Is there a mode out there for COMMIT_EDITMSG and the Git commit edit
message buffer in general?
I've seen some bindings for it bind it to diff-mode, just for the
comment highlighting presumably.
It would be really neat to have a mode that:
* Starts highlighting the first line yellow/red if it goes past
50/60 characters (configurable).
* Whines in a similar manner if the second line isn't empty.
* turns on auto-fill-mode for any text in the rest of the message as
long as it isn't indented.
*hint* :)
