Clippy, shut up man.

* add workflow

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

---------

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

.github/workflows/check-exampleKcl.yml

@@ -0,0 +1,36 @@
+name: Check Onboarding KCL
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    paths:
+      - 'src/lib/exampleKcl.ts'
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Comment on PR
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const message = '`src/lib/exampleKcl.ts` has been updated in this PR, please review and update the `src/routes/onboarding`, if needed.';
+            const issue_number = context.payload.pull_request.number;
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+
+            // Post a comment on the PR
+            await github.rest.issues.createComment({
+              owner,
+              repo,
+              issue_number,
+              body: message,
+            });

src/wasm-lib/grackle/src/binding_scope.rs

@@ -2,13 +2,16 @@ use std::collections::HashMap;
 
 use kcl_lib::ast::types::{LiteralIdentifier, LiteralValue};
 
+use kittycad_execution_plan::constants;
+use kittycad_execution_plan_traits::Primitive;
+
 use super::{native_functions, Address};
 use crate::{CompileError, KclFunction};
 
 /// KCL values which can be written to KCEP memory.
 /// This is recursive. For example, the bound value might be an array, which itself contains bound values.
 #[derive(Debug, Clone)]
-#[cfg_attr(test, derive(Eq, PartialEq))]
+#[cfg_attr(test, derive(PartialEq))]
 pub enum EpBinding {
     /// A KCL value which gets stored in a particular address in KCEP memory.
     Single(Address),
@@ -23,6 +26,8 @@ pub enum EpBinding {
         properties: HashMap<String, EpBinding>,
     },
     /// Not associated with a KCEP address.
+    Constant(Primitive),
+    /// Not associated with a KCEP address.
     Function(KclFunction),
     /// SketchGroups have their own storage.
     SketchGroup { index: usize },
@@ -52,11 +57,13 @@ impl EpBinding {
                     EpBinding::SketchGroup { .. } => Err(CompileError::CannotIndex),
                     EpBinding::Single(_) => Err(CompileError::CannotIndex),
                     EpBinding::Function(_) => Err(CompileError::CannotIndex),
+                    EpBinding::Constant(_) => Err(CompileError::CannotIndex),
                 },
                 // Objects can be indexed by string properties.
                 LiteralValue::String(property) => match self {
                     EpBinding::Single(_) => Err(CompileError::NoProperties),
                     EpBinding::Function(_) => Err(CompileError::NoProperties),
+                    EpBinding::Constant(_) => Err(CompileError::CannotIndex),
                     EpBinding::SketchGroup { .. } => Err(CompileError::NoProperties),
                     EpBinding::Sequence { .. } => Err(CompileError::ArrayDoesNotHaveProperties),
                     EpBinding::Map {
@@ -103,8 +110,58 @@ impl BindingScope {
             // TODO: Actually put the stdlib prelude in here,
             // things like `startSketchAt` and `line`.
             ep_bindings: HashMap::from([
+                ("E".into(), EpBinding::Constant(constants::E)),
+                ("PI".into(), EpBinding::Constant(constants::PI)),
                 ("id".into(), EpBinding::from(KclFunction::Id(native_functions::Id))),
+                ("abs".into(), EpBinding::from(KclFunction::Abs(native_functions::Abs))),
+                (
+                    "acos".into(),
+                    EpBinding::from(KclFunction::Acos(native_functions::Acos)),
+                ),
+                (
+                    "asin".into(),
+                    EpBinding::from(KclFunction::Asin(native_functions::Asin)),
+                ),
+                (
+                    "atan".into(),
+                    EpBinding::from(KclFunction::Atan(native_functions::Atan)),
+                ),
+                (
+                    "ceil".into(),
+                    EpBinding::from(KclFunction::Ceil(native_functions::Ceil)),
+                ),
+                ("cos".into(), EpBinding::from(KclFunction::Cos(native_functions::Cos))),
+                (
+                    "floor".into(),
+                    EpBinding::from(KclFunction::Floor(native_functions::Floor)),
+                ),
+                ("ln".into(), EpBinding::from(KclFunction::Ln(native_functions::Ln))),
+                (
+                    "log10".into(),
+                    EpBinding::from(KclFunction::Log10(native_functions::Log10)),
+                ),
+                (
+                    "log2".into(),
+                    EpBinding::from(KclFunction::Log2(native_functions::Log2)),
+                ),
+                ("sin".into(), EpBinding::from(KclFunction::Sin(native_functions::Sin))),
+                (
+                    "sqrt".into(),
+                    EpBinding::from(KclFunction::Sqrt(native_functions::Sqrt)),
+                ),
+                ("tan".into(), EpBinding::from(KclFunction::Tan(native_functions::Tan))),
+                (
+                    "toDegrees".into(),
+                    EpBinding::from(KclFunction::ToDegrees(native_functions::ToDegrees)),
+                ),
+                (
+                    "toRadians".into(),
+                    EpBinding::from(KclFunction::ToRadians(native_functions::ToRadians)),
+                ),
                 ("add".into(), EpBinding::from(KclFunction::Add(native_functions::Add))),
+                ("log".into(), EpBinding::from(KclFunction::Log(native_functions::Log))),
+                ("max".into(), EpBinding::from(KclFunction::Max(native_functions::Max))),
+                ("min".into(), EpBinding::from(KclFunction::Min(native_functions::Min))),
                 (
                     "startSketchAt".into(),
                     EpBinding::from(KclFunction::StartSketchAt(native_functions::sketch::StartSketchAt)),

