {
+        [localUnsubscribeId]: callback,
+      }
+    }
+    return () => this.unSubscribeToUnreliable(event, localUnsubscribeId)
+  }
+  private unSubscribeToUnreliable(
+    event: UnreliableResponses['type'],
+    id: string
+  ) {
+    delete this.unreliableSubscriptions[event][id]
+  }
  endSession() {
-    // this.websocket?.close()
-    // socket.off('command')
-  }
-  onHover(callback: (id?: string) => void) {
-    // It's when the user hovers over a part in the 3d scene, and so the engine should tell the
-    // frontend about that (with it's id) so that the FE can highlight code associated with that id
-    this.onHoverCallback = callback
-  }
-  onClick(callback: (selection?: SelectionsArgs) => void) {
-    // It's when the user clicks on a part in the 3d scene, and so the engine should tell the
-    // frontend about that (with it's id) so that the FE can put the user's cursor on the right
-    // line of code
-    this.onClickCallback = callback
+    // TODO: instead of sending a single command with `object_ids: Object.keys(this.artifactMap)`
+    // we need to loop over them each individualy because if the engine doesn't recognise a single
+    // id the whole command fails.
+    Object.entries(this.artifactMap).forEach(([id, artifact]) => {
+      const artifactTypesToDelete: ArtifactMap[string]['commandType'][] = [
+        // 'start_path' creates a new scene object for the path, which is why it needs to be deleted,
+        // however all of the segments in the path are its children so there don't need to be deleted.
+        // this fact is very opaque in the api and docs (as to what should can be deleted).
+        // Using an array is the list is likely to grow.
+        'start_path',
+      ]
+      if (!artifactTypesToDelete.includes(artifact.commandType)) return
+
+      const deletCmd: EngineCommand = {
+        type: 'modeling_cmd_req',
+        cmd_id: uuidv4(),
+        cmd: {
+          type: 'remove_scene_objects',
+          object_ids: [id],
+        },
+      }
+      this.engineConnection?.send(deletCmd)
+    })
  }
  cusorsSelected(selections: {
    otherSelections: Selections['otherSelections']
@ -507,32 +753,47 @@ export class EngineCommandManager {
      cmd_id: uuidv4(),
    })
  }
-  sendSceneCommand(command: EngineCommand) {
+  sendSceneCommand(command: EngineCommand): Promise<any> {
    if (!this.engineConnection?.isReady()) {
      console.log('socket not ready')
-      return
+      return Promise.resolve()
    }
-    if (command.type !== 'modeling_cmd_req') return
+    if (command.type !== 'modeling_cmd_req') return Promise.resolve()
    const cmd = command.cmd
    if (
      cmd.type === 'camera_drag_move' &&
-      this.engineConnection?.lossyDataChannel
+      this.engineConnection?.unreliableDataChannel
    ) {
      cmd.sequence = this.outSequence
      this.outSequence++
-      this.engineConnection?.lossyDataChannel?.send(JSON.stringify(command))
-      return
+      this.engineConnection?.unreliableDataChannel?.send(
+        JSON.stringify(command)
+      )
+      return Promise.resolve()
    } else if (
      cmd.type === 'highlight_set_entity' &&
-      this.engineConnection?.lossyDataChannel
+      this.engineConnection?.unreliableDataChannel
    ) {
      cmd.sequence = this.outSequence
      this.outSequence++
-      this.engineConnection?.lossyDataChannel?.send(JSON.stringify(command))
-      return
+      this.engineConnection?.unreliableDataChannel?.send(
+        JSON.stringify(command)
+      )
+      return Promise.resolve()
+    } else if (
+      cmd.type === 'mouse_move' &&
+      this.engineConnection.unreliableDataChannel
+    ) {
+      cmd.sequence = this.outSequence
+      this.outSequence++
+      this.engineConnection?.unreliableDataChannel?.send(
+        JSON.stringify(command)
+      )
+      return Promise.resolve()
    }
-    console.log('sending command', command)
+    // since it's not mouse drag or highlighting send over TCP and keep track of the command
    this.engineConnection?.send(command)
+    return this.handlePendingCommand(command.cmd_id, command.cmd)
  }
  sendModelingCommand({
    id,
@ -541,21 +802,44 @@ export class EngineCommandManager {
  }: {
    id: string
    range: SourceRange
-    command: EngineCommand
+    command: EngineCommand | string
  }): Promise<any> {
    this.sourceRangeMap[id] = range

    if (!this.engineConnection?.isReady()) {
      console.log('socket not ready')
-      return new Promise(() => {})
+      return Promise.resolve()
    }
    this.engineConnection?.send(command)
+    if (typeof command !== 'string' && command.type === 'modeling_cmd_req') {
+      return this.handlePendingCommand(id, command?.cmd, range)
+    } else if (typeof command === 'string') {
+      const parseCommand: EngineCommand = JSON.parse(command)
+      if (parseCommand.type === 'modeling_cmd_req')
+        return this.handlePendingCommand(id, parseCommand?.cmd, range)
+    }
+    throw 'shouldnt reach here'
+  }
+  handlePendingCommand(
+    id: string,
+    command: Models['ModelingCmd_type'],
+    range?: SourceRange
+  ) {
    let resolve: (val: any) => void = () => {}
    const promise = new Promise((_resolve, reject) => {
      resolve = _resolve
    })
+    const getParentId = (): string | undefined => {
+      if (command.type === 'extend_path') {
+        return command.path
+      }
+      // TODO handle other commands that have a parent
+    }
    this.artifactMap[id] = {
+      range: range || [0, 0],
      type: 'pending',
+      commandType: command.type,
+      parentId: getParentId(),
      promise,
      resolve,
    }
@ -575,10 +859,9 @@ export class EngineCommandManager {
    if (commandStr === undefined) {
      throw new Error('commandStr is undefined')
    }
-    const command: EngineCommand = JSON.parse(commandStr)
    const range: SourceRange = JSON.parse(rangeStr)

-    return this.sendModelingCommand({ id, range, command })
+    return this.sendModelingCommand({ id, range, command: commandStr })
  }
  commandResult(id: string): Promise<any> {
    const command = this.artifactMap[id]
--- a/src/lang/std/sketch.test.ts
+++ b/src/lang/std/sketch.test.ts
@ -97,11 +97,10 @@ describe('testing changeSketchArguments', () => {
  const lineAfterChange = 'lineTo([2, 3], %)'
  test('changeSketchArguments', async () => {
    // Enable rotations #152
-    const genCode = (line: string) => `
-const mySketch001 = startSketchAt([0, 0])
-    |> ${line}
-    |> lineTo([0.46, -5.82], %)
-    // |> rx(45, %)
+    const genCode = (line: string) => `const mySketch001 = startSketchAt([0, 0])
+  |> ${line}
+  |> lineTo([0.46, -5.82], %)
+// |> rx(45, %)
 show(mySketch001)`
    const code = genCode(lineToChange)
    const expectedCode = genCode(lineAfterChange)
@ -160,8 +159,7 @@ show(mySketch001)`
      ],
    })
    // Enable rotations #152
-    const expectedCode = `
-const mySketch001 = startSketchAt([0, 0])
+    const expectedCode = `const mySketch001 = startSketchAt([0, 0])
  // |> rx(45, %)
  |> lineTo([-1.59, -1.54], %)
  |> lineTo([0.46, -5.82], %)
@ -175,12 +173,11 @@ describe('testing addTagForSketchOnFace', () => {
  it('needs to be in it', async () => {
    const originalLine = 'lineTo([-1.59, -1.54], %)'
    // Enable rotations #152
-    const genCode = (line: string) => `
-  const mySketch001 = startSketchAt([0, 0])
-    // |> rx(45, %)
-    |> ${line}
-    |> lineTo([0.46, -5.82], %)
-  show(mySketch001)`
+    const genCode = (line: string) => `const mySketch001 = startSketchAt([0, 0])
+  // |> rx(45, %)
+  |> ${line}
+  |> lineTo([0.46, -5.82], %)
+show(mySketch001)`
    const code = genCode(originalLine)
    const ast = parser_wasm(code)
    const programMemory = await enginelessExecutor(ast)
--- a/src/lang/std/sketchConstraints.test.ts
+++ b/src/lang/std/sketchConstraints.test.ts
@ -59,20 +59,20 @@ describe('testing swaping out sketch calls with xLine/xLineTo', () => {
    `  |> lineTo({ to: [1, 1], tag: 'abc1' }, %)`,
    `  |> line({ to: [-2.04, -0.7], tag: 'abc2' }, %)`,
    `  |> angledLine({`,
-    `      angle: 157,`,
-    `      length: 1.69,`,
-    `      tag: 'abc3'`,
-    `    }, %)`,
+    `       angle: 157,`,
+    `       length: 1.69,`,
+    `       tag: 'abc3'`,
+    `     }, %)`,
    `  |> angledLineOfXLength({`,
-    `      angle: 217,`,
-    `      length: 0.86,`,
-    `      tag: 'abc4'`,
-    `    }, %)`,
+    `       angle: 217,`,
+    `       length: 0.86,`,
+    `       tag: 'abc4'`,
+    `     }, %)`,
    `  |> angledLineOfYLength({`,
-    `      angle: 104,`,
-    `      length: 1.58,`,
-    `      tag: 'abc5'`,
-    `    }, %)`,
+    `       angle: 104,`,
+    `       length: 1.58,`,
+    `       tag: 'abc5'`,
+    `     }, %)`,
    `  |> angledLineToX({ angle: 55, to: -2.89, tag: 'abc6' }, %)`,
    `  |> angledLineToY({ angle: 330, to: 2.53, tag: 'abc7' }, %)`,
    `  |> xLine({ length: 1.47, tag: 'abc8' }, %)`,
@ -144,10 +144,10 @@ describe('testing swaping out sketch calls with xLine/xLineTo', () => {
      inputCode: bigExample,
      callToSwap: [
        `angledLine({`,
-        `      angle: 157,`,
-        `      length: 1.69,`,
-        `      tag: 'abc3'`,
-        `    }, %)`,
+        `       angle: 157,`,
+        `       length: 1.69,`,
+        `       tag: 'abc3'`,
+        `     }, %)`,
      ].join('\n'),
      constraintType: 'horizontal',
    })
@ -172,10 +172,10 @@ describe('testing swaping out sketch calls with xLine/xLineTo', () => {
      inputCode: bigExample,
      callToSwap: [
        `angledLineOfXLength({`,
-        `      angle: 217,`,
-        `      length: 0.86,`,
-        `      tag: 'abc4'`,
-        `    }, %)`,
+        `       angle: 217,`,
+        `       length: 0.86,`,
+        `       tag: 'abc4'`,
+        `     }, %)`,
      ].join('\n'),
      constraintType: 'horizontal',
    })
@ -201,10 +201,10 @@ describe('testing swaping out sketch calls with xLine/xLineTo', () => {
      inputCode: bigExample,
      callToSwap: [
        `angledLineOfYLength({`,
-        `      angle: 104,`,
-        `      length: 1.58,`,
-        `      tag: 'abc5'`,
-        `    }, %)`,
+        `       angle: 104,`,
+        `       length: 1.58,`,
+        `       tag: 'abc5'`,
+        `     }, %)`,
      ].join('\n'),
      constraintType: 'vertical',
    })
--- a/src/lang/std/sketchcombos.test.ts
+++ b/src/lang/std/sketchcombos.test.ts
@ -133,64 +133,64 @@ const myAng2 = 134
 const part001 = startSketchAt([0, 0])
  |> line({ to: [1, 3.82], tag: 'seg01' }, %) // ln-should-get-tag
  |> angledLineToX([
-      -angleToMatchLengthX('seg01', myVar, %),
-      myVar
-    ], %) // ln-lineTo-xAbsolute should use angleToMatchLengthX helper
+       -angleToMatchLengthX('seg01', myVar, %),
+       myVar
+     ], %) // ln-lineTo-xAbsolute should use angleToMatchLengthX helper
  |> angledLineToY([
-      -angleToMatchLengthY('seg01', myVar, %),
-      myVar
-    ], %) // ln-lineTo-yAbsolute should use angleToMatchLengthY helper
+       -angleToMatchLengthY('seg01', myVar, %),
+       myVar
+     ], %) // ln-lineTo-yAbsolute should use angleToMatchLengthY helper
  |> angledLine([45, segLen('seg01', %)], %) // ln-lineTo-free should become angledLine
  |> angledLine([45, segLen('seg01', %)], %) // ln-angledLineToX-free should become angledLine
  |> angledLine([myAng, segLen('seg01', %)], %) // ln-angledLineToX-angle should become angledLine
  |> angledLineToX([
-      angleToMatchLengthX('seg01', myVar2, %),
-      myVar2
-    ], %) // ln-angledLineToX-xAbsolute should use angleToMatchLengthX to get angle
+       angleToMatchLengthX('seg01', myVar2, %),
+       myVar2
+     ], %) // ln-angledLineToX-xAbsolute should use angleToMatchLengthX to get angle
  |> angledLine([-45, segLen('seg01', %)], %) // ln-angledLineToY-free should become angledLine
  |> angledLine([myAng2, segLen('seg01', %)], %) // ln-angledLineToY-angle should become angledLine
  |> angledLineToY([
-      angleToMatchLengthY('seg01', myVar3, %),
-      myVar3
-    ], %) // ln-angledLineToY-yAbsolute should use angleToMatchLengthY to get angle
+       angleToMatchLengthY('seg01', myVar3, %),
+       myVar3
+     ], %) // ln-angledLineToY-yAbsolute should use angleToMatchLengthY to get angle
  |> line([
-      min(segLen('seg01', %), myVar),
-      legLen(segLen('seg01', %), myVar)
-    ], %) // ln-should use legLen for y
+       min(segLen('seg01', %), myVar),
+       legLen(segLen('seg01', %), myVar)
+     ], %) // ln-should use legLen for y
  |> line([
-      min(segLen('seg01', %), myVar),
-      -legLen(segLen('seg01', %), myVar)
-    ], %) // ln-legLen but negative
+       min(segLen('seg01', %), myVar),
+       -legLen(segLen('seg01', %), myVar)
+     ], %) // ln-legLen but negative
  |> angledLine([-112, segLen('seg01', %)], %) // ln-should become angledLine
  |> angledLine([myVar, segLen('seg01', %)], %) // ln-use segLen for secound arg
  |> angledLine([45, segLen('seg01', %)], %) // ln-segLen again
  |> angledLine([54, segLen('seg01', %)], %) // ln-should be transformed to angledLine
  |> angledLineOfXLength([
-      legAngX(segLen('seg01', %), myVar),
-      min(segLen('seg01', %), myVar)
-    ], %) // ln-should use legAngX to calculate angle
+       legAngX(segLen('seg01', %), myVar),
+       min(segLen('seg01', %), myVar)
+     ], %) // ln-should use legAngX to calculate angle
  |> angledLineOfXLength([
-      180 + legAngX(segLen('seg01', %), myVar),
-      min(segLen('seg01', %), myVar)
-    ], %) // ln-same as above but should have + 180 to match original quadrant
+       180 + legAngX(segLen('seg01', %), myVar),
+       min(segLen('seg01', %), myVar)
+     ], %) // ln-same as above but should have + 180 to match original quadrant
  |> line([
-      legLen(segLen('seg01', %), myVar),
-      min(segLen('seg01', %), myVar)
-    ], %) // ln-legLen again but yRelative
+       legLen(segLen('seg01', %), myVar),
+       min(segLen('seg01', %), myVar)
+     ], %) // ln-legLen again but yRelative
  |> line([
-      -legLen(segLen('seg01', %), myVar),
-      min(segLen('seg01', %), myVar)
-    ], %) // ln-negative legLen yRelative
+       -legLen(segLen('seg01', %), myVar),
+       min(segLen('seg01', %), myVar)
+     ], %) // ln-negative legLen yRelative
  |> angledLine([58, segLen('seg01', %)], %) // ln-angledLineOfYLength-free should become angledLine
  |> angledLine([myAng, segLen('seg01', %)], %) // ln-angledLineOfYLength-angle should become angledLine
  |> angledLineOfXLength([
-      legAngY(segLen('seg01', %), myVar),
-      min(segLen('seg01', %), myVar)
-    ], %) // ln-angledLineOfYLength-yRelative use legAngY
+       legAngY(segLen('seg01', %), myVar),
+       min(segLen('seg01', %), myVar)
+     ], %) // ln-angledLineOfYLength-yRelative use legAngY
  |> angledLineOfXLength([
-      270 + legAngY(segLen('seg01', %), myVar),
-      min(segLen('seg01', %), myVar)
-    ], %) // ln-angledLineOfYLength-yRelative with angle > 90 use binExp
+       270 + legAngY(segLen('seg01', %), myVar),
+       min(segLen('seg01', %), myVar)
+     ], %) // ln-angledLineOfYLength-yRelative with angle > 90 use binExp
  |> xLine(segLen('seg01', %), %) // ln-xLine-free should sub in segLen
  |> yLine(segLen('seg01', %), %) // ln-yLine-free should sub in segLen
  |> xLine(segLen('seg01', %), %) // ln-xLineTo-free should convert to xLine
@ -406,9 +406,9 @@ show(part001)`
        'setVertDistance'
      )
      expect(expectedCode).toContain(`|> lineTo([
-      lastSegX(%) + myVar,
-      segEndY('seg01', %) + 2.93
-    ], %) // xRelative`)
+       lastSegX(%) + myVar,
+       segEndY('seg01', %) + 2.93
+     ], %) // xRelative`)
    })
    it('testing for yRelative to horizontal distance', async () => {
      const expectedCode = await helperThing(
@ -417,9 +417,9 @@ show(part001)`
        'setHorzDistance'
      )
      expect(expectedCode).toContain(`|> lineTo([
-      segEndX('seg01', %) + 2.6,
-      lastSegY(%) + myVar
-    ], %) // yRelative`)
+       segEndX('seg01', %) + 2.6,
+       lastSegY(%) + myVar
+     ], %) // yRelative`)
    })
  })
 })
--- a/src/lang/tokeniser.test.ts
+++ b/src/lang/tokeniser.test.ts
@ -110,7 +110,7 @@ const yi=45`
      "brace        ')'        from 17  to 18",
    ])
    expect(stringSummaryLexer('fn funcName = (param1, param2) => {}')).toEqual([
-      "word         'fn'       from 0   to 2",
+      "keyword      'fn'       from 0   to 2",
      "whitespace   ' '        from 2   to 3",
      "word         'funcName' from 3   to 11",
      "whitespace   ' '        from 11  to 12",
@ -203,7 +203,7 @@ const yi=45`
  it('testing array declaration', () => {
    const result = stringSummaryLexer(`const yo = [1, 2]`)
    expect(result).toEqual([
-      "word         'const'    from 0   to 5",
+      "keyword      'const'    from 0   to 5",
      "whitespace   ' '        from 5   to 6",
      "word         'yo'       from 6   to 8",
      "whitespace   ' '        from 8   to 9",
@ -220,7 +220,7 @@ const yi=45`
  it('testing object declaration', () => {
    const result = stringSummaryLexer(`const yo = {key: 'value'}`)
    expect(result).toEqual([
-      "word         'const'    from 0   to 5",
+      "keyword      'const'    from 0   to 5",
      "whitespace   ' '        from 5   to 6",
      "word         'yo'       from 6   to 8",
      "whitespace   ' '        from 8   to 9",
@ -241,7 +241,7 @@ const prop2 = yo['key']
 const key = 'key'
 const prop3 = yo[key]`)
    expect(result).toEqual([
-      "word         'const'    from 0   to 5",
+      "keyword      'const'    from 0   to 5",
      "whitespace   ' '        from 5   to 6",
      "word         'yo'       from 6   to 8",
      "whitespace   ' '        from 8   to 9",
@ -254,7 +254,7 @@ const prop3 = yo[key]`)
      "string       ''value''  from 17  to 24",
      "brace        '}'        from 24  to 25",
      "whitespace   '\n'        from 25  to 26",
-      "word         'const'    from 26  to 31",
+      "keyword      'const'    from 26  to 31",
      "whitespace   ' '        from 31  to 32",
      "word         'prop'     from 32  to 36",
      "whitespace   ' '        from 36  to 37",
@ -264,7 +264,7 @@ const prop3 = yo[key]`)
      "period       '.'        from 41  to 42",
      "word         'key'      from 42  to 45",
      "whitespace   '\n'        from 45  to 46",
-      "word         'const'    from 46  to 51",
+      "keyword      'const'    from 46  to 51",
      "whitespace   ' '        from 51  to 52",
      "word         'prop2'    from 52  to 57",
      "whitespace   ' '        from 57  to 58",
@ -275,7 +275,7 @@ const prop3 = yo[key]`)
      "string       ''key''    from 63  to 68",
      "brace        ']'        from 68  to 69",
      "whitespace   '\n'        from 69  to 70",
-      "word         'const'    from 70  to 75",
+      "keyword      'const'    from 70  to 75",
      "whitespace   ' '        from 75  to 76",
      "word         'key'      from 76  to 79",
      "whitespace   ' '        from 79  to 80",
@ -283,7 +283,7 @@ const prop3 = yo[key]`)
      "whitespace   ' '        from 81  to 82",
      "string       ''key''    from 82  to 87",
      "whitespace   '\n'        from 87  to 88",
-      "word         'const'    from 88  to 93",
+      "keyword      'const'    from 88  to 93",
      "whitespace   ' '        from 93  to 94",
      "word         'prop3'    from 94  to 99",
      "whitespace   ' '        from 99  to 100",
@ -299,7 +299,7 @@ const prop3 = yo[key]`)
    const result = stringSummaryLexer(`const yo = 45 // this is a comment
 const yo = 6`)
    expect(result).toEqual([
-      "word         'const'    from 0   to 5",
+      "keyword      'const'    from 0   to 5",
      "whitespace   ' '        from 5   to 6",
      "word         'yo'       from 6   to 8",
      "whitespace   ' '        from 8   to 9",
@ -307,9 +307,9 @@ const yo = 6`)
      "whitespace   ' '        from 10  to 11",
      "number       '45'       from 11  to 13",
      "whitespace   ' '        from 13  to 14",
-      "linecomment  '// this is a comment' from 14  to 34",
+      "lineComment  '// this is a comment' from 14  to 34",
      "whitespace   '\n'        from 34  to 35",
-      "word         'const'    from 35  to 40",
+      "keyword      'const'    from 35  to 40",
      "whitespace   ' '        from 40  to 41",
      "word         'yo'       from 41  to 43",
      "whitespace   ' '        from 43  to 44",
@ -328,9 +328,9 @@ const yo=45`)
      "string       ''hi''     from 4   to 8",
      "brace        ')'        from 8   to 9",
      "whitespace   '\n'        from 9   to 10",
-      "linecomment  '// comment on a line by itself' from 10  to 40",
+      "lineComment  '// comment on a line by itself' from 10  to 40",
      "whitespace   '\n'        from 40  to 41",
-      "word         'const'    from 41  to 46",
+      "keyword      'const'    from 41  to 46",
      "whitespace   ' '        from 46  to 47",
      "word         'yo'       from 47  to 49",
      "operator     '='        from 49  to 50",
@ -342,7 +342,7 @@ const yo=45`)
 const ya = 6 */
 const yi=45`)
    expect(result).toEqual([
-      "word         'const'    from 0   to 5",
+      "keyword      'const'    from 0   to 5",
      "whitespace   ' '        from 5   to 6",
      "word         'yo'       from 6   to 8",
      "whitespace   ' '        from 8   to 9",
@ -350,10 +350,10 @@ const yi=45`)
      "whitespace   ' '        from 10  to 11",
      "number       '45'       from 11  to 13",
      "whitespace   ' '        from 13  to 14",
-      `blockcomment '/* this is a comment
+      `blockComment '/* this is a comment
 const ya = 6 */' from 14  to 50`,
      "whitespace   '\n'        from 50  to 51",
-      "word         'const'    from 51  to 56",
+      "keyword      'const'    from 51  to 56",
      "whitespace   ' '        from 56  to 57",
      "word         'yi'       from 57  to 59",
      "operator     '='        from 59  to 60",
--- a/src/lib/cameraControls.ts
+++ b/src/lib/cameraControls.ts
@ -0,0 +1,133 @@
+const noModifiersPressed = (e: React.MouseEvent) =>
+  !e.ctrlKey && !e.shiftKey && !e.altKey && !e.metaKey
+
+export type CADProgram =
+  | 'KittyCAD'
+  | 'OnShape'
+  | 'Solidworks'
+  | 'NX'
+  | 'Creo'
+  | 'AutoCAD'
+
+export const cadPrograms: CADProgram[] = [
+  'KittyCAD',
+  'OnShape',
+  'Solidworks',
+  'NX',
+  'Creo',
+  'AutoCAD',
+]
+
+interface MouseGuardHandler {
+  description: string
+  callback: (e: React.MouseEvent) => boolean
+}
+
+interface MouseGuardZoomHandler {
+  description: string
+  dragCallback: (e: React.MouseEvent) => boolean
+  scrollCallback: (e: React.MouseEvent) => boolean
+}
+
+interface MouseGuard {
+  pan: MouseGuardHandler
+  zoom: MouseGuardZoomHandler
+  rotate: MouseGuardHandler
+}
+
+export const cameraMouseDragGuards: Record<CADProgram, MouseGuard> = {
+  KittyCAD: {
+    pan: {
+      description: 'Right click + Shift + drag or middle click + drag',
+      callback: (e) =>
+        (e.button === 3 && noModifiersPressed(e)) ||
+        (e.button === 2 && e.shiftKey),
+    },
+    zoom: {
+      description: 'Scroll wheel or Right click + Ctrl + drag',
+      dragCallback: (e) => e.button === 2 && e.ctrlKey,
+      scrollCallback: () => true,
+    },
+    rotate: {
+      description: 'Right click + drag',
+      callback: (e) => e.button === 2 && noModifiersPressed(e),
+    },
+  },
+  OnShape: {
+    pan: {
+      description: 'Right click + Ctrl + drag or middle click + drag',
+      callback: (e) =>
+        (e.button === 2 && e.ctrlKey) ||
+        (e.button === 3 && noModifiersPressed(e)),
+    },
+    zoom: {
+      description: 'Scroll wheel',
+      dragCallback: () => false,
+      scrollCallback: () => true,
+    },
+    rotate: {
+      description: 'Right click + drag',
+      callback: (e) => e.button === 2 && noModifiersPressed(e),
+    },
+  },
+  Solidworks: {
+    pan: {
+      description: 'Right click + Ctrl + drag',
+      callback: (e) => e.button === 2 && e.ctrlKey,
+    },
+    zoom: {
+      description: 'Scroll wheel or Middle click + Shift + drag',
+      dragCallback: (e) => e.button === 3 && e.shiftKey,
+      scrollCallback: () => true,
+    },
+    rotate: {
+      description: 'Middle click + drag',
+      callback: (e) => e.button === 3 && noModifiersPressed(e),
+    },
+  },
+  NX: {
+    pan: {
+      description: 'Middle click + Shift + drag',
+      callback: (e) => e.button === 3 && e.shiftKey,
+    },
+    zoom: {
+      description: 'Scroll wheel or Middle click + Ctrl + drag',
+      dragCallback: (e) => e.button === 3 && e.ctrlKey,
+      scrollCallback: () => true,
+    },
+    rotate: {
+      description: 'Middle click + drag',
+      callback: (e) => e.button === 3 && noModifiersPressed(e),
+    },
+  },
+  Creo: {
+    pan: {
+      description: 'Middle click + Shift + drag',
+      callback: (e) => e.button === 3 && e.shiftKey,
+    },
+    zoom: {
+      description: 'Scroll wheel or Middle click + Ctrl + drag',
+      dragCallback: (e) => e.button === 3 && e.ctrlKey,
+      scrollCallback: () => true,
+    },
+    rotate: {
+      description: 'Middle click + drag',
+      callback: (e) => e.button === 3 && noModifiersPressed(e),
+    },
+  },
+  AutoCAD: {
+    pan: {
+      description: 'Middle click + drag',
+      callback: (e) => e.button === 3 && noModifiersPressed(e),
+    },
+    zoom: {
+      description: 'Scroll wheel',
+      dragCallback: () => false,
+      scrollCallback: () => true,
+    },
+    rotate: {
+      description: 'Middle click + Shift + drag',
+      callback: (e) => e.button === 3 && e.shiftKey,
+    },
+  },
+}
--- a/src/lib/commands.ts
+++ b/src/lib/commands.ts
@ -73,8 +73,6 @@ export function createMachineCommand<T extends AnyStateMachine>({
        arg.defaultValue as keyof typeof state.context
      ] as string | undefined

