Hi Jeff,
On Mon, Apr 22, 2019 at 02:18:36PM -0400, Jeff Hostetler wrote:
>
>
> On 4/22/2019 1:07 AM, Denton Liu wrote:
> >In git-difftool.txt, it says
> >
> > 'git difftool' falls back to 'git mergetool' config variables when the
> > difftool equivalents have not been defined.
> >
> >However, when `diff.guitool` is missing, it doesn't fallback to
> >anything. Make git-difftool fallback to `merge.guitool` when `diff.guitool`
> >is
> >missing.
> >
>
> Is this a well-defined operation?
I believe this is a yes.
>
> I mean, we're assuming here that a 3-way gui merge tool (that probably
> expects 3 input pathnames and maybe a 4th merge-result pathname (and
> associated titles and etc)) can function sanely when only given the
> pair that a diff would have.
>
> That is, we're assuming that the selected merge tool has a 2-way diff
> mode and that the command line args for the 2- and 3-way views are
> compatible.
If I read the code correctly, it seems like the only tool that is
strictly "merge-only" is tortoisemerge. In mergetools/tortoisemerge, we
have
can_diff () {
return 1
}
which means it will refuse to run as a difftool.
In the case where it fails like this, it'll loudly complain to the user,
which'll give them a chance to fix their config. I believe that this is
desired behaviour and the patch adds on top of that.
Thanks,
Denton
>
> Just a thought
> Jeff
>
>