src/wasm-lib/grackle/src/lib.rs

@@ -259,6 +259,24 @@ impl Planner {
                     binding,
                 } = match callee {
                     KclFunction::Id(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Abs(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Acos(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Asin(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Atan(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Ceil(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Cos(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Floor(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Ln(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Log10(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Log2(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Sin(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Sqrt(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Tan(f) => f.call(&mut ctx, args)?,
+                    KclFunction::ToDegrees(f) => f.call(&mut ctx, args)?,
+                    KclFunction::ToRadians(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Log(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Max(f) => f.call(&mut ctx, args)?,
+                    KclFunction::Min(f) => f.call(&mut ctx, args)?,
                     KclFunction::StartSketchAt(f) => f.call(&mut ctx, args)?,
                     KclFunction::Extrude(f) => f.call(&mut ctx, args)?,
                     KclFunction::LineTo(f) => f.call(&mut ctx, args)?,
@@ -634,6 +652,21 @@ impl Eq for UserDefinedFunction {}
 #[cfg_attr(test, derive(Eq, PartialEq))]
 enum KclFunction {
     Id(native_functions::Id),
+    Abs(native_functions::Abs),
+    Acos(native_functions::Acos),
+    Asin(native_functions::Asin),
+    Atan(native_functions::Atan),
+    Ceil(native_functions::Ceil),
+    Cos(native_functions::Cos),
+    Floor(native_functions::Floor),
+    Ln(native_functions::Ln),
+    Log10(native_functions::Log10),
+    Log2(native_functions::Log2),
+    Sin(native_functions::Sin),
+    Sqrt(native_functions::Sqrt),
+    Tan(native_functions::Tan),
+    ToDegrees(native_functions::ToDegrees),
+    ToRadians(native_functions::ToRadians),
     StartSketchAt(native_functions::sketch::StartSketchAt),
     LineTo(native_functions::sketch::LineTo),
     Line(native_functions::sketch::Line),
@@ -642,6 +675,9 @@ enum KclFunction {
     YLineTo(native_functions::sketch::YLineTo),
     YLine(native_functions::sketch::YLine),
     Add(native_functions::Add),
+    Log(native_functions::Log),
+    Max(native_functions::Max),
+    Min(native_functions::Min),
     UserDefined(UserDefinedFunction),
     Extrude(native_functions::sketch::Extrude),
     Close(native_functions::sketch::Close),

src/wasm-lib/grackle/src/native_functions.rs

@@ -2,18 +2,15 @@
 //! This includes some of the stdlib, e.g. `startSketchAt`.
 //! But some other stdlib functions will be written in KCL.
 
