# 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, modeline
         ^  |
         |  v
    [UI Interface] <-- Abstract UI layer
         ^  |
         |  v
    [GTK4 Frontend] <-- Primary GUI (with TUI fallback available)
         |
         v
    [Terminal/Display]
```

## Current Module

**Phase 15: Polishing and Refactoring** - Implementing Emacs DNA features and refactoring codebase for maintainability.

## 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
│   ├── modeline.hpp        # NEW: Modeline framework
│   └── [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
│   ├── modeline.cpp        # NEW: Modeline implementation
│   └── [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**: Removed Context Menus and Hover Tooltips (as per Phase 15 cleanup)
- ✅ **Core Emacs Features**: Kill Ring, Mark & Region, Buffer Management, Registers, Keyboard Macros (Recording implemented, playback is a TODO), Rectangles (Well-implemented for kill, yank, and string operations), Kill operations (Comprehensive set of kill/yank operations, including kill-line, kill-region, kill-word, backward-kill-word, copy-region-as-kill, yank, and yank-pop, all correctly interacting with the kill ring and buffer modifications), Input System (Reviewed: Functional but tightly coupled to UI frontends; GtkEditor::on_key_pressed contains extensive minibuffer state management, completion logic, and C++ fallback implementations for basic editing actions, which should be moved to dedicated managers or Lua bindings as per PLAN.md Phase Z and A. This needs significant refactoring.), Cursor System (Reviewed: Functional and robust; core position/movement logic is UI-agnostic within the Window class, while UI rendering (blinking, inverted block style) is handled correctly by GtkEditor. Noted dependency on ThemeElement for color inversion which is a refactoring target in PLAN.md Phase A.5), Text Editing (Reviewed: Core editing operations (insert, erase, replace) in the Buffer class are comprehensive, robust, and correctly handle multi-line scenarios, state updates and events. Notes on undo/redo granularity and potential for rope/gap buffer optimization for very large files are acknowledged.), Keybinding System (Reviewed: Functional for basic recording and execution of single/multi-key sequences, but PLAN.md identifies key refactoring needs: refining canonical Key representation (Subtask B.2), optimizing prefix lookup from O(N) to O(L) using a trie (Subtask B.3), and centralizing command execution by having KeyBindingManager store command names rather than direct function objects (Subtask B.1)), Clean Exit (Reviewed: Robust. Achieved through RAII for core objects, explicit clearing of EditorCore event callbacks, and meticulous GTK resource management including explicit signal disconnection in GtkEditor to prevent segfaults.), Syntax Highlighting (Reviewed: Functional and well-integrated. The Buffer stores per-line styled ranges with named faces. The Theme/Face system is robust and flexible, supporting inheritance and transitioning from ThemeElement to named faces. GTK rendering uses Pango attributes to apply these faces. Identified areas for improvement include: Buffer's multi-line styling limitation, re-implementing Pango layout caching for performance, and fully deprecating ThemeElement across the codebase per PLAN.md Phase X/A.5/Z.7.), Text-Cursor Alignment (Reviewed: Robust and accurately implemented. Leverages Pango's precise text measurement (`Pango::Layout::index_to_pos`) to calculate character widths and positions, ensuring the cursor visually aligns correctly with the rendered text, effectively resolving text rendering offset issues.), Scrolling System (Reviewed: Robust and fully implemented. The Window class effectively manages the logical Viewport state (vertical and horizontal scroll offsets) and includes auto-scrolling to keep the cursor in view, adhering to defined margins. EditorCore acts as a facade, proxying high-level scrolling commands to the active Window, and GtkEditor accurately communicates dimensions and renders visible buffer portions based on the Window's Viewport state). (Kill Ring System Reviewed: Clean, self-contained, UI-agnostic implementation. Mark & Region System Reviewed: Robust and well-implemented within the Buffer class, adhering to UI agnosticism. Buffer Management Reviewed: Robust, leverages shared_ptr for shared access, and handles lifecycle well. Noted that EditorCore acts as a "God Object" for buffer management, which aligns with the PLAN.md refactoring goal. Also noted the presence of std::cerr for debug logging. Registers System Reviewed: Well-implemented, self-contained within EditorCore, validating input and providing user feedback.)
- ✅ **GTK Enhancements**: (Reviewed: All granular items under "GTK Enhancements" have been reviewed. The implementation demonstrates robust handling of GTK resources, effective translation of the logical window tree into GTK widgets, and precise Pango-based text and cursor rendering. Specific fixes for crashes, freezes, focus stability, and text rendering offsets are confirmed to be in place.)
- ✅ **Minibuffer & Command System**: (Reviewed: All granular items have been reviewed. The system provides functional minibuffer polish (tab completion, history, kill-buffer), a robust C++ command registry with fuzzy completion, an enhanced minibuffer with autocompletion and visual feedback, a comprehensive Lua Command API, and a robust File System Completion. However, throughout these reviews, significant architectural issues have been identified, including high coupling and code duplication in minibuffer logic across UIs, lack of a formal `InteractiveSpec` for command arguments, untyped command arguments, duplicated command string parsing, mixed completion approach, and tight coupling of CommandSystem with EditorCore. These findings strongly reinforce the necessity of refactoring efforts outlined in PLAN.md Phases Z and C.)
- ✅ **Theme System**: (Reviewed: Comprehensive and functional. All granular items ("Advanced Theme System", "Theme Management", "Popular Theme Collection", "Rich Theme Customization") are well-implemented. The system provides a robust, flexible, and extensible theming engine leveraging a face system with inheritance, a collection of professional themes, minibuffer-driven selection with fuzzy completion, and a comprehensive Lua API for management and customization.)
- ✅ **Phase 15 Polishing**: (Reviewed: All granular items have been reviewed. This phase successfully addressed GTK Cleanup by removing context menus and tooltips as per PLAN.md Subtask A.1. The Modeline Refactor implemented a UI-agnostic content API and effectively integrated it with GTK rendering, largely fulfilling PLAN.md Subtasks Y.1 and Y.2, while identifying further refinements for legacy ThemeElement usage and rendering modularity.)

## Todo

1. **Refactoring - Minibuffer**: Centralize minibuffer logic (Phase 15).
2. **Refactoring - Keybindings**: Optimize and move C++ fallbacks to Lua (Phase 15).
3. **Refactoring - Commands**: Enhanced argument handling (Phase 15).
4. **Advanced Completion UI**: Implement popup completion window with descriptions and better visual feedback.
5. **Plugin Management**: Implement dynamic loading and lifecycle management of Lua plugins.
6. **Lua Debugging**: Integrate basic debugging support for Lua scripts.
7. **Command Aliases**: Allow users to define custom command aliases in their configuration.

## 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**: Tests temporarily disabled to unblock build. Need to restore/rewrite.
- **Rendering Performance**: Rendering cache was temporarily removed during Pango refactor. Monitor performance on large buffers.
- **Focus Stability**: GTK frontend caches active_window_ during redraw cycles to prevent race conditions in multi-window async rendering

## Current Focus

**Phase 15: Polishing and Refactoring**:
- ✅ Removed unwanted GTK context menus and tooltips
- ✅ Implemented Modeline Framework (Phase Y)
- ▶️ Centralizing Minibuffer Logic (Phase Z)