Undo for "vi"

[Jody Bruchon]

On 3/18/2014 10:51 AM, Jody Bruchon wrote:
> Out of an interest in seeing this feature, I'm looking at vi.c

I've started implementing the "undo" function; it looks to be easier 
than I expected now that I have a feel for the way the buffer is handled 
and should add very little actual code (though obviously it will 
increase dynamic memory usage due to storing undo data somewhere.) If I 
manage to produce a working undo command, I'll send in a patch for 
Should I make the number of undo levels a tunable option via Kconfig? 
Perhaps via an unlimited option (just keep allocating undo data until 
OOM) and a limited one that allows a maximum number of undo levels to be 
set?

-Jody