-use kittycad_execution_plan::{BinaryArithmetic, Destination, Instruction};
+use kittycad_execution_plan::{
+    BinaryArithmetic, BinaryOperation, Destination, Instruction, Operand, UnaryArithmetic, UnaryOperation,
+};
 use kittycad_execution_plan_traits::Address;
 
 use crate::{CompileError, EpBinding, EvalPlan};
 
 pub mod sketch;
 
-/// The identity function. Always returns its first input.
-#[derive(Debug, Clone)]
-#[cfg_attr(test, derive(Eq, PartialEq))]
-pub struct Id;
-
 pub trait Callable {
     fn call(&self, ctx: &mut Context<'_>, args: Vec<EpBinding>) -> Result<EvalPlan, CompileError>;
 }
@@ -32,6 +29,65 @@ impl<'a> Context<'a> {
     }
 }
 
+/// Unary operator macro to quickly create new bindings.
+macro_rules! define_unary {
+  () => {};
+  ($h:ident$( $r:ident)*) => {
+    #[derive(Debug, Clone)]
+    #[cfg_attr(test, derive(Eq, PartialEq))]
+    pub struct $h;
+
+    impl Callable for $h {
+        fn call(&self, ctx: &mut Context<'_>, mut args: Vec<EpBinding>) -> Result<EvalPlan, CompileError> {
+            if args.len() > 1 {
+                return Err(CompileError::TooManyArgs {
+                    fn_name: "$h".into(),
+                    maximum: 1,
+                    actual: args.len(),
+                });
+            }
+
+            let not_enough_args = CompileError::NotEnoughArgs {
+                fn_name: "$h".into(),
+                required: 1,
+                actual: args.len(),
+            };
+
+            let EpBinding::Single(arg0) = args.pop().ok_or(not_enough_args.clone())? else {
+                return Err(CompileError::InvalidOperand("A single value binding is expected"));
+            };
+
+            let destination = ctx.next_address.offset_by(1);
+            let instructions = vec![
+              Instruction::UnaryArithmetic {
+                arithmetic: UnaryArithmetic {
+                  operation: UnaryOperation::$h,
+                  operand: Operand::Reference(arg0)
+                },
+                destination: Destination::Address(destination)
+              }
+            ];
+
+            Ok(EvalPlan {
+                instructions,
+                binding: EpBinding::Single(destination),
+            })
+        }
+    }
+
+    define_unary!($($r)*);
+  };
+}
+
+define_unary!(Abs Acos Asin Atan Ceil Cos Floor Ln Log10 Log2 Sin Sqrt Tan ToDegrees ToRadians);
+
+/// The identity function. Always returns its first input.
+/// Implemented purely on the KCL side so it doesn't need to be in the
+/// define_unary! macro above.
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(Eq, PartialEq))]
+pub struct Id;
+
 impl Callable for Id {
     fn call(&self, _: &mut Context<'_>, args: Vec<EpBinding>) -> Result<EvalPlan, CompileError> {
         if args.len() > 1 {
@@ -56,44 +112,53 @@ impl Callable for Id {
     }
 }
 
-/// A test function that adds two numbers.
-#[derive(Debug, Clone)]
-#[cfg_attr(test, derive(Eq, PartialEq))]
-pub struct Add;
+/// Binary operator macro to quickly create new bindings.
+macro_rules! define_binary {
+  () => {};
+  ($h:ident$( $r:ident)*) => {
+    #[derive(Debug, Clone)]
+    #[cfg_attr(test, derive(Eq, PartialEq))]
+    pub struct $h;
 
