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STEP2_COMPLETE.md

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Step 2 Complete: Macro Call Argument Capture

Date: 2026-02-24
Status: ✅ COMPLETE

Summary

Successfully implemented detection and capture of macro call arguments as Closures. When code like closure(add) is encountered where closure is a macro, the argument add is now captured with its AST and out-of-scope references instead of being bundled normally.

What Works Now

const add = (a, b) => a + b;
const addClosure = closure(add);  // ← argument captured!

When closure(add) is encountered:

  1. Detects closure is a macro (via createMacro)
  2. Captures add as Closure { expression, references }
  3. Creates ClosureValue node in dependency graph
  4. Preserves references to external definitions

Implementation Details

New Components

  1. Closure Type (src/execution_request/closure.rs)

    • Holds expression: Expr (AST)
    • Holds references: HashMap<String, FuneeIdentifier> (out-of-scope refs)

  2. Declaration::ClosureValue Variant

    • New declaration type for captured closures
    • Integrated into reference handling

  3. Macro Call Detection (src/execution_request/detect_macro_calls.rs)

    • AST visitor finds macro calls
    • Extracts arguments for capture

  4. Closure Capture Logic (src/execution_request/capture_closure.rs)

    • Analyzes expression for references
    • Filters to out-of-scope only
    • Returns Closure object

  5. Two-Pass Graph Construction (src/execution_request/source_graph.rs)

    • Pass 1: Build dependency graph normally
    • Pass 2: Process macro calls, capture arguments

Tests

Unit Tests (8/8 passing)

  • test_macro_detection - Macro definitions detected
  • test_macro_functions_tracked_in_source_graph - Macros tracked
  • test_macro_call_argument_captured_as_closure - Arguments captured ✨ NEW
  • test_capture_closure_with_no_references - Literal capture
  • test_capture_closure_with_references - Reference capture
  • test_find_macro_call - Macro call detection
  • test_no_macro_calls - Regular calls not confused

E2E Test

  • File: tests/cli.test.ts
  • Fixture: tests/fixtures/macro/step2_argument_capture.ts
  • Test: "detects macro calls and captures arguments (Step 2)"
  • Status: ✅ PASSING

Commits

  1. 7e0d0eb - Step 2 implementation + documentation

    • All Rust implementation
    • STEP2_IMPLEMENTATION.md
    • Updated MACRO_IMPLEMENTATION_PROGRESS.md

  2. 9e193f9 - E2E test (retroactive)

    • Added to tests/cli.test.ts
    • Created fixture file

Lesson Learned: TDD

Important: This implementation was done backwards from PLAYBOOK.md!

Should have been:

  1. Write E2E test first (see it fail)
  2. Implement Step 2
  3. See test pass
  4. Commit together

What actually happened:

  1. Implemented Step 2
  2. Wrote unit tests
  3. Added E2E test retroactively
  4. Committed separately

For Step 3 and beyond: Follow PLAYBOOK.md strictly!

  • Write E2E test FIRST
  • Watch it fail
  • Implement
  • Watch it pass
  • Commit together

Documentation

  • STEP2_IMPLEMENTATION.md - Full implementation details
  • MACRO_IMPLEMENTATION_PROGRESS.md - Roadmap and progress
  • DESIGN-MACROS.md - Original design document

Next Steps

Step 3: Macro Execution

Execute macro functions at bundle time using deno_core:

  1. Get macro function from Declaration::Macro
  2. Get captured ClosureValue arguments
  3. Execute macro function in JS runtime
  4. Get back transformed Closure result
  5. Replace macro call with result expression
  6. Handle reference conflicts (IIFE wrapping)

Key Challenge: Need to serialize Rust AST to JavaScript and back.

Estimated Complexity: High (requires deno_core integration)

Files Changed

Implementation

  • src/execution_request.rs - Added new modules
  • src/execution_request/closure.rs - New
  • src/execution_request/declaration.rs - Added ClosureValue variant
  • src/execution_request/capture_closure.rs - New
  • src/execution_request/detect_macro_calls.rs - New
  • src/execution_request/source_graph.rs - Two-pass construction
  • src/execution_request/get_references_from_declaration.rs - Updated for ClosureValue

Tests

  • src/execution_request/tests.rs - New unit test
  • tests/cli.test.ts - New E2E test
  • tests/fixtures/macro/step2_argument_capture.ts - New fixture

Documentation

  • STEP2_IMPLEMENTATION.md - New
  • MACRO_IMPLEMENTATION_PROGRESS.md - Updated
  • STEP2_COMPLETE.md - This file

References

  • Original implementation: ~/clawd/agents/riff/repos/everything/opah/
  • Design document: DESIGN-MACROS.md
  • Test file: tests/cli.test.ts
  • Fixture: tests/fixtures/macro/step2_argument_capture.ts