chore: adding unit test to test getNodeFromPath failures (#5134)

* chore: adding unit test to test the parsing of the code

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* chore: trying to console error more content for getNodeByPath since it is cryptic

* fix: removing testing unit test

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* fix: fmt

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* bump

* fix: ...

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* bump

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* bump

* A snapshot a day keeps the bugs away! 📷🐛 (OS: namespace-profile-ubuntu-8-cores)

* bump

* fix: found da bug

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

e2e/playwright/point-click.spec.ts

@@ -1078,7 +1078,7 @@ sketch002 = startSketchOn('XZ')
     await page.waitForTimeout(500)
     await cmdBar.progressCmdBar()
     await expect(
-      page.getByText('Unable to sweep with the provided selection')
+      page.getByText('Unable to sweep with the current selection. Reason:')
     ).toBeVisible()
   })
 })
@@ -1846,7 +1846,7 @@ sweep001 = sweep({ path = sketch002 }, sketch001)
     await page.waitForTimeout(500)
     await cmdBar.progressCmdBar()
     await expect(
-      page.getByText('Unable to shell with the provided selection')
+      page.getByText('Unable to shell with the current selection. Reason:')
     ).toBeVisible()
     await page.waitForTimeout(1000)
   })

e2e/playwright/testing-samples-loading.spec.ts

@@ -69,7 +69,6 @@ test.describe('Testing in-app sample loading', () => {
       await confirmButton.click()
 
       await editor.expectEditor.toContain('// ' + newSample.title)
-      await expect(unitsToast('in')).toBeVisible()
     })
   })
 
@@ -158,7 +157,6 @@ test.describe('Testing in-app sample loading', () => {
         await editor.expectEditor.toContain('// ' + sampleOne.title)
         await expect(newlyCreatedFile(sampleOne.file)).toBeVisible()
         await expect(projectMenuButton).toContainText(sampleOne.file)
-        await expect(unitsToast('in')).toBeVisible()
       })
 
       await test.step(`Now overwrite the current file`, async () => {
@@ -188,7 +186,6 @@ test.describe('Testing in-app sample loading', () => {
         await expect(newlyCreatedFile(sampleOne.file)).toBeVisible()
         await expect(newlyCreatedFile(sampleTwo.file)).not.toBeVisible()
         await expect(projectMenuButton).toContainText(sampleOne.file)
-        await expect(unitsToast('mm')).toBeVisible()
       })
     }
   )

src/App.tsx

@@ -25,6 +25,7 @@ import { CameraProjectionToggle } from 'components/CameraProjectionToggle'
 import { useCreateFileLinkQuery } from 'hooks/useCreateFileLinkQueryWatcher'
 import { maybeWriteToDisk } from 'lib/telemetry'
 import { commandBarActor } from 'machines/commandBarMachine'
+import { useToken } from 'machines/appMachine'
 maybeWriteToDisk()
   .then(() => {})
   .catch(() => {})
@@ -60,8 +61,8 @@ export function App() {
 
   useHotKeyListener()
 
-  const { auth, settings } = useSettingsAuthContext()
+  const { settings } = useSettingsAuthContext()
-  const token = auth?.context?.token
+  const token = useToken()
 
   const coreDumpManager = useMemo(
     () => new CoreDumpManager(engineCommandManager, codeManager, token),

src/Auth.tsx

@@ -1,10 +1,10 @@
+import { useAuthState } from 'machines/appMachine'
 import Loading from './components/Loading'
-import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 
 // Wrapper around protected routes, used in src/Router.tsx
 export const Auth = ({ children }: React.PropsWithChildren) => {
-  const { auth } = useSettingsAuthContext()
+  const authState = useAuthState()
-  const isLoggingIn = auth?.state.matches('checkIfLoggedIn')
+  const isLoggingIn = authState.matches('checkIfLoggedIn')
 
   return isLoggingIn ? (
     <Loading>

src/Router.tsx

@@ -37,7 +37,6 @@ import { KclContextProvider } from 'lang/KclProvider'
 import { ASK_TO_OPEN_QUERY_PARAM, BROWSER_PROJECT_NAME } from 'lib/constants'
 import { CoreDumpManager } from 'lib/coredump'
 import { codeManager, engineCommandManager } from 'lib/singletons'
-import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import useHotkeyWrapper from 'lib/hotkeyWrapper'
 import toast from 'react-hot-toast'
 import { coreDump } from 'lang/wasm'
@@ -47,6 +46,7 @@ import { reportRejection } from 'lib/trap'
 import { RouteProvider } from 'components/RouteProvider'
 import { ProjectsContextProvider } from 'components/ProjectsContextProvider'
 import { OpenInDesktopAppHandler } from 'components/OpenInDesktopAppHandler'
+import { useToken } from 'machines/appMachine'
 
 const createRouter = isDesktop() ? createHashRouter : createBrowserRouter
 
@@ -203,8 +203,7 @@ export const Router = () => {
 }
 
 function CoreDump() {
-  const { auth } = useSettingsAuthContext()
+  const token = useToken()
-  const token = auth?.context?.token
   const coreDumpManager = useMemo(
     () => new CoreDumpManager(engineCommandManager, codeManager, token),
     []

src/components/AppHeader.tsx

@@ -2,11 +2,11 @@ import { Toolbar } from '../Toolbar'
 import UserSidebarMenu from 'components/UserSidebarMenu'
 import { type IndexLoaderData } from 'lib/types'
 import ProjectSidebarMenu from './ProjectSidebarMenu'
-import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import styles from './AppHeader.module.css'
 import { RefreshButton } from 'components/RefreshButton'
 import { CommandBarOpenButton } from './CommandBarOpenButton'
 import { isDesktop } from 'lib/isDesktop'
+import { useUser } from 'machines/appMachine'
 
 interface AppHeaderProps extends React.PropsWithChildren {
   showToolbar?: boolean
@@ -24,8 +24,7 @@ export const AppHeader = ({
   style,
   enableMenu = false,
 }: AppHeaderProps) => {
-  const { auth } = useSettingsAuthContext()
+  const user = useUser()
-  const user = auth?.context?.user
 
   return (
     <header

src/components/FileMachineProvider.tsx

@@ -30,6 +30,7 @@ import {
 import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import { markOnce } from 'lib/performance'
 import { commandBarActor } from 'machines/commandBarMachine'
+import { useToken } from 'machines/appMachine'
 
 type MachineContext<T extends AnyStateMachine> = {
   state: StateFrom<T>
@@ -47,7 +48,8 @@ export const FileMachineProvider = ({
   children: React.ReactNode
 }) => {
   const navigate = useNavigate()
-  const { settings, auth } = useSettingsAuthContext()
+  const { settings } = useSettingsAuthContext()
+  const token = useToken()
   const projectData = useRouteLoaderData(PATHS.FILE) as IndexLoaderData
   const { project, file } = projectData
   const [kclSamples, setKclSamples] = React.useState<KclSamplesManifestItem[]>(
@@ -297,7 +299,7 @@ export const FileMachineProvider = ({
   const kclCommandMemo = useMemo(
     () =>
       kclCommands({
-        authToken: auth?.context?.token ?? '',
+        authToken: token ?? '',
         projectData,
         settings: {
           defaultUnit: settings?.context?.modeling.defaultUnit.current ?? 'mm',

src/components/LspProvider.tsx

@@ -27,6 +27,7 @@ import { PROJECT_ENTRYPOINT } from 'lib/constants'
 import { err } from 'lib/trap'
 import { isDesktop } from 'lib/isDesktop'
 import { codeManager } from 'lib/singletons'
+import { useToken } from 'machines/appMachine'
 
 function getWorkspaceFolders(): LSP.WorkspaceFolder[] {
   return []
@@ -69,8 +70,7 @@ export const LspProvider = ({ children }: { children: React.ReactNode }) => {
   const [isKclLspReady, setIsKclLspReady] = useState(false)
   const [isCopilotLspReady, setIsCopilotLspReady] = useState(false)
 
-  const { auth } = useSettingsAuthContext()
+  const token = useToken()
-  const token = auth?.context.token
   const navigate = useNavigate()
 
   // So this is a bit weird, we need to initialize the lsp server and client.

src/components/ModelingMachineProvider.tsx

@@ -89,6 +89,7 @@ import { Node } from 'wasm-lib/kcl/bindings/Node'
 import { promptToEditFlow } from 'lib/promptToEdit'
 import { kclEditorActor } from 'machines/kclEditorMachine'
 import { commandBarActor } from 'machines/commandBarMachine'
+import { useToken } from 'machines/appMachine'
 
 type MachineContext<T extends AnyStateMachine> = {
   state: StateFrom<T>
@@ -110,7 +111,6 @@ export const ModelingMachineProvider = ({
   children: React.ReactNode
 }) => {
   const {
-    auth,
     settings: {
       context: {
         app: { theme, enableSSAO, allowOrbitInSketchMode },
@@ -127,7 +127,7 @@ export const ModelingMachineProvider = ({
   const navigate = useNavigate()
   const { context, send: fileMachineSend } = useFileContext()
   const { file } = useLoaderData() as IndexLoaderData
-  const token = auth?.context?.token
+  const token = useToken()
   const streamRef = useRef<HTMLDivElement>(null)
   const persistedContext = useMemo(() => getPersistedContext(), [])
 

src/components/ProjectSidebarMenu.tsx

@@ -20,6 +20,7 @@ import { useSelector } from '@xstate/react'
 import { copyFileShareLink } from 'lib/links'
 import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import { DEV } from 'env'
+import { useToken } from 'machines/appMachine'
 
 const ProjectSidebarMenu = ({
   project,
@@ -103,7 +104,8 @@ function ProjectMenuPopover({
   const location = useLocation()
   const navigate = useNavigate()
   const filePath = useAbsoluteFilePath()
-  const { settings, auth } = useSettingsAuthContext()
+  const { settings } = useSettingsAuthContext()
+  const token = useToken()
   const machineManager = useContext(MachineManagerContext)
   const commands = useSelector(commandBarActor, commandsSelector)
 