-impl Callable for Add {
-    fn call(&self, ctx: &mut Context<'_>, mut args: Vec<EpBinding>) -> Result<EvalPlan, CompileError> {
-        let len = args.len();
-        if len > 2 {
-            return Err(CompileError::TooManyArgs {
-                fn_name: "add".into(),
-                maximum: 2,
-                actual: len,
-            });
+    impl Callable for $h {
+        fn call(&self, ctx: &mut Context<'_>, mut args: Vec<EpBinding>) -> Result<EvalPlan, CompileError> {
+          let len = args.len();
+          if len > 2 {
+              return Err(CompileError::TooManyArgs {
+                  fn_name: "$h".into(),
+                  maximum: 2,
+                  actual: len,
+              });
+          }
+          let not_enough_args = CompileError::NotEnoughArgs {
+              fn_name: "$h".into(),
+              required: 2,
+              actual: len,
+          };
+          const ERR: &str = "cannot use composite values (e.g. array) as arguments to $h";
+          let EpBinding::Single(arg1) = args.pop().ok_or(not_enough_args.clone())? else {
+              return Err(CompileError::InvalidOperand(ERR));
+          };
+          let EpBinding::Single(arg0) = args.pop().ok_or(not_enough_args)? else {
+              return Err(CompileError::InvalidOperand(ERR));
+          };
+          let destination = ctx.next_address.offset_by(1);
+          Ok(EvalPlan {
+              instructions: vec![Instruction::BinaryArithmetic {
+                  arithmetic: BinaryArithmetic {
+                      operation: BinaryOperation::$h,
+                      operand0: Operand::Reference(arg0),
+                      operand1: Operand::Reference(arg1),
+                  },
+                  destination: Destination::Address(destination),
+              }],
+              binding: EpBinding::Single(destination),
+          })
         }
-        let not_enough_args = CompileError::NotEnoughArgs {
-            fn_name: "add".into(),
-            required: 2,
-            actual: len,
-        };
-        const ERR: &str = "cannot use composite values (e.g. array) as arguments to Add";
-        let EpBinding::Single(arg1) = args.pop().ok_or(not_enough_args.clone())? else {
-            return Err(CompileError::InvalidOperand(ERR));
-        };
-        let EpBinding::Single(arg0) = args.pop().ok_or(not_enough_args)? else {
-            return Err(CompileError::InvalidOperand(ERR));
-        };
-        let destination = ctx.next_address.offset_by(1);
-        Ok(EvalPlan {
-            instructions: vec![Instruction::BinaryArithmetic {
-                arithmetic: BinaryArithmetic {
-                    operation: kittycad_execution_plan::BinaryOperation::Add,
-                    operand0: kittycad_execution_plan::Operand::Reference(arg0),
-                    operand1: kittycad_execution_plan::Operand::Reference(arg1),
-                },
-                destination: Destination::Address(destination),
-            }],
-            binding: EpBinding::Single(destination),
-        })
     }
+
+    define_binary!($($r)*);
+  };
 }
+
+define_binary!(Add Log Max Min);

src/wasm-lib/grackle/src/native_functions/sketch/helpers.rs

@@ -67,6 +67,12 @@ pub fn sg_binding(
             actual: "function".to_owned(),
             arg_number,
         }),
+        EpBinding::Constant(_) => Err(CompileError::ArgWrongType {
+            fn_name,
+            expected,
+            actual: "constant".to_owned(),
+            arg_number,
+        }),
     }
 }
 pub fn single_binding(
@@ -101,6 +107,12 @@ pub fn single_binding(
             actual: "function".to_owned(),
             arg_number,
         }),
+        EpBinding::Constant(_) => Err(CompileError::ArgWrongType {
+            fn_name,
+            expected,
+            actual: "constant".to_owned(),
+            arg_number,
+        }),
     }
 }
 
@@ -136,6 +148,12 @@ pub fn sequence_binding(
             actual: "function".to_owned(),
             arg_number,
         }),
+        EpBinding::Constant(_) => Err(CompileError::ArgWrongType {
+            fn_name,
+            expected,
+            actual: "constant".to_owned(),
+            arg_number,
+        }),
     }
 }
 

src/wasm-lib/grackle/src/tests.rs

@@ -1,7 +1,7 @@
 use std::{collections::HashMap, env};
 