-      console.log(arg.name, { defaultValueFromContext })
-
      const options =
        arg.options instanceof Array
          ? arg.options.map((o) => ({
--- a/src/lib/testHelpers.ts
+++ b/src/lib/testHelpers.ts
@ -39,7 +39,6 @@ class MockEngineCommandManager {
    if (commandStr === undefined) {
      throw new Error('commandStr is undefined')
    }
-    console.log('sendModelingCommandFromWasm', id, rangeStr, commandStr)
    const command: EngineCommand = JSON.parse(commandStr)
    const range: SourceRange = JSON.parse(rangeStr)

--- a/src/lib/theme.ts
+++ b/src/lib/theme.ts
@ -4,17 +4,18 @@ export enum Themes {
  System = 'system',
 }

+// Get the theme from the system settings manually
 export function getSystemTheme(): Exclude<Themes, 'system'> {
-  return typeof window !== 'undefined' &&
-    'matchMedia' in window &&
-    window.matchMedia('(prefers-color-scheme: dark)').matches
-    ? Themes.Dark
+  return typeof window !== 'undefined' && 'matchMedia' in window
+    ? window.matchMedia('(prefers-color-scheme: dark)').matches
+      ? Themes.Dark
+      : Themes.Light
    : Themes.Light
 }

+// Set the theme class on the body element
 export function setThemeClass(theme: Themes) {
-  const systemTheme = theme === Themes.System && getSystemTheme()
-  if (theme === Themes.Dark || systemTheme === Themes.Dark) {
+  if (theme === Themes.Dark) {
    document.body.classList.add('dark')
  } else {
    document.body.classList.remove('dark')
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@ -56,6 +56,27 @@ export function throttle<T>(
  return throttled
 }

+// takes a function and executes it after the wait time, if the function is called again before the wait time is up, the timer is reset
+export function defferExecution<T>(func: (args: T) => any, wait: number) {
+  let timeout: ReturnType<typeof setTimeout> | null
+  let latestArgs: T
+
+  function later() {
+    timeout = null
+    func(latestArgs)
+  }
+
+  function deffered(args: T) {
+    latestArgs = args
+    if (timeout) {
+      clearTimeout(timeout)
+    }
+    timeout = setTimeout(later, wait)
+  }
+
+  return deffered
+}
+
 export function getNormalisedCoordinates({
  clientX,
  clientY,
--- a/src/machines/authMachine.ts
+++ b/src/machines/authMachine.ts
@ -3,6 +3,23 @@ import { Models } from '@kittycad/lib'
 import withBaseURL from '../lib/withBaseURL'
 import { CommandBarMeta } from '../lib/commands'

+const SKIP_AUTH =
+  import.meta.env.VITE_KC_SKIP_AUTH === 'true' && import.meta.env.DEV
+const LOCAL_USER: Models['User_type'] = {
+  id: '8675309',
+  name: 'Test User',
+  email: 'kittycad.sidebar.test@example.com',
+  image: 'https://placekitten.com/200/200',
+  created_at: 'yesteryear',
+  updated_at: 'today',
+  company: 'Test Company',
+  discord: 'Test User#1234',
+  github: 'testuser',
+  phone: '555-555-5555',
+  first_name: 'Test',
+  last_name: 'User',
+}
+
 export interface UserContext {
  user?: Models['User_type']
  token?: string
@ -81,7 +98,9 @@ export const authMachine = createMachine<UserContext, Events>(
    schema: { events: {} as { type: 'Log out' } | { type: 'Log in' } },
    predictableActionArguments: true,
    preserveActionOrder: true,
-    context: { token: persistedToken },
+    context: {
+      token: persistedToken,
+    },
  },
  {
    actions: {},
@ -98,6 +117,7 @@ async function getUser(context: UserContext) {
  }
  if (!context.token && '__TAURI__' in window) throw 'not log in'
  if (context.token) headers['Authorization'] = `Bearer ${context.token}`
+  if (SKIP_AUTH) return LOCAL_USER
  try {
    const response = await fetch(url, {
      method: 'GET',
--- a/src/machines/settingsMachine.ts
+++ b/src/machines/settingsMachine.ts
@ -1,24 +1,54 @@
 import { assign, createMachine } from 'xstate'
-import { BaseUnit, baseUnitsUnion } from '../useStore'
 import { CommandBarMeta } from '../lib/commands'
-import { Themes } from '../lib/theme'
+import { Themes, getSystemTheme, setThemeClass } from '../lib/theme'
+import { CADProgram, cadPrograms } from 'lib/cameraControls'
+
+export const DEFAULT_PROJECT_NAME = 'project-$nnn'
+
+export enum UnitSystem {
+  Imperial = 'imperial',
+  Metric = 'metric',
+}
+
+export const baseUnits = {
+  imperial: ['in', 'ft'],
+  metric: ['mm', 'cm', 'm'],
+} as const
+
+export type BaseUnit = 'in' | 'ft' | 'mm' | 'cm' | 'm'
+
+export const baseUnitsUnion = Object.values(baseUnits).flatMap((v) => v)
+
+export type Toggle = 'On' | 'Off'

 export const SETTINGS_PERSIST_KEY = 'SETTINGS_PERSIST_KEY'

 export const settingsCommandBarMeta: CommandBarMeta = {
-  'Set Theme': {
-    displayValue: (args: string[]) => 'Change the app theme',
+  'Set Base Unit': {
+    displayValue: (args: string[]) => 'Set your default base unit',
    args: [
      {
-        name: 'theme',
+        name: 'baseUnit',
        type: 'select',
-        defaultValue: 'theme',
-        options: Object.values(Themes).map((v) => ({ name: v })) as {
-          name: string
-        }[],
+        defaultValue: 'baseUnit',
+        options: Object.values(baseUnitsUnion).map((v) => ({ name: v })),
      },
    ],
  },
+  'Set Camera Controls': {
+    displayValue: (args: string[]) => 'Set your camera controls',
+    args: [
+      {
+        name: 'cameraControls',
+        type: 'select',
+        defaultValue: 'cameraControls',
+        options: Object.values(cadPrograms).map((v) => ({ name: v })),
+      },
+    ],
+  },
+  'Set Default Directory': {
+    hide: 'both',
+  },
  'Set Default Project Name': {
    displayValue: (args: string[]) => 'Set a new default project name',
    hide: 'web',
@ -32,9 +62,33 @@ export const settingsCommandBarMeta: CommandBarMeta = {
      },
    ],
  },
-  'Set Default Directory': {
+  'Set Onboarding Status': {
    hide: 'both',
  },
+  'Set Text Wrapping': {
+    displayValue: (args: string[]) => 'Set whether text in the editor wraps',
+    args: [
+      {
+        name: 'textWrapping',
+        type: 'select',
+        defaultValue: 'textWrapping',
+        options: [{ name: 'On' }, { name: 'Off' }],
+      },
+    ],
+  },
+  'Set Theme': {
+    displayValue: (args: string[]) => 'Change the app theme',
+    args: [
+      {
+        name: 'theme',
+        type: 'select',
+        defaultValue: 'theme',
+        options: Object.values(Themes).map((v): { name: string } => ({
+          name: v,
+        })),
+      },
+    ],
+  },
  'Set Unit System': {
    displayValue: (args: string[]) => 'Set your default unit system',
    args: [
@ -42,24 +96,10 @@ export const settingsCommandBarMeta: CommandBarMeta = {
        name: 'unitSystem',
        type: 'select',
        defaultValue: 'unitSystem',
-        options: [{ name: 'imperial' }, { name: 'metric' }],
+        options: [{ name: UnitSystem.Imperial }, { name: UnitSystem.Metric }],
      },
    ],
  },
-  'Set Base Unit': {
-    displayValue: (args: string[]) => 'Set your default base unit',
-    args: [
-      {
-        name: 'baseUnit',
-        type: 'select',
-        defaultValue: 'baseUnit',
-        options: Object.values(baseUnitsUnion).map((v) => ({ name: v })),
-      },
-    ],
-  },
-  'Set Onboarding Status': {
-    hide: 'both',
-  },
 }

 export const settingsMachine = createMachine(
@ -68,33 +108,34 @@ export const settingsMachine = createMachine(
    id: 'Settings',
    predictableActionArguments: true,
    context: {
-      theme: Themes.System,
-      defaultProjectName: '',
-      unitSystem: 'imperial' as 'imperial' | 'metric',
      baseUnit: 'in' as BaseUnit,
+      cameraControls: 'KittyCAD' as CADProgram,
      defaultDirectory: '',
-      showDebugPanel: false,
+      defaultProjectName: DEFAULT_PROJECT_NAME,
      onboardingStatus: '',
+      showDebugPanel: false,
+      textWrapping: 'On' as Toggle,
+      theme: Themes.System,
+      unitSystem: UnitSystem.Imperial,
    },
    initial: 'idle',
    states: {
      idle: {
+        entry: ['setThemeClass'],
        on: {
-          'Set Theme': {
+          'Set Base Unit': {
            actions: [
-              assign({
-                theme: (_, event) => event.data.theme,
-              }),
+              assign({ baseUnit: (_, event) => event.data.baseUnit }),
              'persistSettings',
              'toastSuccess',
            ],
            target: 'idle',
            internal: true,
          },
-          'Set Default Project Name': {
+          'Set Camera Controls': {
            actions: [
              assign({
-                defaultProjectName: (_, event) => event.data.defaultProjectName,
+                cameraControls: (_, event) => event.data.cameraControls,
              }),
              'persistSettings',
              'toastSuccess',
@ -113,12 +154,11 @@ export const settingsMachine = createMachine(
            target: 'idle',
            internal: true,
          },
-          'Set Unit System': {
+          'Set Default Project Name': {
            actions: [
              assign({
-                unitSystem: (_, event) => event.data.unitSystem,
-                baseUnit: (_, event) =>
-                  event.data.unitSystem === 'imperial' ? 'in' : 'mm',
+                defaultProjectName: (_, event) =>
+                  event.data.defaultProjectName.trim() || DEFAULT_PROJECT_NAME,
              }),
              'persistSettings',
              'toastSuccess',
@ -126,9 +166,46 @@ export const settingsMachine = createMachine(
            target: 'idle',
            internal: true,
          },
-          'Set Base Unit': {
+          'Set Onboarding Status': {
            actions: [
-              assign({ baseUnit: (_, event) => event.data.baseUnit }),
+              assign({
+                onboardingStatus: (_, event) => event.data.onboardingStatus,
+              }),
+              'persistSettings',
+            ],
+            target: 'idle',
+            internal: true,
+          },
+          'Set Text Wrapping': {
+            actions: [
+              assign({
+                textWrapping: (_, event) => event.data.textWrapping,
+              }),
+              'persistSettings',
+              'toastSuccess',
+            ],
+            target: 'idle',
+            internal: true,
+          },
+          'Set Theme': {
+            actions: [
+              assign({
+                theme: (_, event) => event.data.theme,
+              }),
+              'persistSettings',
+              'toastSuccess',
+              'setThemeClass',
+            ],
+            target: 'idle',
+            internal: true,
+          },
+          'Set Unit System': {
+            actions: [
+              assign({
+                unitSystem: (_, event) => event.data.unitSystem,
+                baseUnit: (_, event) =>
+                  event.data.unitSystem === 'imperial' ? 'in' : 'mm',
+              }),
              'persistSettings',
              'toastSuccess',
            ],
@ -148,34 +225,26 @@ export const settingsMachine = createMachine(
            target: 'idle',
            internal: true,
          },
-          'Set Onboarding Status': {
-            actions: [
-              assign({
-                onboardingStatus: (_, event) => event.data.onboardingStatus,
-              }),
-              'persistSettings',
-            ],
-            target: 'idle',
-            internal: true,
-          },
        },
      },
    },
    tsTypes: {} as import('./settingsMachine.typegen').Typegen0,
    schema: {
      events: {} as
-        | { type: 'Set Theme'; data: { theme: Themes } }
+        | { type: 'Set Base Unit'; data: { baseUnit: BaseUnit } }
+        | { type: 'Set Camera Controls'; data: { cameraControls: CADProgram } }
+        | { type: 'Set Default Directory'; data: { defaultDirectory: string } }
        | {
            type: 'Set Default Project Name'
            data: { defaultProjectName: string }
          }
-        | { type: 'Set Default Directory'; data: { defaultDirectory: string } }
+        | { type: 'Set Onboarding Status'; data: { onboardingStatus: string } }
+        | { type: 'Set Text Wrapping'; data: { textWrapping: Toggle } }
+        | { type: 'Set Theme'; data: { theme: Themes } }
        | {
            type: 'Set Unit System'
-            data: { unitSystem: 'imperial' | 'metric' }
+            data: { unitSystem: UnitSystem }
          }
-        | { type: 'Set Base Unit'; data: { baseUnit: BaseUnit } }
-        | { type: 'Set Onboarding Status'; data: { onboardingStatus: string } }
        | { type: 'Toggle Debug Panel' },
    },
  },
@ -188,6 +257,13 @@ export const settingsMachine = createMachine(
          console.error(e)
        }
      },
+      setThemeClass: (context, event) => {
+        const currentTheme =
+          event.type === 'Set Theme' ? event.data.theme : context.theme
+        setThemeClass(
+          currentTheme === Themes.System ? getSystemTheme() : currentTheme
+        )
+      },
    },
  }
 )
--- a/src/machines/settingsMachine.typegen.ts
+++ b/src/machines/settingsMachine.typegen.ts
@ -15,16 +15,31 @@ export interface Typegen0 {
  eventsCausingActions: {
    persistSettings:
      | 'Set Base Unit'
+      | 'Set Camera Controls'
      | 'Set Default Directory'
      | 'Set Default Project Name'
      | 'Set Onboarding Status'
+      | 'Set Text Wrapping'
      | 'Set Theme'
      | 'Set Unit System'
      | 'Toggle Debug Panel'
-    toastSuccess:
+    setThemeClass:
      | 'Set Base Unit'
+      | 'Set Camera Controls'
      | 'Set Default Directory'
      | 'Set Default Project Name'
+      | 'Set Onboarding Status'
+      | 'Set Text Wrapping'
+      | 'Set Theme'
+      | 'Set Unit System'
+      | 'Toggle Debug Panel'
+      | 'xstate.init'
+    toastSuccess:
+      | 'Set Base Unit'
+      | 'Set Camera Controls'
+      | 'Set Default Directory'
+      | 'Set Default Project Name'
+      | 'Set Text Wrapping'
      | 'Set Theme'
      | 'Set Unit System'
      | 'Toggle Debug Panel'
--- a/src/routes/Home.tsx
+++ b/src/routes/Home.tsx
@ -28,6 +28,7 @@ import {
 import useStateMachineCommands from '../hooks/useStateMachineCommands'
 import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
 import { useCommandsContext } from 'hooks/useCommandsContext'
+import { DEFAULT_PROJECT_NAME } from 'machines/settingsMachine'

 // This route only opens in the Tauri desktop context for now,
 // as defined in Router.tsx, so we can use the Tauri APIs and types.
@ -38,6 +39,7 @@ const Home = () => {
  const {
    settings: {
      context: { defaultDirectory, defaultProjectName },
+      send: sendToSettings,
    },
  } = useGlobalStateContext()

@ -71,16 +73,33 @@ const Home = () => {
        context: ContextFrom<typeof homeMachine>,
        event: EventFrom<typeof homeMachine, 'Create project'>
      ) => {
-        let name =
+        let name = (
          event.data && 'name' in event.data
            ? event.data.name
            : defaultProjectName
+        ).trim()
+        let shouldUpdateDefaultProjectName = false
+
+        // If there is no default project name, flag it to be set to the default
+        if (!name) {
+          name = DEFAULT_PROJECT_NAME
+          shouldUpdateDefaultProjectName = true
+        }
+
        if (doesProjectNameNeedInterpolated(name)) {
          const nextIndex = await getNextProjectIndex(name, projects)
          name = interpolateProjectNameWithIndex(name, nextIndex)
        }

        await createNewProject(context.defaultDirectory + '/' + name)
+
+        if (shouldUpdateDefaultProjectName) {
+          sendToSettings({
+            type: 'Set Default Project Name',
+            data: { defaultProjectName: DEFAULT_PROJECT_NAME },
+          })
+        }
+
        return `Successfully created "${name}"`
      },
      renameProject: async (
--- a/src/routes/Onboarding/Camera.tsx
+++ b/src/routes/Onboarding/Camera.tsx
@ -4,8 +4,8 @@ import { onboardingPaths, useDismiss, useNextClick } from '.'
 import { useStore } from '../../useStore'

 export default function Units() {
-  const { isMouseDownInStream } = useStore((s) => ({
-    isMouseDownInStream: s.isMouseDownInStream,
+  const { buttonDownInStream } = useStore((s) => ({
+    buttonDownInStream: s.buttonDownInStream,
  }))
  const dismiss = useDismiss()
  const next = useNextClick(onboardingPaths.SKETCHING)
@ -15,14 +15,30 @@ export default function Units() {
      <div
        className={
          'max-w-2xl flex flex-col justify-center bg-chalkboard-10 dark:bg-chalkboard-90 p-8 rounded' +
-          (isMouseDownInStream ? '' : ' pointer-events-auto')
+          (buttonDownInStream ? '' : ' pointer-events-auto')
        }
      >
        <h1 className="text-2xl font-bold">Camera</h1>
        <p className="mt-6">
-          Moving the camera is easy. Just click and drag anywhere in the scene
-          to rotate the camera, or hold down the <kbd>Ctrl</kbd> key and drag to
-          pan the camera.
+          Moving the camera is easy! The controls are as you might expect:
+        </p>
+        <ul className="list-disc list-outside ms-8 mb-4">
+          <li>Click and drag anywhere in the scene to rotate the camera</li>
+          <li>
+            Hold down the <kbd>Shift</kbd> key while clicking and dragging to
+            pan the camera
+          </li>
+          <li>
+            Hold down the <kbd>Ctrl</kbd> key while dragging to zoom. You can
+            also use the scroll wheel to zoom in and out.
+          </li>
+        </ul>
+        <p>
+          What you're seeing here is just a video, and your interactions are
+          being sent to our Geometry Engine API, which sends back video frames
+          in real time. How cool is that? It means that you can use KittyCAD
+          Modeling App (or whatever you want to build) on any device, even a
+          cheap laptop with no graphics card!
        </p>
        <div className="flex justify-between mt-6">
          <ActionButton
--- a/src/routes/Onboarding/Units.tsx
+++ b/src/routes/Onboarding/Units.tsx
@ -1,11 +1,11 @@
 import { faArrowRight, faXmark } from '@fortawesome/free-solid-svg-icons'
-import { BaseUnit, baseUnits } from '../../useStore'
+import { BaseUnit, baseUnits } from '../../machines/settingsMachine'
 import { ActionButton } from '../../components/ActionButton'
 import { SettingsSection } from '../Settings'
 import { Toggle } from '../../components/Toggle/Toggle'
-import { useState } from 'react'
 import { onboardingPaths, useDismiss, useNextClick } from '.'
 import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
+import { UnitSystem } from 'machines/settingsMachine'

 export default function Units() {
  const dismiss = useDismiss()
@ -16,15 +16,6 @@ export default function Units() {
      context: { unitSystem, baseUnit },
    },
  } = useGlobalStateContext()
-  const [tempUnitSystem, setTempUnitSystem] = useState(unitSystem)
-  const [tempBaseUnit, setTempBaseUnit] = useState(baseUnit)
-
-  function handleNextClick() {
-    send({ type: 'Set Unit System', data: { unitSystem: tempUnitSystem } })
-    send({ type: 'Set Base Unit', data: { baseUnit: tempBaseUnit } })
-
-    next()
-  }

  return (
    <div className="fixed grid place-content-center inset-0 bg-chalkboard-110/50 z-50">
@ -38,10 +29,16 @@ export default function Units() {
            offLabel="Imperial"
            onLabel="Metric"
            name="settings-units"
-            checked={tempUnitSystem === 'metric'}
-            onChange={(e) =>
-              setTempUnitSystem(e.target.checked ? 'metric' : 'imperial')
-            }
+            checked={unitSystem === UnitSystem.Metric}
+            onChange={(e) => {
+              const newUnitSystem = e.target.checked
+                ? UnitSystem.Metric
+                : UnitSystem.Imperial
+              send({
+                type: 'Set Unit System',
+                data: { unitSystem: newUnitSystem },
+              })
+            }}
          />
        </SettingsSection>
        <SettingsSection
@ -51,8 +48,13 @@ export default function Units() {
          <select
            id="base-unit"
            className="block w-full px-3 py-1 border border-chalkboard-30 bg-transparent"
-            value={tempBaseUnit}
-            onChange={(e) => setTempBaseUnit(e.target.value as BaseUnit)}
+            value={baseUnit}
+            onChange={(e) => {
+              send({
+                type: 'Set Base Unit',
+                data: { baseUnit: e.target.value as BaseUnit },
+              })
+            }}
          >
            {baseUnits[unitSystem].map((unit) => (
              <option key={unit} value={unit}>
@ -77,7 +79,7 @@ export default function Units() {
          </ActionButton>
          <ActionButton
            Element="button"
-            onClick={handleNextClick}
+            onClick={next}
            icon={{ icon: faArrowRight }}
          >
            Next: Camera
--- a/src/routes/Settings.tsx
+++ b/src/routes/Settings.tsx
@ -6,29 +6,41 @@ import {
 import { ActionButton } from '../components/ActionButton'
 import { AppHeader } from '../components/AppHeader'
 import { open } from '@tauri-apps/api/dialog'
-import { BaseUnit, baseUnits } from '../useStore'
+import {
+  BaseUnit,
+  DEFAULT_PROJECT_NAME,
+  baseUnits,
+} from '../machines/settingsMachine'
 import { Toggle } from '../components/Toggle/Toggle'
-import { useNavigate, useRouteLoaderData } from 'react-router-dom'
+import { useLocation, useNavigate, useRouteLoaderData } from 'react-router-dom'
 import { useHotkeys } from 'react-hotkeys-hook'
 import { IndexLoaderData, paths } from '../Router'
 import { Themes } from '../lib/theme'
 import { useGlobalStateContext } from 'hooks/useGlobalStateContext'
+import {
+  CADProgram,
+  cadPrograms,
+  cameraMouseDragGuards,
+} from 'lib/cameraControls'
+import { UnitSystem } from 'machines/settingsMachine'

