hosts-go/memory-bank/progress.md

Progress: hosts-go

What Works

✅ Memory Bank Foundation

• Project documentation: Complete memory bank structure established
• Architecture planning: Clear technical design documented
• Development approach: TDD strategy and patterns defined
• Technology stack: Bubble Tea ecosystem selected and documented

✅ Project Definition

• Core requirements: Two-pane TUI for hosts file management clearly defined
• User experience: Safety-first approach with explicit edit mode
• Technical constraints: Permission model and file safety requirements established
• Directory structure: Planned layout for Go project organization

✅ Foundation Implementation (COMPLETED)

• Go module initialization: ✅ go.mod created with all core dependencies
• Directory structure: ✅ Complete project structure (cmd/, internal/, tests/)
• Core data models: ✅ internal/core/models.go with HostEntry and HostsFile structs
• Validation system: ✅ IP address and hostname validation with RFC compliance
• Test suite: ✅ Comprehensive tests (44 test cases, 100% passing)
• Demo application: ✅ Working cmd/hosts/main.go demonstrating functionality

✅ Phase 1: Core Functionality (COMPLETED)

• Hosts file parser: ✅ Complete internal/core/parser.go implementation
• Intelligent formatting: ✅ Adaptive spacing and column alignment with GCD-based detection
• File operations: ✅ Safe backup and atomic write operations
• Test coverage: ✅ 54 comprehensive tests (100% passing)
• Demo application: ✅ Full working demonstration with real-world examples
• Parser capabilities:
  • ✅ Standard entries: IPv4, IPv6, multiple aliases, inline comments
  • ✅ Comment handling: Disabled entries vs standalone comments with perfect classification
  • ✅ Error recovery: Malformed line handling with non-fatal warnings
  • ✅ Format preservation: Round-trip parsing maintains style while improving alignment
  • ✅ Style detection: GCD-based tab/space analysis with intelligent column widths
  • ✅ Search functionality: Find entries by hostname or alias with O(1) performance
• Safety features:
  • ✅ Backup system: Timestamped backups in ~/.config/hosts-go/ directory
  • ✅ Atomic operations: Temporary files with rollback capability prevent corruption
  • ✅ Validation layers: Comprehensive IP and hostname validation with clear messages
  • ✅ Warning system: Non-fatal issues reported gracefully without stopping parsing
  • ✅ Format intelligence: Automatic detection and preservation of original formatting style

What's Left to Build

🎨 Basic TUI (Phase 2 - Current Priority)

• Main Bubble Tea model: Core application state and structure
• Two-pane layout: Left list + right detail view
• Entry list display: Show IP and hostname columns
• Entry selection: Navigate and select entries with keyboard
• View mode: Safe browsing with status bar and active/inactive indicators
• Integration: Connect TUI with existing parser functionality

🔧 Edit Functionality (Phase 3)

• Edit mode transition: Explicit mode switching with visual indicators
• Permission handling: Request sudo access when entering edit mode
• Entry modification: Add, edit, delete, toggle active status
• File writing: Atomic updates with backup and rollback
• Input validation: Real-time validation of IP and hostname inputs

🌐 Advanced Features (Phase 4)

• DNS resolution: Background hostname to IP resolution
• IP comparison: Compare resolved vs current IP addresses
• Entry reordering: Manual drag/drop or move commands
• Sorting options: Sort by IP, hostname, or custom order
• Search/filter: Find entries quickly in large files

🧪 Testing & Quality (Ongoing)

• TUI tests: User interactions, state transitions
• Integration tests: Complete TUI workflows with file operations
• Permission tests: sudo scenarios, graceful degradation
• End-to-end tests: Full application workflows

Current Status

Project Phase: Phase 1 Complete → Phase 2 (TUI Implementation)

• Completion: ~65% (foundation and complete core parser functionality implemented)
• Active work: Ready to implement Bubble Tea TUI with two-pane layout (Phase 2)
• Blockers: None - comprehensive parser foundation with 54 tests completed
• Parser status: Production-ready with all safety features implemented

Development Readiness

• ✅ Architecture designed: Clear technical approach documented
• ✅ Requirements defined: User experience and functionality specified
• ✅ Technology selected: Bubble Tea stack confirmed and installed
• ✅ Testing strategy: TDD approach implemented and proven
• ✅ Project scaffolding: Complete Go module with all dependencies
• ✅ Development environment: Fully functional with comprehensive tests
• ✅ Parser foundation: Robust, tested, and production-ready

Risk Assessment

• Low risk: Well-established technology stack (Go + Bubble Tea)
• Low risk: Core parsing functionality (thoroughly tested and working)
• Medium risk: TUI complexity with two-pane layout
• Medium risk: Permission handling complexity (sudo integration)
• Low risk: TUI responsiveness (parser handles large files efficiently)