@@ -194,7 +196,7 @@ function ProjectMenuPopover({
           disabled: !DEV,
           onClick: async () => {
             await copyFileShareLink({
-              token: auth?.context.token || '',
+              token: token ?? '',
               code: codeManager.code,
               name: project?.name || '',
               units: settings.context.modeling.defaultUnit.current,

src/components/RefreshButton.tsx

@@ -8,10 +8,10 @@ import Tooltip from './Tooltip'
 import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import { reportRejection } from 'lib/trap'
 import { toSync } from 'lib/utils'
+import { useToken } from 'machines/appMachine'
 
 export const RefreshButton = ({ children }: React.PropsWithChildren) => {
-  const { auth } = useSettingsAuthContext()
+  const token = useToken()
-  const token = auth?.context?.token
   const coreDumpManager = useMemo(
     () => new CoreDumpManager(engineCommandManager, codeManager, token),
     []

src/components/RouteProvider.tsx

@@ -2,10 +2,12 @@ import { useEffect, useState, createContext, ReactNode } from 'react'
 import { useNavigation, useLocation } from 'react-router-dom'
 import { PATHS } from 'lib/paths'
 import { markOnce } from 'lib/performance'
+import { useAuthNavigation } from 'hooks/useAuthNavigation'
 
 export const RouteProviderContext = createContext({})
 
 export function RouteProvider({ children }: { children: ReactNode }) {
+  useAuthNavigation()
   const [first, setFirstState] = useState(true)
   const navigation = useNavigation()
   const location = useLocation()

src/components/SettingsAuthProvider.tsx

@@ -2,10 +2,7 @@ import { trap } from 'lib/trap'
 import { useMachine, useSelector } from '@xstate/react'
 import { useNavigate, useRouteLoaderData, useLocation } from 'react-router-dom'
 import { PATHS, BROWSER_PATH } from 'lib/paths'
-import { authMachine, TOKEN_PERSIST_KEY } from '../machines/authMachine'
-import withBaseUrl from '../lib/withBaseURL'
 import React, { createContext, useEffect, useState } from 'react'
-import useStateMachineCommands from '../hooks/useStateMachineCommands'
 import { settingsMachine } from 'machines/settingsMachine'
 import { toast } from 'react-hot-toast'
 import {
@@ -16,7 +13,6 @@ import {
 } from 'lib/theme'
 import decamelize from 'decamelize'
 import { Actor, AnyStateMachine, ContextFrom, Prop, StateFrom } from 'xstate'
-import { authCommandBarConfig } from 'lib/commandBarConfigs/authCommandConfig'
 import {
   kclManager,
   sceneInfra,
@@ -50,7 +46,6 @@ type MachineContext<T extends AnyStateMachine> = {
 }
 
 type SettingsAuthContextType = {
-  auth: MachineContext<typeof authMachine>
   settings: MachineContext<typeof settingsMachine>
 }
 
@@ -370,40 +365,9 @@ export const SettingsAuthProviderBase = ({
     )
   }, [settingsState.context.textEditor.blinkingCursor.current])
 
-  // Auth machine setup
-  const [authState, authSend, authActor] = useMachine(
-    authMachine.provide({
-      actions: {
-        goToSignInPage: () => {
-          navigate(PATHS.SIGN_IN)
-          // eslint-disable-next-line @typescript-eslint/no-floating-promises
-          logout()
-        },
-        goToIndexPage: () => {
-          if (location.pathname.includes(PATHS.SIGN_IN)) {
-            navigate(PATHS.INDEX)
-          }
-        },
-      },
-    })
-  )
-
-  useStateMachineCommands({
-    machineId: 'auth',
-    state: authState,
-    send: authSend,
-    commandBarConfig: authCommandBarConfig,
-    actor: authActor,
-  })
-
   return (
     <SettingsAuthContext.Provider
       value={{
-        auth: {
-          state: authState,
-          context: authState.context,
-          send: authSend,
-        },
         settings: {
           state: settingsState,
           context: settingsState.context,
@@ -417,12 +381,3 @@ export const SettingsAuthProviderBase = ({
 }
 
 export default SettingsAuthProvider
-
-export async function logout() {
-  localStorage.removeItem(TOKEN_PERSIST_KEY)
-  if (isDesktop()) return Promise.resolve(null)
-  return fetch(withBaseUrl('/logout'), {
-    method: 'POST',
-    credentials: 'include',
-  })
-}

src/components/UserSidebarMenu.tsx

@@ -4,12 +4,12 @@ import { useLocation, useNavigate } from 'react-router-dom'
 import { Fragment, useMemo, useState } from 'react'
 import { PATHS } from 'lib/paths'
 import { Models } from '@kittycad/lib'
-import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import { useAbsoluteFilePath } from 'hooks/useAbsoluteFilePath'
 import Tooltip from './Tooltip'
 import usePlatform from 'hooks/usePlatform'
 import { isDesktop } from 'lib/isDesktop'
 import { CustomIcon } from './CustomIcon'
+import { authActor } from 'machines/appMachine'
 
 type User = Models['User_type']
 
@@ -20,7 +20,7 @@ const UserSidebarMenu = ({ user }: { user?: User }) => {
   const displayedName = getDisplayName(user)
   const [imageLoadFailed, setImageLoadFailed] = useState(false)
   const navigate = useNavigate()
-  const send = useSettingsAuthContext()?.auth?.send
+  const send = authActor.send
 
   // We filter this memoized list so that no orphan "break" elements are rendered.
   const userMenuItems = useMemo<(ActionButtonProps | 'break')[]>(

src/hooks/useAuthNavigation.tsx

@@ -0,0 +1,29 @@
+import { PATHS } from 'lib/paths'
+import { useAuthState } from 'machines/appMachine'
+import { useEffect } from 'react'
+import { useLocation, useNavigate } from 'react-router-dom'
+
+/**
+ * A simple hook that listens to the auth state of the app and navigates
+ * accordingly.
+ */
+export function useAuthNavigation() {
+  const navigate = useNavigate()
+  const location = useLocation()
+  const authState = useAuthState()
+
+  // Subscribe to the auth state of the app and navigate accordingly.
+  useEffect(() => {
+    if (
+      authState.matches('loggedIn') &&
+      location.pathname.includes(PATHS.SIGN_IN)
+    ) {
+      navigate(PATHS.INDEX)
+    } else if (
+      authState.matches('loggedOut') &&
+      !location.pathname.includes(PATHS.SIGN_IN)
+    ) {
+      navigate(PATHS.SIGN_IN)
+    }
+  }, [authState])
+}

src/lang/queryAst.test.ts

@@ -5,7 +5,11 @@ import {
   PathToNode,
   Identifier,
   topLevelRange,
+  PipeExpression,
+  CallExpression,
+  VariableDeclarator,
 } from './wasm'
+import { ProgramMemory } from 'lang/wasm'
 import {
   findAllPreviousVariables,
   isNodeSafeToReplace,
@@ -25,9 +29,11 @@ import {
   createCallExpression,
   createLiteral,
   createPipeSubstitution,
+  createCallExpressionStdLib,
 } from './modifyAst'
 import { err } from 'lib/trap'
 import { codeRefFromRange } from './std/artifactGraph'
+import { addCallExpressionsToPipe, addCloseToPipe } from 'lang/std/sketch'
 