 export const Settings = () => {
  const loaderData = useRouteLoaderData(paths.FILE) as IndexLoaderData
  const navigate = useNavigate()
+  const location = useLocation()
  useHotkeys('esc', () => navigate('../'))
  const {
    settings: {
      send,
      state: {
        context: {
+          baseUnit,
+          cameraControls,
+          defaultDirectory,
          defaultProjectName,
          showDebugPanel,
-          defaultDirectory,
-          unitSystem,
-          baseUnit,
          theme,
+          unitSystem,
        },
      },
    },
@ -80,6 +92,42 @@ export const Settings = () => {
          , and start a discussion if you don't see it! Your feedback will help
          us prioritize what to build next.
        </p>
+        <SettingsSection
+          title="Camera Controls"
+          description="How you want to control the camera in the 3D view"
+        >
+          <select
+            id="camera-controls"
+            className="block w-full px-3 py-1 border border-chalkboard-30 bg-transparent"
+            value={cameraControls}
+            onChange={(e) => {
+              send({
+                type: 'Set Camera Controls',
+                data: { cameraControls: e.target.value as CADProgram },
+              })
+            }}
+          >
+            {cadPrograms.map((program) => (
+              <option key={program} value={program}>
+                {program}
+              </option>
+            ))}
+          </select>
+          <ul className="text-sm my-2 mx-4 leading-relaxed">
+            <li>
+              <strong>Pan:</strong>{' '}
+              {cameraMouseDragGuards[cameraControls].pan.description}
+            </li>
+            <li>
+              <strong>Zoom:</strong>{' '}
+              {cameraMouseDragGuards[cameraControls].zoom.description}
+            </li>
+            <li>
+              <strong>Rotate:</strong>{' '}
+              {cameraMouseDragGuards[cameraControls].rotate.description}
+            </li>
+          </ul>
+        </SettingsSection>
        {(window as any).__TAURI__ && (
          <>
            <SettingsSection
@ -116,10 +164,14 @@ export const Settings = () => {
                className="block w-full px-3 py-1 border border-chalkboard-30 bg-transparent"
                defaultValue={defaultProjectName}
                onBlur={(e) => {
+                  const newValue = e.target.value.trim() || DEFAULT_PROJECT_NAME
                  send({
                    type: 'Set Default Project Name',
-                    data: { defaultProjectName: e.target.value },
+                    data: {
+                      defaultProjectName: newValue,
+                    },
                  })
+                  e.target.value = newValue
                }}
                autoCapitalize="off"
                autoComplete="off"
@ -135,9 +187,11 @@ export const Settings = () => {
            offLabel="Imperial"
            onLabel="Metric"
            name="settings-units"
-            checked={unitSystem === 'metric'}
+            checked={unitSystem === UnitSystem.Metric}
            onChange={(e) => {
-              const newUnitSystem = e.target.checked ? 'metric' : 'imperial'
+              const newUnitSystem = e.target.checked
+                ? UnitSystem.Metric
+                : UnitSystem.Imperial
              send({
                type: 'Set Unit System',
                data: { unitSystem: newUnitSystem },
@ -201,24 +255,26 @@ export const Settings = () => {
            ))}
          </select>
        </SettingsSection>
-        <SettingsSection
-          title="Onboarding"
-          description="Replay the onboarding process"
-        >
-          <ActionButton
-            Element="button"
-            onClick={() => {
-              send({
-                type: 'Set Onboarding Status',
-                data: { onboardingStatus: '' },
-              })
-              navigate('..' + paths.ONBOARDING.INDEX)
-            }}
-            icon={{ icon: faArrowRotateBack }}
+        {location.pathname.includes(paths.FILE) && (
+          <SettingsSection
+            title="Onboarding"
+            description="Replay the onboarding process"
          >
-            Replay Onboarding
-          </ActionButton>
-        </SettingsSection>
+            <ActionButton
+              Element="button"
+              onClick={() => {
+                send({
+                  type: 'Set Onboarding Status',
+                  data: { onboardingStatus: '' },
+                })
+                navigate('..' + paths.ONBOARDING.INDEX)
+              }}
+              icon={{ icon: faArrowRotateBack }}
+            >
+              Replay Onboarding
+            </ActionButton>
+          </SettingsSection>
+        )}
      </div>
    </div>
  )
--- a/src/useStore.ts
+++ b/src/useStore.ts
@ -19,6 +19,7 @@ import {
  EngineCommandManager,
 } from './lang/std/engineConnection'
 import { KCLError } from './lang/errors'
+import { defferExecution } from 'lib/utils'

 export type Selection = {
  type: 'default' | 'line-end' | 'line-mid'
@ -94,16 +95,13 @@ export type GuiModes =
      position: Position
    }

-export const baseUnits = {
-  imperial: ['in', 'ft'],
-  metric: ['mm', 'cm', 'm'],
-} as const
-
-export type BaseUnit = 'in' | 'ft' | 'mm' | 'cm' | 'm'
-
-export const baseUnitsUnion = Object.values(baseUnits).flatMap((v) => v)
-
-export type PaneType = 'code' | 'variables' | 'debug' | 'kclErrors' | 'logs'
+export type PaneType =
+  | 'code'
+  | 'variables'
+  | 'debug'
+  | 'kclErrors'
+  | 'logs'
+  | 'lspMessages'

 export interface StoreState {
  editorView: EditorView | null
@ -135,7 +133,9 @@ export interface StoreState {
  ) => void
  updateAstAsync: (ast: Program, focusPath?: PathToNode) => void
  code: string
+  defferedCode: string
  setCode: (code: string) => void
+  defferedSetCode: (code: string) => void
  formatCode: () => void
  errorState: {
    isError: boolean
@ -158,12 +158,12 @@ export interface StoreState {
  setMediaStream: (mediaStream: MediaStream) => void
  isStreamReady: boolean
  setIsStreamReady: (isStreamReady: boolean) => void
-  isMouseDownInStream: boolean
-  setIsMouseDownInStream: (isMouseDownInStream: boolean) => void
+  isLSPServerReady: boolean
+  setIsLSPServerReady: (isLSPServerReady: boolean) => void
+  buttonDownInStream: number
+  setButtonDownInStream: (buttonDownInStream: number) => void
  didDragInStream: boolean
  setDidDragInStream: (didDragInStream: boolean) => void
-  cmdId?: string
-  setCmdId: (cmdId: string) => void
  fileId: string
  setFileId: (fileId: string) => void
  streamDimensions: { streamWidth: number; streamHeight: number }
@ -171,6 +171,8 @@ export interface StoreState {
    streamWidth: number
    streamHeight: number
  }) => void
+  isExecuting: boolean
+  setIsExecuting: (isExecuting: boolean) => void

  showHomeMenu: boolean
  setHomeShowMenu: (showMenu: boolean) => void
@ -189,193 +191,207 @@ let pendingAstUpdates: number[] = []

 export const useStore = create<StoreState>()(
  persist(
-    (set, get) => ({
-      editorView: null,
-      setEditorView: (editorView) => {
-        set({ editorView })
-      },
-      highlightRange: [0, 0],
-      setHighlightRange: (selection) => {
-        set({ highlightRange: selection })
-        const editorView = get().editorView
-        if (editorView) {
-          editorView.dispatch({ effects: addLineHighlight.of(selection) })
-        }
-      },
-      setCursor: (selections) => {
-        const { editorView } = get()
-        if (!editorView) return
-        const ranges: ReturnType<typeof EditorSelection.cursor>[] = []
-        const selectionRangeTypeMap: { [key: number]: Selection['type'] } = {}
-        set({ selectionRangeTypeMap })
-        selections.codeBasedSelections.forEach(({ range, type }) => {
-          if (range?.[1]) {
-            ranges.push(EditorSelection.cursor(range[1]))
-            selectionRangeTypeMap[range[1]] = type
+    (set, get) => {
+      const setDefferedCode = defferExecution(
+        (code: string) => set({ defferedCode: code }),
+        600
+      )
+      return {
+        editorView: null,
+        setEditorView: (editorView) => {
+          set({ editorView })
+        },
+        highlightRange: [0, 0],
+        setHighlightRange: (selection) => {
+          set({ highlightRange: selection })
+          const editorView = get().editorView
+          if (editorView) {
+            editorView.dispatch({ effects: addLineHighlight.of(selection) })
          }
-        })
-        setTimeout(() => {
-          editorView.dispatch({
-            selection: EditorSelection.create(
-              ranges,
-              selections.codeBasedSelections.length - 1
-            ),
+        },
+        setCursor: (selections) => {
+          const { editorView } = get()
+          if (!editorView) return
+          const ranges: ReturnType<typeof EditorSelection.cursor>[] = []
+          const selectionRangeTypeMap: { [key: number]: Selection['type'] } = {}
+          set({ selectionRangeTypeMap })
+          selections.codeBasedSelections.forEach(({ range, type }) => {
+            if (range?.[1]) {
+              ranges.push(EditorSelection.cursor(range[1]))
+              selectionRangeTypeMap[range[1]] = type
+            }
          })
-        })
-      },
-      setCursor2: (codeSelections) => {
-        const currestSelections = get().selectionRanges
-        const code = get().code
-        if (!codeSelections) {
-          get().setCursor({
-            otherSelections: currestSelections.otherSelections,
-            codeBasedSelections: [
-              { range: [0, code.length - 1], type: 'default' },
-            ],
-          })
-          return
-        }
-        const selections: Selections = {
-          ...currestSelections,
-          codeBasedSelections: get().isShiftDown
-            ? [...currestSelections.codeBasedSelections, codeSelections]
-            : [codeSelections],
-        }
-        get().setCursor(selections)
-      },
-      selectionRangeTypeMap: {},
-      selectionRanges: {
-        otherSelections: [],
-        codeBasedSelections: [],
-      },
-      setSelectionRanges: (selectionRanges) =>
-        set({ selectionRanges, selectionRangeTypeMap: {} }),
-      guiMode: { mode: 'default' },
-      lastGuiMode: { mode: 'default' },
-      setGuiMode: (guiMode) => {
-        set({ guiMode })
-      },
-      logs: [],
-      addLog: (log) => {
-        if (Array.isArray(log)) {
-          const cleanLog: any = log.map(({ __geoMeta, ...rest }) => rest)
-          set((state) => ({ logs: [...state.logs, cleanLog] }))
-        } else {
-          set((state) => ({ logs: [...state.logs, log] }))
-        }
-      },
-      resetLogs: () => {
-        set({ logs: [] })
-      },
-      kclErrors: [],
-      addKCLError: (e) => {
-        set((state) => ({ kclErrors: [...state.kclErrors, e] }))
-      },
-      resetKCLErrors: () => {
-        set({ kclErrors: [] })
-      },
-      ast: null,
-      setAst: (ast) => {
-        set({ ast })
-      },
-      updateAst: async (ast, { focusPath, callBack = () => {} } = {}) => {
-        const newCode = recast(ast)
-        const astWithUpdatedSource = parser_wasm(newCode)
-        callBack(astWithUpdatedSource)
-
-        set({ ast: astWithUpdatedSource, code: newCode })
-        if (focusPath) {
-          const { node } = getNodeFromPath<any>(astWithUpdatedSource, focusPath)
-          const { start, end } = node
-          if (!start || !end) return
          setTimeout(() => {
-            get().setCursor({
-              codeBasedSelections: [
-                {
-                  type: 'default',
-                  range: [start, end],
-                },
-              ],
-              otherSelections: [],
+            editorView.dispatch({
+              selection: EditorSelection.create(
+                ranges,
+                selections.codeBasedSelections.length - 1
+              ),
            })
          })
-        }
-      },
-      updateAstAsync: async (ast, focusPath) => {
-        // clear any pending updates
-        pendingAstUpdates.forEach((id) => clearTimeout(id))
-        pendingAstUpdates = []
-        // setup a new update
-        pendingAstUpdates.push(
-          setTimeout(() => {
-            get().updateAst(ast, { focusPath })
-          }, 100) as unknown as number
-        )
-      },
-      code: '',
-      setCode: (code) => {
-        set({ code })
-      },
-      formatCode: async () => {
-        const code = get().code
-        const ast = parser_wasm(code)
-        const newCode = recast(ast)
-        set({ code: newCode, ast })
-      },
-      errorState: {
-        isError: false,
-        error: '',
-      },
-      setError: (error = '') => {
-        set({ errorState: { isError: !!error, error } })
-      },
-      programMemory: { root: {}, pendingMemory: {} },
-      setProgramMemory: (programMemory) => set({ programMemory }),
-      isShiftDown: false,
-      setIsShiftDown: (isShiftDown) => set({ isShiftDown }),
-      artifactMap: {},
-      sourceRangeMap: {},
-      setArtifactNSourceRangeMaps: (maps) => set({ ...maps }),
-      setEngineCommandManager: (engineCommandManager) =>
-        set({ engineCommandManager }),
-      setMediaStream: (mediaStream) => set({ mediaStream }),
-      isStreamReady: false,
-      setIsStreamReady: (isStreamReady) => set({ isStreamReady }),
-      isMouseDownInStream: false,
-      setIsMouseDownInStream: (isMouseDownInStream) => {
-        set({ isMouseDownInStream })
-      },
-      didDragInStream: false,
-      setDidDragInStream: (didDragInStream) => {
-        set({ didDragInStream })
-      },
-      // For stream event handling
-      cmdId: undefined,
-      setCmdId: (cmdId) => set({ cmdId }),
-      fileId: '',
-      setFileId: (fileId) => set({ fileId }),
-      streamDimensions: { streamWidth: 1280, streamHeight: 720 },
-      setStreamDimensions: (streamDimensions) => set({ streamDimensions }),
+        },
+        setCursor2: (codeSelections) => {
+          const currestSelections = get().selectionRanges
+          const code = get().code
+          if (!codeSelections) {
+            get().setCursor({
+              otherSelections: currestSelections.otherSelections,
+              codeBasedSelections: [
+                { range: [0, code.length - 1], type: 'default' },
+              ],
+            })
+            return
+          }
+          const selections: Selections = {
+            ...currestSelections,
+            codeBasedSelections: get().isShiftDown
+              ? [...currestSelections.codeBasedSelections, codeSelections]
+              : [codeSelections],
+          }
+          get().setCursor(selections)
+        },
+        selectionRangeTypeMap: {},
+        selectionRanges: {
+          otherSelections: [],
+          codeBasedSelections: [],
+        },
+        setSelectionRanges: (selectionRanges) =>
+          set({ selectionRanges, selectionRangeTypeMap: {} }),
+        guiMode: { mode: 'default' },
+        lastGuiMode: { mode: 'default' },
+        setGuiMode: (guiMode) => {
+          set({ guiMode })
+        },
+        logs: [],
+        addLog: (log) => {
+          if (Array.isArray(log)) {
+            const cleanLog: any = log.map(({ __geoMeta, ...rest }) => rest)
+            set((state) => ({ logs: [...state.logs, cleanLog] }))
+          } else {
+            set((state) => ({ logs: [...state.logs, log] }))
+          }
+        },
+        resetLogs: () => {
+          set({ logs: [] })
+        },
+        kclErrors: [],
+        addKCLError: (e) => {
+          set((state) => ({ kclErrors: [...state.kclErrors, e] }))
+        },
+        resetKCLErrors: () => {
+          set({ kclErrors: [] })
+        },
+        ast: null,
+        setAst: (ast) => {
+          set({ ast })
+        },
+        updateAst: async (ast, { focusPath, callBack = () => {} } = {}) => {
+          const newCode = recast(ast)
+          const astWithUpdatedSource = parser_wasm(newCode)
+          callBack(astWithUpdatedSource)

-      // tauri specific app settings
-      defaultDir: {
-        dir: '',
-      },
-      isBannerDismissed: false,
-      setBannerDismissed: (isBannerDismissed) => set({ isBannerDismissed }),
-      openPanes: ['code'],
-      setOpenPanes: (openPanes) => set({ openPanes }),
-      showHomeMenu: true,
-      setHomeShowMenu: (showHomeMenu) => set({ showHomeMenu }),
-      homeMenuItems: [],
-      setHomeMenuItems: (homeMenuItems) => set({ homeMenuItems }),
-    }),
+          set({ ast: astWithUpdatedSource, code: newCode })
+          if (focusPath) {
+            const { node } = getNodeFromPath<any>(
+              astWithUpdatedSource,
+              focusPath
+            )
+            const { start, end } = node
+            if (!start || !end) return
+            setTimeout(() => {
+              get().setCursor({
+                codeBasedSelections: [
+                  {
+                    type: 'default',
+                    range: [start, end],
+                  },
+                ],
+                otherSelections: [],
+              })
+            })
+          }
+        },
+        updateAstAsync: async (ast, focusPath) => {
+          // clear any pending updates
+          pendingAstUpdates.forEach((id) => clearTimeout(id))
+          pendingAstUpdates = []
+          // setup a new update
+          pendingAstUpdates.push(
+            setTimeout(() => {
+              get().updateAst(ast, { focusPath })
+            }, 100) as unknown as number
+          )
+        },
+        code: '',
+        defferedCode: '',
+        setCode: (code) => set({ code, defferedCode: code }),
+        defferedSetCode: (code) => {
+          set({ code })
+          setDefferedCode(code)
+        },
+        formatCode: async () => {
+          const code = get().code
+          const ast = parser_wasm(code)
+          const newCode = recast(ast)
+          set({ code: newCode, ast })
+        },
+        errorState: {
+          isError: false,
+          error: '',
+        },
+        setError: (error = '') => {
+          set({ errorState: { isError: !!error, error } })
+        },
+        programMemory: { root: {}, pendingMemory: {} },
+        setProgramMemory: (programMemory) => set({ programMemory }),
+        isShiftDown: false,
+        setIsShiftDown: (isShiftDown) => set({ isShiftDown }),
+        artifactMap: {},
+        sourceRangeMap: {},
+        setArtifactNSourceRangeMaps: (maps) => set({ ...maps }),
+        setEngineCommandManager: (engineCommandManager) =>
+          set({ engineCommandManager }),
+        setMediaStream: (mediaStream) => set({ mediaStream }),
+        isStreamReady: false,
+        setIsStreamReady: (isStreamReady) => set({ isStreamReady }),
+        isLSPServerReady: false,
+        setIsLSPServerReady: (isLSPServerReady) => set({ isLSPServerReady }),
+        buttonDownInStream: 0,
+        setButtonDownInStream: (buttonDownInStream) => {
+          set({ buttonDownInStream })
+        },
+        didDragInStream: false,
+        setDidDragInStream: (didDragInStream) => {
+          set({ didDragInStream })
+        },
+        // For stream event handling
+        fileId: '',
+        setFileId: (fileId) => set({ fileId }),
+        streamDimensions: { streamWidth: 1280, streamHeight: 720 },
+        setStreamDimensions: (streamDimensions) => set({ streamDimensions }),
+        isExecuting: false,
+        setIsExecuting: (isExecuting) => set({ isExecuting }),
+
+        // tauri specific app settings
+        defaultDir: {
+          dir: '',
+        },
+        isBannerDismissed: false,
+        setBannerDismissed: (isBannerDismissed) => set({ isBannerDismissed }),
+        openPanes: ['code'],
+        setOpenPanes: (openPanes) => set({ openPanes }),
+        showHomeMenu: true,
+        setHomeShowMenu: (showHomeMenu) => set({ showHomeMenu }),
+        homeMenuItems: [],
+        setHomeMenuItems: (homeMenuItems) => set({ homeMenuItems }),
+      }
+    },
    {
      name: 'store',
      partialize: (state) =>
        Object.fromEntries(
          Object.entries(state).filter(([key]) =>
-            ['code', 'openPanes'].includes(key)
+            ['code', 'defferedCode', 'openPanes'].includes(key)
          )
        ),
    }
--- a/src/wasm-lib/Cargo.lock
+++ b/src/wasm-lib/Cargo.lock
@ -29,10 +29,11 @@ checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"

 [[package]]
 name = "ahash"
-version = "0.7.6"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
 dependencies = [
+ "cfg-if",
 "getrandom",
 "once_cell",
 "version_check",
@ -62,6 +63,54 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "anstream"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1f58811cfac344940f1a400b6e6231ce35171f614f26439e80f8c1465c5cc0c"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15c4c2c83f81532e5845a733998b6971faca23490340a418e9b72a3ec9de12ea"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "938874ff5980b03a87c5524b3ae5b59cf99b1d6bc836848df7bc5ada9643c333"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ca11d4be1bab0c8bc8734a9aa7bf4ee8316d462a08c6ac5052f888fef5b494b"
+dependencies = [
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58f54d10c6dfa51283a066ceab3ec1ab78d13fae00aa49243a45e4571fb79dfd"
+dependencies = [
+ "anstyle",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.75"
@ -77,6 +126,22 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bddcadddf5e9015d310179a59bb28c4d4b9920ad0f11e8e14dbadf654890c9a6"

+[[package]]
+name = "async-codec-lite"
+version = "0.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2527c30e3972d8ff366b353125dae828c4252a154dbe6063684f6c5e014760a3"
+dependencies = [
+ "anyhow",
+ "bytes",
+ "futures-core",
+ "futures-io",
+ "futures-sink",
+ "log",
+ "pin-project-lite",
+ "thiserror",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.73"
@ -99,6 +164,18 @@ dependencies = [
 "winapi",
 ]

+[[package]]
+name = "auto_impl"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fee3da8ef1276b0bee5dd1c7258010d8fffd31801447323115a25560e1327b89"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@ -187,9 +264,9 @@ dependencies = [

 [[package]]
 name = "bson"
-version = "2.6.1"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9aeb8bae494e49dbc330dd23cf78f6f7accee22f640ce3ab17841badaa4ce232"
+checksum = "58da0ae1e701ea752cc46c1bb9f39d5ecefc7395c3ecd526261a566d4f16e0c2"
 dependencies = [
 "ahash",
 "base64 0.13.1",
@ -198,7 +275,7 @@ dependencies = [
 "hex",
 "indexmap 1.9.3",
 "js-sys",
- "lazy_static",
+ "once_cell",
 "rand",
 "serde",
 "serde_bytes",
@ -267,8 +344,8 @@ checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
 dependencies = [
 "atty",
 "bitflags 1.3.2",
- "clap_derive",
- "clap_lex",
+ "clap_derive 3.2.25",
+ "clap_lex 0.2.4",
 "indexmap 1.9.3",
 "once_cell",
 "strsim",
@ -277,6 +354,30 @@ dependencies = [
 "unicase",
 ]

+[[package]]
+name = "clap"
+version = "4.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a13b88d2c62ff462f88e4a121f17a82c1af05693a2f192b5c38d14de73c19f6"
+dependencies = [
+ "clap_builder",
+ "clap_derive 4.4.2",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bb9faaa7c2ef94b2743a21f5a29e6f0010dff4caa69ac8e9d6cf8b6fa74da08"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex 0.5.1",
+ "strsim",
+ "unicase",
+ "unicode-width",
+]
+
 [[package]]
 name = "clap_derive"
 version = "3.2.25"
@ -290,6 +391,18 @@ dependencies = [
 "syn 1.0.109",
 ]

+[[package]]
+name = "clap_derive"
+version = "4.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0862016ff20d69b84ef8247369fabf5c008a7417002411897d40ee1f4532b873"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "clap_lex"
 version = "0.2.4"
@ -299,6 +412,18 @@ dependencies = [
 "os_str_bytes",
 ]

+[[package]]
+name = "clap_lex"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd7cc57abe963c6d3b9d8be5b06ba7c8957a930305ca90304f24ef040aa6f961"
+
+[[package]]
+name = "colorchoice"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
+
 [[package]]
 name = "colored"
 version = "2.0.4"
@ -386,6 +511,19 @@ dependencies = [
 "typenum",
 ]

