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‎PR_DESCRIPTION.md‎

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# Phase 1 + 2: Foundation and Repository Pattern - Hexagonal Architecture
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This PR implements Phases 1 and 2 of the Pet architecture refactoring, establishing the foundation for hexagonal architecture (ports & adapters pattern) and adding a file-based repository implementation with full backward compatibility.
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## Phase 1: Foundation - Domain Layer
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**What's Included:**
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### Core Domain Models
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- `Snippet` struct with validation, tag matching
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- `Parameter` struct for command placeholders
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- Pure business logic with zero I/O dependencies
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### Repository Interface (Port)
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- `SnippetRepository` interface for storage abstraction
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- `MockRepository` for testing
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- Methods: `Load()`, `Save()`, `FindByDescription()`, `FindByID()`, `FilterByTags()`
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### Selector Interface (Port)
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- `Selector` interface for snippet selection abstraction
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- `DirectSelector` - exact match (for CLI-first mode)
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- `FirstMatchSelector` - auto-select first match
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- `MockSelector` for testing
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### ParameterInput Interface (Port)
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- `ParameterInput` interface for getting parameter values
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- `DefaultParameterInput` - uses defaults without prompting
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- `FlagParameterInput` - from CLI flags (with fallback to defaults)
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- `PositionalParameterInput` - from positional args
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- `MockParameterInput` for testing
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### SnippetService (Business Logic)
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- `ExtractParameters()` - parses `<param>`, `<param=default>`, `<param=|_v1_||_v2_|>`
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- `SubstituteParameters()` - replaces placeholders with values
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- Repository operations: `GetAll()`, `GetByDescription()`, `FilterByTags()`, `Create()`, `Update()`, `Delete()`
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- Full validation and error handling
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- Optimized: regex compiled once at package level
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## Phase 2: Repository Pattern - FileRepository
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**What's Included:**
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### FileRepository Implementation
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- Implements `domain.SnippetRepository` using TOML files
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- Does NOT depend on global `config.Conf` - receives paths via constructor for testability
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- TOML format identical to existing format (verified by compatibility tests)
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- Supports multi-file and directory configurations
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### Path Validation
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- Validates snippet filenames are in valid locations (main file or snippet directories)
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- Prevents Save/Load drift where snippets can be saved but not loaded back
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- Returns clear errors for invalid paths
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### Error Handling
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- Logs errors when files are inaccessible during directory walks
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- Doesn't silently skip corrupt/unreadable files
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- Proper error messages for all failure modes
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### Compatibility
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- Both old (`snippet/`) and new (`infrastructure/`) code can read/write the same files
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- Compatibility tests verify round-trip in both directions
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- Multiline commands preserved correctly
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## Migration Documentation
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**`MIGRATION.md`** documents:
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- Full 7-phase migration plan with architecture diagrams
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- How old and new code coexist during transition
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- Which GitHub issues will be resolved in Phase 6
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- What changed (and didn't change) in each phase
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## Test Coverage
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### Phase 1 Tests (100+ test cases)
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- Core models: `Snippet`, `Parameter` validation and tag matching
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- All interfaces: Repository, Selector, ParameterInput with multiple implementations
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- SnippetService: parameter extraction, substitution, CRUD operations
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- Integration tests showing full workflows
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### Phase 2 Tests (20+ test cases)
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- FileRepository: load, save, multi-file, directories, error cases
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- Path validation: valid/invalid paths, drift prevention
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- Compatibility: bidirectional with existing `snippet.Snippets`
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- Round-trip: multiline commands, tags, all fields preserved
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**All tests passing** ✅ - both new tests and all existing project tests.
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## Files Added
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```
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domain/
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├── snippet.go, snippet_test.go # Core models
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├── repository.go, repository_test.go # Storage interface (port)
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├── selector.go, selector_test.go # Selection interface (port)
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├── parameter_input.go, parameter_input_test.go # Input interface (port)
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└── snippet_service.go, snippet_service_test.go # Business logic
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infrastructure/
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├── file_repository.go, file_repository_test.go # TOML storage implementation
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├── compat_test.go # Compatibility with existing code
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└── validation_test.go # Path validation tests
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MIGRATION.md # Full migration plan
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```
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## What Was NOT Changed
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All existing code remains untouched:
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- `snippet/` package - existing TOML loading/saving
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- `cmd/` package - all commands continue to work
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- `dialog/` package - gocui parameter dialog
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- `config/` package - configuration handling
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The `domain/` and `infrastructure/` packages are purely additive.
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## Benefits
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### 1. Testability ✅
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- Core logic is pure functions - trivial to unit test
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- Mock adapters eliminate need for actual gocui/fzf in tests
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- Test coverage can be comprehensive
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### 2. Flexibility ✅
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- Interfaces allow swapping implementations (interactive CUI vs direct CLI)
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- Easy to add new adapters (REST API, HTTP server) in future
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- Business logic changes don't affect UI and vice versa
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### 3. Performance ✅
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- Regex compiled once at package level (not on every call)
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- Efficient file operations with proper error handling
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### 4. Maintainability ✅
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- Clear separation of concerns
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- Easy to understand and modify
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- Well-documented with MIGRATION.md
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## What's Next
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### Phase 3: Parameter Input Abstraction (Planned)
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Refactor `dialog/` package to wrap gocui behind `ParameterInput` interface
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### Phase 4: Selector Abstraction (Planned)
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Wrap fzf/peco selection behind `Selector` interface
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### Phase 5: Refactor Commands (Planned)
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Update all commands in `cmd/` to use new architecture
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### Phase 6: CLI-First Features (Planned)
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Add direct execution flags:
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```bash
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pet exec "docker ps"
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pet exec -d "docker run" --param container=nginx --param port=8080
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pet exec --first-match -q "docker"
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pet list --json
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pet new --command "ls -la" --tag list --description "List files"
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```
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**This will resolve GitHub issues:** #73, #84, #117, #147, #164, #352
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### Phase 7: Documentation & Polish (Planned)
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Update README, add architecture docs, prepare v2.0 release
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## Testing
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```bash
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# Run all tests
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go test ./...
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# Run domain tests
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go test ./domain/... -v
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# Run infrastructure tests (includes compatibility tests)
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go test ./infrastructure/... -v
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# Run with coverage
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go test ./... -cover
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```
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---
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**This PR is safe to merge** - it adds new, well-tested code but doesn't modify any existing functionality. All existing tests continue to pass.

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