 beforeAll(async () => {
   await initPromise
@@ -680,3 +686,115 @@ myNestedVar = [
     expect(pathToNode).toEqual(pathToNode2)
   })
 })
+
+describe('Testing specific sketch getNodeFromPath workflow', () => {
+  it('should parse the code', () => {
+    const openSketch = `sketch001 = startSketchOn('XZ')
+|> startProfileAt([0.02, 0.22], %)
+|> xLine(0.39, %)
+|> line([0.02, -0.17], %)
+|> yLine(-0.15, %)
+|> line([-0.21, -0.02], %)
+|> xLine(-0.15, %)
+|> line([-0.02, 0.21], %)
+|> line([-0.08, 0.05], %)`
+    const ast = assertParse(openSketch)
+    expect(ast.start).toEqual(0)
+    expect(ast.end).toEqual(227)
+  })
+  it('should find the location to add new lineTo', () => {
+    const openSketch = `sketch001 = startSketchOn('XZ')
+|> startProfileAt([0.02, 0.22], %)
+|> xLine(0.39, %)
+|> line([0.02, -0.17], %)
+|> yLine(-0.15, %)
+|> line([-0.21, -0.02], %)
+|> xLine(-0.15, %)
+|> line([-0.02, 0.21], %)
+|> line([-0.08, 0.05], %)`
+    const ast = assertParse(openSketch)
+
+    const sketchSnippet = `startProfileAt([0.02, 0.22], %)`
+    const sketchRange = topLevelRange(
+      openSketch.indexOf(sketchSnippet),
+      openSketch.indexOf(sketchSnippet) + sketchSnippet.length
+    )
+    const sketchPathToNode = getNodePathFromSourceRange(ast, sketchRange)
+    const modifiedAst = addCallExpressionsToPipe({
+      node: ast,
+      programMemory: ProgramMemory.empty(),
+      pathToNode: sketchPathToNode,
+      expressions: [
+        createCallExpressionStdLib(
+          'lineTo', // We are forcing lineTo!
+          [
+            createArrayExpression([
+              createCallExpressionStdLib('profileStartX', [
+                createPipeSubstitution(),
+              ]),
+              createCallExpressionStdLib('profileStartY', [
+                createPipeSubstitution(),
+              ]),
+            ]),
+            createPipeSubstitution(),
+          ]
+        ),
+      ],
+    })
+    if (err(modifiedAst)) throw modifiedAst
+    const recasted = recast(modifiedAst)
+    const expectedCode = `sketch001 = startSketchOn('XZ')
+  |> startProfileAt([0.02, 0.22], %)
+  |> xLine(0.39, %)
+  |> line([0.02, -0.17], %)
+  |> yLine(-0.15, %)
+  |> line([-0.21, -0.02], %)
+  |> xLine(-0.15, %)
+  |> line([-0.02, 0.21], %)
+  |> line([-0.08, 0.05], %)
+  |> lineTo([profileStartX(%), profileStartY(%)], %)
+`
+    expect(recasted).toEqual(expectedCode)
+  })
+  it('it should find the location to add close', () => {
+    const openSketch = `sketch001 = startSketchOn('XZ')
+|> startProfileAt([0.02, 0.22], %)
+|> xLine(0.39, %)
+|> line([0.02, -0.17], %)
+|> yLine(-0.15, %)
+|> line([-0.21, -0.02], %)
+|> xLine(-0.15, %)
+|> line([-0.02, 0.21], %)
+|> line([-0.08, 0.05], %)
+|> lineTo([profileStartX(%), profileStartY(%)], %)
+`
+    const ast = assertParse(openSketch)
+    const sketchSnippet = `startProfileAt([0.02, 0.22], %)`
+    const sketchRange = topLevelRange(
+      openSketch.indexOf(sketchSnippet),
+      openSketch.indexOf(sketchSnippet) + sketchSnippet.length
+    )
+    const sketchPathToNode = getNodePathFromSourceRange(ast, sketchRange)
+    const modifiedAst = addCloseToPipe({
+      node: ast,
+      programMemory: ProgramMemory.empty(),
+      pathToNode: sketchPathToNode,
+    })
+
+    if (err(modifiedAst)) throw modifiedAst
+    const recasted = recast(modifiedAst)
+    const expectedCode = `sketch001 = startSketchOn('XZ')
+  |> startProfileAt([0.02, 0.22], %)
+  |> xLine(0.39, %)
+  |> line([0.02, -0.17], %)
+  |> yLine(-0.15, %)
+  |> line([-0.21, -0.02], %)
+  |> xLine(-0.15, %)
+  |> line([-0.02, 0.21], %)
+  |> line([-0.08, 0.05], %)
+  |> lineTo([profileStartX(%), profileStartY(%)], %)
+  |> close(%)
+`
+    expect(recasted).toEqual(expectedCode)
+  })
+})

src/lang/queryAst.ts

@@ -21,6 +21,7 @@ import {
   topLevelRange,
   VariableDeclaration,
   VariableDeclarator,
+  recast,
 } from './wasm'
 import { getNodePathFromSourceRange } from 'lang/queryAstNodePathUtils'
 import { createIdentifier, splitPathAtLastIndex } from './modifyAst'
@@ -68,7 +69,28 @@ export function getNodeFromPath<T>(
           deepPath: successfulPaths,
         }
       }
-      return new Error('not an object')
+      const stackTraceError = new Error()
+      const sourceCode = recast(node)
+      const levels = stackTraceError.stack?.split('\n')
+      const aFewFunctionNames: string[] = []
+      let tree = ''
+      levels?.forEach((val, index) => {
+        const fnName = val.trim().split(' ')[1]
+        const ending = index === levels.length - 1 ? ' ' : ' > '
+        tree += fnName + ending
+        if (index < 3) {
+          aFewFunctionNames.push(fnName)
+        }
+      })
+      const error = new Error(
+        `Failed to stopAt ${stopAt}, ${aFewFunctionNames
+          .filter((a) => a)
+          .join(' > ')}`
+      )
+      console.error(tree)
+      console.error(sourceCode)
+      console.error(error.stack)
+      return error
     }
     currentNode = currentNode?.[pathItem[0]]
     successfulPaths.push(pathItem)

src/lang/std/engineConnection.ts

@@ -1999,7 +1999,7 @@ export class EngineCommandManager extends EventTarget {
       .catch((e) => {
         // TODO: Previously was never caught, we are not rejecting these pendingCommands but this needs to be handled at some point.
         /*noop*/
-        return null
+        return e
       })
   }
   /**

src/lang/wasm.ts

@@ -18,6 +18,7 @@ import {
   default_project_settings,
   base64_decode,
   clear_scene_and_bust_cache,
+  change_kcl_settings,
   reloadModule,
 } from 'lib/wasm_lib_wrapper'
 
@@ -56,6 +57,7 @@ import { ArtifactGraph as RustArtifactGraph } from 'wasm-lib/kcl/bindings/Artifa
 import { Artifact } from './std/artifactGraph'
 import { getNodePathFromSourceRange } from 'lang/queryAstNodePathUtils'
 import { NumericSuffix } from 'wasm-lib/kcl/bindings/NumericSuffix'
+import { MetaSettings } from 'wasm-lib/kcl/bindings/MetaSettings'
 
 export type { Artifact } from 'wasm-lib/kcl/bindings/Artifact'
 export type { ArtifactCommand } from 'wasm-lib/kcl/bindings/Artifact'
@@ -844,3 +846,17 @@ export function base64Decode(base64: string): ArrayBuffer | Error {
     return new Error('Caught error decoding base64 string: ' + e)
   }
 }
+
+/// Change the meta settings for the kcl file.
+/// Returns the new kcl string with the updated settings.
+export function changeKclSettings(
+  kcl: string,
+  settings: MetaSettings
+): string | Error {
+  try {
+    return change_kcl_settings(kcl, JSON.stringify(settings))
+  } catch (e) {
+    console.error('Caught error changing kcl settings: ' + e)
+    return new Error('Caught error changing kcl settings: ' + e)
+  }
+}

src/lib/commandBarConfigs/authCommandConfig.ts

@@ -1,17 +1,14 @@
-import { StateMachineCommandSetConfig } from 'lib/commandTypes'
+import { Command } from 'lib/commandTypes'
-import { authMachine } from 'machines/authMachine'
+import { authActor } from 'machines/appMachine'
+import { ACTOR_IDS } from 'machines/machineConstants'
 
-type AuthCommandSchema = {}
+export const authCommands: Command[] = [
-
+  {
-export const authCommandBarConfig: StateMachineCommandSetConfig<
+    groupId: ACTOR_IDS.AUTH,
-  typeof authMachine,
+    name: 'log-out',
-  AuthCommandSchema
+    displayName: 'Log out',
-> = {
-  'Log in': {
-    hide: 'both',
-  },
-  'Log out': {
-    args: [],
     icon: 'arrowLeft',
+    needsReview: false,
+    onSubmit: () => authActor.send({ type: 'Log out' }),
   },
-}
+]

src/lib/commandBarConfigs/validators.test.ts

@@ -0,0 +1,19 @@
+import { parseEngineErrorMessage } from './validators'
+
+describe('parseEngineErrorMessage', () => {
+  it('takes an engine error string and parses its json message', () => {
+    const engineError =
+      'engine error: [{"error_code":"internal_engine","message":"Trajectory curve must be G1 continuous (with continuous tangents)"}]'
+    const message = parseEngineErrorMessage(engineError)
+    expect(message).toEqual(
+      'Trajectory curve must be G1 continuous (with continuous tangents)'
+    )
+  })
+
+  it('retuns undefined on strings with different formats', () => {
+    const s1 = 'engine error: []'
+    const s2 = 'blabla'
+    expect(parseEngineErrorMessage(s1)).toBeUndefined()
+    expect(parseEngineErrorMessage(s2)).toBeUndefined()
+  })
+})

src/lib/commandBarConfigs/validators.ts

@@ -3,6 +3,7 @@ import { engineCommandManager } from 'lib/singletons'
 import { uuidv4 } from 'lib/utils'
 import { CommandBarContext } from 'machines/commandBarMachine'
 import { Selections } from 'lib/selections'
+import { ApiError_type } from '@kittycad/lib/dist/types/src/models'
 
 export const disableDryRunWithRetry = async (numberOfRetries = 3) => {
   for (let tries = 0; tries < numberOfRetries; tries++) {
@@ -46,6 +47,20 @@ function isSelections(selections: unknown): selections is Selections {
   )
 }
 
+export function parseEngineErrorMessage(engineError: string) {
+  const parts = engineError.split('engine error: ')
+  if (parts.length < 2) {
+    return undefined
+  }
+
+  const errors = JSON.parse(parts[1]) as ApiError_type[]
+  if (!errors[0]) {
+    return undefined
+  }
+
+  return errors[0].message
+}
+
 export const revolveAxisValidator = async ({
   data,
   context,
@@ -83,7 +98,7 @@ export const revolveAxisValidator = async ({
     value: 360,
   }
 
