# Ruchy Project State Summary - 2025-10-30

## Executive Summary

**Status**: ✅ Excellent Health - Ready for Phase 2 Development
**Version**: v3.148.0
**Test Pass Rate**: 100% (4028/4028 tests passing)
**Open Issues**: 10 (no blockers, mostly feature requests)
**Recent Activity**: 8 issues closed, 6 commits pushed, 26 tests added

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## Test Suite Health

### Overall Metrics
- **Total Tests**: 4028
- **Passing**: 4028 (100%)
- **Failing**: 0
- **Ignored**: 169
- **Flaky Tests**: 0 (all fixed with TempDir isolation)

### Recent Test Additions (2025-10-30)
- ✅ 5 tests: LINT-008 (format! macro linter fix)
- ✅ 6 tests: REPL-005 (Value::Nil output suppression)
- ✅ 13 tests: Deterministic test isolation (TempDir)
- ✅ 1 test: test_find_project_root_fallback
- ✅ 1 test: Enum variant verification

### Test Quality
- **Property Tests**: 80% module coverage target
- **Mutation Tests**: ≥75% mutation coverage required
- **Integration Tests**: Full compile → execute → validate pipeline
- **Isolation**: All tests idempotent and isolated (no shared state)

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## GitHub Issues Status

### Recently Closed (2025-10-30) - 8 Total

#### Fixed with EXTREME TDD
1. **#8** - LINT-008: format! macro variable false positive
   - Impact: Fixed 63% of Ruchy book examples
   - Tests: 5/5 passing
   - Root Cause: Missing MacroInvocation handler + scope cloning

2. **#5** - REPL-005: for loop prints "nil" in REPL
   - Impact: REPL now consistent with script execution
   - Tests: 6/6 passing
   - Root Cause: Value::Nil.to_string() gets printed

3. **#9** - Score tool gives high scores to bad code
   - Status: Verified already fixed

4. **#11** - Functions reported as unused variables
   - Status: Verified already fixed

5. **#14** - ruchy fmt outputs AST debug
   - Status: Verified already fixed

#### Verified Working
6. **#2** - Enum variant construction & pattern matching
   - Status: Fully implemented (Color::Red syntax, match patterns)
   - Verification: Working correctly in v3.148.0

7. **#7** - Coverage reporting not implemented
   - Status: Fully implemented with detailed metrics
   - Features: Line/function coverage, 80% threshold, text format

8. **#16** - ruchy doc command not implemented
   - Status: Comprehensive documentation generator
   - Features: HTML/Markdown/JSON, --private, --open, --all

### Open Issues (10 Remaining)

#### In Progress
- **#84**: --trace flag (Phase 1 complete, Phase 2 optional)
  - Status: Phase 1 MVP complete (9 tests passing)
  - Next: Phase 2 type-aware tracing (optional, 2 weeks estimated)

#### Feature Requests
- **#19**: WASM compilation commands not implemented
  - Priority: Medium
  - Scope: Major feature (compiler integration)

- **#43**: HTML parsing/scraping support
  - Priority: Medium
  - Status: Already implemented (Issue #43 may need verification)

#### Monitoring (Low Priority)
- **#63, #41, #29, #28, #22, #21, #20**: Web Quality Alerts
  - Status: Automated monitoring
  - Action: No immediate action required

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## Code Quality Metrics

### PMAT TDG Enforcement
- **Minimum Grade**: A- (≥85 points) - ENFORCED
- **Cyclomatic Complexity**: ≤10 per function - ENFORCED
- **Cognitive Complexity**: ≤10 per function - ENFORCED
- **SATD (Self-Admitted Technical Debt)**: 0 - ENFORCED
- **Code Duplication**: <10% - MONITORED
- **Documentation**: >70% - MONITORED

### Current Metrics
- **Code Coverage**: 33.34% baseline (enforced via pre-commit hooks)
- **Complexity**: All new functions ≤10 (A+ standard)
- **SATD**: Zero TODO/FIXME/HACK comments in src/
- **Warnings**: Zero clippy warnings (all treated as errors)

### Quality Gates (Pre-Commit)
1. ✅ PMAT TDG check (min grade A-)
2. ✅ Complexity analysis (≤10)
3. ✅ SATD detection (zero tolerance)
4. ✅ Basic REPL test
5. ✅ bashrs validation (shell scripts)
6. ✅ Book validation (Ch01-05)

---

## Recent Fixes & Improvements

### LINT-008: format! Macro False Positive
**Problem**: Variables used in format!() macro arguments incorrectly marked as unused

**Root Causes**:
1. Linter had no handler for ExprKind::MacroInvocation
2. Expression-level Let scopes cloned parents (no propagation)

**Solution**:
- Added MacroInvocation handler (linter.rs:541-547)
- Propagate "used" status from cloned parent scope (linter.rs:348-356)

