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

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: https://user-images.githubusercontent.com/3920290/80743752-731bd780-8b15-11ea-97d3-847db927c5dc.png https://user-images.githubusercontent.com/3920290/80743752-7... Or create their own custom "views": https://user-images.githubusercontent.com/3920290/81343656-49325a00-90ad-11ea-8647-ff39d8f1d730.gif 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.