-  const revolveAboutEdgeCommand = async () => {
+  const command = async () => {
     return await engineCommandManager.sendSceneCommand({
       type: 'modeling_cmd_req',
       cmd_id: uuidv4(),
@@ -96,13 +111,13 @@ export const revolveAxisValidator = async ({
       },
     })
   }
-  const attemptRevolve = await dryRunWrapper(revolveAboutEdgeCommand)
+  const result = await dryRunWrapper(command)
-  if (attemptRevolve?.success) {
+  if (result?.success) {
     return true
-  } else {
-    // return error message for the toast
-    return 'Unable to revolve with selected edge'
   }
+
+  const reason = parseEngineErrorMessage(result) || 'unknown'
+  return `Unable to revolve with the current selection. Reason: ${reason}`
 }
 
 export const loftValidator = async ({
@@ -128,7 +143,7 @@ export const loftValidator = async ({
     return 'Unable to loft, selection contains less than two solid2ds'
   }
 
-  const loftCommand = async () => {
+  const command = async () => {
     // TODO: check what to do with these
     const DEFAULT_V_DEGREE = 2
     const DEFAULT_TOLERANCE = 2
@@ -145,13 +160,13 @@ export const loftValidator = async ({
       },
     })
   }
-  const attempt = await dryRunWrapper(loftCommand)
+  const result = await dryRunWrapper(command)
-  if (attempt?.success) {
+  if (result?.success) {
     return true
-  } else {
-    // return error message for the toast
-    return 'Unable to loft with selected sketches'
   }
+
+  const reason = parseEngineErrorMessage(result) || 'unknown'
+  return `Unable to loft with the current selection. Reason: ${reason}`
 }
 
 export const shellValidator = async ({
@@ -180,7 +195,7 @@ export const shellValidator = async ({
     return "Unable to shell, couldn't find the solid"
   }
 
-  const shellCommand = async () => {
+  const command = async () => {
     // TODO: figure out something better than an arbitrarily small value
     const DEFAULT_THICKNESS: Models['LengthUnit_type'] = 1e-9
     const DEFAULT_HOLLOW = false
@@ -200,12 +215,13 @@ export const shellValidator = async ({
     })
   }
 
-  const attemptShell = await dryRunWrapper(shellCommand)
+  const result = await dryRunWrapper(command)
-  if (attemptShell?.success) {
+  if (result?.success) {
     return true
   }
 
-  return 'Unable to shell with the provided selection'
+  const reason = parseEngineErrorMessage(result) || 'unknown'
+  return `Unable to shell with the current selection. Reason: ${reason}`
 }
 
 export const sweepValidator = async ({
@@ -241,7 +257,7 @@ export const sweepValidator = async ({
   }
   const target = targetArtifact.pathId
 
-  const sweepCommand = async () => {
+  const command = async () => {
     // TODO: second look on defaults here
     const DEFAULT_TOLERANCE: Models['LengthUnit_type'] = 1e-7
     const DEFAULT_SECTIONAL = false
@@ -261,10 +277,11 @@ export const sweepValidator = async ({
     })
   }
 
-  const attemptSweep = await dryRunWrapper(sweepCommand)
+  const result = await dryRunWrapper(command)
-  if (attemptSweep?.success) {
+  if (result?.success) {
     return true
   }
 
-  return 'Unable to sweep with the provided selection'
+  const reason = parseEngineErrorMessage(result) || 'unknown'
+  return `Unable to sweep with the current selection. Reason: ${reason}`
 }

src/lib/kclCommands.ts

@@ -1,13 +1,10 @@
 import { CommandBarOverwriteWarning } from 'components/CommandBarOverwriteWarning'
 import { Command, CommandArgumentOption } from './commandTypes'
-import { codeManager, kclManager } from './singletons'
+import { kclManager } from './singletons'
 import { isDesktop } from './isDesktop'
-import { FILE_EXT, PROJECT_SETTINGS_FILE_NAME } from './constants'
+import { FILE_EXT } from './constants'
 import { UnitLength_type } from '@kittycad/lib/dist/types/src/models'
-import { parseProjectSettings } from 'lang/wasm'
+import { reportRejection } from './trap'
-import { err, reportRejection } from './trap'
-import { projectConfigurationToSettingsPayload } from './settings/settingsUtils'
-import { copyFileShareLink } from './links'
 import { IndexLoaderData } from './types'
 
 interface OnSubmitProps {
@@ -68,56 +65,23 @@ export function kclCommands(commandProps: KclCommandConfig): Command[] {
         const sampleCodeUrl = `https://raw.githubusercontent.com/KittyCAD/kcl-samples/main/${encodeURIComponent(
           projectPathPart
         )}/${encodeURIComponent(primaryKclFile)}`
-        const sampleSettingsFileUrl = `https://raw.githubusercontent.com/KittyCAD/kcl-samples/main/${encodeURIComponent(
-          projectPathPart
-        )}/${PROJECT_SETTINGS_FILE_NAME}`
 
-        Promise.allSettled([fetch(sampleCodeUrl), fetch(sampleSettingsFileUrl)])
+        fetch(sampleCodeUrl)
-          .then((results) => {
+          .then(async (codeResponse): Promise<OnSubmitProps> => {
-            const a =
+            if (!codeResponse.ok) {
-              'value' in results[0] ? results[0].value : results[0].reason
+              console.error(
-            const b =
+                'Failed to fetch sample code:',
-              'value' in results[1] ? results[1].value : results[1].reason
+                codeResponse.statusText
-            return [a, b]
+              )
-          })
+              return Promise.reject(new Error('Failed to fetch sample code'))
-          .then(
-            async ([
-              codeResponse,
-              settingsResponse,
-            ]): Promise<OnSubmitProps> => {
-              if (!codeResponse.ok) {
-                console.error(
-                  'Failed to fetch sample code:',
-                  codeResponse.statusText
-                )
-                return Promise.reject(new Error('Failed to fetch sample code'))
-              }
-              const code = await codeResponse.text()
-
-              // It's possible that a sample doesn't have a project.toml
-              // associated with it.
-              let projectSettingsPayload: ReturnType<
-                typeof projectConfigurationToSettingsPayload
-              > = {}
-              if (settingsResponse.ok) {
-                const parsedProjectSettings = parseProjectSettings(
-                  await settingsResponse.text()
-                )
-                if (!err(parsedProjectSettings)) {
-                  projectSettingsPayload =
-                    projectConfigurationToSettingsPayload(parsedProjectSettings)
-                }
-              }
-
-              return {
-                sampleName: data.sample.split('/')[0] + FILE_EXT,
-                code,
-                method: data.method,
-                sampleUnits:
-                  projectSettingsPayload.modeling?.defaultUnit || 'mm',
-              }
             }
-          )
+            const code = await codeResponse.text()
+            return {
+              sampleName: data.sample.split('/')[0] + FILE_EXT,
+              code,
+              method: data.method,
+            }
+          })
           .then((props) => {
             if (props?.code) {
               commandProps.specialPropsForSampleCommand

src/lib/wasm_lib_wrapper.ts

@@ -26,6 +26,7 @@ import {
   default_project_settings as DefaultProjectSettings,
   base64_decode as Base64Decode,
   clear_scene_and_bust_cache as ClearSceneAndBustCache,
+  change_kcl_settings as ChangeKclSettings,
 } from '../wasm-lib/pkg/wasm_lib'
 
 type ModuleType = typeof import('../wasm-lib/pkg/wasm_lib')
@@ -110,3 +111,6 @@ export const clear_scene_and_bust_cache: typeof ClearSceneAndBustCache = (
 ) => {
   return getModule().clear_scene_and_bust_cache(...args)
 }
+export const change_kcl_settings: typeof ChangeKclSettings = (...args) => {
+  return getModule().change_kcl_settings(...args)
+}

src/machines/appMachine.ts

@@ -0,0 +1,30 @@
+import { ActorRefFrom, createActor, setup } from 'xstate'
+import { authMachine } from './authMachine'
+import { useSelector } from '@xstate/react'
+import { ACTOR_IDS } from './machineConstants'
+
+const appMachine = setup({
+  actors: {
+    [ACTOR_IDS.AUTH]: authMachine,
+  },
+}).createMachine({
+  /** @xstate-layout N4IgpgJg5mDOIC5gF8A0IB2B7CdGgAoBbAQwGMALASwzAEp8QAHLWKgFyqw0YA9EAjACZ0AT0FDkU5EA */
+  id: 'modeling-app',
+  invoke: [
+    {
+      src: ACTOR_IDS.AUTH,
+      systemId: ACTOR_IDS.AUTH,
+    },
+  ],
+})
+
+export const appActor = createActor(appMachine).start()
+
+export const authActor = appActor.system.get(ACTOR_IDS.AUTH) as ActorRefFrom<
+  typeof authMachine
+>
+export const useAuthState = () => useSelector(authActor, (state) => state)
+export const useToken = () =>
+  useSelector(authActor, (state) => state.context.token)
+export const useUser = () =>
+  useSelector(authActor, (state) => state.context.user)

src/machines/authMachine.ts

@@ -15,6 +15,8 @@ import {
 } from 'lib/desktop'
 import { COOKIE_NAME } from 'lib/constants'
 import { markOnce } from 'lib/performance'
+import { ACTOR_IDS } from './machineConstants'
+import withBaseUrl from '../lib/withBaseURL'
 
