Re: [PATCH] log: add %S option (like --source) to log --format

[Issac Trotts <issac.trotts@gmail.com>]

On Tue, Dec 18, 2018 at 9:14 AM Issac Trotts <issac.trotts@gmail.com> wrote:
>
> Hi Peff, thanks for the feedback. I tried a variant of the command you
> showed and it yielded a seg fault:
> ```
> [ issactrotts ~/git ] ./git diff-tree -s --pretty=tformat:'%S %H %s' HEAD
> Segmentation fault: 11
> ```
> I'll see if I can track it down this evening.

Okay, found it. My solution is to make %S not do anything for commands
other than `log` since `log` is the only one that has --source defined
as far as I can tell.

I'm waiting for Travis to run and will post an updated patch if
everything looks good there.

> Issac
>
> On Mon, Dec 17, 2018 at 7:59 AM Jeff King <peff@peff.net> wrote:
> >
> > On Sun, Dec 16, 2018 at 10:25:14PM -0800, Issac Trotts wrote:
> >
> > > Make it possible to write for example
> > >
> > >         git log --format="%H,%S"
> > >
> > > where the %S at the end is a new placeholder that prints out the ref
> > > (tag/branch) for each commit.
> >
> > Seems like a reasonable thing to want.
> >
> > One curious thing about "--source" is that it requires cooperation from
> > the actual traversal. So if you did:
> >
> >   git rev-list | git diff-tree --format="%H %S"
> >
> > we don't have the %S information in the latter command. I think that's
> > probably acceptable as long as it does something sane when we don't have
> > that information (e.g., replace it with an empty string). It might also
> > be worth calling out in the documentation.
> >
> > -Peff