+[[package]]
+name = "dashmap"
+version = "5.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "978747c1d849a7d2ee5e8adc0159961c48fb7e5db2f06af6723b80123bb53856"
+dependencies = [
+ "cfg-if",
+ "hashbrown 0.14.0",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core",
+]
+
 [[package]]
 name = "data-encoding"
 version = "2.4.0"
@ -400,7 +538,7 @@ checksum = "f2696e8a945f658fd14dc3b87242e6b80cd0f36ff04ea560fa39082368847946"

 [[package]]
 name = "derive-docs"
-version = "0.1.0"
+version = "0.1.3"
 dependencies = [
 "convert_case",
 "expectorate",
@ -415,9 +553,9 @@ dependencies = [

 [[package]]
 name = "derive-docs"
-version = "0.1.0"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "075291fd1d6d70a886078f7b1c132a160559ceb9a0fe143177872d40ea587906"
+checksum = "5fe5c5ea065cfabc5a7c5e8ed616e369fbf108c4be01e0e5609bc9846a732664"
 dependencies = [
 "convert_case",
 "proc-macro2",
@ -919,6 +1057,15 @@ dependencies = [
 "either",
 ]

+[[package]]
+name = "itertools"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.9"
@ -947,13 +1094,16 @@ dependencies = [

 [[package]]
 name = "kcl-lib"
-version = "0.1.3"
+version = "0.1.26"
 dependencies = [
 "anyhow",
 "bson",
- "derive-docs 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 4.4.2",
+ "dashmap",
+ "derive-docs 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 "expectorate",
 "futures",
+ "itertools 0.11.0",
 "js-sys",
 "kittycad",
 "lazy_static",
@ -967,6 +1117,7 @@ dependencies = [
 "thiserror",
 "tokio",
 "tokio-tungstenite",
+ "tower-lsp",
 "ts-rs-json-value",
 "uuid",
 "wasm-bindgen",
@ -975,16 +1126,16 @@ dependencies = [

 [[package]]
 name = "kittycad"
-version = "0.2.22"
+version = "0.2.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0247f7acbe36141604ad02b796b596fe0392fb86dd82550eb2f4855b2a493344"
+checksum = "d9cf962b1e81a0b4eb923a727e761b40672cbacc7f5f0b75e13579d346352bc7"
 dependencies = [
 "anyhow",
 "base64 0.21.2",
 "bytes",
 "chrono",
 "data-encoding",
- "itertools",
+ "itertools 0.10.5",
 "parse-display",
 "phonenumber",
 "schemars",
@ -1048,6 +1199,19 @@ dependencies = [
 "linked-hash-map",
 ]

+[[package]]
+name = "lsp-types"
+version = "0.94.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c66bfd44a06ae10647fe3f8214762e9369fd4248df1350924b4ef9e770a85ea1"
+dependencies = [
+ "bitflags 1.3.2",
+ "serde",
+ "serde_json",
+ "serde_repr",
+ "url",
+]
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@ -1200,7 +1364,7 @@ dependencies = [
 "Inflector",
 "anyhow",
 "chrono",
- "clap",
+ "clap 3.2.25",
 "data-encoding",
 "format_serde_error",
 "futures-util",
@ -1331,7 +1495,7 @@ dependencies = [
 "bincode",
 "either",
 "fnv",
- "itertools",
+ "itertools 0.10.5",
 "lazy_static",
 "nom",
 "quick-xml",
@ -1342,6 +1506,26 @@ dependencies = [
 "thiserror",
 ]

+[[package]]
+name = "pin-project"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fda4ed1c6c173e3fc7a83629421152e01d7b1f9b7f65fb301e490e8cfc656422"
+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4359fd9c9171ec6e8c62926d6faaf553a8dc3f64e1507e76da7911b4f6a04405"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.13"
@ -1711,9 +1895,9 @@ dependencies = [

 [[package]]
 name = "schemars"
-version = "0.8.12"
+version = "0.8.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "02c613288622e5f0c3fdc5dbd4db1c5fbe752746b1d1a56a0630b78fd00de44f"
+checksum = "763f8cd0d4c71ed8389c90cb8100cba87e763bd01a8e614d4f0af97bcd50a161"
 dependencies = [
 "bigdecimal",
 "bytes",
@ -1728,9 +1912,9 @@ dependencies = [

 [[package]]
 name = "schemars_derive"
-version = "0.8.12"
+version = "0.8.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "109da1e6b197438deb6db99952990c7f959572794b80ff93707d55a232545e7c"
+checksum = "ec0f696e21e10fa546b7ffb1c9672c6de8fbc7a81acf59524386d8639bf12737"
 dependencies = [
 "proc-macro2",
 "quote",
@ -1847,6 +2031,17 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "serde_repr"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8725e1dfadb3a50f7e5ce0b1a540466f6ed3fe7a0fca2ac2b8b831d31316bd00"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "serde_tokenstream"
 version = "0.2.0"
@ -1939,9 +2134,9 @@ checksum = "8347046d4ebd943127157b94d63abb990fcf729dc4e9978927fdf4ac3c998d06"

 [[package]]
 name = "slog-async"
-version = "2.7.0"
+version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "766c59b252e62a34651412870ff55d8c4e6d04df19b43eecb2703e417b097ffe"
+checksum = "72c8038f898a2c79507940990f05386455b3a317d8f18d4caea7cbc3d5096b84"
 dependencies = [
 "crossbeam-channel",
 "slog",
@ -2319,6 +2514,61 @@ dependencies = [
 "walkdir",
 ]

+[[package]]
+name = "tower"
+version = "0.4.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8fa9be0de6cf49e536ce1851f987bd21a43b771b09473c3549a6c853db37c1c"
+dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project",
+ "pin-project-lite",
+ "tower-layer",
+ "tower-service",
+]
+
+[[package]]
+name = "tower-layer"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c20c8dbed6283a09604c3e69b4b7eeb54e298b8a600d4d5ecb5ad39de609f1d0"
+
+[[package]]
+name = "tower-lsp"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4ba052b54a6627628d9b3c34c176e7eda8359b7da9acd497b9f20998d118508"
+dependencies = [
+ "async-codec-lite",
+ "async-trait",
+ "auto_impl",
+ "bytes",
+ "dashmap",
+ "futures",
+ "httparse",
+ "lsp-types",
+ "memchr",
+ "serde",
+ "serde_json",
+ "tokio",
+ "tokio-util",
+ "tower",
+ "tower-lsp-macros",
+ "tracing",
+]
+
+[[package]]
+name = "tower-lsp-macros"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84fd902d4e0b9a4b27f2f440108dc034e1758628a9b702f8ec61ad66355422fa"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "tower-service"
 version = "0.3.2"
@ -2333,9 +2583,21 @@ checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
 dependencies = [
 "cfg-if",
 "pin-project-lite",
+ "tracing-attributes",
 "tracing-core",
 ]

+[[package]]
+name = "tracing-attributes"
+version = "0.1.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f4f31f56159e98206da9efd823404b79b6ef3143b4a7ab76e67b1751b25a4ab"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "tracing-core"
 version = "0.1.31"
@ -2362,10 +2624,11 @@ checksum = "3528ecfd12c466c6f163363caf2d02a71161dd5e1cc6ae7b34207ea2d42d81ed"

 [[package]]
 name = "ts-rs-json-value"
-version = "7.0.0"
+version = "7.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b66d07e64e1e39d693819307757ad16878ff2be1f26d6fc2137c4e23bc0c0545"
+checksum = "f7a6c8eccea9e885ef26336d58ef9ae48b22d7ae3e503422af1902240616d1f6"
 dependencies = [
+ "schemars",
 "serde_json",
 "thiserror",
 "ts-rs-macros",
@ -2489,6 +2752,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"

+[[package]]
+name = "utf8parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
+
 [[package]]
 name = "uuid"
 version = "1.4.1"
@ -2569,6 +2838,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c02dbc21516f9f1f04f187958890d7e6026df8d16540b7ad9492bc34a67cea03"
 dependencies = [
 "cfg-if",
+ "futures-core",
 "js-sys",
 "wasm-bindgen",
 "web-sys",
@ -2608,12 +2878,30 @@ name = "wasm-lib"
 version = "0.1.0"
 dependencies = [
 "bson",
+ "futures",
 "gloo-utils",
+ "js-sys",
 "kcl-lib",
 "kittycad",
 "serde_json",
+ "tower-lsp",
 "wasm-bindgen",
 "wasm-bindgen-futures",
+ "wasm-streams",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-streams"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4609d447824375f43e1ffbc051b50ad8f4b3ae8219680c94452ea05eb240ac7"
+dependencies = [
+ "futures-util",
+ "js-sys",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
 ]

 [[package]]
--- a/src/wasm-lib/Cargo.toml
+++ b/src/wasm-lib/Cargo.toml
@ -8,14 +8,30 @@ edition = "2021"
 crate-type = ["cdylib"]

 [dependencies]
-bson = { version = "2.6.1", features = ["uuid-1", "chrono"] }
+bson = { version = "2.7.0", features = ["uuid-1", "chrono"] }
 gloo-utils = "0.2.0"
 kcl-lib = { path = "kcl" }
-kittycad = { version = "0.2.15", default-features = false, features = ["js"] }
+kittycad = { version = "0.2.25", default-features = false, features = ["js"] }
 serde_json = "1.0.93"
 wasm-bindgen = "0.2.87"
 wasm-bindgen-futures = "0.4.37"

+[target.'cfg(target_arch = "wasm32")'.dependencies]
+futures = "0.3.28"
+js-sys = "0.3.64"
+tower-lsp = { version = "0.20.0", default-features = false, features = ["runtime-agnostic"] }
+wasm-bindgen-futures = { version = "0.4.37", features = ["futures-core-03-stream"] }
+wasm-streams = "0.3.0"
+
+[target.'cfg(target_arch = "wasm32")'.dependencies.web-sys]
+version = "0.3.57"
+features = [
+  "console",
+  "HtmlTextAreaElement",
+  "ReadableStream",
+  "WritableStream",
+]
+
 [profile.release]
 panic = "abort"
 debug = true
@ -23,5 +39,5 @@ debug = true
 [workspace]
 members = [
 	"derive-docs",
-	"kcl"
+	"kcl",
 ]
--- a/src/wasm-lib/derive-docs/Cargo.toml
+++ b/src/wasm-lib/derive-docs/Cargo.toml
@ -1,7 +1,7 @@
 [package]
 name = "derive-docs"
 description = "A tool for generating documentation from Rust derive macros"
-version = "0.1.0"
+version = "0.1.3"
 edition = "2021"
 license = "MIT"

--- a/src/wasm-lib/derive-docs/src/lib.rs
+++ b/src/wasm-lib/derive-docs/src/lib.rs
@ -195,7 +195,9 @@ fn do_stdlib_inner(
                    continue;
                }
            },
-        };
+        }
+        .trim_start_matches('_')
+        .to_string();

        let ty = match arg {
            syn::FnArg::Receiver(pat) => pat.ty.as_ref().into_token_stream(),
@ -247,15 +249,21 @@ fn do_stdlib_inner(
        .replace("-> ", "")
        .replace("Result < ", "")
        .replace(", KclError >", "");
-    let ret_ty_string = ret_ty_string.trim().to_string();
-    let ret_ty_ident = format_ident!("{}", ret_ty_string);
-    let ret_ty_string = clean_type(&ret_ty_string);
-    let return_type = quote! {
-        #docs_crate::StdLibFnArg {
-            name: "".to_string(),
-            type_: #ret_ty_string.to_string(),
-            schema: #ret_ty_ident::json_schema(&mut generator),
-            required: true,
+    let return_type = if !ret_ty_string.is_empty() {
+        let ret_ty_string = ret_ty_string.trim().to_string();
+        let ret_ty_ident = format_ident!("{}", ret_ty_string);
+        let ret_ty_string = clean_type(&ret_ty_string);
+        quote! {
+            Some(#docs_crate::StdLibFnArg {
+                name: "".to_string(),
+                type_: #ret_ty_string.to_string(),
+                schema: #ret_ty_ident::json_schema(&mut generator),
+                required: true,
+            })
+        }
+    } else {
+        quote! {
+            None
        }
    };

@ -275,6 +283,8 @@ fn do_stdlib_inner(
        // ... a struct type called `#name_ident` that has no members
        #[allow(non_camel_case_types, missing_docs)]
        #description_doc_comment
+        #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, schemars::JsonSchema, ts_rs::TS)]
+        #[ts(export)]
        pub(crate) struct #name_ident {}
        // ... a constant of type `#name` whose identifier is also #name_ident
        #[allow(non_upper_case_globals, missing_docs)]
@ -307,7 +317,7 @@ fn do_stdlib_inner(
                vec![#(#arg_types),*]
            }

-            fn return_value(&self) -> #docs_crate::StdLibFnArg {
+            fn return_value(&self) -> Option<#docs_crate::StdLibFnArg> {
                let mut settings = schemars::gen::SchemaSettings::openapi3();
                settings.inline_subschemas = true;
                let mut generator = schemars::gen::SchemaGenerator::new(settings);
@ -326,6 +336,10 @@ fn do_stdlib_inner(
            fn std_lib_fn(&self) -> crate::std::StdFn {
                #fn_name_ident
            }
+
+            fn clone_box(&self) -> Box<dyn #docs_crate::StdLibFn> {
+                Box::new(self.clone())
+            }
        }

        #item
@ -529,4 +543,25 @@ mod tests {
        assert!(errors.is_empty());
        expectorate::assert_contents("tests/min.gen", &openapitor::types::get_text_fmt(&item).unwrap());
    }
+
+    #[test]
+    fn test_stdlib_show() {
+        let (item, errors) = do_stdlib(
+            quote! {
+                name = "show",
+            },
+            quote! {
+                fn inner_show(
+                    /// The args to do shit to.
+                    _args: Vec<f64>
+                ) {
+                }
+            },
+        )
+        .unwrap();
+        let _expected = quote! {};
+
+        assert!(errors.is_empty());
+        expectorate::assert_contents("tests/show.gen", &openapitor::types::get_text_fmt(&item).unwrap());
+    }
 }
--- a/src/wasm-lib/derive-docs/tests/lineTo.gen
+++ b/src/wasm-lib/derive-docs/tests/lineTo.gen
@ -1,5 +1,7 @@
 #[allow(non_camel_case_types, missing_docs)]
 #[doc = "Std lib function: lineTo"]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, schemars :: JsonSchema, ts_rs :: TS)]
+#[ts(export)]
 pub(crate) struct LineTo {}

 #[allow(non_upper_case_globals, missing_docs)]
@ -42,16 +44,16 @@ impl crate::docs::StdLibFn for LineTo {
        ]
    }

-    fn return_value(&self) -> crate::docs::StdLibFnArg {
+    fn return_value(&self) -> Option<crate::docs::StdLibFnArg> {
        let mut settings = schemars::gen::SchemaSettings::openapi3();
        settings.inline_subschemas = true;
        let mut generator = schemars::gen::SchemaGenerator::new(settings);
-        crate::docs::StdLibFnArg {
+        Some(crate::docs::StdLibFnArg {
            name: "".to_string(),
            type_: "SketchGroup".to_string(),
            schema: SketchGroup::json_schema(&mut generator),
            required: true,
-        }
+        })
    }

    fn unpublished(&self) -> bool {
@ -65,6 +67,10 @@ impl crate::docs::StdLibFn for LineTo {
    fn std_lib_fn(&self) -> crate::std::StdFn {
        line_to
    }
+
+    fn clone_box(&self) -> Box<dyn crate::docs::StdLibFn> {
+        Box::new(self.clone())
+    }
 }

 fn inner_line_to(
--- a/src/wasm-lib/derive-docs/tests/min.gen
+++ b/src/wasm-lib/derive-docs/tests/min.gen
@ -1,5 +1,7 @@
 #[allow(non_camel_case_types, missing_docs)]
 #[doc = "Std lib function: min"]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, schemars :: JsonSchema, ts_rs :: TS)]
+#[ts(export)]
 pub(crate) struct Min {}

 #[allow(non_upper_case_globals, missing_docs)]
@ -34,16 +36,16 @@ impl crate::docs::StdLibFn for Min {
        }]
    }

-    fn return_value(&self) -> crate::docs::StdLibFnArg {
+    fn return_value(&self) -> Option<crate::docs::StdLibFnArg> {
        let mut settings = schemars::gen::SchemaSettings::openapi3();
        settings.inline_subschemas = true;
        let mut generator = schemars::gen::SchemaGenerator::new(settings);
-        crate::docs::StdLibFnArg {
+        Some(crate::docs::StdLibFnArg {
            name: "".to_string(),
            type_: "number".to_string(),
            schema: f64::json_schema(&mut generator),
            required: true,
-        }
+        })
    }

    fn unpublished(&self) -> bool {
@ -57,6 +59,10 @@ impl crate::docs::StdLibFn for Min {
    fn std_lib_fn(&self) -> crate::std::StdFn {
        min
    }
+
+    fn clone_box(&self) -> Box<dyn crate::docs::StdLibFn> {
+        Box::new(self.clone())
+    }
 }

 fn inner_min(#[doc = r" The args to do shit to."] args: Vec<f64>) -> f64 {
--- a/src/wasm-lib/derive-docs/tests/show.gen
+++ b/src/wasm-lib/derive-docs/tests/show.gen
@ -0,0 +1,63 @@
+#[allow(non_camel_case_types, missing_docs)]
+#[doc = "Std lib function: show"]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, schemars :: JsonSchema, ts_rs :: TS)]
+#[ts(export)]
+pub(crate) struct Show {}
+
+#[allow(non_upper_case_globals, missing_docs)]
+#[doc = "Std lib function: show"]
+pub(crate) const Show: Show = Show {};
+impl crate::docs::StdLibFn for Show {
+    fn name(&self) -> String {
+        "show".to_string()
+    }
+
+    fn summary(&self) -> String {
+        "".to_string()
+    }
+
+    fn description(&self) -> String {
+        "".to_string()
+    }
+
+    fn tags(&self) -> Vec<String> {
+        vec![]
+    }
+
+    fn args(&self) -> Vec<crate::docs::StdLibFnArg> {
+        let mut settings = schemars::gen::SchemaSettings::openapi3();
+        settings.inline_subschemas = true;
+        let mut generator = schemars::gen::SchemaGenerator::new(settings);
+        vec![crate::docs::StdLibFnArg {
+            name: "args".to_string(),
+            type_: "[number]".to_string(),
+            schema: <Vec<f64>>::json_schema(&mut generator),
+            required: true,
+        }]
+    }
+
+    fn return_value(&self) -> Option<crate::docs::StdLibFnArg> {
+        let mut settings = schemars::gen::SchemaSettings::openapi3();
+        settings.inline_subschemas = true;
+        let mut generator = schemars::gen::SchemaGenerator::new(settings);
+        None
+    }
+
+    fn unpublished(&self) -> bool {
+        false
+    }
+
+    fn deprecated(&self) -> bool {
+        false
+    }
+
+    fn std_lib_fn(&self) -> crate::std::StdFn {
+        show
+    }
+
+    fn clone_box(&self) -> Box<dyn crate::docs::StdLibFn> {
+        Box::new(self.clone())
+    }
+}
+
+fn inner_show(#[doc = r" The args to do shit to."] _args: Vec<f64>) {}
--- a/src/wasm-lib/kcl/Cargo.toml
+++ b/src/wasm-lib/kcl/Cargo.toml
@ -1,37 +1,46 @@
 [package]
 name = "kcl-lib"
 description = "KittyCAD Language"
-version = "0.1.3"
+version = "0.1.26"
 edition = "2021"
 license = "MIT"

 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
-anyhow = "1.0.75"
-derive-docs = { version = "0.1.0" }
-kittycad = { version = "0.2.15", default-features = false, features = ["js"] }
+anyhow = { version = "1.0.75", features = ["backtrace"] }
+clap = { version = "4.4.2", features = ["cargo", "derive", "env", "unicode"] }
+dashmap = "5.5.3"
+derive-docs = { version = "0.1.3" }
+#derive-docs = { path = "../derive-docs" }
+kittycad = { version = "0.2.25", default-features = false, features = ["js"] }
 lazy_static = "1.4.0"
 parse-display = "0.8.2"
 regex = "1.7.1"
-schemars = { version = "0.8", features = ["url", "uuid1"] }
+schemars = { version = "0.8", features = ["impl_json_schema", "url", "uuid1"] }
 serde = {version = "1.0.152", features = ["derive"] }
 serde_json = "1.0.93"
 thiserror = "1.0.47"
-ts-rs = { version = "7", package = "ts-rs-json-value", features = ["serde-json-impl", "uuid-impl"] }
+ts-rs = { version = "7", package = "ts-rs-json-value", features = ["serde-json-impl", "schemars-impl", "uuid-impl"] }
 uuid = { version = "1.4.1", features = ["v4", "js", "serde"] }
-wasm-bindgen = "0.2.87"
-wasm-bindgen-futures = "0.4.37"

 [target.'cfg(target_arch = "wasm32")'.dependencies]
 js-sys = { version = "0.3.64" }
+tower-lsp = { version = "0.20.0", default-features = false, features = ["runtime-agnostic"] }
+wasm-bindgen = "0.2.87"
+wasm-bindgen-futures = "0.4.37"

 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
-bson = { version = "2.6.1", features = ["uuid-1", "chrono"] }
+bson = { version = "2.7.0", features = ["uuid-1", "chrono"] }
 futures = { version = "0.3.28" }
 reqwest = { version = "0.11.20", default-features = false }
 tokio = { version = "1.32.0", features = ["full"] }
 tokio-tungstenite = { version = "0.20.0", features = ["rustls-tls-native-roots"] }
+tower-lsp = { version = "0.20.0", features = ["proposed"] }
+
+[features]
+default = ["engine"]
+engine = []

 [profile.release]
 panic = "abort"
@ -39,5 +48,6 @@ debug = true

 [dev-dependencies]
 expectorate = "1.0.7"
+itertools = "0.11.0"
 pretty_assertions = "1.4.0"
 tokio = { version = "1.32.0", features = ["rt-multi-thread", "macros", "time"] }
--- a/src/wasm-lib/kcl/fuzz/.gitignore
+++ b/src/wasm-lib/kcl/fuzz/.gitignore
@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage
--- a/src/wasm-lib/kcl/fuzz/Cargo.lock
+++ b/src/wasm-lib/kcl/fuzz/Cargo.lock
--- a/src/wasm-lib/kcl/fuzz/Cargo.toml
+++ b/src/wasm-lib/kcl/fuzz/Cargo.toml
@ -0,0 +1,27 @@
+[package]
+name = "kcl-lib-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.kcl-lib]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[profile.release]
+debug = 1
+
+[[bin]]
+name = "parser"
+path = "fuzz_targets/parser.rs"
+test = false
+doc = false
--- a/src/wasm-lib/kcl/fuzz/fuzz_targets/parser.rs
+++ b/src/wasm-lib/kcl/fuzz/fuzz_targets/parser.rs
@ -0,0 +1,14 @@
+#![no_main]
+#[macro_use]
+extern crate libfuzzer_sys;
+extern crate kcl_lib;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        let tokens = kcl_lib::tokeniser::lexer(s);
+        let parser = kcl_lib::parser::Parser::new(tokens);
+        if let Ok(_) = parser.ast() {
+            println!("OK");
+        }
+    }
+});
--- a/src/wasm-lib/kcl/src/abstract_syntax_tree_types.rs
+++ b/src/wasm-lib/kcl/src/abstract_syntax_tree_types.rs
--- a/src/wasm-lib/kcl/src/docs.rs
+++ b/src/wasm-lib/kcl/src/docs.rs
@ -1,11 +1,18 @@
 //! Functions for generating docs for our stdlib functions.

 use anyhow::Result;
+use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
+use tower_lsp::lsp_types::{
+    CompletionItem, CompletionItemKind, CompletionItemLabelDetails, Documentation, InsertTextFormat, MarkupContent,
+    MarkupKind, ParameterInformation, ParameterLabel, SignatureHelp, SignatureInformation,
+};

 use crate::std::Primitive;

-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, ts_rs::TS)]
+#[ts(export)]
+#[serde(rename_all = "camelCase")]
 pub struct StdLibFnData {
    /// The name of the function.
    pub name: String,
@ -18,7 +25,7 @@ pub struct StdLibFnData {
    /// The args of the function.
    pub args: Vec<StdLibFnArg>,
    /// The return value of the function.
-    pub return_value: StdLibFnArg,
+    pub return_value: Option<StdLibFnArg>,
    /// If the function is unpublished.
    pub unpublished: bool,
    /// If the function is deprecated.
@ -26,7 +33,9 @@ pub struct StdLibFnData {
 }