 const SKIP_AUTH = VITE_KC_SKIP_AUTH === 'true' && DEV
 
@@ -50,7 +52,7 @@ export type Events =
     }
 
 export const TOKEN_PERSIST_KEY = 'TOKEN_PERSIST_KEY'
-const persistedToken =
+export const persistedToken =
   VITE_KC_DEV_TOKEN ||
   getCookie(COOKIE_NAME) ||
   localStorage?.getItem(TOKEN_PERSIST_KEY) ||
@@ -69,18 +71,17 @@ export const authMachine = setup({
           }
         }
   },
-  actions: {
-    goToIndexPage: () => {},
-    goToSignInPage: () => {},
-  },
   actors: {
     getUser: fromPromise(({ input }: { input: { token?: string } }) =>
       getUser(input)
     ),
+    logout: fromPromise(async () =>
+      isDesktop() ? writeTokenFile('') : logout()
+    ),
   },
 }).createMachine({
-  /** @xstate-layout N4IgpgJg5mDOIC5QEECuAXAFgOgMabFwGsBJAMwBkB7KGCEgOwGIIqGxsBLBgNyqI75CRALQAbGnRHcA2gAYAuolAAHKrE7pObZSAAeiAIwAWQ9gBspuQCYAnAGYAHPYCsx+4ccAaEAE9E1q7YcoZyxrYR1m7mcrYAvnE+aFh4BMTk1LSQjExgAE55VHnYKmIAhuhkRQC2qcLikpDSDPJKSCBqGlo67QYI9gDs5tge5o6h5vau7oY+-v3mA9jWco4u5iu21ua2YcYJSRg4Eln0zJkABFQYrbqdmtoMun2GA7YjxuPmLqvGNh5zRCfJaOcyLUzuAYuFyGcwHEDJY6NCAAeQwTEuskUd3UDx6oD6Im2wUcAzkMJ2cjBxlMgIWLmwZLWljecjJTjh8IYVAgcF0iJxXUez0QIgGxhJZIpu2ptL8AWwtje1nCW2iq1shns8MRdXSlGRjEFeKevUQjkcy3sqwGHimbg83nlCF22GMytVUWMMUc8USCKO2BOdCN7Xu3VNBKMKsVFp2hm2vu+1id83slkVrgTxhcW0pNJ1geDkDR6GNEZFCAT1kZZLk9cMLltb0WdPMjewjjC1mzOZCtk5CSAA */
+  /** @xstate-layout N4IgpgJg5mDOIC5QAoC2BDAxgCwJYDswBKAOhzEwGsBJAMwBkB7KGCa-AYgkcJIIDdGlMGWwVKAWgA2zVhIIBtAAwBdRKAAOjWLgAuuHupAAPRAGYArAEYSADgu2AnGYBMLpVYBsZz7YA0IACeiG6OJM62tmZKLgDsno5KtvEAvikBaFh4hKTkVHRMLJDsHGAATmWMZSQaUui6tFWoouLSspDy+MpqSCBaOvqGvaYIljb2Tq7uXj7+QYgALFYW4clWy1ZmVgsWsZtpGRg4BMQkMkVsnIUABIwArrrdRv16BvhGI74LJBYW7o5WKJmKILObBUZeEgJP4LTxKMwIhZmBYLA4gTLHHJnWQEKAAeQeXB4IgEQhEGOyp3OUFxBN0CFJmHqb26T16L0G72GiCsSg8PyszkBCViTiUjgC4Jcnhc4SUsQcvgsoL2VjRFJOpGptMJ5Uq1Vq9UaZWaGqx2vw+IeDPwgiZnNZqme2leQ1An1s31+-0BCJBYJCLm+lk8CRl9hRyos6qOlK17QgdI4N0UTvZLs5Hx58NsJARuys0tDSl+AYQthsgNi0TMqt2LjVaPwjAgcCMZuIzoGbyzCAknkliH7Maympa+QYCfYXddXPdixcg4QvKUdk2u2iLkcsXhCRHmKpU7nfQzPe5CAsMpIXi8MvFKM8VliS5c1jzj53W3isNFqPS6NjMcLStXQZ0zc8ohsJI-kcFxXEcR9HAWF9gTzDxbCUXxAQWEsdn3ONsQuOkwLPedl22MIzFg3YP1gl9PG+bYvGsSxlUcRJozSFIgA */
-  id: 'Auth',
+  id: ACTOR_IDS.AUTH,
   initial: 'checkIfLoggedIn',
   context: {
     token: persistedToken,
@@ -112,19 +113,30 @@ export const authMachine = setup({
       },
     },
     loggedIn: {
-      entry: ['goToIndexPage'],
       on: {
         'Log out': {
-          target: 'loggedOut',
+          target: 'loggingOut',
-          actions: () => {
+        },
-            // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      },
-            if (isDesktop()) writeTokenFile('')
+    },
-          },
+    loggingOut: {
+      invoke: {
+        src: 'logout',
+        onDone: 'loggedOut',
+        onError: {
+          target: 'loggedIn',
+          actions: [
+            ({ event }) => {
+              console.error(
+                'Error while logging out',
+                'error' in event ? `: ${event.error}` : ''
+              )
+            },
+          ],
         },
       },
     },
     loggedOut: {
-      entry: ['goToSignInPage'],
       on: {
         'Log in': {
           target: 'checkIfLoggedIn',
@@ -235,3 +247,12 @@ async function getAndSyncStoredToken(input: {
   localStorage.setItem(TOKEN_PERSIST_KEY, fileToken)
   return fileToken
 }
+
+async function logout() {
+  localStorage.removeItem(TOKEN_PERSIST_KEY)
+  if (isDesktop()) return Promise.resolve(null)
+  return fetch(withBaseUrl('/logout'), {
+    method: 'POST',
+    credentials: 'include',
+  })
+}

src/machines/commandBarMachine.ts

@@ -10,6 +10,7 @@ import { getCommandArgumentKclValuesOnly } from 'lib/commandUtils'
 import { MachineManager } from 'components/MachineManagerProvider'
 import toast from 'react-hot-toast'
 import { useSelector } from '@xstate/react'
+import { authCommands } from 'lib/commandBarConfigs/authCommandConfig'
 
 export type CommandBarContext = {
   commands: Command[]
@@ -80,6 +81,7 @@ export type CommandBarMachineEvent =
 export const commandBarMachine = setup({
   types: {
     context: {} as CommandBarContext,
+    input: {} as { commands: Command[] },
     events: {} as CommandBarMachineEvent,
   },
   actions: {
@@ -409,8 +411,8 @@ export const commandBarMachine = setup({
   },
 }).createMachine({
   /** @xstate-layout N4IgpgJg5mDOIC5QGED2BbdBDAdhABAEJYBOAxMgDaqxgDaADALqKgAONAlgC6eo6sQAD0QBaAIwB2AHTiAHAE45AZjkAmdcoaSArCoA0IAJ6JxDOdJ2SF4gCySHaqZIa2Avm8NpMuAsXJUYKSMLEggHLA8fAJhIgiiOgBssokKTpJqiXK2OsqJaoYm8eJqytKJ9hqq+eJW2h5eGNh4RKRkAGKcLb74tJRgAMbc+ANNviGCEVH8gnEKubK5ympVrrlyhabm0rZ5CtYM4hVq83ININ7NfqTSVDSQZADybGA4E2FTvDOxiGoMDNJMjo9H9lLYGDpKpsEModOJpA5XOIwakwcidOdLj1-LdqLQIGQAIIQAijHx4WDvdhcL4xUBxURqSTw3LzfYKZSSOQZWzQ5S1crMuTAiElRKuTFjFo4u74sgAJTA6FQADcwCMpRBKcxJjTorMxEzkhouftuXCGGpIdCpADmZJxfzJLY5Cp5pLydcSLj7gSqeE9d96Yh+TppKoXfkGKdlHloUyFIDUvMXBzbFl3J4LprWt6AMpgfpDLpQDWesgFovDMlXf2ffU-BBZZKuczWWylRRwvlM6Q2LIMZQ2QdHZQeq65245vqDbgPOuBunCEP88MqPQchwVNLKaHptTSYUuRI6f4npyJcfYm5Ylozobz8ShamRWkGhBmeTSQeJX+JXQ6H88jQnCMiugoELCpypQKJeWa3l6U6er0hazvOajPgGr4NsGH6WhYsHOkycglLCEJ7iclgaIosKSLGGgKFe0o3AA4lg3AABZgCQJb4KQUAAK7oK83CwBQHG4DAIwCSQJAiXxJCCcJODcAu2FBsuH55GGJ7irYHYqHpGzGKYWiWB2nK2Kcv6wWO8E5jibGcdxvH8UJIliQAInAqFDGWtY6h8i7vlkZREbYZg6JuwEmQgfxhnkHbiHYJ7yHYTGIU5XE8TgpZucponSISADuWBRLl+BdGwAncBWAkAEboDwClKSJanTEucS1Bk36DicDCpOYLoKHu-x9tGuhgoozKpBlk5ZS5FX5R50gAGpYJQnAQOxJZkBA-BgNIXQqqgADWh0qhtW3sWAeYlv0hKKe5KntW+YRFGi5RyOKDrZEaUW8pppTguGuwDRFEO-nNjnsdlrlPQVsBrVd228LlZDcSQqDemwlDsQAZtj6DSJdm2o7d91gI9rUvYFL4dYIH0RV9P0Zv9CiA3EwMAmCWgVHYKVwY0yE4oqKqcGAxV1Y1zU1uMdNYQzjbMpYcgQlFxFq66u6xXRALbkyg7-Bz0bQzcYsS1LxIEMttOYfWGldYcCWwQmNiRrU0Jq2GRxJCbHZqC6ahm96FuSwqSqquqtuqQrDudVs4iJhUyZtn9qjQokYKHjk6hSLsZhciH0hh1LACiEDNTHr04ZpJT6bIEXxcKp50YDRT-mGrrJbUgFDp3xfIFxAynbx1PPaJe0HUdOAnedJMozd4+IzXjuIJCLIQqUWjJS4MVFBByS7BzyJq38WTB-ZIs3sPo8VcvHlTzgh3HWdF2L3OD8qZST66upCdxUTLBJOUUHB6GFPpSQXt1CWEGpaOiv4EyD1vmPBGj9MbY2kLjAmRMF5kyXmg7+q8AFJwbjkXQEVsj5FyO3RAiQjjfi5CReYPck7iA8FmHAqAIBwEEAhXMf8la4VEMsWwgJuTTXNGYK0tC4rwkDvsAaSQ-qlAhIPPEkBBFvWEVycoFQhywUHGaHWH04Q7FUNBdc+x2FXwnDiSss5eJyzwFo2ucQIplBWHrcEVhuoFFirCeEuxsj8mWEOFYmZhZ2JvNOXyc4ICuLXggaxCJwG70AiUHQfIzHBKHGYDMJFhTFwWjlPKhDRKJJIRFGQcIFBsiOIHJw8ZIQ7CUGrY+9g9AnmKbDRaZSaaFRKmVNGpYqo1Uqe+FKYZan1PyElbJYjrB6C5CUJQ9DL5ROvN6Ep8MBlI3WvgkZEzGzyAbnkZK-wjan38UzeEzZtBswdADYupdjm4XoTIOwuwHB5HyGkYyRRdBBLosCIE6ZvpnFsVs24KD77lPgEFf+kzxRH32EyFYlpOzQjAZYV2ehTkfI4W4IAA */
-  context: {
+  context: ({ input }) => ({
-    commands: [],
+    commands: input.commands || [],
     selectedCommand: undefined,
     currentArgument: undefined,
     selectionRanges: {
@@ -425,7 +427,7 @@ export const commandBarMachine = setup({
       setCurrentMachine: () => {},
       noMachinesReason: () => undefined,
     },
-  },
+  }),
   id: 'Command Bar',
   initial: 'Closed',
   states: {
@@ -631,7 +633,11 @@ function sortCommands(a: Command, b: Command) {
   return a.name.localeCompare(b.name)
 }
 
