Lumacs/CONTINUATION_PROMPT.md

Lumacs Development Continuation Prompt

Copy this entire prompt to start a new conversation and continue development:

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I'm working on Lumacs, an Emacs-inspired text editor written in C++20 with ncurses, GTK4, and Lua scripting. The project is located at /Users/user/Projects/lumacs.

Current Status

Phase 6: GTK4 Frontend - PROTOTYPE WORKING

• Build: Successful, single binary lumacs.
• GTK4 Frontend:
  • Default mode.
  • Renders text using Pango/Cairo with syntax highlighting.
  • Handles keyboard input with modifiers.
  • Known Issue: Crashes on exit (double free).
• TUI Frontend: Available via -nw flag.
• Lua API: Stable and fully integrated.

Recent Accomplishments

1. GTK4 Integration

• Implemented GtkEditor class (src/gtk_editor.cpp).
• Configured CMakeLists.txt to optionally build with gtkmm-4.0.
• Implemented key mapping from GDK events to Lumacs key strings.
• Implemented text rendering with Pango Font Metrics.

2. Face System

• Lua API for define_face and inheritance works.
• Themes (Everforest, Dracula) work in both TUI and GUI.

Next Steps

Priority 1: Fix Crash on Exit

• Investigate Gtk::Application and Window lifetime management in src/gtk_editor.cpp.

Priority 2: Scrolling & Viewport

• Implement scrolling logic in GtkEditor::on_draw (currently text is just drawn from (0,0)).
• Handle horizontal scrolling or wrapping.

Priority 3: UI Polish

• Implement Mode Line in GTK (currently only text area is drawn).
• Implement Minibuffer in GTK.

Testing Instructions

Build:

./scripts/build.sh

Run GUI:

./build/lumacs

Run TUI:

./build/lumacs -nw

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GTK4 Frontend is interactive! Text and Cursor are visible. Input works.