-use ep::{sketch_types, Destination, UnaryArithmetic};
-use ept::{ListHeader, ObjectHeader};
+use ep::{constants, sketch_types, Destination, UnaryArithmetic};
+use ept::{ListHeader, ObjectHeader, Primitive};
 use kittycad_modeling_cmds::shared::Point2d;
 use kittycad_modeling_session::SessionBuilder;
 use pretty_assertions::assert_eq;
@@ -1414,3 +1414,31 @@ fn mod_and_pow() {
         ]
     );
 }
+#[tokio::test]
+async fn cos_sin_pi() {
+    let program = "
+        let x = cos(45.0)*10
+        let y = sin(45.0)*10
+        let z = PI
+        ";
+    let (_plan, scope, _) = must_plan(program);
+    let Some(EpBinding::Single(x)) = scope.get("x") else {
+        panic!("Unexpected binding for variable 'x': {:?}", scope.get("x"));
+    };
+    let Some(EpBinding::Single(y)) = scope.get("y") else {
+        panic!("Unexpected binding for variable 'y': {:?}", scope.get("y"));
+    };
+    let Some(EpBinding::Constant(z)) = scope.get("z") else {
+        panic!("Unexpected binding for variable 'z': {:?}", scope.get("z"));
+    };
+    let ast = kcl_lib::parser::Parser::new(kcl_lib::token::lexer(program))
+        .ast()
+        .unwrap();
+    let mem = crate::execute(ast, &mut None).await.unwrap();
+    use ept::ReadMemory;
+    assert_eq!(*mem.get(x).unwrap(), Primitive::from(5.253219888177298));
+    assert_eq!(*mem.get(y).unwrap(), Primitive::from(8.509035245341185));
+
+    // Constants don't live in memory.
+    assert_eq!(*z, constants::PI);
+}

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

@@ -3,6 +3,7 @@
 
 use std::sync::{Arc, Mutex};
 
+use crate::executor::SourceRange;
 use anyhow::{anyhow, Result};
 use dashmap::DashMap;
 use futures::{SinkExt, StreamExt};
@@ -71,20 +72,113 @@ struct ToEngineReq {
     request_sent: oneshot::Sender<Result<()>>,
 }
 