-export const commandBarActor = createActor(commandBarMachine).start()
+export const commandBarActor = createActor(commandBarMachine, {
+  input: {
+    commands: [...authCommands],
+  },
+}).start()
 
 /** Basic state snapshot selector */
 const cmdBarStateSelector = (state: SnapshotFrom<typeof commandBarActor>) =>

src/machines/machineConstants.ts

@@ -0,0 +1,3 @@
+export const ACTOR_IDS = {
+  AUTH: 'auth',
+}

src/machines/modelingMachine.ts

@@ -583,6 +583,13 @@ export const modelingMachine = setup({
   },
   // end guards
   actions: {
+    toastError: ({ event }) => {
+      if ('output' in event && event.output instanceof Error) {
+        toast.error(event.output.message)
+      } else if ('data' in event && event.data instanceof Error) {
+        toast.error(event.data.message)
+      }
+    },
     'assign tool in context': assign({
       currentTool: ({ event }) =>
         'data' in event && event.data && 'tool' in event.data
@@ -637,56 +644,6 @@ export const modelingMachine = setup({
         sketchDetails: event.output,
       }
     }),
-    'AST extrude': ({ context: { store }, event }) => {
-      if (event.type !== 'Extrude') return
-      ;(async () => {
-        if (!event.data) return
-        const { selection, distance } = event.data
-        let ast = kclManager.ast
-        if (
-          'variableName' in distance &&
-          distance.variableName &&
-          distance.insertIndex !== undefined
-        ) {
-          const newBody = [...ast.body]
-          newBody.splice(
-            distance.insertIndex,
-            0,
-            distance.variableDeclarationAst
-          )
-          ast.body = newBody
-        }
-        const pathToNode = getNodePathFromSourceRange(
-          ast,
-          selection.graphSelections[0]?.codeRef.range
-        )
-        const extrudeSketchRes = extrudeSketch(
-          ast,
-          pathToNode,
-          false,
-          'variableName' in distance
-            ? distance.variableIdentifierAst
-            : distance.valueAst
-        )
-        if (trap(extrudeSketchRes)) return
-        const { modifiedAst, pathToExtrudeArg } = extrudeSketchRes
-
-        const updatedAst = await kclManager.updateAst(modifiedAst, true, {
-          focusPath: [pathToExtrudeArg],
-          zoomToFit: true,
-          zoomOnRangeAndType: {
-            range: selection.graphSelections[0]?.codeRef.range,
-            type: 'path',
-          },
-        })
-
-        await codeManager.updateEditorWithAstAndWriteToFile(updatedAst.newAst)
-
-        if (updatedAst?.selections) {
-          editorManager.selectRange(updatedAst?.selections)
-        }
-      })().catch(reportRejection)
-    },
     'AST revolve': ({ context: { store }, event }) => {
       if (event.type !== 'Revolve') return
       ;(async () => {
@@ -1491,6 +1448,63 @@ export const modelingMachine = setup({
         return {} as SetSelections
       }
     ),
+    extrudeAstMod: fromPromise<
+      void,
+      ModelingCommandSchema['Extrude'] | undefined
+    >(async ({ input }) => {
+      if (!input) return Promise.reject('No input provided')
+      const { selection, distance } = input
+      let ast = structuredClone(kclManager.ast)
+      let extrudeName: string | undefined = undefined
+
+      const pathToNode = getNodePathFromSourceRange(
+        ast,
+        selection.graphSelections[0]?.codeRef.range
+      )
+      // Add an extrude statement to the AST
+      const extrudeSketchRes = extrudeSketch(
+        ast,
+        pathToNode,
+        false,
+        'variableName' in distance
+          ? distance.variableIdentifierAst
+          : distance.valueAst
+      )
+      if (err(extrudeSketchRes)) return Promise.reject(extrudeSketchRes)
+      const { modifiedAst, pathToExtrudeArg } = extrudeSketchRes
+
+      // Insert the distance variable if the user has provided a variable name
+      if (
+        'variableName' in distance &&
+        distance.variableName &&
+        typeof pathToExtrudeArg[1][0] === 'number'
+      ) {
+        const insertIndex = Math.min(
+          pathToExtrudeArg[1][0],
+          distance.insertIndex
+        )
+        const newBody = [...modifiedAst.body]
+        newBody.splice(insertIndex, 0, distance.variableDeclarationAst)
+        modifiedAst.body = newBody
+        // Since we inserted a new variable, we need to update the path to the extrude argument
+        pathToExtrudeArg[1][0]++
+      }
+
+      const updatedAst = await kclManager.updateAst(modifiedAst, true, {
+        focusPath: [pathToExtrudeArg],
+        zoomToFit: true,
+        zoomOnRangeAndType: {
+          range: selection.graphSelections[0]?.codeRef.range,
+          type: 'path',
+        },
+      })
+
+      await codeManager.updateEditorWithAstAndWriteToFile(updatedAst.newAst)
+
+      if (updatedAst?.selections) {
+        editorManager.selectRange(updatedAst?.selections)
+      }
+    }),
     offsetPlaneAstMod: fromPromise(
       async ({
         input,
@@ -1821,9 +1835,8 @@ export const modelingMachine = setup({
         ],
 
         Extrude: {
-          target: 'idle',
+          target: 'Applying extrude',
-          actions: ['AST extrude'],
+          reenter: true,
-          reenter: false,
         },
 
         Revolve: {
@@ -2548,7 +2561,7 @@ export const modelingMachine = setup({
 
         'Delete segment': {
           reenter: false,
-          actions: ['Delete segment', 'Set sketchDetails'],
+          actions: ['Delete segment', 'Set sketchDetails', 'reset selections'],
         },
         'code edit during sketch': '.clean slate',
       },
@@ -2620,6 +2633,22 @@ export const modelingMachine = setup({
       },
     },
 
+    'Applying extrude': {
+      invoke: {
+        src: 'extrudeAstMod',
+        id: 'extrudeAstMod',
+        input: ({ event }) => {
+          if (event.type !== 'Extrude') return undefined
+          return event.data
+        },
+        onDone: ['idle'],
+        onError: {
+          target: 'idle',
+          actions: 'toastError',
+        },
+      },
+    },
+
     'Applying offset plane': {
       invoke: {
         src: 'offsetPlaneAstMod',

src/routes/Onboarding/UserMenu.tsx

@@ -1,15 +1,14 @@
 import { OnboardingButtons, useDismiss, useNextClick } from '.'
 import { onboardingPaths } from 'routes/Onboarding/paths'
 import { useEffect, useState } from 'react'
-import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
+import { useUser } from 'machines/appMachine'
 
 export default function UserMenu() {
-  const { auth } = useSettingsAuthContext()
+  const user = useUser()
   const dismiss = useDismiss()
   const next = useNextClick(onboardingPaths.PROJECT_MENU)
   const [avatarErrored, setAvatarErrored] = useState(false)
 