 /// This struct defines a single argument to a stdlib function.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, ts_rs::TS)]
+#[ts(export)]
+#[serde(rename_all = "camelCase")]
 pub struct StdLibFnArg {
    /// The name of the argument.
    pub name: String,
@ -41,18 +50,36 @@ pub struct StdLibFnArg {
 impl StdLibFnArg {
    #[allow(dead_code)]
    pub fn get_type_string(&self) -> Result<(String, bool)> {
-        get_type_string_from_schema(&self.schema)
+        get_type_string_from_schema(&self.schema.clone())
    }

    #[allow(dead_code)]
+    pub fn get_autocomplete_string(&self) -> Result<String> {
+        get_autocomplete_string_from_schema(&self.schema.clone())
+    }
+
    pub fn description(&self) -> Option<String> {
-        get_description_string_from_schema(&self.schema)
+        get_description_string_from_schema(&self.schema.clone())
+    }
+}
+
+impl From<StdLibFnArg> for ParameterInformation {
+    fn from(arg: StdLibFnArg) -> Self {
+        ParameterInformation {
+            label: ParameterLabel::Simple(arg.name.to_string()),
+            documentation: arg.description().map(|description| {
+                Documentation::MarkupContent(MarkupContent {
+                    kind: MarkupKind::Markdown,
+                    value: description,
+                })
+            }),
+        }
    }
 }

 /// This trait defines functions called upon stdlib functions to generate
 /// documentation for them.
-pub trait StdLibFn {
+pub trait StdLibFn: std::fmt::Debug + Send + Sync {
    /// The name of the function.
    fn name(&self) -> String;

@ -69,7 +96,7 @@ pub trait StdLibFn {
    fn args(&self) -> Vec<StdLibFnArg>;

    /// The return value of the function.
-    fn return_value(&self) -> StdLibFnArg;
+    fn return_value(&self) -> Option<StdLibFnArg>;

    /// If the function is unpublished.
    fn unpublished(&self) -> bool;
@ -80,6 +107,9 @@ pub trait StdLibFn {
    /// The function itself.
    fn std_lib_fn(&self) -> crate::std::StdFn;

+    /// Helper function to clone the boxed trait object.
+    fn clone_box(&self) -> Box<dyn StdLibFn>;
+
    /// Return a JSON struct representing the function.
    fn to_json(&self) -> Result<StdLibFnData> {
        Ok(StdLibFnData {
@ -93,9 +123,152 @@ pub trait StdLibFn {
            deprecated: self.deprecated(),
        })
    }
+
+    fn fn_signature(&self) -> String {
+        let mut signature = String::new();
+        signature.push_str(&format!("{}(", self.name()));
+        for (i, arg) in self.args().iter().enumerate() {
+            if i > 0 {
+                signature.push_str(", ");
+            }
+            signature.push_str(&format!("{}: {}", arg.name, arg.type_));
+        }
+        signature.push(')');
+        if let Some(return_value) = self.return_value() {
+            signature.push_str(&format!(" -> {}", return_value.type_));
+        }
+
+        signature
+    }
+
+    fn to_completion_item(&self) -> CompletionItem {
+        CompletionItem {
+            label: self.name(),
+            label_details: Some(CompletionItemLabelDetails {
+                detail: Some(self.fn_signature().replace(&self.name(), "")),
+                description: None,
+            }),
+            kind: Some(CompletionItemKind::FUNCTION),
+            detail: None,
+            documentation: Some(Documentation::MarkupContent(MarkupContent {
+                kind: MarkupKind::Markdown,
+                value: if !self.description().is_empty() {
+                    format!("{}\n\n{}", self.summary(), self.description())
+                } else {
+                    self.summary()
+                },
+            })),
+            deprecated: Some(self.deprecated()),
+            preselect: None,
+            sort_text: None,
+            filter_text: None,
+            insert_text: Some(format!(
+                "{}({})",
+                self.name(),
+                self.args()
+                    .iter()
+                    .enumerate()
+                    // It is okay to unwrap here since in the `kcl-lib` tests, we would have caught
+                    // any errors in the `self`'s signature.
+                    .map(|(index, item)| {
+                        let format = item.get_autocomplete_string().unwrap();
+                        if item.type_ == "SketchGroup" || item.type_ == "ExtrudeGroup" {
+                            format!("${{{}:{}}}", index + 1, "%")
+                        } else {
+                            format!("${{{}:{}}}", index + 1, format)
+                        }
+                    })
+                    .collect::<Vec<_>>()
+                    .join(",")
+            )),
+            insert_text_format: Some(InsertTextFormat::SNIPPET),
+            insert_text_mode: None,
+            text_edit: None,
+            additional_text_edits: None,
+            command: None,
+            commit_characters: None,
+            data: None,
+            tags: None,
+        }
+    }
+
+    fn to_signature_help(&self) -> SignatureHelp {
+        // Fill this in based on the current positon of the cursor.
+        let active_parameter = None;
+
+        SignatureHelp {
+            signatures: vec![SignatureInformation {
+                label: self.name(),
+                documentation: Some(Documentation::MarkupContent(MarkupContent {
+                    kind: MarkupKind::Markdown,
+                    value: if !self.description().is_empty() {
+                        format!("{}\n\n{}", self.summary(), self.description())
+                    } else {
+                        self.summary()
+                    },
+                })),
+                parameters: Some(self.args().into_iter().map(|arg| arg.into()).collect()),
+                active_parameter,
+            }],
+            active_signature: Some(0),
+            active_parameter,
+        }
+    }
 }

-fn get_description_string_from_schema(schema: &schemars::schema::Schema) -> Option<String> {
+impl JsonSchema for dyn StdLibFn {
+    fn schema_name() -> String {
+        "StdLibFn".to_string()
+    }
+
+    fn json_schema(gen: &mut schemars::gen::SchemaGenerator) -> schemars::schema::Schema {
+        gen.subschema_for::<StdLibFnData>()
+    }
+}
+
+impl Serialize for Box<dyn StdLibFn> {
+    fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        self.to_json().unwrap().serialize(serializer)
+    }
+}
+
+impl<'de> Deserialize<'de> for Box<dyn StdLibFn> {
+    fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
+        let data = StdLibFnData::deserialize(deserializer)?;
+        let stdlib = crate::std::StdLib::new();
+        let stdlib_fn = stdlib
+            .get(&data.name)
+            .ok_or_else(|| serde::de::Error::custom(format!("StdLibFn {} not found", data.name)))?;
+        Ok(stdlib_fn)
+    }
+}
+
+impl ts_rs::TS for dyn StdLibFn {
+    const EXPORT_TO: Option<&'static str> = Some("bindings/StdLibFnData");
+
+    fn name() -> String {
+        "StdLibFnData".to_string()
+    }
+
+    fn dependencies() -> Vec<ts_rs::Dependency>
+    where
+        Self: 'static,
+    {
+        StdLibFnData::dependencies()
+    }
+
+    fn transparent() -> bool {
+        StdLibFnData::transparent()
+    }
+}
+
+impl Clone for Box<dyn StdLibFn> {
+    fn clone(&self) -> Box<dyn StdLibFn> {
+        self.clone_box()
+    }
+}
+
+pub fn get_description_string_from_schema(schema: &schemars::schema::Schema) -> Option<String> {
    if let schemars::schema::Schema::Object(o) = schema {
        if let Some(metadata) = &o.metadata {
            if let Some(description) = &metadata.description {
@ -107,7 +280,7 @@ fn get_description_string_from_schema(schema: &schemars::schema::Schema) -> Opti
    None
 }

-fn get_type_string_from_schema(schema: &schemars::schema::Schema) -> Result<(String, bool)> {
+pub fn get_type_string_from_schema(schema: &schemars::schema::Schema) -> Result<(String, bool)> {
    match schema {
        schemars::schema::Schema::Object(o) => {
            if let Some(format) = &o.format {
@ -132,11 +305,7 @@ fn get_type_string_from_schema(schema: &schemars::schema::Schema) -> Result<(Str
                    if let Some(description) = get_description_string_from_schema(prop) {
                        fn_docs.push_str(&format!("\t// {}\n", description));
                    }
-                    fn_docs.push_str(&format!(
-                        "\t\"{}\": {},\n",
-                        prop_name,
-                        get_type_string_from_schema(prop)?.0,
-                    ));
+                    fn_docs.push_str(&format!("\t{}: {},\n", prop_name, get_type_string_from_schema(prop)?.0,));
                }

                fn_docs.push('}');
@ -187,3 +356,168 @@ fn get_type_string_from_schema(schema: &schemars::schema::Schema) -> Result<(Str
        schemars::schema::Schema::Bool(_) => Ok((Primitive::Bool.to_string(), false)),
    }
 }
+
+pub fn get_autocomplete_string_from_schema(schema: &schemars::schema::Schema) -> Result<String> {
+    match schema {
+        schemars::schema::Schema::Object(o) => {
+            if let Some(format) = &o.format {
+                if format == "uuid" {
+                    return Ok(Primitive::Uuid.to_string());
+                } else if format == "double" || format == "uint" {
+                    return Ok(Primitive::Number.to_string());
+                } else {
+                    anyhow::bail!("unknown format: {}", format);
+                }
+            }
+
+            if let Some(obj_val) = &o.object {
+                let mut fn_docs = String::new();
+                fn_docs.push_str("{\n");
+                // Let's print out the object's properties.
+                for (prop_name, prop) in obj_val.properties.iter() {
+                    if prop_name.starts_with('_') {
+                        continue;
+                    }
+
+                    if let Some(description) = get_description_string_from_schema(prop) {
+                        fn_docs.push_str(&format!("\t// {}\n", description));
+                    }
+                    fn_docs.push_str(&format!(
+                        "\t{}: {},\n",
+                        prop_name,
+                        get_autocomplete_string_from_schema(prop)?,
+                    ));
+                }
+
+                fn_docs.push('}');
+
+                return Ok(fn_docs);
+            }
+
+            if let Some(array_val) = &o.array {
+                if let Some(schemars::schema::SingleOrVec::Single(items)) = &array_val.items {
+                    // Let's print out the object's properties.
+                    return Ok(format!("[{}]", get_autocomplete_string_from_schema(items)?));
+                } else if let Some(items) = &array_val.contains {
+                    return Ok(format!("[{}]", get_autocomplete_string_from_schema(items)?));
+                }
+            }
+
+            if let Some(subschemas) = &o.subschemas {
+                let mut fn_docs = String::new();
+                if let Some(items) = &subschemas.one_of {
+                    if let Some(item) = items.iter().next() {
+                        // Let's print out the object's properties.
+                        fn_docs.push_str(&get_autocomplete_string_from_schema(item)?);
+                    }
+                } else if let Some(items) = &subschemas.any_of {
+                    if let Some(item) = items.iter().next() {
+                        // Let's print out the object's properties.
+                        fn_docs.push_str(&get_autocomplete_string_from_schema(item)?);
+                    }
+                } else {
+                    anyhow::bail!("unknown subschemas: {:#?}", subschemas);
+                }
+
+                return Ok(fn_docs);
+            }
+
+            if let Some(schemars::schema::SingleOrVec::Single(_string)) = &o.instance_type {
+                return Ok(Primitive::String.to_string());
+            }
+
+            anyhow::bail!("unknown type: {:#?}", o)
+        }
+        schemars::schema::Schema::Bool(_) => Ok(Primitive::Bool.to_string()),
+    }
+}
+
+pub fn completion_item_from_enum_schema(
+    schema: &schemars::schema::Schema,
+    kind: CompletionItemKind,
+) -> Result<CompletionItem> {
+    // Get the docs for the schema.
+    let description = get_description_string_from_schema(schema).unwrap_or_default();
+    let schemars::schema::Schema::Object(o) = schema else {
+        anyhow::bail!("expected object schema: {:#?}", schema);
+    };
+    let Some(enum_values) = o.enum_values.as_ref() else {
+        anyhow::bail!("expected enum values: {:#?}", o);
+    };
+
+    if enum_values.len() > 1 {
+        anyhow::bail!("expected only one enum value: {:#?}", o);
+    }
+
+    if enum_values.is_empty() {
+        anyhow::bail!("expected at least one enum value: {:#?}", o);
+    }
+
+    let label = enum_values[0].to_string();
+
+    Ok(CompletionItem {
+        label,
+        label_details: None,
+        kind: Some(kind),
+        detail: Some(description.to_string()),
+        documentation: Some(Documentation::MarkupContent(MarkupContent {
+            kind: MarkupKind::Markdown,
+            value: description.to_string(),
+        })),
+        deprecated: Some(false),
+        preselect: None,
+        sort_text: None,
+        filter_text: None,
+        insert_text: None,
+        insert_text_format: None,
+        insert_text_mode: None,
+        text_edit: None,
+        additional_text_edits: None,
+        command: None,
+        commit_characters: None,
+        data: None,
+        tags: None,
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use pretty_assertions::assert_eq;
+
+    #[test]
+    fn test_serialize_function() {
+        let some_function = crate::abstract_syntax_tree_types::Function::StdLib {
+            func: Box::new(crate::std::sketch::Line),
+        };
+        let serialized = serde_json::to_string(&some_function).unwrap();
+        assert!(serialized.contains(r#"{"type":"StdLib""#));
+    }
+
+    #[test]
+    fn test_deserialize_function() {
+        let some_function_string = r#"{"type":"StdLib","func":{"name":"line","summary":"","description":"","tags":[],"returnValue":{"type":"","required":false,"name":"","schema":{}},"args":[],"unpublished":false,"deprecated":false}}"#;
+        let some_function: crate::abstract_syntax_tree_types::Function =
+            serde_json::from_str(some_function_string).unwrap();
+
+        assert_eq!(
+            some_function,
+            crate::abstract_syntax_tree_types::Function::StdLib {
+                func: Box::new(crate::std::sketch::Line),
+            }
+        );
+    }
+
+    #[test]
+    fn test_deserialize_function_show() {
+        let some_function_string = r#"{"type":"StdLib","func":{"name":"show","summary":"","description":"","tags":[],"returnValue":{"type":"","required":false,"name":"","schema":{}},"args":[],"unpublished":false,"deprecated":false}}"#;
+        let some_function: crate::abstract_syntax_tree_types::Function =
+            serde_json::from_str(some_function_string).unwrap();
+
+        assert_eq!(
+            some_function,
+            crate::abstract_syntax_tree_types::Function::StdLib {
+                func: Box::new(crate::std::Show),
+            }
+        );
+    }
+}
--- a/src/wasm-lib/kcl/src/engine/conn.rs
+++ b/src/wasm-lib/kcl/src/engine/conn.rs
@ -87,6 +87,9 @@ impl EngineConnection {

                        if let Some(msg) = ws_resp.resp {
                            match msg {
+                                OkWebSocketResponseData::MetricsRequest {} => {
+                                    // @paultag todo
+                                }
                                OkWebSocketResponseData::IceServerInfo { ice_servers } => {
                                    println!("got ice server info: {:?}", ice_servers);
                                }
--- a/src/wasm-lib/kcl/src/engine/mod.rs
+++ b/src/wasm-lib/kcl/src/engine/mod.rs
@ -1,19 +1,26 @@
 //! Functions for managing engine communications.

+#[cfg(target_arch = "wasm32")]
+#[cfg(not(test))]
+#[cfg(feature = "engine")]
 use wasm_bindgen::prelude::*;

 #[cfg(not(target_arch = "wasm32"))]
 #[cfg(not(test))]
+#[cfg(feature = "engine")]
 pub mod conn;
 #[cfg(not(target_arch = "wasm32"))]
 #[cfg(not(test))]
+#[cfg(feature = "engine")]
 pub use conn::EngineConnection;

 #[cfg(target_arch = "wasm32")]
 #[cfg(not(test))]
+#[cfg(feature = "engine")]
 pub mod conn_wasm;
 #[cfg(target_arch = "wasm32")]
 #[cfg(not(test))]
+#[cfg(feature = "engine")]
 pub use conn_wasm::EngineConnection;

 #[cfg(test)]
@ -21,18 +28,25 @@ pub mod conn_mock;
 #[cfg(test)]
 pub use conn_mock::EngineConnection;

-use crate::executor::SourceRange;
+#[cfg(not(feature = "engine"))]
+#[cfg(not(test))]
+pub mod conn_mock;
+#[cfg(not(feature = "engine"))]
+#[cfg(not(test))]
+pub use conn_mock::EngineConnection;

+#[cfg(target_arch = "wasm32")]
+#[cfg(not(test))]
 #[derive(Debug)]
 #[wasm_bindgen]
 pub struct EngineManager {
    connection: EngineConnection,
 }
-
+#[cfg(target_arch = "wasm32")]
+#[cfg(not(test))]
+#[cfg(feature = "engine")]
 #[wasm_bindgen]
 impl EngineManager {
-    #[cfg(target_arch = "wasm32")]
-    #[cfg(not(test))]
    #[wasm_bindgen(constructor)]
    pub async fn new(manager: conn_wasm::EngineCommandManager) -> EngineManager {
        EngineManager {
@ -45,7 +59,7 @@ impl EngineManager {
        let id = uuid::Uuid::parse_str(id_str).map_err(|e| e.to_string())?;
        let cmd = serde_json::from_str(cmd_str).map_err(|e| e.to_string())?;
        self.connection
-            .send_modeling_cmd(id, SourceRange::default(), cmd)
+            .send_modeling_cmd(id, crate::executor::SourceRange::default(), cmd)
            .map_err(String::from)?;

        Ok(())
--- a/src/wasm-lib/kcl/src/errors.rs
+++ b/src/wasm-lib/kcl/src/errors.rs
@ -1,5 +1,8 @@
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
+use tower_lsp::lsp_types::{Diagnostic, DiagnosticSeverity};
+
+use crate::executor::SourceRange;

 #[derive(Error, Debug, Serialize, Deserialize, ts_rs::TS)]
 #[ts(export)]
@ -29,7 +32,7 @@ pub enum KclError {
 #[ts(export)]
 pub struct KclErrorDetails {
    #[serde(rename = "sourceRanges")]
-    pub source_ranges: Vec<crate::executor::SourceRange>,
+    pub source_ranges: Vec<SourceRange>,
    #[serde(rename = "msg")]
    pub message: String,
 }
@ -61,6 +64,37 @@ impl KclError {

        (format!("{}: {}", type_, message), line, column)
    }
+
+    pub fn source_ranges(&self) -> Vec<SourceRange> {
+        match &self {
+            KclError::Syntax(e) => e.source_ranges.clone(),
+            KclError::Semantic(e) => e.source_ranges.clone(),
+            KclError::Type(e) => e.source_ranges.clone(),
+            KclError::Unimplemented(e) => e.source_ranges.clone(),
+            KclError::Unexpected(e) => e.source_ranges.clone(),
+            KclError::ValueAlreadyDefined(e) => e.source_ranges.clone(),
+            KclError::UndefinedValue(e) => e.source_ranges.clone(),
+            KclError::InvalidExpression(e) => e.source_ranges.clone(),
+            KclError::Engine(e) => e.source_ranges.clone(),
+        }
+    }
+    pub fn to_lsp_diagnostic(&self, code: &str) -> Diagnostic {
+        let (message, _, _) = self.get_message_line_column(code);
+        let source_ranges = self.source_ranges();
+
+        Diagnostic {
+            range: source_ranges.first().map(|r| r.to_lsp_range(code)).unwrap_or_default(),
+            severity: Some(DiagnosticSeverity::ERROR),
+            code: None,
+            // TODO: this is neat we can pass a URL to a help page here for this specific error.
+            code_description: None,
+            source: Some("kcl".to_string()),
+            message,
+            related_information: None,
+            tags: None,
+            data: None,
+        }
+    }
 }

 /// This is different than to_string() in that it will serialize the Error
--- a/src/wasm-lib/kcl/src/executor.rs
+++ b/src/wasm-lib/kcl/src/executor.rs
@ -5,9 +5,10 @@ use std::collections::HashMap;
 use anyhow::Result;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
+use tower_lsp::lsp_types::{Position as LspPosition, Range as LspRange};

 use crate::{
-    abstract_syntax_tree_types::{BodyItem, FunctionExpression, Value},
+    abstract_syntax_tree_types::{BodyItem, Function, FunctionExpression, Value},
    engine::EngineConnection,
    errors::{KclError, KclErrorDetails},
 };
@ -281,10 +282,65 @@ pub struct Position(pub [f64; 3]);
 #[ts(export)]
 pub struct Rotation(pub [f64; 4]);

-#[derive(Debug, Default, Deserialize, Serialize, PartialEq, Copy, Clone, ts_rs::TS, JsonSchema)]
+#[derive(Debug, Default, Deserialize, Serialize, PartialEq, Copy, Clone, ts_rs::TS, JsonSchema, Hash, Eq)]
 #[ts(export)]
 pub struct SourceRange(pub [usize; 2]);

+impl SourceRange {
+    /// Create a new source range.
+    pub fn new(start: usize, end: usize) -> Self {
+        Self([start, end])
+    }
+
+    /// Get the start of the range.
+    pub fn start(&self) -> usize {
+        self.0[0]
+    }
+
+    /// Get the end of the range.
+    pub fn end(&self) -> usize {
+        self.0[1]
+    }
+
+    /// Check if the range contains a position.
+    pub fn contains(&self, pos: usize) -> bool {
+        pos >= self.start() && pos <= self.end()
+    }
+
+    pub fn start_to_lsp_position(&self, code: &str) -> LspPosition {
+        // Calculate the line and column of the error from the source range.
+        // Lines are zero indexed in vscode so we need to subtract 1.
+        let mut line = code[..self.start()].lines().count();
+        if line > 0 {
+            line = line.saturating_sub(1);
+        }
+        let column = code[..self.start()].lines().last().map(|l| l.len()).unwrap_or_default();
+
+        LspPosition {
+            line: line as u32,
+            character: column as u32,
+        }
+    }
+
+    pub fn end_to_lsp_position(&self, code: &str) -> LspPosition {
+        // Calculate the line and column of the error from the source range.
+        // Lines are zero indexed in vscode so we need to subtract 1.
+        let line = code[..self.end()].lines().count() - 1;
+        let column = code[..self.end()].lines().last().map(|l| l.len()).unwrap_or_default();
+
+        LspPosition {
+            line: line as u32,
+            character: column as u32,
+        }
+    }
+
+    pub fn to_lsp_range(&self, code: &str) -> LspRange {
+        let start = self.start_to_lsp_position(code);
+        let end = self.end_to_lsp_position(code);
+        LspRange { start, end }
+    }
+}
+
 #[derive(Debug, Deserialize, Serialize, PartialEq, Clone, ts_rs::TS, JsonSchema)]
 #[ts(export)]
 pub struct Point2d {
@ -298,12 +354,24 @@ impl From<[f64; 2]> for Point2d {
    }
 }

+impl From<&[f64; 2]> for Point2d {
+    fn from(p: &[f64; 2]) -> Self {
+        Self { x: p[0], y: p[1] }
+    }
+}
+
 impl From<Point2d> for [f64; 2] {
    fn from(p: Point2d) -> Self {
        [p.x, p.y]
    }
 }

+impl From<Point2d> for kittycad::types::Point2D {
+    fn from(p: Point2d) -> Self {
+        Self { x: p.x, y: p.y }
+    }
+}
+
 #[derive(Debug, Deserialize, Serialize, PartialEq, Clone, ts_rs::TS, JsonSchema)]
 #[ts(export)]
 pub struct Point3d {
@ -497,7 +565,6 @@ pub fn execute(
    engine: &mut EngineConnection,
 ) -> Result<ProgramMemory, KclError> {
    let mut pipe_info = PipeInfo::default();
-    let stdlib = crate::std::StdLib::new();

