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

Phase 12: Enhanced Minibuffer & Command System - Comprehensive command execution, autocompletion, and Lua API integration.

File Manifest

Lumacs/
├── CMakeLists.txt           # Build configuration
├── init.lua                 # Main Lua initialization
├── themes.lua              # Theme definitions
├── include/lumacs/
│   ├── 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
│   ├── command_system.hpp  # Command registry & completion engine
│   └── [other headers]
├── src/
│   ├── main.cpp            # Entry point
│   ├── editor_core.cpp     # Core functionality
│   ├── lua_api.cpp         # Lua bindings
│   ├── gtk_editor.cpp      # GTK implementation
│   ├── command_system.cpp  # Command execution & completion
│   └── [other .cpp files]
├── tests/
├── examples/
├── scripts/
└── documentation/

Done

✅ Phase 1-5: Complete Emacs-like core functionality
✅ Phase 6 Core: GTK4 frontend with text rendering
✅ Phase 7 Optimization: Render caching and performance tuning
✅ Phase 8 Mouse: Full mouse support (click-move, scroll, drag-select)
✅ Phase 9 Advanced UI: Implemented Context Menus (right-click) and Hover Tooltips
✅ 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
✅ Window Split Freeze Fix: Resolved GTK signal_realize callback issues causing freezes during splits
✅ Split Window Cursor Fix: Fixed cursor movement to work in focused window rather than original active window
✅ Focus Jumping Fix: Fixed window focus jumping during rapid typing by caching active_window during async redraws
✅ Split Ratio Improvement: Implemented initial split ratio using signal_map with fallback
✅ Modeline: Implemented detailed Emacs-like modeline with active/inactive states, flags, percentage, and mode display
✅ Minibuffer Polish: Implemented Tab completion (buffers/files), command history (up/down), and kill-buffer logic
✅ GTK Text Rendering: Refactored to use Pango::AttrList for correct multi-font and styled text rendering.
✅ GTK Cursor: Fixed cursor positioning for variable width fonts using Pango layout metrics.
✅ GTK Region: Implemented visual highlighting for selected regions (mark/point).
✅ Command System: Implemented comprehensive C++ command registry with fuzzy completion engine
✅ Enhanced Minibuffer: Improved command execution with autocompletion and visual feedback
✅ Lua Command API: Full Lua integration for command registration, execution, and custom completion providers
✅ File System Completion: C++ implementation for file path autocompletion in find-file operations
✅ Enhanced Command Set: Rich set of Emacs-like commands including buffer management, text manipulation, and development tools
✅ Advanced Theme System: 6 professional themes with minibuffer selection, fuzzy completion, and comprehensive Lua API
✅ Theme Management: Full theme switching interface with M-x set-theme, theme cycling, random selection, and auto-theme based on time
✅ Popular Theme Collection: Solarized Dark, Nord, Gruvbox Light, Dracula, Everforest Dark, and enhanced Default themes
✅ Rich Theme Customization: Extended ThemeElement enum for comprehensive UI theming including minibuffer, status line, and text elements

Todo

Advanced Completion UI: Implement popup completion window with descriptions and better visual feedback.
Plugin Management: Implement dynamic loading and lifecycle management of Lua plugins.
Lua Debugging: Integrate basic debugging support for Lua scripts.
Command Aliases: Allow users to define custom command aliases in their configuration.
Completion Providers: Add more completion providers (symbols, recently used files, history, etc.).

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
Rendering Performance: Rendering cache was temporarily removed during Pango refactor. Monitor performance on large buffers.
Focus Stability: GTK frontend caches activewindow during redraw cycles to prevent race conditions in multi-window async rendering

Current Focus

Phase 14: Bug Fixes and Stability Improvements:

✅ Fixed critical window focus jumping bug during rapid typing in split windows
✅ Re-enabled next_window() function (C-x o) for proper window cycling
✅ Improved rendering stability with cached active window state

Previous Phase - Phase 13: Advanced Theme System Complete:

✅ Enhanced theme management with minibuffer selection
✅ 6 built-in themes (Solarized, Nord, Gruvbox, Dracula, Everforest, Default)
✅ Comprehensive theme commands and Lua API
✅ Rich UI customization system

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