Anything that can be shared or tested individually gets moved to a library, no matter how small. I'll have an 'ed' library for things like the gap buffer and u

Anything that can be shared or tested individually gets moved to a library, no matter how small. I'll have an 'ed' library for things like the gap buffer and undo/redo aware buffer (built on gap) as well as the movement logic and stuff like that. The "editor" will only handle default bindings, the action/draw/paint cycle and an action event loop. These are core to the specific application so they belong to be coupled to it.