+fn is_cmd_with_return_values(cmd: &kittycad::types::ModelingCmd) -> bool {
+    let (kittycad::types::ModelingCmd::Export { .. }
+    | kittycad::types::ModelingCmd::Extrude { .. }
+    | kittycad::types::ModelingCmd::SketchModeDisable { .. }
+    | kittycad::types::ModelingCmd::ObjectBringToFront { .. }
+    | kittycad::types::ModelingCmd::SelectWithPoint { .. }
+    | kittycad::types::ModelingCmd::HighlightSetEntity { .. }
+    | kittycad::types::ModelingCmd::EntityGetChildUuid { .. }
+    | kittycad::types::ModelingCmd::EntityGetNumChildren { .. }
+    | kittycad::types::ModelingCmd::EntityGetParentId { .. }
+    | kittycad::types::ModelingCmd::EntityGetAllChildUuids { .. }
+    | kittycad::types::ModelingCmd::CameraDragMove { .. }
+    | kittycad::types::ModelingCmd::CameraDragEnd { .. }
+    | kittycad::types::ModelingCmd::DefaultCameraGetSettings { .. }
+    | kittycad::types::ModelingCmd::DefaultCameraZoom { .. }
+    | kittycad::types::ModelingCmd::SelectGet { .. }
+    | kittycad::types::ModelingCmd::Solid3DGetAllEdgeFaces { .. }
+    | kittycad::types::ModelingCmd::Solid3DGetAllOppositeEdges { .. }
+    | kittycad::types::ModelingCmd::Solid3DGetOppositeEdge { .. }
+    | kittycad::types::ModelingCmd::Solid3DGetNextAdjacentEdge { .. }
+    | kittycad::types::ModelingCmd::Solid3DGetPrevAdjacentEdge { .. }
+    | kittycad::types::ModelingCmd::GetEntityType { .. }
+    | kittycad::types::ModelingCmd::CurveGetControlPoints { .. }
+    | kittycad::types::ModelingCmd::CurveGetType { .. }
+    | kittycad::types::ModelingCmd::MouseClick { .. }
+    | kittycad::types::ModelingCmd::TakeSnapshot { .. }
+    | kittycad::types::ModelingCmd::PathGetInfo { .. }
+    | kittycad::types::ModelingCmd::PathGetCurveUuidsForVertices { .. }
+    | kittycad::types::ModelingCmd::PathGetVertexUuids { .. }
+    | kittycad::types::ModelingCmd::CurveGetEndPoints { .. }
+    | kittycad::types::ModelingCmd::FaceIsPlanar { .. }
+    | kittycad::types::ModelingCmd::FaceGetPosition { .. }
+    | kittycad::types::ModelingCmd::FaceGetGradient { .. }
+    | kittycad::types::ModelingCmd::PlaneIntersectAndProject { .. }
+    | kittycad::types::ModelingCmd::ImportFiles { .. }
+    | kittycad::types::ModelingCmd::Mass { .. }
+    | kittycad::types::ModelingCmd::Volume { .. }
+    | kittycad::types::ModelingCmd::Density { .. }
+    | kittycad::types::ModelingCmd::SurfaceArea { .. }
+    | kittycad::types::ModelingCmd::CenterOfMass { .. }
+    | kittycad::types::ModelingCmd::GetSketchModePlane { .. }
+    | kittycad::types::ModelingCmd::EntityGetDistance { .. }
+    | kittycad::types::ModelingCmd::EntityLinearPattern { .. }
+    | kittycad::types::ModelingCmd::EntityCircularPattern { .. }
+    | kittycad::types::ModelingCmd::Solid3DGetExtrusionFaceInfo { .. }) = cmd
+    else {
+        return false;
+    };
+
+    true
+}
+
 impl EngineConnection {
     /// Start waiting for incoming engine requests, and send each one over the WebSocket to the engine.
     async fn start_write_actor(mut tcp_write: WebSocketTcpWrite, mut engine_req_rx: mpsc::Receiver<ToEngineReq>) {
+        let mut batch: Vec<kittycad::types::ModelingCmdReq> = vec![];
+
         while let Some(req) = engine_req_rx.recv().await {
             let ToEngineReq { req, request_sent } = req;
-            let res = if let kittycad::types::WebSocketRequest::ModelingCmdReq {
-                cmd: kittycad::types::ModelingCmd::ImportFiles { .. },
-                cmd_id: _,
-            } = &req
-            {
+            let kittycad::types::WebSocketRequest::ModelingCmdReq { cmd, cmd_id } = &req else {
+                return;
+            };
+
+            let res = if let kittycad::types::ModelingCmd::ImportFiles { .. } = cmd {
                 // Send it as binary.
                 Self::inner_send_to_engine_binary(req, &mut tcp_write).await
             } else {
-                Self::inner_send_to_engine(req, &mut tcp_write).await
+                // Backported from the new Grackle-core KCL.
+                // We will batch all commands until we hit one which has
+                // return values we want to wait for. Currently, that means
+                // waiting for API requests with return values that are not just
+                // request confirmations (ex. face or edge data).
+
+                batch.push(kittycad::types::ModelingCmdReq {
+                    cmd: cmd.clone(),
+                    cmd_id: *cmd_id,
+                });
+
+                if is_cmd_with_return_values(cmd) || *cmd_id == uuid::Uuid::nil() {
+                    // If the batch has zero commands, and we're about to load
+                    // a command that has return values, don't wrap it in a
+                    // ModelingCmdBatchReq.
+                    let future = if batch.len() == 1 {
+                        Self::inner_send_to_engine(
+                            kittycad::types::WebSocketRequest::ModelingCmdReq {
+                                cmd: cmd.clone(),
+                                cmd_id: *cmd_id,
+                            },
+                            &mut tcp_write,
+                        )
+                    } else {
+                        // Serde will properly serialize these.
+                        Self::inner_send_to_engine(
+                            kittycad::types::WebSocketRequest::ModelingCmdBatchReq {
+                                requests: batch.clone(),
+                            },
+                            &mut tcp_write,
+                        )
+                    };
+
+                    // Prepare for a new batch of instructions.
+                    batch.clear();
+
+                    future.await
+                } else {
+                    Ok(())
+                }
             };
             let _ = request_sent.send(res);
         }
@@ -163,7 +257,7 @@ impl EngineManager for EngineConnection {
     async fn send_modeling_cmd(
         &self,
         id: uuid::Uuid,
-        source_range: crate::executor::SourceRange,
+        source_range: SourceRange,
         cmd: kittycad::types::ModelingCmd,
     ) -> Result<OkWebSocketResponseData, KclError> {
         let (tx, rx) = oneshot::channel();
@@ -200,7 +294,18 @@ impl EngineManager for EngineConnection {
                 })
             })?;
 
