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**Table of Contents**

- [Phase 2: Compile-Time Validation - Implementation](#phase-2-compile-time-validation---implementation)
  - [Status: ✅ Complete](#status--complete)
    - [Deliverables](#deliverables)
    - [Compile-Time Validation Features](#compile-time-validation-features)
      - [CLI Command Validation](#cli-command-validation)
      - [Test Configuration Validation](#test-configuration-validation)
    - [Integration with `cargo make check`](#integration-with-cargo-make-check)
    - [Benefits](#benefits)
    - [Next Steps](#next-steps)

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# Phase 2: Compile-Time Validation - Implementation

## Status: ✅ Complete

### Deliverables

1. **Validation Module** (`crates/ggen-cli/src/validation/mod.rs`)
   - `CommandValidator`: Validates CLI command structure at compile time
   - `TestConfigValidator`: Validates clnrm test configurations
   - `ValidationError`: Type-safe error handling
   - `validate_command!` macro: Compile-time command validation

2. **Build Script** (`build.rs`)
   - Validates clnrm test configurations at compile time
   - Integrates with `cargo make check`
   - Provides compile-time warnings for invalid configurations

3. **Integration**
   - Added validation module to `crates/ggen-cli/src/lib.rs`
   - Build script validates test configurations during compilation
   - Compile-time checks run automatically with `cargo make check`

### Compile-Time Validation Features

#### CLI Command Validation

```rust
// Validate command structure at compile time
validate_command!("ci", "workflow", [("name", false)]);

// Ensures:
// - Command name is valid
// - Required arguments are present
// - Argument types are valid
// - Command structure matches expectations
```

#### Test Configuration Validation

```rust
// Validates clnrm test files at compile time
TestConfigValidator::validate_clnrm_config(path)?;

// Checks:
// - TOML syntax is valid
// - Required fields are present
// - Container images are specified
// - Assertions are valid
```

### Integration with `cargo make check`

The validation runs automatically during compilation:

```bash
cargo make check
# → Compiles code
# → Validates CLI commands
# → Validates test configurations
# → Reports any validation errors
```

### Benefits

1. **Early Detection**: Catch issues before code runs
2. **Type Safety**: Compile-time guarantees for CLI correctness
3. **Zero Runtime Cost**: Validation happens at compile time
4. **Developer Experience**: Clear error messages for invalid configurations

### Next Steps

**Phase 3: Runtime Validation** (2-3 hours)
- Add pre-commit validation hooks
- Add CLI command verification to pre-commit
- Add validation reporting

---

**Status**: Phase 2 Complete ✅
**Next**: Phase 3 (Runtime Validation)
**Total Progress**: 2/4 phases complete




