Re: [RFC] undo and redo

> On Thu, Aug 25, 2005 at 01:19:05PM -0700, Junio C Hamano wrote:
> > "Kirby C. Bohling" <kbohling@birddog.com> writes:
>     Just out of curiosity, why isn't the SHA1 of 'A' part of the
> diff or patch format?  I mean it can't be that hard to add it as a
> single line of data that git can parse to extract that piece of
> information.  Then a patch would enable you to do the 3-way merge
> you describe.  If added properly "regular" patch would just ignore
> that line.  The patch would then record that it is relative to 'A'.

>     Assuming git could be taught "git-merge-patch" and then take use
> the patch that's saved during the "undo" step and has the anchor for
> the patch to use as the pivot point (as described above).  Life
> should be good.  There are probably corner cases I don't understand,
> but it sure looks like if you have the pivot or anchor point for the
> patch embedded in the patch, you have all the needed information to
> pull this off.
> 
>     I would think this would be generally useful outside of the
> context of "undo/redo" also.
> 
>     Kirby
> 
>