    // Iterate over the body of the program.
    for statement in &program.body {
@ -517,7 +584,8 @@ pub fn execute(
                            _ => (),
                        }
                    }
-                    if fn_name == "show" {
+                    let _show_fn = Box::new(crate::std::Show);
+                    if let Function::StdLib { func: _show_fn } = &call_expr.function {
                        if options != BodyType::Root {
                            return Err(KclError::Semantic(KclErrorDetails {
                                message: "Cannot call show outside of a root".to_string(),
@ -551,7 +619,7 @@ pub fn execute(
                            memory.add(&var_name, value.clone(), source_range)?;
                        }
                        Value::BinaryExpression(binary_expression) => {
-                            let result = binary_expression.get_result(memory, &mut pipe_info, &stdlib, engine)?;
+                            let result = binary_expression.get_result(memory, &mut pipe_info, engine)?;
                            memory.add(&var_name, result, source_range)?;
                        }
                        Value::FunctionExpression(function_expression) => {
@ -574,7 +642,7 @@ pub fn execute(
                                        for (index, param) in function_expression.params.iter().enumerate() {
                                            fn_memory.add(
                                                &param.name,
-                                                args.clone().get(index).unwrap().clone(),
+                                                args.get(index).unwrap().clone(),
                                                param.into(),
                                            )?;
                                        }
@ -588,11 +656,11 @@ pub fn execute(
                            )?;
                        }
                        Value::CallExpression(call_expression) => {
-                            let result = call_expression.execute(memory, &mut pipe_info, &stdlib, engine)?;
+                            let result = call_expression.execute(memory, &mut pipe_info, engine)?;
                            memory.add(&var_name, result, source_range)?;
                        }
                        Value::PipeExpression(pipe_expression) => {
-                            let result = pipe_expression.get_result(memory, &mut pipe_info, &stdlib, engine)?;
+                            let result = pipe_expression.get_result(memory, &mut pipe_info, engine)?;
                            memory.add(&var_name, result, source_range)?;
                        }
                        Value::PipeSubstitution(pipe_substitution) => {
@ -605,11 +673,11 @@ pub fn execute(
                            }));
                        }
                        Value::ArrayExpression(array_expression) => {
-                            let result = array_expression.execute(memory, &mut pipe_info, &stdlib, engine)?;
+                            let result = array_expression.execute(memory, &mut pipe_info, engine)?;
                            memory.add(&var_name, result, source_range)?;
                        }
                        Value::ObjectExpression(object_expression) => {
-                            let result = object_expression.execute(memory, &mut pipe_info, &stdlib, engine)?;
+                            let result = object_expression.execute(memory, &mut pipe_info, engine)?;
                            memory.add(&var_name, result, source_range)?;
                        }
                        Value::MemberExpression(member_expression) => {
@ -617,7 +685,7 @@ pub fn execute(
                            memory.add(&var_name, result, source_range)?;
                        }
                        Value::UnaryExpression(unary_expression) => {
-                            let result = unary_expression.get_result(memory, &mut pipe_info, &stdlib, engine)?;
+                            let result = unary_expression.get_result(memory, &mut pipe_info, engine)?;
                            memory.add(&var_name, result, source_range)?;
                        }
                    }
@ -625,7 +693,7 @@ pub fn execute(
            }
            BodyItem::ReturnStatement(return_statement) => match &return_statement.argument {
                Value::BinaryExpression(bin_expr) => {
-                    let result = bin_expr.get_result(memory, &mut pipe_info, &stdlib, engine)?;
+                    let result = bin_expr.get_result(memory, &mut pipe_info, engine)?;
                    memory.return_ = Some(ProgramReturn::Value(result));
                }
                Value::Identifier(identifier) => {
@ -648,7 +716,8 @@ mod tests {

    pub async fn parse_execute(code: &str) -> Result<ProgramMemory> {
        let tokens = crate::tokeniser::lexer(code);
-        let program = crate::parser::abstract_syntax_tree(&tokens)?;
+        let parser = crate::parser::Parser::new(tokens);
+        let program = parser.ast()?;
        let mut mem: ProgramMemory = Default::default();
        let mut engine = EngineConnection::new().await?;
        let memory = execute(program, &mut mem, BodyType::Root, &mut engine)?;
@ -761,6 +830,28 @@ const part001 = startSketchAt([0, 0])
  legLen(segLen('seg01', %), myVar)
 ], %)

+show(part001)"#;
+
+        parse_execute(ast).await.unwrap();
+    }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn test_execute_with_inline_comment() {
+        let ast = r#"const baseThick = 1
+const armAngle = 60
+
+const baseThickHalf = baseThick / 2
+const halfArmAngle = armAngle / 2
+
+const arrExpShouldNotBeIncluded = [1, 2, 3]
+const objExpShouldNotBeIncluded = { a: 1, b: 2, c: 3 }
+
+const part001 = startSketchAt([0, 0])
+  |> yLineTo(1, %)
+  |> xLine(3.84, %) // selection-range-7ish-before-this
+
+const variableBelowShouldNotBeIncluded = 3
+
 show(part001)"#;

        parse_execute(ast).await.unwrap();
--- a/src/wasm-lib/kcl/src/lib.rs
+++ b/src/wasm-lib/kcl/src/lib.rs
@ -1,10 +1,10 @@
 pub mod abstract_syntax_tree_types;
-mod docs;
+pub mod docs;
 pub mod engine;
 pub mod errors;
 pub mod executor;
 pub mod math_parser;
 pub mod parser;
-pub mod recast;
+pub mod server;
 pub mod std;
 pub mod tokeniser;
--- a/src/wasm-lib/kcl/src/math_parser.rs
+++ b/src/wasm-lib/kcl/src/math_parser.rs
--- a/src/wasm-lib/kcl/src/parser.rs
+++ b/src/wasm-lib/kcl/src/parser.rs
--- a/src/wasm-lib/kcl/src/recast.rs
+++ b/src/wasm-lib/kcl/src/recast.rs
@ -1,347 +0,0 @@
-//! Generates source code from the AST.
-//! The inverse of parsing (which generates an AST from the source code)
-
-use crate::abstract_syntax_tree_types::{
-    ArrayExpression, BinaryExpression, BinaryPart, BodyItem, CallExpression, FunctionExpression, Literal,
-    LiteralIdentifier, MemberExpression, MemberObject, ObjectExpression, PipeExpression, Program, UnaryExpression,
-    Value,
-};
-
-fn recast_literal(literal: Literal) -> String {
-    if let serde_json::Value::String(value) = literal.value {
-        let quote = if literal.raw.trim().starts_with('"') { '"' } else { '\'' };
-        format!("{}{}{}", quote, value, quote)
-    } else {
-        literal.value.to_string()
-    }
-}
-
-fn precedence(operator: &str) -> u8 {
-    match operator {
-        "+" | "-" => 11,
-        "*" | "/" | "%" => 12,
-        _ => 0,
-    }
-}
-
-fn recast_binary_expression(expression: BinaryExpression) -> String {
-    let maybe_wrap_it = |a: String, doit: bool| -> String {
-        if doit {
-            format!("({})", a)
-        } else {
-            a
-        }
-    };
-
-    let should_wrap_right = match expression.right.clone() {
-        BinaryPart::BinaryExpression(bin_exp) => {
-            precedence(&expression.operator) > precedence(&bin_exp.operator) || expression.operator == "-"
-        }
-        _ => false,
-    };
-
-    let should_wrap_left = match expression.left.clone() {
-        BinaryPart::BinaryExpression(bin_exp) => precedence(&expression.operator) > precedence(&bin_exp.operator),
-        _ => false,
-    };
-
-    format!(
-        "{} {} {}",
-        maybe_wrap_it(recast_binary_part(expression.left), should_wrap_left),
-        expression.operator,
-        maybe_wrap_it(recast_binary_part(expression.right), should_wrap_right)
-    )
-}
-
-fn recast_binary_part(part: BinaryPart) -> String {
-    match part {
-        BinaryPart::Literal(literal) => recast_literal(*literal),
-        BinaryPart::Identifier(identifier) => identifier.name,
-        BinaryPart::BinaryExpression(binary_expression) => recast_binary_expression(*binary_expression),
-        BinaryPart::CallExpression(call_expression) => recast_call_expression(&call_expression, "", false),
-        _ => String::new(),
-    }
-}
-
-fn recast_value(node: Value, _indentation: String, is_in_pipe_expression: bool) -> String {
-    let indentation = _indentation + if is_in_pipe_expression { "  " } else { "" };
-    match node {
-        Value::BinaryExpression(bin_exp) => recast_binary_expression(*bin_exp),
-        Value::ArrayExpression(array_exp) => recast_array_expression(&array_exp, &indentation),
-        Value::ObjectExpression(ref obj_exp) => recast_object_expression(obj_exp, &indentation, is_in_pipe_expression),
-        Value::MemberExpression(mem_exp) => recast_member_expression(*mem_exp),
-        Value::Literal(literal) => recast_literal(*literal),
-        Value::FunctionExpression(func_exp) => recast_function(*func_exp),
-        Value::CallExpression(call_exp) => recast_call_expression(&call_exp, &indentation, is_in_pipe_expression),
-        Value::Identifier(ident) => ident.name,
-        Value::PipeExpression(pipe_exp) => recast_pipe_expression(&pipe_exp),
-        Value::UnaryExpression(unary_exp) => recast_unary_expression(*unary_exp),
-        _ => String::new(),
-    }
-}
-
-fn recast_array_expression(expression: &ArrayExpression, indentation: &str) -> String {
-    let flat_recast = format!(
-        "[{}]",
-        expression
-            .elements
-            .iter()
-            .map(|el| recast_value(el.clone(), String::new(), false))
-            .collect::<Vec<String>>()
-            .join(", ")
-    );
-    let max_array_length = 40;
-    if flat_recast.len() > max_array_length {
-        let _indentation = indentation.to_string() + "  ";
-        format!(
-            "[\n{}{}\n{}]",
-            _indentation,
-            expression
-                .elements
-                .iter()
-                .map(|el| recast_value(el.clone(), _indentation.clone(), false))
-                .collect::<Vec<String>>()
-                .join(format!(",\n{}", _indentation).as_str()),
-            indentation
-        )
-    } else {
-        flat_recast
-    }
-}
-
-fn recast_object_expression(expression: &ObjectExpression, indentation: &str, is_in_pipe_expression: bool) -> String {
-    let flat_recast = format!(
-        "{{ {} }}",
-        expression
-            .properties
-            .iter()
-            .map(|prop| {
-                format!(
-                    "{}: {}",
-                    prop.key.name,
-                    recast_value(prop.value.clone(), String::new(), false)
-                )
-            })
-            .collect::<Vec<String>>()
-            .join(", ")
-    );
-    let max_array_length = 40;
-    if flat_recast.len() > max_array_length {
-        let _indentation = indentation.to_owned() + "  ";
-        format!(
-            "{{\n{}{}\n{}}}",
-            _indentation,
-            expression
-                .properties
-                .iter()
-                .map(|prop| {
-                    format!(
-                        "{}: {}",
-                        prop.key.name,
-                        recast_value(prop.value.clone(), _indentation.clone(), is_in_pipe_expression)
-                    )
-                })
-                .collect::<Vec<String>>()
-                .join(format!(",\n{}", _indentation).as_str()),
-            if is_in_pipe_expression { "    " } else { "" }
-        )
-    } else {
-        flat_recast
-    }
-}
-
-fn recast_call_expression(expression: &CallExpression, indentation: &str, is_in_pipe_expression: bool) -> String {
-    format!(
-        "{}({})",
-        expression.callee.name,
-        expression
-            .arguments
-            .iter()
-            .map(|arg| recast_argument(arg.clone(), indentation, is_in_pipe_expression))
-            .collect::<Vec<String>>()
-            .join(", ")
-    )
-}
-
-fn recast_argument(argument: Value, indentation: &str, is_in_pipe_expression: bool) -> String {
-    match argument {
-        Value::Literal(literal) => recast_literal(*literal),
-        Value::Identifier(identifier) => identifier.name,
-        Value::BinaryExpression(binary_exp) => recast_binary_expression(*binary_exp),
-        Value::ArrayExpression(array_exp) => recast_array_expression(&array_exp, indentation),
-        Value::ObjectExpression(object_exp) => {
-            recast_object_expression(&object_exp, indentation, is_in_pipe_expression)
-        }
-        Value::CallExpression(call_exp) => recast_call_expression(&call_exp, indentation, is_in_pipe_expression),
-        Value::FunctionExpression(function_exp) => recast_function(*function_exp),
-        Value::PipeSubstitution(_) => "%".to_string(),
-        Value::UnaryExpression(unary_exp) => recast_unary_expression(*unary_exp),
-        _ => String::new(),
-    }
-}
-
-fn recast_member_expression(expression: MemberExpression) -> String {
-    let key_str = match expression.property {
-        LiteralIdentifier::Identifier(identifier) => {
-            if expression.computed {
-                format!("[{}]", &(*identifier.name))
-            } else {
-                format!(".{}", &(*identifier.name))
-            }
-        }
-        LiteralIdentifier::Literal(lit) => format!("[{}]", &(*lit.raw)),
-    };
-
-    match expression.object {
-        MemberObject::MemberExpression(member_exp) => recast_member_expression(*member_exp) + key_str.as_str(),
-        MemberObject::Identifier(identifier) => identifier.name + key_str.as_str(),
-    }
-}
-
-fn recast_pipe_expression(expression: &PipeExpression) -> String {
-    expression
-        .body
-        .iter()
-        .enumerate()
-        .map(|(index, statement)| {
-            let mut indentation = "  ".to_string();
-            let mut maybe_line_break = "\n".to_string();
-            let mut str = recast_value(statement.clone(), indentation.clone(), true);
-            let non_code_meta = expression.non_code_meta.clone();
-            if let Some(non_code_meta_value) = non_code_meta.none_code_nodes.get(&index) {
-                if non_code_meta_value.value != " " {
-                    str += non_code_meta_value.value.as_str();
-                    indentation = String::new();
-                    maybe_line_break = String::new();
-                }
-            }
-
-            if index != expression.body.len() - 1 {
-                str += maybe_line_break.as_str();
-                str += indentation.as_str();
-                str += "|> ".to_string().as_str();
-            }
-            str
-        })
-        .collect::<String>()
-}
-
-fn recast_unary_expression(expression: UnaryExpression) -> String {
-    let bin_part_val = match expression.argument {
-        BinaryPart::Literal(literal) => Value::Literal(literal),
-        BinaryPart::Identifier(identifier) => Value::Identifier(identifier),
-        BinaryPart::BinaryExpression(binary_expression) => Value::BinaryExpression(binary_expression),
-        BinaryPart::CallExpression(call_expression) => Value::CallExpression(call_expression),
-        BinaryPart::UnaryExpression(unary_expression) => Value::UnaryExpression(unary_expression),
-    };
-    format!(
-        "{}{}",
-        expression.operator,
-        recast_value(bin_part_val, String::new(), false)
-    )
-}
-
-pub fn recast(ast: &Program, indentation: &str, is_with_block: bool) -> String {
-    ast.body
-        .iter()
-        .map(|statement| match statement.clone() {
-            BodyItem::ExpressionStatement(expression_statement) => match expression_statement.expression {
-                Value::BinaryExpression(binary_expression) => recast_binary_expression(*binary_expression),
-                Value::ArrayExpression(array_expression) => recast_array_expression(&array_expression, ""),
-                Value::ObjectExpression(object_expression) => recast_object_expression(&object_expression, "", false),
-                Value::CallExpression(call_expression) => recast_call_expression(&call_expression, "", false),
-                _ => "Expression".to_string(),
-            },
-            BodyItem::VariableDeclaration(variable_declaration) => variable_declaration
-                .declarations
-                .iter()
-                .map(|declaration| {
-                    format!(
-                        "{} {} = {}",
-                        variable_declaration.kind,
-                        declaration.id.name,
-                        recast_value(declaration.init.clone(), String::new(), false)
-                    )
-                })
-                .collect::<String>(),
-            BodyItem::ReturnStatement(return_statement) => {
-                format!("return {}", recast_argument(return_statement.argument, "", false))
-            }
-        })
-        .enumerate()
-        .map(|(index, recast_str)| {
-            let is_legit_custom_whitespace_or_comment = |str: String| str != " " && str != "\n" && str != "  ";
-
-            // determine the value of startString
-            let last_white_space_or_comment = if index > 0 {
-                let tmp = if let Some(non_code_node) = ast.non_code_meta.none_code_nodes.get(&(index - 1)) {
-                    non_code_node.value.clone()
-                } else {
-                    " ".to_string()
-                };
-                tmp
-            } else {
-                " ".to_string()
-            };
-            // indentation of this line will be covered by the previous if we're using a custom whitespace or comment
-            let mut start_string = if is_legit_custom_whitespace_or_comment(last_white_space_or_comment) {
-                String::new()
-            } else {
-                indentation.to_owned()
-            };
-            if index == 0 {
-                if let Some(start) = ast.non_code_meta.start.clone() {
-                    start_string = start.value;
-                } else {
-                    start_string = indentation.to_owned();
-                }
-            }
-            if start_string.ends_with('\n') {
-                start_string += indentation;
-            }
-
-            // determine the value of endString
-            let maybe_line_break: String = if index == ast.body.len() - 1 && !is_with_block {
-                String::new()
-            } else {
-                "\n".to_string()
-            };
-            let mut custom_white_space_or_comment = match ast.non_code_meta.none_code_nodes.get(&index) {
-                Some(custom_white_space_or_comment) => custom_white_space_or_comment.value.clone(),
-                None => String::new(),
-            };
-            if !is_legit_custom_whitespace_or_comment(custom_white_space_or_comment.clone()) {
-                custom_white_space_or_comment = String::new();
-            }
-            let end_string = if custom_white_space_or_comment.is_empty() {
-                maybe_line_break
-            } else {
-                custom_white_space_or_comment
-            };
-
-            format!("{}{}{}", start_string, recast_str, end_string)
-        })
-        .collect::<String>()
-}
-
-pub fn recast_function(expression: FunctionExpression) -> String {
-    format!(
-        "({}) => {{{}}}",
-        expression
-            .params
-            .iter()
-            .map(|param| param.name.clone())
-            .collect::<Vec<String>>()
-            .join(", "),
-        recast(
-            &Program {
-                start: expression.body.start,
-                end: expression.body.start,
-                body: expression.body.body,
-                non_code_meta: expression.body.non_code_meta
-            },
-            "",
-            true
-        )
-    )
-}
--- a/src/wasm-lib/kcl/src/server/mod.rs
+++ b/src/wasm-lib/kcl/src/server/mod.rs
@ -0,0 +1,672 @@
+//! Functions for the `kcl` lsp server.
+
+use std::collections::HashMap;
+
+use anyhow::Result;
+use clap::Parser;
+use dashmap::DashMap;
+use tower_lsp::{jsonrpc::Result as RpcResult, lsp_types::*, Client, LanguageServer};
+
+use crate::{abstract_syntax_tree_types::VariableKind, executor::SourceRange, parser::PIPE_OPERATOR};
+
+/// A subcommand for running the server.
+#[derive(Parser, Clone, Debug)]
+pub struct Server {
+    /// Port that the server should listen
+    #[clap(long, default_value = "8080")]
+    pub socket: i32,
+
+    /// Listen over stdin and stdout instead of a tcp socket.
+    #[clap(short, long, default_value = "false")]
+    pub stdio: bool,
+}
+
+/// The lsp server backend.
+pub struct Backend {
+    /// The client for the backend.
+    pub client: Client,
+    /// The stdlib completions for the language.
+    pub stdlib_completions: HashMap<String, CompletionItem>,
+    /// The stdlib signatures for the language.
+    pub stdlib_signatures: HashMap<String, SignatureHelp>,
+    /// The types of tokens the server supports.
+    pub token_types: Vec<SemanticTokenType>,
+    /// Token maps.
+    pub token_map: DashMap<String, Vec<crate::tokeniser::Token>>,
+    /// AST maps.
+    pub ast_map: DashMap<String, crate::abstract_syntax_tree_types::Program>,
+    /// Current code.
+    pub current_code_map: DashMap<String, String>,
+    /// Diagnostics.
+    pub diagnostics_map: DashMap<String, DocumentDiagnosticReport>,
+    /// Symbols map.
+    pub symbols_map: DashMap<String, Vec<DocumentSymbol>>,
+    /// Semantic tokens map.
+    pub semantic_tokens_map: DashMap<String, Vec<SemanticToken>>,
+}
+
+impl Backend {
+    fn get_semantic_token_type_index(&self, token_type: SemanticTokenType) -> Option<usize> {
+        self.token_types.iter().position(|x| *x == token_type)
+    }
+
+    async fn on_change(&self, params: TextDocumentItem) {
+        // Lets update the tokens.
+        self.current_code_map
+            .insert(params.uri.to_string(), params.text.clone());
+        let tokens = crate::tokeniser::lexer(&params.text);
+        self.token_map.insert(params.uri.to_string(), tokens.clone());
+
+        // Update the semantic tokens map.
+        let mut semantic_tokens = vec![];
+        let mut last_position = Position::new(0, 0);
+        for token in &tokens {
+            let Ok(mut token_type) = SemanticTokenType::try_from(token.token_type) else {
+                // We continue here because not all tokens can be converted this way, we will get
+                // the rest from the ast.
+                continue;
+            };
+
+            if token.token_type == crate::tokeniser::TokenType::Word
+                && self.stdlib_completions.contains_key(&token.value)
+            {
+                // This is a stdlib function.
+                token_type = SemanticTokenType::FUNCTION;
+            }
+
+            let token_type_index = match self.get_semantic_token_type_index(token_type.clone()) {
+                Some(index) => index,
+                // This is actually bad this should not fail.
+                // TODO: ensure we never get here.
+                None => {
+                    self.client
+                        .log_message(
+                            MessageType::INFO,
+                            format!("token type `{:?}` not accounted for", token_type),
+                        )
+                        .await;
+                    continue;
+                }
+            };
+
+            let source_range: SourceRange = token.clone().into();
+            let position = source_range.start_to_lsp_position(&params.text);
+
+            let semantic_token = SemanticToken {
+                delta_line: position.line - last_position.line,
+                delta_start: if position.line != last_position.line {
+                    position.character
+                } else {
+                    position.character - last_position.character
+                },
+                length: token.value.len() as u32,
+                token_type: token_type_index as u32,
+                token_modifiers_bitset: 0,
+            };
+
+            semantic_tokens.push(semantic_token);
+
+            last_position = position;
+        }
+        self.semantic_tokens_map.insert(params.uri.to_string(), semantic_tokens);
+
+        // Lets update the ast.
+        let parser = crate::parser::Parser::new(tokens);
+        let result = parser.ast();
+        let ast = match result {
+            Ok(ast) => ast,
+            Err(e) => {
+                let diagnostic = e.to_lsp_diagnostic(&params.text);
+                // We got errors, update the diagnostics.
+                self.diagnostics_map.insert(
+                    params.uri.to_string(),
+                    DocumentDiagnosticReport::Full(RelatedFullDocumentDiagnosticReport {
+                        related_documents: None,
+                        full_document_diagnostic_report: FullDocumentDiagnosticReport {
+                            result_id: None,
+                            items: vec![diagnostic.clone()],
+                        },
+                    }),
+                );
+
+                // Publish the diagnostic.
+                // If the client supports it.
+                self.client
+                    .publish_diagnostics(params.uri, vec![diagnostic], None)
+                    .await;
+
+                return;
+            }
+        };
+
+        // Update the symbols map.
+        self.symbols_map
+            .insert(params.uri.to_string(), ast.get_lsp_symbols(&params.text));
+
+        self.ast_map.insert(params.uri.to_string(), ast);
+        // Lets update the diagnostics, since we got no errors.
+        self.diagnostics_map.insert(
+            params.uri.to_string(),
+            DocumentDiagnosticReport::Full(RelatedFullDocumentDiagnosticReport {
+                related_documents: None,
+                full_document_diagnostic_report: FullDocumentDiagnosticReport {
+                    result_id: None,
+                    items: vec![],
+                },
+            }),
+        );
+
+        // Publish the diagnostic, we reset it here so the client knows the code compiles now.
+        // If the client supports it.
+        self.client.publish_diagnostics(params.uri.clone(), vec![], None).await;
+    }
+
+    async fn completions_get_variables_from_ast(&self, file_name: &str) -> Vec<CompletionItem> {
+        let mut completions = vec![];
+
+        let ast = match self.ast_map.get(file_name) {
+            Some(ast) => ast,
+            None => return completions,
+        };
+
+        for item in &ast.body {
+            match item {
+                crate::abstract_syntax_tree_types::BodyItem::ExpressionStatement(_) => continue,
+                crate::abstract_syntax_tree_types::BodyItem::ReturnStatement(_) => continue,
+                crate::abstract_syntax_tree_types::BodyItem::VariableDeclaration(variable) => {
+                    // We only want to complete variables.
+                    for declaration in &variable.declarations {
+                        completions.push(CompletionItem {
+                            label: declaration.id.name.to_string(),
+                            label_details: None,
+                            kind: Some(match variable.kind {
+                                crate::abstract_syntax_tree_types::VariableKind::Let => CompletionItemKind::VARIABLE,
+                                crate::abstract_syntax_tree_types::VariableKind::Const => CompletionItemKind::CONSTANT,
+                                crate::abstract_syntax_tree_types::VariableKind::Var => CompletionItemKind::VARIABLE,
+                                crate::abstract_syntax_tree_types::VariableKind::Fn => CompletionItemKind::FUNCTION,
+                            }),
+                            detail: Some(variable.kind.to_string()),
+                            documentation: None,
+                            deprecated: None,
+                            preselect: None,
+                            sort_text: None,
+                            filter_text: None,
+                            insert_text: None,
+                            insert_text_format: None,
+                            insert_text_mode: None,
+                            text_edit: None,
+                            additional_text_edits: None,
+                            command: None,
+                            commit_characters: None,
+                            data: None,
+                            tags: None,
+                        });
+                    }
+                }
+            }
+        }
+
+        completions
+    }
+}
+
+#[tower_lsp::async_trait]
+impl LanguageServer for Backend {
+    async fn initialize(&self, params: InitializeParams) -> RpcResult<InitializeResult> {
+        self.client
+            .log_message(MessageType::INFO, format!("initialize: {:?}", params))
+            .await;
+
+        Ok(InitializeResult {
+            capabilities: ServerCapabilities {
+                completion_provider: Some(CompletionOptions {
+                    resolve_provider: Some(false),
+                    trigger_characters: Some(vec![".".to_string()]),
+                    work_done_progress_options: Default::default(),
+                    all_commit_characters: None,
+                    ..Default::default()
+                }),
+                diagnostic_provider: Some(DiagnosticServerCapabilities::Options(DiagnosticOptions {
+                    ..Default::default()
+                })),
+                document_formatting_provider: Some(OneOf::Left(true)),
+                document_symbol_provider: Some(OneOf::Left(true)),
+                hover_provider: Some(HoverProviderCapability::Simple(true)),
+                inlay_hint_provider: Some(OneOf::Left(true)),
+                rename_provider: Some(OneOf::Left(true)),
+                semantic_tokens_provider: Some(SemanticTokensServerCapabilities::SemanticTokensRegistrationOptions(
+                    SemanticTokensRegistrationOptions {
+                        text_document_registration_options: {
+                            TextDocumentRegistrationOptions {
+                                document_selector: Some(vec![DocumentFilter {
+                                    language: Some("kcl".to_string()),
+                                    scheme: Some("file".to_string()),
+                                    pattern: None,
+                                }]),
+                            }
+                        },
+                        semantic_tokens_options: SemanticTokensOptions {
+                            work_done_progress_options: WorkDoneProgressOptions::default(),
+                            legend: SemanticTokensLegend {
+                                token_types: self.token_types.clone(),
+                                token_modifiers: vec![],
+                            },
+                            range: Some(false),
+                            full: Some(SemanticTokensFullOptions::Bool(true)),
+                        },
+                        static_registration_options: StaticRegistrationOptions::default(),
+                    },
+                )),
+                signature_help_provider: Some(SignatureHelpOptions {
+                    trigger_characters: None,
+                    retrigger_characters: None,
+                    ..Default::default()
+                }),
+                text_document_sync: Some(TextDocumentSyncCapability::Options(TextDocumentSyncOptions {
+                    open_close: Some(true),
+                    change: Some(TextDocumentSyncKind::FULL),
+                    ..Default::default()
+                })),
+                workspace: Some(WorkspaceServerCapabilities {
+                    workspace_folders: Some(WorkspaceFoldersServerCapabilities {
+                        supported: Some(true),
+                        change_notifications: Some(OneOf::Left(true)),
+                    }),
+                    file_operations: None,
+                }),
+                ..Default::default()
+            },
+            ..Default::default()
+        })
+    }
+
+    async fn initialized(&self, params: InitializedParams) {
+        self.client
+            .log_message(MessageType::INFO, format!("initialized: {:?}", params))
+            .await;
+    }
+
+    async fn shutdown(&self) -> RpcResult<()> {
+        self.client.log_message(MessageType::INFO, "shutdown".to_string()).await;
+        Ok(())
+    }
+
+    async fn did_change_workspace_folders(&self, _: DidChangeWorkspaceFoldersParams) {
+        self.client
+            .log_message(MessageType::INFO, "workspace folders changed!")
+            .await;
+    }
+
+    async fn did_change_configuration(&self, _: DidChangeConfigurationParams) {
+        self.client
+            .log_message(MessageType::INFO, "configuration changed!")
+            .await;
+    }
+
+    async fn did_change_watched_files(&self, _: DidChangeWatchedFilesParams) {
+        self.client
+            .log_message(MessageType::INFO, "watched files have changed!")
+            .await;
+    }
+
+    async fn did_open(&self, params: DidOpenTextDocumentParams) {
+        self.on_change(TextDocumentItem {
+            uri: params.text_document.uri,
+            text: params.text_document.text,
+            version: params.text_document.version,
+            language_id: params.text_document.language_id,
+        })
+        .await
+    }
+
+    async fn did_change(&self, mut params: DidChangeTextDocumentParams) {
+        self.on_change(TextDocumentItem {
+            uri: params.text_document.uri,
+            text: std::mem::take(&mut params.content_changes[0].text),
+            version: params.text_document.version,
+            language_id: Default::default(),
+        })
+        .await
+    }
+
+    async fn did_save(&self, params: DidSaveTextDocumentParams) {
+        if let Some(text) = params.text {
+            self.on_change(TextDocumentItem {
+                uri: params.text_document.uri,
+                text,
+                version: Default::default(),
+                language_id: Default::default(),
+            })
+            .await
+        }
+    }
+
+    async fn did_close(&self, _: DidCloseTextDocumentParams) {
+        self.client.log_message(MessageType::INFO, "file closed!").await;
+    }
+
+    async fn hover(&self, params: HoverParams) -> RpcResult<Option<Hover>> {
+        let filename = params.text_document_position_params.text_document.uri.to_string();
+
+        let Some(current_code) = self.current_code_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        let pos = position_to_char_index(params.text_document_position_params.position, &current_code);
+
+        // Let's iterate over the AST and find the node that contains the cursor.
+        let Some(ast) = self.ast_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        let Some(value) = ast.get_value_for_position(pos) else {
+            return Ok(None);
+        };
+
+        let Some(hover) = value.get_hover_value_for_position(pos, &current_code) else {
+            return Ok(None);
+        };
+
+        match hover {
+            crate::abstract_syntax_tree_types::Hover::Function { name, range } => {
+                // Get the docs for this function.
+                let Some(completion) = self.stdlib_completions.get(&name) else {
+                    return Ok(None);
+                };
+                let Some(docs) = &completion.documentation else {
+                    return Ok(None);
+                };
+
+                let docs = match docs {
+                    Documentation::String(docs) => docs,
+                    Documentation::MarkupContent(MarkupContent { value, .. }) => value,
+                };
+
+                let Some(label_details) = &completion.label_details else {
+                    return Ok(None);
+                };
+
+                Ok(Some(Hover {
+                    contents: HoverContents::Markup(MarkupContent {
+                        kind: MarkupKind::Markdown,
+                        value: format!(
+                            "```{}{}```\n{}",
+                            name,
+                            label_details.detail.clone().unwrap_or_default(),
+                            docs
+                        ),
+                    }),
+                    range: Some(range),
+                }))
+            }
+            crate::abstract_syntax_tree_types::Hover::Signature { .. } => Ok(None),
+        }
+    }
+
+    async fn completion(&self, params: CompletionParams) -> RpcResult<Option<CompletionResponse>> {
+        let mut completions = vec![CompletionItem {
+            label: PIPE_OPERATOR.to_string(),
+            label_details: None,
+            kind: Some(CompletionItemKind::OPERATOR),
+            detail: Some("A pipe operator.".to_string()),
+            documentation: Some(Documentation::MarkupContent(MarkupContent {
+                kind: MarkupKind::Markdown,
+                value: "A pipe operator.".to_string(),
+            })),
+            deprecated: Some(false),
+            preselect: None,
+            sort_text: None,
+            filter_text: None,
+            insert_text: Some("|> ".to_string()),
+            insert_text_format: Some(InsertTextFormat::PLAIN_TEXT),
+            insert_text_mode: None,
+            text_edit: None,
+            additional_text_edits: None,
+            command: None,
+            commit_characters: None,
+            data: None,
+            tags: None,
+        }];
+
+        completions.extend(self.stdlib_completions.values().cloned());
+
+        // Get our variables from our AST to include in our completions.
+        completions.extend(
+            self.completions_get_variables_from_ast(params.text_document_position.text_document.uri.as_ref())
+                .await,
+        );
+
+        Ok(Some(CompletionResponse::Array(completions)))
+    }
+
+    async fn diagnostic(&self, params: DocumentDiagnosticParams) -> RpcResult<DocumentDiagnosticReportResult> {
+        let filename = params.text_document.uri.to_string();
+
+        // Get the current diagnostics for this file.
+        let Some(diagnostic) = self.diagnostics_map.get(&filename) else {
+            // Send an empty report.
+            return Ok(DocumentDiagnosticReportResult::Report(DocumentDiagnosticReport::Full(
+                RelatedFullDocumentDiagnosticReport {
+                    related_documents: None,
+                    full_document_diagnostic_report: FullDocumentDiagnosticReport {
+                        result_id: None,
+                        items: vec![],
+                    },
+                },
+            )));
+        };
+
+        Ok(DocumentDiagnosticReportResult::Report(diagnostic.clone()))
+    }
+
+    async fn signature_help(&self, params: SignatureHelpParams) -> RpcResult<Option<SignatureHelp>> {
+        let filename = params.text_document_position_params.text_document.uri.to_string();
+
+        let Some(current_code) = self.current_code_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        let pos = position_to_char_index(params.text_document_position_params.position, &current_code);
+
+        // Let's iterate over the AST and find the node that contains the cursor.
+        let Some(ast) = self.ast_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        let Some(value) = ast.get_value_for_position(pos) else {
+            return Ok(None);
+        };
+
+        let Some(hover) = value.get_hover_value_for_position(pos, &current_code) else {
+            return Ok(None);
+        };
+
+        match hover {
+            crate::abstract_syntax_tree_types::Hover::Function { name, range: _ } => {
+                // Get the docs for this function.
+                let Some(signature) = self.stdlib_signatures.get(&name) else {
+                    return Ok(None);
+                };
+
+                Ok(Some(signature.clone()))
+            }
+            crate::abstract_syntax_tree_types::Hover::Signature {
+                name,
+                parameter_index,
+                range: _,
+            } => {
+                let Some(signature) = self.stdlib_signatures.get(&name) else {
+                    return Ok(None);
+                };
+
+                let mut signature = signature.clone();
+
+                signature.active_parameter = Some(parameter_index);
+
+                Ok(Some(signature.clone()))
+            }
+        }
+    }
+
+    async fn inlay_hint(&self, _params: InlayHintParams) -> RpcResult<Option<Vec<InlayHint>>> {
+        // TODO: do this
+
+        Ok(None)
+    }
+
+    async fn semantic_tokens_full(&self, params: SemanticTokensParams) -> RpcResult<Option<SemanticTokensResult>> {
+        let filename = params.text_document.uri.to_string();
+
+        let Some(semantic_tokens) = self.semantic_tokens_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        Ok(Some(SemanticTokensResult::Tokens(SemanticTokens {
+            result_id: None,
+            data: semantic_tokens.clone(),
+        })))
+    }
+
+    async fn document_symbol(&self, params: DocumentSymbolParams) -> RpcResult<Option<DocumentSymbolResponse>> {
+        let filename = params.text_document.uri.to_string();
+
+        let Some(symbols) = self.symbols_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        Ok(Some(DocumentSymbolResponse::Nested(symbols.clone())))
+    }
+
+    async fn formatting(&self, params: DocumentFormattingParams) -> RpcResult<Option<Vec<TextEdit>>> {
+        let filename = params.text_document.uri.to_string();
+
+        let Some(current_code) = self.current_code_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        // Parse the ast.
+        // I don't know if we need to do this again since it should be updated in the context.
+        // But I figure better safe than sorry since this will write back out to the file.
+        let tokens = crate::tokeniser::lexer(&current_code);
+        let parser = crate::parser::Parser::new(tokens);
+        let Ok(ast) = parser.ast() else {
+            return Ok(None);
+        };
+        // Now recast it.
+        let recast = ast.recast(
+            &crate::abstract_syntax_tree_types::FormatOptions {
+                tab_size: params.options.tab_size as usize,
+                insert_final_newline: params.options.insert_final_newline.unwrap_or(false),
+                use_tabs: !params.options.insert_spaces,
+            },
+            0,
+        );
+        let source_range = SourceRange([0, current_code.len() - 1]);
+        let range = source_range.to_lsp_range(&current_code);
+        Ok(Some(vec![TextEdit {
+            new_text: recast,
+            range,
+        }]))
+    }
+
+    async fn rename(&self, params: RenameParams) -> RpcResult<Option<WorkspaceEdit>> {
+        let filename = params.text_document_position.text_document.uri.to_string();
+
+        let Some(current_code) = self.current_code_map.get(&filename) else {
+            return Ok(None);
+        };
+
+        // Parse the ast.
+        // I don't know if we need to do this again since it should be updated in the context.
+        // But I figure better safe than sorry since this will write back out to the file.
+        let tokens = crate::tokeniser::lexer(&current_code);
+        let parser = crate::parser::Parser::new(tokens);
+        let Ok(mut ast) = parser.ast() else {
+            return Ok(None);
+        };
+
+        // Let's convert the position to a character index.
+        let pos = position_to_char_index(params.text_document_position.position, &current_code);
+        // Now let's perform the rename on the ast.
+        ast.rename_symbol(&params.new_name, pos);
+        // Now recast it.
+        let recast = ast.recast(&Default::default(), 0);
+        let source_range = SourceRange([0, current_code.len() - 1]);
+        let range = source_range.to_lsp_range(&current_code);
+        Ok(Some(WorkspaceEdit {
+            changes: Some(HashMap::from([(
+                params.text_document_position.text_document.uri,
+                vec![TextEdit {
+                    new_text: recast,
+                    range,
+                }],
+            )])),
+            document_changes: None,
+            change_annotations: None,
+        }))
+    }
+}
+
+/// Get completions from our stdlib.
+pub fn get_completions_from_stdlib(stdlib: &crate::std::StdLib) -> Result<HashMap<String, CompletionItem>> {
+    let mut completions = HashMap::new();
+
+    for internal_fn in stdlib.fns.values() {
+        completions.insert(internal_fn.name(), internal_fn.to_completion_item());
+    }
+
+    let variable_kinds = VariableKind::to_completion_items()?;
+    for variable_kind in variable_kinds {
+        completions.insert(variable_kind.label.clone(), variable_kind);
+    }
+
+    Ok(completions)
+}
+
+/// Get signatures from our stdlib.
+pub fn get_signatures_from_stdlib(stdlib: &crate::std::StdLib) -> Result<HashMap<String, SignatureHelp>> {
+    let mut signatures = HashMap::new();
+
+    for internal_fn in stdlib.fns.values() {
+        signatures.insert(internal_fn.name(), internal_fn.to_signature_help());
+    }
+
+    let show = SignatureHelp {
+        signatures: vec![SignatureInformation {
+            label: "show".to_string(),
+            documentation: Some(Documentation::MarkupContent(MarkupContent {
+                kind: MarkupKind::PlainText,
+                value: "Show a model.".to_string(),
+            })),
+            parameters: Some(vec![ParameterInformation {
+                label: ParameterLabel::Simple("sg: SketchGroup".to_string()),
+                documentation: Some(Documentation::MarkupContent(MarkupContent {
+                    kind: MarkupKind::PlainText,
+                    value: "A sketch group.".to_string(),
+                })),
+            }]),
+            active_parameter: None,
+        }],
+        active_signature: Some(0),
+        active_parameter: None,
+    };
+    signatures.insert("show".to_string(), show);
+
+    Ok(signatures)
+}
+
+/// Convert a position to a character index from the start of the file.
+fn position_to_char_index(position: Position, code: &str) -> usize {
+    // Get the character position from the start of the file.
+    let mut char_position = 0;
+    for (index, line) in code.lines().enumerate() {
+        if index == position.line as usize {
+            char_position += position.character as usize;
+            break;
+        } else {
+            char_position += line.len() + 1;
+        }
+    }
+
+    char_position
+}
--- a/src/wasm-lib/kcl/src/std/mod.rs
+++ b/src/wasm-lib/kcl/src/std/mod.rs
@ -5,9 +5,6 @@ pub mod segment;
 pub mod sketch;
 pub mod utils;

