DEV_STATE.md - Lumacs Development State

Architecture

    [Lua 5.4 Engine]
         ^  |
         |  v
    [Lua API Bridge] <-- C++ bindings for buffers, windows, keybindings, themes
         ^  |
         |  v
    [Editor Core] <-- Buffer management, kill ring, face system
         ^  |
         |  v
    [UI Interface] <-- Abstract UI layer
         ^  |
         |  v
    [GTK4 Frontend] <-- Primary GUI (with TUI fallback available)
         |
         v
    [Terminal/Display]

Current Module

GTK4 Frontend Completion - Currently in Phase 6 with stable basic functionality. The editor has working text input, cursor movement, basic editing operations, and clean shutdown.

File Manifest

Lumacs/
├── CMakeLists.txt           # Build configuration
├── init.lua                 # Main Lua initialization
├── themes.lua              # Theme definitions
├── include/lumacs/         # C++ headers
│   ├── editor_core.hpp     # Core editor logic
│   ├── buffer.hpp          # Text buffer management
│   ├── lua_api.hpp         # C++/Lua bridge
│   ├── gtk_editor.hpp      # GTK4 frontend
│   ├── tui_editor.hpp      # TUI fallback
│   ├── keybinding.hpp      # Key handling
│   ├── theme.hpp           # Theme/face system
│   └── [other headers]
├── src/                    # C++ implementation
│   ├── main.cpp            # Entry point
│   ├── editor_core.cpp     # Core functionality
│   ├── lua_api.cpp         # Lua bindings
│   ├── gtk_editor.cpp      # GTK implementation
│   └── [other .cpp files]
├── tests/                  # Unit tests
├── examples/               # Test files and demos
├── scripts/                # Build/test scripts
└── documentation/          # Project docs

Done

✅ Phase 1-5: Complete Emacs-like core functionality
✅ Phase 6 Core: GTK4 frontend with text rendering
✅ Input System: Full keyboard input with modifiers working
✅ Cursor System: Emacs-style blinking block cursor with color inversion
✅ Text Editing: Basic insertion, deletion, movement operations working
✅ Keybinding System: Fixed conflicts, C-n, C-p, C-f, C-b, C-a, C-e, C-s, C-k working
✅ Clean Exit: Fixed shutdown crashes and memory issues
✅ Syntax Highlighting: Face system with Pango rendering
✅ Text-Cursor Alignment: Fixed text rendering offset issues
✅ Scrolling System: Full vertical and horizontal scrolling with Page Up/Down support
✅ Kill Ring System: Complete implementation with push/yank/yank-pop operations
✅ Mark & Region: Full mark/region system in Buffer (set_mark, deactivate_mark, get_region)
✅ Buffer Management: Complete buffer switching, listing, and management in EditorCore
✅ Core Emacs Features: Registers, keyboard macros, rectangles, kill operations
✅ GTK Segfault Fix: Resolved double-free on exit with proper cleanup handling
✅ GTK Window Splits: Dynamic container layout with Gtk::Paned matching EditorCore's window tree
✅ Window Split Crash Fix: Resolved window split crashes and text rendering issues
✅ Multi-Window Text Rendering: Fixed text rendering in split windows with proper font metrics
✅ Split Window UI Polish: Fixed modeline display, focus stability, and split ratio calculations

Todo

Phase 7: Performance optimization and tuning
Phase 8: Mouse support and advanced UI features
Window Focusing API: Add proper set_active_window method to EditorCore instead of cycling through next_window

Technical Debt/Notes

Lua Bridge: The lua_api.cpp contains the critical C++/Lua boundary code
GTK Threading: All GTK operations must stay on main thread
Memory Management: Using RAII and smart pointers throughout C++ code
Face System: Themes are fully integrated with Pango text rendering
Cursor Implementation: Blinking timer with 500ms intervals, proper cleanup on exit
Scrolling Architecture: Viewport system with 3-line vertical and 5-column horizontal margins
Build System: CMake-based with proper dependency management
Testing: Unit test framework in place for core components

Current Focus

Phase 6 GTK4 Frontend - FULLY COMPLETED: All functionality implemented including:

Text rendering with syntax highlighting
Full keyboard input and cursor management
Window splitting with dynamic GTK containers
Clean exit without segfaults
Ready for Phase 7 performance optimization

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