As the editor is written mostly in Lua, with C taking care of the lower level parts, plugins can typically customise anything limited to what is exposed by Lua and the C API. Beyond adding custom commands, plugins can also do things like patch straight in the DocView's line-drawing function to draw additional content:
The treeview at the left of the screen is implemented as a normal plugin, and like any other plugin can be removed from lite by simply deleteing the `treeview.lua` file.
https://user-images.githubusercontent.com/3920290/80743752-7...
Or create their own custom "views":
https://user-images.githubusercontent.com/3920290/81343656-4...
The treeview at the left of the screen is implemented as a normal plugin, and like any other plugin can be removed from lite by simply deleteing the `treeview.lua` file.