-// TODO: Something that would be nice is if we could generate docs for Kcl based on the
-// actual stdlib functions below.
-
 use std::collections::HashMap;

 use anyhow::Result;
@ -23,19 +20,17 @@ use crate::{
    executor::{ExtrudeGroup, MemoryItem, Metadata, SketchGroup, SourceRange},
 };

-pub type FnMap = HashMap<String, StdFn>;
 pub type StdFn = fn(&mut Args) -> Result<MemoryItem, KclError>;
+pub type FnMap = HashMap<String, StdFn>;

 pub struct StdLib {
-    #[allow(dead_code)]
-    internal_fn_names: Vec<Box<(dyn crate::docs::StdLibFn)>>,
-
-    pub fns: FnMap,
+    pub fns: HashMap<String, Box<(dyn crate::docs::StdLibFn)>>,
 }

 impl StdLib {
    pub fn new() -> Self {
-        let internal_fn_names: Vec<Box<(dyn crate::docs::StdLibFn)>> = vec![
+        let internal_fns: Vec<Box<(dyn crate::docs::StdLibFn)>> = vec![
+            Box::new(Show),
            Box::new(Min),
            Box::new(LegLen),
            Box::new(LegAngX),
@ -64,14 +59,20 @@ impl StdLib {
            Box::new(crate::std::sketch::AngledLineThatIntersects),
            Box::new(crate::std::sketch::StartSketchAt),
            Box::new(crate::std::sketch::Close),
+            Box::new(crate::std::sketch::Arc),
+            Box::new(crate::std::sketch::BezierCurve),
        ];

        let mut fns = HashMap::new();
-        for internal_fn_name in &internal_fn_names {
-            fns.insert(internal_fn_name.name().to_string(), internal_fn_name.std_lib_fn());
+        for internal_fn in &internal_fns {
+            fns.insert(internal_fn.name().to_string(), internal_fn.clone());
        }

-        Self { internal_fn_names, fns }
+        Self { fns }
+    }
+
+    pub fn get(&self, name: &str) -> Option<Box<dyn crate::docs::StdLibFn>> {
+        self.fns.get(name).cloned()
    }
 }

@ -406,7 +407,6 @@ impl<'a> Args<'a> {
 }

 /// Returns the minimum of the given arguments.
-/// TODO fix min
 pub fn min(args: &mut Args) -> Result<MemoryItem, KclError> {
    let nums = args.get_number_array()?;
    let result = inner_min(nums);
@ -429,6 +429,21 @@ fn inner_min(args: Vec<f64>) -> f64 {
    min
 }

+/// Render a model.
+// This never actually gets called so this is fine.
+pub fn show(args: &mut Args) -> Result<MemoryItem, KclError> {
+    let sketch_group = args.get_sketch_group()?;
+    inner_show(sketch_group);
+
+    args.make_user_val_from_f64(0.0)
+}
+
+/// Render a model.
+#[stdlib {
+    name = "show",
+}]
+fn inner_show(_sketch: SketchGroup) {}
+
 /// Returns the length of the given leg.
 pub fn leg_length(args: &mut Args) -> Result<MemoryItem, KclError> {
    let (hypotenuse, leg) = args.get_hypotenuse_leg()?;
@ -492,6 +507,7 @@ pub enum Primitive {
 #[cfg(test)]
 mod tests {
    use crate::std::StdLib;
+    use itertools::Itertools;

    #[test]
    fn test_generate_stdlib_markdown_docs() {
@ -507,7 +523,8 @@ mod tests {

        buf.push_str("* [Functions](#functions)\n");

-        for internal_fn in &stdlib.internal_fn_names {
+        for key in stdlib.fns.keys().sorted() {
+            let internal_fn = stdlib.fns.get(key).unwrap();
            if internal_fn.unpublished() || internal_fn.deprecated() {
                continue;
            }
@ -519,7 +536,8 @@ mod tests {

        buf.push_str("## Functions\n\n");

-        for internal_fn in &stdlib.internal_fn_names {
+        for key in stdlib.fns.keys().sorted() {
+            let internal_fn = stdlib.fns.get(key).unwrap();
            if internal_fn.unpublished() {
                continue;
            }
@ -536,15 +554,8 @@ mod tests {
            fn_docs.push_str(&format!("{}\n\n", internal_fn.description()));

            fn_docs.push_str("```\n");
-            fn_docs.push_str(&format!("{}(", internal_fn.name()));
-            for (i, arg) in internal_fn.args().iter().enumerate() {
-                if i > 0 {
-                    fn_docs.push_str(", ");
-                }
-                fn_docs.push_str(&format!("{}: {}", arg.name, arg.type_));
-            }
-            fn_docs.push_str(") -> ");
-            fn_docs.push_str(&internal_fn.return_value().type_);
+            let signature = internal_fn.fn_signature();
+            fn_docs.push_str(&signature);
            fn_docs.push_str("\n```\n\n");

            fn_docs.push_str("#### Arguments\n\n");
@ -561,17 +572,18 @@ mod tests {
                }
            }

-            fn_docs.push_str("\n#### Returns\n\n");
-            let return_type = internal_fn.return_value();
-            if let Some(description) = return_type.description() {
-                fn_docs.push_str(&format!("* `{}` - {}\n", return_type.type_, description));
-            } else {
-                fn_docs.push_str(&format!("* `{}`\n", return_type.type_));
-            }
+            if let Some(return_type) = internal_fn.return_value() {
+                fn_docs.push_str("\n#### Returns\n\n");
+                if let Some(description) = return_type.description() {
+                    fn_docs.push_str(&format!("* `{}` - {}\n", return_type.type_, description));
+                } else {
+                    fn_docs.push_str(&format!("* `{}`\n", return_type.type_));
+                }

-            let (format, should_be_indented) = return_type.get_type_string().unwrap();
-            if should_be_indented {
-                fn_docs.push_str(&format!("```\n{}\n```\n", format));
+                let (format, should_be_indented) = return_type.get_type_string().unwrap();
+                if should_be_indented {
+                    fn_docs.push_str(&format!("```\n{}\n```\n", format));
+                }
            }

            fn_docs.push_str("\n\n\n");
@ -588,7 +600,8 @@ mod tests {

        let mut json_data = vec![];

-        for internal_fn in &stdlib.internal_fn_names {
+        for key in stdlib.fns.keys().sorted() {
+            let internal_fn = stdlib.fns.get(key).unwrap();
            json_data.push(internal_fn.to_json().unwrap());
        }

--- a/src/wasm-lib/kcl/src/std/sketch.rs
+++ b/src/wasm-lib/kcl/src/std/sketch.rs
@ -10,7 +10,7 @@ use crate::{
    errors::{KclError, KclErrorDetails},
    executor::{BasePath, GeoMeta, MemoryItem, Path, Point2d, Position, Rotation, SketchGroup},
    std::{
-        utils::{get_x_component, get_y_component, intersection_with_parallel_line},
+        utils::{arc_angles, arc_center_and_end, get_x_component, get_y_component, intersection_with_parallel_line},
        Args,
    },
 };
@ -43,7 +43,7 @@ pub fn line_to(args: &mut Args) -> Result<MemoryItem, KclError> {
 #[stdlib {
    name = "lineTo",
 }]
-fn inner_line_to(data: LineToData, sketch_group: SketchGroup, args: &Args) -> Result<SketchGroup, KclError> {
+fn inner_line_to(data: LineToData, sketch_group: SketchGroup, args: &mut Args) -> Result<SketchGroup, KclError> {
    let from = sketch_group.get_coords_from_paths()?;
    let to = match data {
        LineToData::PointWithTag { to, .. } => to,
@ -51,6 +51,21 @@ fn inner_line_to(data: LineToData, sketch_group: SketchGroup, args: &Args) -> Re
    };

    let id = uuid::Uuid::new_v4();
+
+    args.send_modeling_cmd(
+        id,
+        ModelingCmd::ExtendPath {
+            path: sketch_group.id,
+            segment: kittycad::types::PathSegment::Line {
+                end: Point3D {
+                    x: to[0],
+                    y: to[1],
+                    z: 0.0,
+                },
+            },
+        },
+    )?;
+
    let current_path = Path::ToPoint {
        base: BasePath {
            from: from.into(),
@ -101,7 +116,7 @@ pub fn x_line_to(args: &mut Args) -> Result<MemoryItem, KclError> {
 #[stdlib {
    name = "xLineTo",
 }]
-fn inner_x_line_to(data: AxisLineToData, sketch_group: SketchGroup, args: &Args) -> Result<SketchGroup, KclError> {
+fn inner_x_line_to(data: AxisLineToData, sketch_group: SketchGroup, args: &mut Args) -> Result<SketchGroup, KclError> {
    let from = sketch_group.get_coords_from_paths()?;

    let line_to_data = match data {
@ -126,7 +141,7 @@ pub fn y_line_to(args: &mut Args) -> Result<MemoryItem, KclError> {
 #[stdlib {
    name = "yLineTo",
 }]
-fn inner_y_line_to(data: AxisLineToData, sketch_group: SketchGroup, args: &Args) -> Result<SketchGroup, KclError> {
+fn inner_y_line_to(data: AxisLineToData, sketch_group: SketchGroup, args: &mut Args) -> Result<SketchGroup, KclError> {
    let from = sketch_group.get_coords_from_paths()?;

    let line_to_data = match data {
@ -716,6 +731,248 @@ fn inner_close(sketch_group: SketchGroup, args: &mut Args) -> Result<SketchGroup
    Ok(new_sketch_group)
 }