-  const user = auth?.context?.user
   const errorOrNoImage = !user?.image || avatarErrored
   const buttonDescription = errorOrNoImage ? 'the menu button' : 'your avatar'
 

src/routes/SignIn.tsx

@@ -14,6 +14,7 @@ import { openExternalBrowserIfDesktop } from 'lib/openWindow'
 import { toSync } from 'lib/utils'
 import { reportRejection } from 'lib/trap'
 import toast from 'react-hot-toast'
+import { authActor } from 'machines/appMachine'
 
 const subtleBorder =
   'border border-solid border-chalkboard-30 dark:border-chalkboard-80'
@@ -22,7 +23,6 @@ const cardArea = `${subtleBorder} rounded-lg px-6 py-3 text-chalkboard-70 dark:t
 const SignIn = () => {
   const [userCode, setUserCode] = useState('')
   const {
-    auth: { send },
     settings: {
       state: {
         context: {
@@ -70,7 +70,7 @@ const SignIn = () => {
       toast.error('Error while trying to log in')
       return
     }
-    send({ type: 'Log in', token })
+    authActor.send({ type: 'Log in', token })
   }
 
   return (

src/wasm-lib/Cargo.lock

@@ -1710,7 +1710,7 @@ dependencies = [
 
 [[package]]
 name = "kcl-lib"
-version = "0.2.32"
+version = "0.2.33"
 dependencies = [
  "anyhow",
  "approx 0.5.1",

src/wasm-lib/kcl/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "kcl-lib"
 description = "KittyCAD Language implementation and tools"
-version = "0.2.32"
+version = "0.2.33"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/KittyCAD/modeling-app"

src/wasm-lib/kcl/src/docs/mod.rs

@@ -13,9 +13,7 @@ use tower_lsp::lsp_types::{
     MarkupKind, ParameterInformation, ParameterLabel, SignatureHelp, SignatureInformation,
 };
 
-use crate::execution::Sketch;
+use crate::{execution::Sketch, std::Primitive};
-
-use crate::std::Primitive;
 
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, ts_rs::TS)]
 #[ts(export)]

src/wasm-lib/kcl/src/execution/annotations.rs

@@ -7,9 +7,9 @@ use crate::{
     KclError, SourceRange,
 };
 
-pub(super) const SETTINGS: &str = "settings";
+pub(crate) const SETTINGS: &str = "settings";
-pub(super) const SETTINGS_UNIT_LENGTH: &str = "defaultLengthUnit";
+pub(crate) const SETTINGS_UNIT_LENGTH: &str = "defaultLengthUnit";
-pub(super) const SETTINGS_UNIT_ANGLE: &str = "defaultAngleUnit";
+pub(crate) const SETTINGS_UNIT_ANGLE: &str = "defaultAngleUnit";
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub(super) enum AnnotationScope {

src/wasm-lib/kcl/src/execution/exec_ast.rs

@@ -2,6 +2,7 @@ use std::collections::HashMap;
 
 use async_recursion::async_recursion;
 
+use super::cad_op::{OpArg, Operation};
 use crate::{
     errors::{KclError, KclErrorDetails},
     execution::{
@@ -19,8 +20,6 @@ use crate::{
     },
 };
 
-use super::cad_op::{OpArg, Operation};
-
 impl BinaryPart {
     #[async_recursion]
     pub async fn get_result(&self, exec_state: &mut ExecState, ctx: &ExecutorContext) -> Result<KclValue, KclError> {

src/wasm-lib/kcl/src/execution/import.rs

@@ -15,6 +15,7 @@ use kittycad_modeling_cmds as kcmc;
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
+use super::ExecutorContext;
 use crate::{
     errors::{KclError, KclErrorDetails},
     execution::{ExecState, ImportedGeometry},
@@ -22,8 +23,6 @@ use crate::{
     source_range::SourceRange,
 };
 
-use super::ExecutorContext;
-
 // Zoo co-ordinate system.
 //
 // * Forward: -Y

src/wasm-lib/kcl/src/execution/kcl_value.rs

@@ -581,10 +581,11 @@ impl KclValue {
 }
 
 // TODO called UnitLen so as not to clash with UnitLength in settings)
-#[derive(Debug, Clone, Copy, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema, Eq)]
+#[derive(Debug, Default, Clone, Copy, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema, Eq)]
 #[ts(export)]
 #[serde(tag = "type")]
 pub enum UnitLen {
+    #[default]
     Mm,
     Cm,
     M,
@@ -593,6 +594,19 @@ pub enum UnitLen {
     Yards,
 }
 
+impl std::fmt::Display for UnitLen {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            UnitLen::Mm => write!(f, "mm"),
+            UnitLen::Cm => write!(f, "cm"),
+            UnitLen::M => write!(f, "m"),
+            UnitLen::Inches => write!(f, "in"),
+            UnitLen::Feet => write!(f, "ft"),
+            UnitLen::Yards => write!(f, "yd"),
+        }
+    }
+}
+
 impl TryFrom<NumericSuffix> for UnitLen {
     type Error = ();
 
@@ -644,6 +658,15 @@ pub enum UnitAngle {
     Radians,
 }
 
+impl std::fmt::Display for UnitAngle {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            UnitAngle::Degrees => write!(f, "deg"),
+            UnitAngle::Radians => write!(f, "rad"),
+        }
+    }
+}
+
 impl TryFrom<NumericSuffix> for UnitAngle {
     type Error = ();
 

src/wasm-lib/kcl/src/execution/mod.rs

@@ -13,8 +13,7 @@ use kcmc::{
     websocket::{ModelingSessionData, OkWebSocketResponseData},
     ImageFormat, ModelingCmd,
 };
-use kittycad_modeling_cmds::length_unit::LengthUnit;
+use kittycad_modeling_cmds::{self as kcmc, length_unit::LengthUnit, websocket::WebSocketResponse};
-use kittycad_modeling_cmds::{self as kcmc, websocket::WebSocketResponse};
 use parse_display::{Display, FromStr};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
@@ -27,14 +26,18 @@ pub(crate) use import::{import_foreign, send_to_engine as send_import_to_engine,
 pub use kcl_value::{KclObjectFields, KclValue, UnitAngle, UnitLen};
 use uuid::Uuid;
 
-mod annotations;
+pub(crate) mod annotations;
 mod artifact;
 pub(crate) mod cache;
 mod cad_op;
 mod exec_ast;
 mod function_param;
 mod import;
-mod kcl_value;
+pub(crate) mod kcl_value;
+
+// Re-exports.
+pub use artifact::{Artifact, ArtifactCommand, ArtifactGraph, ArtifactId};
+pub use cad_op::Operation;
 
 use crate::{
     engine::{EngineManager, ExecutionKind},
@@ -52,10 +55,6 @@ use crate::{
     ExecError, KclErrorWithOutputs, Program,
 };
 
-// Re-exports.
-pub use artifact::{Artifact, ArtifactCommand, ArtifactGraph, ArtifactId};
-pub use cad_op::Operation;
-
 /// State for executing a program.
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
@@ -247,7 +246,7 @@ impl ModuleState {
     }
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
+#[derive(Debug, Default, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
 #[ts(export)]
 #[serde(rename_all = "camelCase")]
 pub struct MetaSettings {
@@ -256,7 +255,11 @@ pub struct MetaSettings {
 }
 
 impl MetaSettings {
-    fn update_from_annotation(&mut self, annotation: &NonCodeValue, source_range: SourceRange) -> Result<(), KclError> {
+    pub fn update_from_annotation(
+        &mut self,
+        annotation: &NonCodeValue,
+        source_range: SourceRange,
+    ) -> Result<(), KclError> {
         let properties = annotations::expect_properties(annotations::SETTINGS, annotation, source_range)?;
 
         for p in properties {

src/wasm-lib/kcl/src/lib.rs

@@ -84,7 +84,7 @@ pub use engine::{EngineManager, ExecutionKind};
 pub use errors::{CompilationError, ConnectionError, ExecError, KclError, KclErrorWithOutputs};
 pub use execution::{
     cache::{CacheInformation, OldAstState},
-    ExecState, ExecutorContext, ExecutorSettings, Point2d,
+    ExecState, ExecutorContext, ExecutorSettings, MetaSettings, Point2d,
 };
 pub use lsp::{
     copilot::Backend as CopilotLspBackend,
@@ -121,8 +121,7 @@ pub mod std_utils {
 }
 
 pub mod pretty {
-    pub use crate::parsing::token::NumericSuffix;
+    pub use crate::{parsing::token::NumericSuffix, unparser::format_number};
-    pub use crate::unparser::format_number;
 }
 
 use serde::{Deserialize, Serialize};
@@ -162,6 +161,18 @@ impl Program {
         self.ast.compute_digest()
     }
 
+    /// Get the meta settings for the kcl file from the annotations.
+    pub fn get_meta_settings(&self) -> Result<Option<crate::MetaSettings>, KclError> {
+        self.ast.get_meta_settings()
+    }
+
+    /// Change the meta settings for the kcl file.
+    pub fn change_meta_settings(&mut self, settings: crate::MetaSettings) -> Result<Self, KclError> {
+        Ok(Self {
+            ast: self.ast.change_meta_settings(settings)?,
+        })
+    }
+
     pub fn lint_all(&self) -> Result<Vec<lint::Discovered>, anyhow::Error> {
         self.ast.lint_all()
     }

src/wasm-lib/kcl/src/parsing/ast/modify.rs

@@ -6,6 +6,7 @@ use kcmc::{
 };
 use kittycad_modeling_cmds as kcmc;
 
+use super::types::LiteralValue;
 use crate::{
     engine::EngineManager,
     errors::{KclError, KclErrorDetails},
@@ -18,8 +19,6 @@ use crate::{
     Program,
 };
 
-use super::types::LiteralValue;
-
 type Point3d = kcmc::shared::Point3d<f64>;
 
 #[derive(Debug)]

src/wasm-lib/kcl/src/parsing/ast/types/mod.rs

@@ -17,7 +17,6 @@ use tower_lsp::lsp_types::{
     CompletionItem, CompletionItemKind, DocumentSymbol, FoldingRange, FoldingRangeKind, Range as LspRange, SymbolKind,
 };
 