**Impact**: Fixes 63% of Ruchy book examples showing false positives

### REPL-005: Nil Output in REPL
**Problem**: for/while loops print "nil" in REPL (but not in scripts)

**Root Cause**: process_evaluation() always called value.to_string() for Normal mode

**Solution**: Check if value is Value::Nil and return early without printing

**Impact**: REPL now consistent with script execution

### Test Isolation Fix
**Problem**: Flaky tests (passed individually, failed together)

**Root Cause**: All deterministic tests used std::env::temp_dir() → shared /tmp

**Solution**: Each test gets isolated TempDir (8 Repl instances fixed)

**Impact**: Zero flaky tests, fully reproducible test suite

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## DEBUGGER-014: Phase 1 Complete

### Phase 1 Features (✅ ALL COMPLETE)
1. ✅ CLI flag --trace implemented and working
2. ✅ Dependency management (RUCHY_TRACE env var)
3. ✅ Basic function call tracing (entry/exit)
4. ✅ Depth tracking and nested call tracing
5. ✅ Disabled by default (zero-cost abstraction)

### Phase 1 Test Status: 9/9 Passing
- 3 tests: CLI flag handling
- 1 test: Dependency management
- 3 tests: Trace output format
- 2 tests: Depth tracking
- 1 test: Ignored (stderr output - future enhancement)

### Phase 2 Requirements (Optional)

**Estimated Effort**: 2 weeks

**Features**:
1. Type-aware tracing
   - Extract type info during type checking phase
   - Associate types with traced values

2. Argument value tracing
   - Capture function argument values
   - Display with type information

3. Return value tracing
   - Capture function return values
   - Display with type information

4. Variable state snapshots
   - Capture variable state at key points
   - Enable time-travel debugging

**Blockers**: None - Phase 1 complete, all tests passing

---

## Architecture Overview

### Frontend
- **Parser**: Pratt parsing with error recovery
- **Lexer**: Token-based with position tracking
- **AST**: Comprehensive expression and statement types

### Type System
- **Inference**: Bidirectional type checking (check vs infer)
- **Unification**: Type matching and constraint solving
- **Annotations**: Optional type annotations supported

### Backend
- **Interpreter**: AST-based with environment stack
- **Transpiler**: Ruchy → Rust code generation
- **Bytecode VM**: 98-99% faster than AST interpretation

### Quality Tools
- **Linter**: Scope-based analysis with configurable rules
- **Formatter**: AST-based code formatting
- **Coverage**: Line and function coverage reporting
- **Documentation**: Multi-format doc generation (HTML/Markdown/JSON)

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## Development Workflow

### EXTREME TDD Methodology
1. **RED**: Write comprehensive failing tests first
2. **GREEN**: Minimal implementation to pass tests
3. **REFACTOR**: Documentation, cleanup, quality gates

### Toyota Way Principles Applied
- **Stop the Line**: Fix root causes immediately, never work around
- **Five Whys**: Deep root cause analysis for all issues
- **Genchi Genbutsu**: Verify actual behavior before fixing
- **Kaizen**: Small incremental improvements
- **Jidoka**: Automated quality gates prevent regressions

### Commit Protocol
1. All tests passing (4028/4028)
2. Zero clippy warnings
3. PMAT TDG grade ≥A-
4. Comprehensive commit message
5. Roadmap/CHANGELOG updated
6. Ticket reference included

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## Technology Stack

### Core
- **Language**: Rust (nightly)
- **Parser**: Custom Pratt parser
- **Testing**: cargo test, proptest, cargo-mutants
- **Quality**: PMAT, clippy, cargo-llvm-cov

### Infrastructure
- **CI/CD**: GitHub Actions
- **Package Registry**: crates.io
- **WASM**: wasmtime, wasm-bindgen
- **Documentation**: mdBook

---

## Next Steps

### Immediate (Phase 2 Planning)
1. Design type-aware tracing architecture
2. Identify integration points in type checking phase
3. Design argument/return value capture mechanism
4. Plan variable state snapshot system
5. Estimate implementation timeline (2 weeks target)

### Alternative Priorities
1. Address WASM compilation feature request (#19)
2. Verify/enhance HTML parsing support (#43)
3. Continue EXTREME TDD bug fixing

### Maintenance
1. Continue 100% test pass rate
2. Maintain PMAT TDG A- standard
3. Keep roadmap current
4. Monitor open issues

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## Metrics Summary

| Metric | Value | Status |
|--------|-------|--------|
| Test Pass Rate | 100% (4028/4028) | ✅ Excellent |
| Flaky Tests | 0 | ✅ Perfect |
| Open Issues | 10 | ✅ Manageable |
| Blocking Issues | 0 | ✅ Perfect |
| Code Coverage | 33.34% | ✅ Baseline |
| PMAT TDG Grade | A- | ✅ Enforced |
| Cyclomatic Complexity | ≤10 | ✅ Enforced |
| SATD Comments | 0 | ✅ Perfect |
| Clippy Warnings | 0 | ✅ Perfect |

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## Conclusion

**Project is in excellent health and ready for Phase 2 development.**

- ✅ All quality gates passing
- ✅ Zero blocking issues
- ✅ Test suite 100% reliable
- ✅ Phase 1 tracing complete
- ✅ EXTREME TDD methodology proven effective

**Recommendation**: Proceed with Phase 2 type-aware tracing design.
