vim: run some code every time a buffer changes

Question

I want to trap all events that modify the vim buffer, so I can record them and send them to a server. I want to trap character-by-character events while in insert mode, and also be notified when p or dd etc. commands are executed---any time the document changes.

Answer 1

In Vim 8 this is much easier. Just listen to these to autocmd events:

TextChanged
TextChangedI