Known Issues

Technical Challenges

• Permission elevation: Need to handle sudo gracefully across platforms
• File locking: Prevent concurrent modifications to /etc/hosts
• Large file performance: Ensure responsiveness with large hosts files
• Terminal compatibility: Test across different terminal applications

Implementation Decisions Needed

• Configuration storage: Where to store user preferences and settings
• Backup strategy: How many backups to keep and where to store them
• DNS timeout handling: How to handle slow or unresponsive DNS queries
• Error recovery: How to handle corrupted hosts files or write failures

Evolution of Project Decisions

Initial Scope

• Started with comprehensive feature set including DNS resolution
• Planned for cross-platform compatibility from day one
• Emphasized safety and validation throughout

Refined Approach

• TDD emphasis: Write tests first to ensure reliability
• Incremental development: Build core functionality before advanced features
• Safety first: Default to read-only mode, explicit edit mode transition
• User experience focus: Two-pane interface for efficiency

Technology Evolution

• Framework choice: Bubble Tea selected for maturity and documentation
• Architecture pattern: MVU pattern from Bubble Tea ecosystem
• Testing approach: Comprehensive coverage with mocked dependencies
• Development workflow: Standard Go tooling with additional quality tools

Success Metrics & Milestones

Milestone 1: Basic Functionality (Target: Week 1)

• Parse and display existing hosts file entries
• Navigate entries with keyboard
• View entry details in right pane
• Success criteria: Can safely browse hosts file without editing

Milestone 2: Core Editing (Target: Week 2)

• Toggle entries active/inactive
• Add new entries with validation
• Edit existing entries
• Success criteria: Can perform basic hosts file modifications safely

Milestone 3: Advanced Features (Target: Week 3)

• DNS resolution and IP updates
• Entry reordering and sorting
• Search and filtering
• Success criteria: Full feature parity with manual editing plus enhancements

Milestone 4: Polish & Release (Target: Week 4)

• Comprehensive testing and bug fixes
• Documentation and usage examples
• Cross-platform testing and compatibility
• Success criteria: Production-ready tool suitable for daily use

Next Immediate Actions

✅ COMPLETED Phase 1 Tasks

1. ✅ Initialize Go project (go mod init hosts-go)
2. ✅ Add core dependencies (Bubble Tea, Bubbles, Lip Gloss, testify)
3. ✅ Create directory structure according to projectbrief.md
4. ✅ Create core data models with comprehensive validation (internal/core/models.go)
5. ✅ Implement foundation test suite (44 model tests, 100% passing)
6. ✅ Create demo application proving foundation works (cmd/hosts/main.go)
7. ✅ Write comprehensive parser tests (54 total tests covering all scenarios)
8. ✅ Implement hosts file parser (internal/core/parser.go - complete implementation)
9. ✅ Add intelligent formatting system with GCD-based spacing detection
10. ✅ Implement safe file operations with backup and atomic writes
11. ✅ Handle edge cases (malformed entries, various formats, error recovery)
12. ✅ Test round-trip parsing (parse → format → parse consistency verified)
13. ✅ Update demo application showcasing all parser functionality with realistic examples
14. ✅ Implement search functionality (FindEntry method for hostname/alias lookup)
15. ✅ Add format style detection (automatic tab vs space detection with column widths)
16. ✅ Create backup system (timestamped backups in ~/.config/hosts-go/)
17. ✅ Validate all parser features (IPv4, IPv6, aliases, comments, disabled entries)
18. ✅ Test warning system (malformed lines handled gracefully)
19. ✅ Verify atomic operations (temp files with rollback for safe writes)
20. ✅ Complete parser documentation (comprehensive demo showing all capabilities)

🚧 NEXT Phase 2 Actions (TUI Implementation)

1. Design TUI architecture following Bubble Tea MVU pattern
2. Create main application model with state management
3. Implement two-pane layout (entry list + detail view)
4. Add navigation controls (keyboard-driven interaction)
5. Integrate parser functionality with TUI display
6. Implement view mode (safe browsing without modifications)

Phase 1 is fully complete with a production-ready parser foundation.

Parser Achievement Summary

• 54 comprehensive tests covering all hosts file variations and edge cases
• Real-world validation with complex hosts file examples including IPv4, IPv6, aliases, comments
• Intelligent formatting that preserves user style while improving alignment
• Complete safety system with backups, atomic writes, and graceful error handling
• Search and management capabilities for finding and manipulating entries
• Demo application showcasing all functionality with realistic examples

The foundation is robust, tested, and ready for TUI implementation in Phase 2.