medit is a programming and around-programming text editor.  Originally
started as a simple built-in editor component in GGAP, it grew up to a
real text editor.  It features:

  - Configurable syntax highlighting
  - Configurable keyboard accelerators
  - Plugins that can be written in C, Python, or Lua
  - Configurable tools available from the main and context menus;
    can be written in Python or Lua, or be a shell script
  - Regular expression search/replace, grep(1) frontend, built-in
    file selector, etc.

WWW: http://mooedit.sourceforge.net/