-use super::digest::Digest;
 pub use crate::parsing::ast::types::{
     condition::{ElseIf, IfExpression},
     literal_value::LiteralValue,
@@ -26,7 +25,8 @@ pub use crate::parsing::ast::types::{
 use crate::{
     docs::StdLibFn,
     errors::KclError,
-    execution::{KclValue, Metadata, TagIdentifier},
+    execution::{annotations, KclValue, Metadata, TagIdentifier},
+    parsing::ast::digest::Digest,
     parsing::PIPE_OPERATOR,
     source_range::{ModuleId, SourceRange},
 };
@@ -254,6 +254,52 @@ impl Node<Program> {
         }
         Ok(findings)
     }
+
+    /// Get the annotations for the meta settings from the kcl file.
+    pub fn get_meta_settings(&self) -> Result<Option<crate::execution::MetaSettings>, KclError> {
+        let annotations = self
+            .non_code_meta
+            .start_nodes
+            .iter()
+            .filter_map(|n| n.annotation().map(|result| (result, n.as_source_range())));
+        for (annotation, source_range) in annotations {
+            if annotation.annotation_name() == Some(annotations::SETTINGS) {
+                let mut meta_settings = crate::execution::MetaSettings::default();
+                meta_settings.update_from_annotation(annotation, source_range)?;
+                return Ok(Some(meta_settings));
+            }
+        }
+
+        Ok(None)
+    }
+
+    pub fn change_meta_settings(&mut self, settings: crate::execution::MetaSettings) -> Result<Self, KclError> {
+        let mut new_program = self.clone();
+        let mut found = false;
+        for node in &mut new_program.non_code_meta.start_nodes {
+            if let Some(annotation) = node.annotation() {
+                if annotation.annotation_name() == Some(annotations::SETTINGS) {
+                    let annotation = NonCodeValue::new_from_meta_settings(&settings);
+                    *node = Node::no_src(NonCodeNode {
+                        value: annotation,
+                        digest: None,
+                    });
+                    found = true;
+                    break;
+                }
+            }
+        }
+
+        if !found {
+            let annotation = NonCodeValue::new_from_meta_settings(&settings);
+            new_program.non_code_meta.start_nodes.push(Node::no_src(NonCodeNode {
+                value: annotation,
+                digest: None,
+            }));
+        }
+
+        Ok(new_program)
+    }
 }
 
 impl Program {
@@ -1078,6 +1124,24 @@ impl NonCodeValue {
             _ => None,
         }
     }
+
+    pub fn new_from_meta_settings(settings: &crate::execution::MetaSettings) -> NonCodeValue {
+        let mut properties: Vec<Node<ObjectProperty>> = vec![ObjectProperty::new(
+            Identifier::new(annotations::SETTINGS_UNIT_LENGTH),
+            Expr::Identifier(Box::new(Identifier::new(&settings.default_length_units.to_string()))),
+        )];
+
+        if settings.default_angle_units != Default::default() {
+            properties.push(ObjectProperty::new(
+                Identifier::new(annotations::SETTINGS_UNIT_ANGLE),
+                Expr::Identifier(Box::new(Identifier::new(&settings.default_angle_units.to_string()))),
+            ));
+        }
+        NonCodeValue::Annotation {
+            name: Identifier::new(annotations::SETTINGS),
+            properties: Some(properties),
+        }
+    }
 }
 
 #[derive(Debug, Default, Clone, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
@@ -2337,6 +2401,14 @@ impl Node<ObjectProperty> {
 }
 
 impl ObjectProperty {
+    pub fn new(key: Node<Identifier>, value: Expr) -> Node<Self> {
+        Node::no_src(Self {
+            key,
+            value,
+            digest: None,
+        })
+    }
+
     /// Returns a hover value that includes the given character position.
     pub fn get_hover_value_for_position(&self, pos: usize, code: &str) -> Option<Hover> {
         let value_source_range: SourceRange = self.value.clone().into();
@@ -3756,4 +3828,98 @@ const cylinder = startSketchOn('-XZ')
 
         assert_eq!(l.raw, "false");
     }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn test_parse_get_meta_settings_inch() {
+        let some_program_string = r#"@settings(defaultLengthUnit = inch)
+
+startSketchOn('XY')"#;
+        let program = crate::parsing::top_level_parse(some_program_string).unwrap();
+        let result = program.get_meta_settings().unwrap();
+        assert!(result.is_some());
+        let meta_settings = result.unwrap();
+
+        assert_eq!(
+            meta_settings.default_length_units,
+            crate::execution::kcl_value::UnitLen::Inches
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn test_parse_get_meta_settings_inch_to_mm() {
+        let some_program_string = r#"@settings(defaultLengthUnit = inch)
+
+startSketchOn('XY')"#;
+        let mut program = crate::parsing::top_level_parse(some_program_string).unwrap();
+        let result = program.get_meta_settings().unwrap();
+        assert!(result.is_some());
+        let meta_settings = result.unwrap();
+
+        assert_eq!(
+            meta_settings.default_length_units,
+            crate::execution::kcl_value::UnitLen::Inches
+        );
+
+        // Edit the ast.
+        let new_program = program
+            .change_meta_settings(crate::execution::MetaSettings {
+                default_length_units: crate::execution::kcl_value::UnitLen::Mm,
+                ..Default::default()
+            })
+            .unwrap();
+
+        let result = new_program.get_meta_settings().unwrap();
+        assert!(result.is_some());
+        let meta_settings = result.unwrap();
+
+        assert_eq!(
+            meta_settings.default_length_units,
+            crate::execution::kcl_value::UnitLen::Mm
+        );
+
+        let formatted = new_program.recast(&Default::default(), 0);
+
+        assert_eq!(
+            formatted,
+            r#"@settings(defaultLengthUnit = mm)
+
+
+startSketchOn('XY')
+"#
+        );
+    }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn test_parse_get_meta_settings_nothing_to_mm() {
+        let some_program_string = r#"startSketchOn('XY')"#;
+        let mut program = crate::parsing::top_level_parse(some_program_string).unwrap();
+        let result = program.get_meta_settings().unwrap();
+        assert!(result.is_none());
+
+        // Edit the ast.
+        let new_program = program
+            .change_meta_settings(crate::execution::MetaSettings {
+                default_length_units: crate::execution::kcl_value::UnitLen::Mm,
+                ..Default::default()
+            })
+            .unwrap();
+
+        let result = new_program.get_meta_settings().unwrap();
+        assert!(result.is_some());
+        let meta_settings = result.unwrap();
+
+        assert_eq!(
+            meta_settings.default_length_units,
+            crate::execution::kcl_value::UnitLen::Mm
+        );
+
+        let formatted = new_program.recast(&Default::default(), 0);
+
+        assert_eq!(
+            formatted,
+            r#"@settings(defaultLengthUnit = mm)
+startSketchOn('XY')
+"#
+        );
+    }
 }

src/wasm-lib/kcl/src/std/math.rs

@@ -3,14 +3,13 @@
 use anyhow::Result;
 use derive_docs::stdlib;
 
+use super::args::FromArgs;
 use crate::{
     errors::{KclError, KclErrorDetails},
     execution::{ExecState, KclValue},
     std::Args,
 };
 
-use super::args::FromArgs;
-
 /// Compute the remainder after dividing `num` by `div`.
 /// If `num` is negative, the result will be too.
 pub async fn rem(_exec_state: &mut ExecState, args: Args) -> Result<KclValue, KclError> {

src/wasm-lib/kcl/src/std/sketch.rs

@@ -11,12 +11,11 @@ use parse_display::{Display, FromStr};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
-use crate::execution::{Artifact, ArtifactId};
 use crate::{
     errors::{KclError, KclErrorDetails},
     execution::{
-        BasePath, ExecState, Face, GeoMeta, KclValue, Path, Plane, Point2d, Point3d, Sketch, SketchSet, SketchSurface,
+        Artifact, ArtifactId, BasePath, ExecState, Face, GeoMeta, KclValue, Path, Plane, Point2d, Point3d, Sketch,
-        Solid, TagEngineInfo, TagIdentifier,
+        SketchSet, SketchSurface, Solid, TagEngineInfo, TagIdentifier,
     },
     parsing::ast::types::TagNode,
     std::{
@@ -2250,7 +2249,10 @@ mod tests {
 
     use pretty_assertions::assert_eq;
 
-    use crate::{execution::TagIdentifier, std::sketch::PlaneData, std::utils::calculate_circle_center};
+    use crate::{
+        execution::TagIdentifier,
+        std::{sketch::PlaneData, utils::calculate_circle_center},
+    };
 
     #[test]
     fn test_deserialize_plane_data() {

src/wasm-lib/src/wasm.rs

@@ -614,3 +614,18 @@ pub fn calculate_circle_from_3_points(ax: f64, ay: f64, bx: f64, by: f64, cx: f6
         radius: result.radius,
     }
 }
+
+/// Takes a kcl string and Meta settings and changes the meta settings in the kcl string.
+#[wasm_bindgen]
+pub fn change_kcl_settings(code: &str, settings_str: &str) -> Result<String, String> {
+    console_error_panic_hook::set_once();
+
+    let settings: kcl_lib::MetaSettings = serde_json::from_str(settings_str).map_err(|e| e.to_string())?;
+    let mut program = Program::parse_no_errs(code).map_err(|e| e.to_string())?;
+
+    let new_program = program.change_meta_settings(settings).map_err(|e| e.to_string())?;
+
+    let formatted = new_program.recast();
+
+    Ok(formatted)
+}