+/// Data to draw an arc.
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
+#[ts(export)]
+#[serde(rename_all = "camelCase", untagged)]
+pub enum ArcData {
+    /// Angles and radius with a tag.
+    AnglesAndRadiusWithTag {
+        /// The start angle.
+        angle_start: f64,
+        /// The end angle.
+        angle_end: f64,
+        /// The radius.
+        radius: f64,
+        /// The tag.
+        tag: String,
+    },
+    /// Angles and radius.
+    AnglesAndRadius {
+        /// The start angle.
+        angle_start: f64,
+        /// The end angle.
+        angle_end: f64,
+        /// The radius.
+        radius: f64,
+    },
+    /// Center, to and radius with a tag.
+    CenterToRadiusWithTag {
+        /// The center.
+        center: [f64; 2],
+        /// The to point.
+        to: [f64; 2],
+        /// The radius.
+        radius: f64,
+        /// The tag.
+        tag: String,
+    },
+    /// Center, to and radius.
+    CenterToRadius {
+        /// The center.
+        center: [f64; 2],
+        /// The to point.
+        to: [f64; 2],
+        /// The radius.
+        radius: f64,
+    },
+}
+
+/// Draw an arc.
+pub fn arc(args: &mut Args) -> Result<MemoryItem, KclError> {
+    let (data, sketch_group): (ArcData, SketchGroup) = args.get_data_and_sketch_group()?;
+
+    let new_sketch_group = inner_arc(data, sketch_group, args)?;
+    Ok(MemoryItem::SketchGroup(new_sketch_group))
+}
+
+/// Draw an arc.
+#[stdlib {
+    name = "arc",
+}]
+fn inner_arc(data: ArcData, sketch_group: SketchGroup, args: &mut Args) -> Result<SketchGroup, KclError> {
+    let from = sketch_group.get_coords_from_paths()?;
+
+    let (center, angle_start, angle_end, radius, end) = match &data {
+        ArcData::AnglesAndRadiusWithTag {
+            angle_start,
+            angle_end,
+            radius,
+            ..
+        } => {
+            let (center, end) = arc_center_and_end(&from, *angle_start, *angle_end, *radius);
+            (center, *angle_start, *angle_end, *radius, end)
+        }
+        ArcData::AnglesAndRadius {
+            angle_start,
+            angle_end,
+            radius,
+        } => {
+            let (center, end) = arc_center_and_end(&from, *angle_start, *angle_end, *radius);
+            (center, *angle_start, *angle_end, *radius, end)
+        }
+        ArcData::CenterToRadiusWithTag { center, to, radius, .. } => {
+            let (angle_start, angle_end) = arc_angles(&from, &center.into(), &to.into(), *radius, args.source_range)?;
+            (center.into(), angle_start, angle_end, *radius, to.into())
+        }
+        ArcData::CenterToRadius { center, to, radius } => {
+            let (angle_start, angle_end) = arc_angles(&from, &center.into(), &to.into(), *radius, args.source_range)?;
+            (center.into(), angle_start, angle_end, *radius, to.into())
+        }
+    };
+
+    let id = uuid::Uuid::new_v4();
+
+    args.send_modeling_cmd(
+        id,
+        ModelingCmd::ExtendPath {
+            path: sketch_group.id,
+            segment: kittycad::types::PathSegment::Arc {
+                angle_start,
+                angle_end,
+                center: center.into(),
+                radius,
+            },
+        },
+    )?;
+    // Move the path pen to the end of the arc.
+    // Since that is where we want to draw the next path.
+    // TODO: the engine should automatically move the pen to the end of the arc.
+    // This just seems inefficient.
+    args.send_modeling_cmd(
+        id,
+        ModelingCmd::MovePathPen {
+            path: sketch_group.id,
+            to: Point3D {
+                x: end.x,
+                y: end.y,
+                z: 0.0,
+            },
+        },
+    )?;
+
+    let current_path = Path::ToPoint {
+        base: BasePath {
+            from: from.into(),
+            to: end.into(),
+            name: match data {
+                ArcData::AnglesAndRadiusWithTag { tag, .. } => tag.to_string(),
+                ArcData::AnglesAndRadius { .. } => "".to_string(),
+                ArcData::CenterToRadiusWithTag { tag, .. } => tag.to_string(),
+                ArcData::CenterToRadius { .. } => "".to_string(),
+            },
+            geo_meta: GeoMeta {
+                id,
+                metadata: args.source_range.into(),
+            },
+        },
+    };
+
+    let mut new_sketch_group = sketch_group.clone();
+    new_sketch_group.value.push(current_path);
+
+    Ok(new_sketch_group)
+}
+
+/// Data to draw a bezier curve.
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
+#[ts(export)]
+#[serde(rename_all = "camelCase", untagged)]
+pub enum BezierData {
+    /// Points with a tag.
+    PointsWithTag {
+        /// The to point.
+        to: [f64; 2],
+        /// The first control point.
+        control1: [f64; 2],
+        /// The second control point.
+        control2: [f64; 2],
+        /// The tag.
+        tag: String,
+    },
+    /// Points.
+    Points {
+        /// The to point.
+        to: [f64; 2],
+        /// The first control point.
+        control1: [f64; 2],
+        /// The second control point.
+        control2: [f64; 2],
+    },
+}
+
+/// Draw a bezier curve.
+pub fn bezier_curve(args: &mut Args) -> Result<MemoryItem, KclError> {
+    let (data, sketch_group): (BezierData, SketchGroup) = args.get_data_and_sketch_group()?;
+
+    let new_sketch_group = inner_bezier_curve(data, sketch_group, args)?;
+    Ok(MemoryItem::SketchGroup(new_sketch_group))
+}
+
+/// Draw a bezier curve.
+#[stdlib {
+    name = "bezierCurve",
+}]
+fn inner_bezier_curve(data: BezierData, sketch_group: SketchGroup, args: &mut Args) -> Result<SketchGroup, KclError> {
+    let from = sketch_group.get_coords_from_paths()?;
+
+    let (to, control1, control2) = match &data {
+        BezierData::PointsWithTag {
+            to, control1, control2, ..
+        } => (to, control1, control2),
+        BezierData::Points { to, control1, control2 } => (to, control1, control2),
+    };
+
+    let to = [from.x + to[0], from.y + to[1]];
+
+    let id = uuid::Uuid::new_v4();
+
+    args.send_modeling_cmd(
+        id,
+        ModelingCmd::ExtendPath {
+            path: sketch_group.id,
+            segment: kittycad::types::PathSegment::Bezier {
+                control1: Point3D {
+                    x: from.x + control1[0],
+                    y: from.y + control1[1],
+                    z: 0.0,
+                },
+                control2: Point3D {
+                    x: from.x + control2[0],
+                    y: from.y + control2[1],
+                    z: 0.0,
+                },
+                end: Point3D {
+                    x: to[0],
+                    y: to[1],
+                    z: 0.0,
+                },
+            },
+        },
+    )?;
+
+    let current_path = Path::ToPoint {
+        base: BasePath {
+            from: from.into(),
+            to,
+            name: if let BezierData::PointsWithTag { tag, .. } = data {
+                tag.to_string()
+            } else {
+                "".to_string()
+            },
+            geo_meta: GeoMeta {
+                id,
+                metadata: args.source_range.into(),
+            },
+        },
+    };
+
+    let mut new_sketch_group = sketch_group.clone();
+    new_sketch_group.value.push(current_path);
+
+    Ok(new_sketch_group)
+}
+
 #[cfg(test)]
 mod tests {

--- a/src/wasm-lib/kcl/src/std/utils.rs
+++ b/src/wasm-lib/kcl/src/std/utils.rs
@ -1,3 +1,8 @@
+use crate::{
+    errors::{KclError, KclErrorDetails},
+    executor::{Point2d, SourceRange},
+};
+
 pub fn get_angle(a: &[f64; 2], b: &[f64; 2]) -> f64 {
    let x = b[0] - a[0];
    let y = b[1] - a[1];
@ -160,12 +165,80 @@ pub fn get_x_component(angle_degree: f64, y_component: f64) -> [f64; 2] {
    [sign * x_component, sign * y_component]
 }

+pub fn arc_center_and_end(from: &Point2d, start_angle_deg: f64, end_angle_deg: f64, radius: f64) -> (Point2d, Point2d) {
+    let start_angle = start_angle_deg * (std::f64::consts::PI / 180.0);
+    let end_angle = end_angle_deg * (std::f64::consts::PI / 180.0);
+
+    let center = Point2d {
+        x: -1.0 * (radius * start_angle.cos() - from.x),
+        y: -1.0 * (radius * start_angle.sin() - from.y),
+    };
+
+    let end = Point2d {
+        x: center.x + radius * end_angle.cos(),
+        y: center.y + radius * end_angle.sin(),
+    };
+
+    (center, end)
+}
+
+pub fn arc_angles(
+    from: &Point2d,
+    to: &Point2d,
+    center: &Point2d,
+    radius: f64,
+    source_range: SourceRange,
+) -> Result<(f64, f64), KclError> {
+    // First make sure that the points are on the circumference of the circle.
+    // If not, we'll return an error.
+    if !is_on_circumference(center, from, radius) {
+        return Err(KclError::Semantic(KclErrorDetails {
+            message: format!(
+                "Point {:?} is not on the circumference of the circle with center {:?} and radius {}.",
+                from, center, radius
+            ),
+            source_ranges: vec![source_range],
+        }));
+    }
+
+    if !is_on_circumference(center, to, radius) {
+        return Err(KclError::Semantic(KclErrorDetails {
+            message: format!(
+                "Point {:?} is not on the circumference of the circle with center {:?} and radius {}.",
+                to, center, radius
+            ),
+            source_ranges: vec![source_range],
+        }));
+    }
+
+    let start_angle = (from.y - center.y).atan2(from.x - center.x);
+    let end_angle = (to.y - center.y).atan2(to.x - center.x);
+
+    let start_angle_deg = start_angle * (180.0 / std::f64::consts::PI);
+    let end_angle_deg = end_angle * (180.0 / std::f64::consts::PI);
+
+    Ok((start_angle_deg, end_angle_deg))
+}
+
+pub fn is_on_circumference(center: &Point2d, point: &Point2d, radius: f64) -> bool {
+    let dx = point.x - center.x;
+    let dy = point.y - center.y;
+
+    let distance_squared = dx.powi(2) + dy.powi(2);
+
+    // We'll check if the distance squared is approximately equal to radius squared.
+    // Due to potential floating point inaccuracies, we'll check if the difference
+    // is very small (e.g., 1e-9) rather than checking for strict equality.
+    (distance_squared - radius.powi(2)).abs() < 1e-9
+}
+
 #[cfg(test)]
 mod tests {
    // Here you can bring your functions into scope
    use pretty_assertions::assert_eq;

    use super::{get_x_component, get_y_component};
+    use crate::executor::SourceRange;

    static EACH_QUAD: [(i32, [i32; 2]); 12] = [
        (-315, [1, 1]),
@ -241,4 +314,77 @@ mod tests {
        assert!((result[0] - 0.0).abs() < f64::EPSILON);
        assert_eq!(result[1] as i32, -1);
    }
+
+    #[test]
+    fn test_arc_center_and_end() {
+        let (center, end) = super::arc_center_and_end(&super::Point2d { x: 0.0, y: 0.0 }, 0.0, 90.0, 1.0);
+        assert_eq!(center.x.round(), -1.0);
+        assert_eq!(center.y, 0.0);
+        assert_eq!(end.x.round(), -1.0);
+        assert_eq!(end.y, 1.0);
+
+        let (center, end) = super::arc_center_and_end(&super::Point2d { x: 0.0, y: 0.0 }, 0.0, 180.0, 1.0);
+        assert_eq!(center.x.round(), -1.0);
+        assert_eq!(center.y, 0.0);
+        assert_eq!(end.x.round(), -2.0);
+        assert_eq!(end.y.round(), 0.0);
+
+        let (center, end) = super::arc_center_and_end(&super::Point2d { x: 0.0, y: 0.0 }, 0.0, 180.0, 10.0);
+        assert_eq!(center.x.round(), -10.0);
+        assert_eq!(center.y, 0.0);
+        assert_eq!(end.x.round(), -20.0);
+        assert_eq!(end.y.round(), 0.0);
+    }
+
+    #[test]
+    fn test_arc_angles() {
+        let (angle_start, angle_end) = super::arc_angles(
+            &super::Point2d { x: 0.0, y: 0.0 },
+            &super::Point2d { x: -1.0, y: 1.0 },
+            &super::Point2d { x: -1.0, y: 0.0 },
+            1.0,
+            SourceRange(Default::default()),
+        )
+        .unwrap();
+        assert_eq!(angle_start.round(), 0.0);
+        assert_eq!(angle_end.round(), 90.0);
+
+        let (angle_start, angle_end) = super::arc_angles(
+            &super::Point2d { x: 0.0, y: 0.0 },
+            &super::Point2d { x: -2.0, y: 0.0 },
+            &super::Point2d { x: -1.0, y: 0.0 },
+            1.0,
+            SourceRange(Default::default()),
+        )
+        .unwrap();
+        assert_eq!(angle_start.round(), 0.0);
+        assert_eq!(angle_end.round(), 180.0);
+
+        let (angle_start, angle_end) = super::arc_angles(
+            &super::Point2d { x: 0.0, y: 0.0 },
+            &super::Point2d { x: -20.0, y: 0.0 },
+            &super::Point2d { x: -10.0, y: 0.0 },
+            10.0,
+            SourceRange(Default::default()),
+        )
+        .unwrap();
+        assert_eq!(angle_start.round(), 0.0);
+        assert_eq!(angle_end.round(), 180.0);
+
+        let result = super::arc_angles(
+            &super::Point2d { x: 0.0, y: 5.0 },
+            &super::Point2d { x: 5.0, y: 5.0 },
+            &super::Point2d { x: 10.0, y: -10.0 },
+            10.0,
+            SourceRange(Default::default()),
+        );
+
+        if let Err(err) = result {
+            assert!(err.to_string().contains( "Point Point2d { x: 0.0, y: 5.0 } is not on the circumference of the circle with center Point2d { x: 10.0, y: -10.0 } and radius 10."));
+        } else {
+            panic!("Expected error");
+        }
+        assert_eq!(angle_start.round(), 0.0);
+        assert_eq!(angle_end.round(), 180.0);
+    }
 }
--- a/src/wasm-lib/kcl/src/tokeniser.rs
+++ b/src/wasm-lib/kcl/src/tokeniser.rs
@ -1,22 +1,110 @@
-use lazy_static::lazy_static;
-use regex::Regex;
-use serde::{Deserialize, Serialize};
+use std::str::FromStr;

-#[derive(Debug, PartialEq, Eq, Copy, Clone, Deserialize, Serialize, ts_rs::TS)]
+use anyhow::Result;
+use lazy_static::lazy_static;
+use parse_display::{Display, FromStr};
+use regex::Regex;
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+use tower_lsp::lsp_types::SemanticTokenType;
+
+/// The types of tokens.
+#[derive(Debug, PartialEq, Eq, Copy, Clone, Deserialize, Serialize, ts_rs::TS, JsonSchema, FromStr, Display)]
 #[ts(export)]
-#[serde(rename_all = "lowercase")]
+#[serde(rename_all = "camelCase")]
+#[display(style = "camelCase")]
 pub enum TokenType {
+    /// A number.
    Number,
+    /// A word.
    Word,
+    /// An operator.
    Operator,
+    /// A string.
    String,
+    /// A keyword.
+    Keyword,
+    /// A brace.
    Brace,
+    /// Whitespace.
    Whitespace,
+    /// A comma.
    Comma,
+    /// A colon.
    Colon,
+    /// A period.
    Period,
+    /// A line comment.
    LineComment,
+    /// A block comment.
    BlockComment,
+    /// A function name.
+    Function,
+}
+
+impl TryFrom<TokenType> for SemanticTokenType {
+    type Error = anyhow::Error;
+    fn try_from(token_type: TokenType) -> Result<Self> {
+        Ok(match token_type {
+            TokenType::Number => Self::NUMBER,
+            TokenType::Word => Self::VARIABLE,
+            TokenType::Keyword => Self::KEYWORD,
+            TokenType::Operator => Self::OPERATOR,
+            TokenType::String => Self::STRING,
+            TokenType::LineComment => Self::COMMENT,
+            TokenType::BlockComment => Self::COMMENT,
+            TokenType::Function => Self::FUNCTION,
+            TokenType::Whitespace | TokenType::Brace | TokenType::Comma | TokenType::Colon | TokenType::Period => {
+                anyhow::bail!("unsupported token type: {:?}", token_type)
+            }
+        })
+    }
+}
+
+impl TokenType {
+    // This is for the lsp server.
+    pub fn to_semantic_token_types() -> Result<Vec<SemanticTokenType>> {
+        let mut settings = schemars::gen::SchemaSettings::openapi3();
+        settings.inline_subschemas = true;
+        let mut generator = schemars::gen::SchemaGenerator::new(settings);
+
+        let schema = TokenType::json_schema(&mut generator);
+        let schemars::schema::Schema::Object(o) = &schema else {
+            anyhow::bail!("expected object schema: {:#?}", schema);
+        };
+        let Some(subschemas) = &o.subschemas else {
+            anyhow::bail!("expected subschemas: {:#?}", schema);
+        };
+        let Some(one_ofs) = &subschemas.one_of else {
+            anyhow::bail!("expected one_of: {:#?}", schema);
+        };
+
+        let mut semantic_tokens = vec![];
+        for one_of in one_ofs {
+            let schemars::schema::Schema::Object(o) = one_of else {
+                anyhow::bail!("expected object one_of: {:#?}", one_of);
+            };
+
+            let Some(enum_values) = o.enum_values.as_ref() else {
+                anyhow::bail!("expected enum values: {:#?}", o);
+            };
+
+            if enum_values.len() > 1 {
+                anyhow::bail!("expected only one enum value: {:#?}", o);
+            }
+
+            if enum_values.is_empty() {
+                anyhow::bail!("expected at least one enum value: {:#?}", o);
+            }
+
+            let label = TokenType::from_str(&enum_values[0].to_string().replace('"', ""))?;
+            if let Ok(semantic_token_type) = SemanticTokenType::try_from(label) {
+                semantic_tokens.push(semantic_token_type);
+            }
+        }
+
+        Ok(semantic_tokens)
+    }
 }

 #[derive(Debug, PartialEq, Eq, Deserialize, Serialize, Clone, ts_rs::TS)]
@ -45,8 +133,11 @@ lazy_static! {
    static ref NUMBER: Regex = Regex::new(r"^-?\d+(\.\d+)?").unwrap();
    static ref WHITESPACE: Regex = Regex::new(r"\s+").unwrap();
    static ref WORD: Regex = Regex::new(r"^[a-zA-Z_][a-zA-Z0-9_]*").unwrap();
-    static ref STRING: Regex = Regex::new(r#"^"([^"\\]|\\.)*"|'([^'\\]|\\.)*'"#).unwrap();
+    // TODO: these should be generated using our struct types for these.
+    static ref KEYWORD: Regex =
+        Regex::new(r"^(if|else|for|while|return|break|continue|fn|let|true|false|nil|and|or|not|var|const)\b").unwrap();
    static ref OPERATOR: Regex = Regex::new(r"^(>=|<=|==|=>|!= |\|>|\*|\+|-|/|%|=|<|>|\||\^)").unwrap();
+    static ref STRING: Regex = Regex::new(r#"^"([^"\\]|\\.)*"|'([^'\\]|\\.)*'"#).unwrap();
    static ref BLOCK_START: Regex = Regex::new(r"^\{").unwrap();
    static ref BLOCK_END: Regex = Regex::new(r"^\}").unwrap();
    static ref PARAN_START: Regex = Regex::new(r"^\(").unwrap();
@ -69,6 +160,9 @@ fn is_whitespace(character: &str) -> bool {
 fn is_word(character: &str) -> bool {
    WORD.is_match(character)
 }
+fn is_keyword(character: &str) -> bool {
+    KEYWORD.is_match(character)
+}
 fn is_string(character: &str) -> bool {
    match STRING.find(character) {
        Some(m) => m.start() == 0,
@ -112,8 +206,8 @@ fn is_block_comment(character: &str) -> bool {
    BLOCKCOMMENT.is_match(character)
 }

-fn match_first(str: &str, regex: &Regex) -> Option<String> {
-    regex.find(str).map(|the_match| the_match.as_str().to_string())
+fn match_first(s: &str, regex: &Regex) -> Option<String> {
+    regex.find(s).map(|the_match| the_match.as_str().to_string())
 }

 fn make_token(token_type: TokenType, value: &str, start: usize) -> Token {
@ -125,8 +219,8 @@ fn make_token(token_type: TokenType, value: &str, start: usize) -> Token {
    }
 }

-fn return_token_at_index(str: &str, start_index: usize) -> Option<Token> {
-    let str_from_index = &str[start_index..];
+fn return_token_at_index(s: &str, start_index: usize) -> Option<Token> {
+    let str_from_index = &s.chars().skip(start_index).collect::<String>();
    if is_string(str_from_index) {
        return Some(make_token(
            TokenType::String,
@ -216,6 +310,13 @@ fn return_token_at_index(str: &str, start_index: usize) -> Option<Token> {
            start_index,
        ));
    }
+    if is_keyword(str_from_index) {
+        return Some(make_token(
+            TokenType::Keyword,
+            &match_first(str_from_index, &KEYWORD)?,
+            start_index,
+        ));
+    }
    if is_word(str_from_index) {
        return Some(make_token(
            TokenType::Word,
@ -247,21 +348,22 @@ fn return_token_at_index(str: &str, start_index: usize) -> Option<Token> {
    None
 }

-pub fn lexer(str: &str) -> Vec<Token> {
-    fn recursively_tokenise(str: &str, current_index: usize, previous_tokens: Vec<Token>) -> Vec<Token> {
-        if current_index >= str.len() {
-            return previous_tokens;
-        }
-        let token = return_token_at_index(str, current_index);
-        let Some(token) = token else {
-            return recursively_tokenise(str, current_index + 1, previous_tokens);
-        };
-        let mut new_tokens = previous_tokens;
-        let token_length = token.value.len();
-        new_tokens.push(token);
-        recursively_tokenise(str, current_index + token_length, new_tokens)
+fn recursively_tokenise(s: &str, current_index: usize, previous_tokens: Vec<Token>) -> Vec<Token> {
+    if current_index >= s.len() {
+        return previous_tokens;
    }
-    recursively_tokenise(str, 0, Vec::new())
+    let token = return_token_at_index(s, current_index);
+    let Some(token) = token else {
+        return recursively_tokenise(s, current_index + 1, previous_tokens);
+    };
+    let mut new_tokens = previous_tokens;
+    let token_length = token.value.len();
+    new_tokens.push(token);
+    recursively_tokenise(s, current_index + token_length, new_tokens)
+}
+
+pub fn lexer(s: &str) -> Vec<Token> {
+    recursively_tokenise(s, 0, Vec::new())
 }

 #[cfg(test)]
@ -330,6 +432,7 @@ mod tests {
        assert!(!is_string(" \"a\""));
        assert!(!is_string("5\"a\""));
        assert!(!is_string("a + 'str'"));
+        assert!(is_string("'c'"));
    }

    #[test]
@ -453,14 +556,20 @@ mod tests {
        assert!(!is_block_comment("5 + 5"));
        assert!(!is_block_comment("5/* + 5"));
        assert!(!is_block_comment(" /* + 5"));
+        assert!(!is_block_comment(
+            r#"  /* and
+   here
+   */
+   "#
+        ));
    }

    #[test]
    fn make_token_test() {
        assert_eq!(
-            make_token(TokenType::Word, "const", 56),
+            make_token(TokenType::Keyword, "const", 56),
            Token {
-                token_type: TokenType::Word,
+                token_type: TokenType::Keyword,
                value: "const".to_string(),
                start: 56,
                end: 61,
@ -473,7 +582,7 @@ mod tests {
        assert_eq!(
            return_token_at_index("const", 0),
            Some(Token {
-                token_type: TokenType::Word,
+                token_type: TokenType::Keyword,
                value: "const".to_string(),
                start: 0,
                end: 5,
@ -496,7 +605,7 @@ mod tests {
            lexer("const a=5"),
            vec![
                Token {
-                    token_type: TokenType::Word,
+                    token_type: TokenType::Keyword,
                    value: "const".to_string(),
                    start: 0,
                    end: 5,
@ -587,4 +696,11 @@ mod tests {
            ]
        );
    }
+
+    // We have this as a test so we can ensure it never panics with an unwrap in the server.
+    #[test]
+    fn test_token_type_to_semantic_token_type() {
+        let semantic_types = TokenType::to_semantic_token_types().unwrap();
+        assert!(!semantic_types.is_empty());
+    }
 }
--- a/Show More
+++ b/Show More