-        // Wait for the response.
+        // Only wait for a response if it's a command *with* return values
+        // So most of the time, this condition will be true.
+        if !is_cmd_with_return_values(&cmd) {
+            // Simulate an empty response type
+            return Ok(OkWebSocketResponseData::Modeling {
+                modeling_response: kittycad::types::OkModelingCmdResponse::Empty {},
+            });
+        }
+
+        // If it's a submitted batch, we want to check the batch return value
+        // in case of any errors.
+
         let current_time = std::time::Instant::now();
         while current_time.elapsed().as_secs() < 60 {
             if let Ok(guard) = self.socket_health.lock() {

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

@@ -10,6 +10,24 @@ pub mod conn_wasm;
 
 #[async_trait::async_trait]
 pub trait EngineManager: std::fmt::Debug + Send + Sync + 'static {
+    /// Tell the EngineManager there will be no more commands.
+    /// We send a "dummy command" to signal EngineConnection that we're
+    /// at the end of the program and there'll be no more requests.
+    /// This means in tests, where it's impossible to look ahead, we'll need to
+    /// add this to mark the end of commands.
+    /// In compiled KCL tests, it will be auto-inserted.
+    async fn signal_end(&self) -> Result<kittycad::types::OkWebSocketResponseData, crate::errors::KclError> {
+        self.send_modeling_cmd(
+            // THE NIL UUID IS THE SIGNAL OF THE END OF TIMES FOR THIS POOR PROGRAM.
+            uuid::Uuid::nil(),
+            // This will be ignored.
+            crate::executor::SourceRange([0, 0]),
+            // This will be ignored. It was one I found with no fields.
+            kittycad::types::ModelingCmd::EditModeExit {},
+        )
+        .await
+    }
+
     /// Send a modeling command and wait for the response message.
     async fn send_modeling_cmd(
         &self,

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

@@ -1219,6 +1219,9 @@ pub async fn execute(
         }
     }
 
+    // Signal to engine we're done. Flush the batch.
+    ctx.engine.signal_end().await?;
+
     Ok(memory.clone())
 }
 

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

@@ -165,6 +165,7 @@ async fn inner_get_opposite_edge(tag: String, extrude_group: Box<ExtrudeGroup>,
             },
         )
         .await?;
+
     let kittycad::types::OkWebSocketResponseData::Modeling {
         modeling_response: kittycad::types::OkModelingCmdResponse::Solid3DGetOppositeEdge { data: opposite_edge },
     } = &resp

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

@@ -915,7 +915,7 @@ async fn start_sketch_on_face(
             })
             .ok_or_else(|| {
                 KclError::Type(KclErrorDetails {
-                    message: format!("Expected a face with the tag `{}`", tag),
+                    message: format!("Expected a face with the tag `{}` for sketch", tag),
                     source_ranges: vec![args.source_range],
                 })
             })??,