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

>
> issac.trotts@gmail.com writes:
>
> > From: Issac Trotts <issac.trotts@gmail.com>
>
> Heh, I'll edit this line to match S-o-b: below.

> > 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.
> >
> > Using %d might seem like an alternative but it only shows the ref for the last
> > commit in the branch.
> >
> > Signed-off-by: Issac Trotts <issactrotts@google.com>
> >
> > ---
>
>
>
> > diff --git a/log-tree.c b/log-tree.c
> > index 10680c139..3cb14256e 100644
> > --- a/log-tree.c
> > +++ b/log-tree.c
> > @@ -700,6 +700,7 @@ void show_log(struct rev_info *opt)
> >       ctx.color = opt->diffopt.use_color;
> >       ctx.expand_tabs_in_log = opt->expand_tabs_in_log;
> >       ctx.output_encoding = get_log_output_encoding();
> > +     ctx.rev = opt;
>
> There are quite a few existing codepaths that change their behaviour
> based on NULL-ness of ctx.rev field.  How would we make sure that
> this change have no unintended consequence, I wonder?
>
> > +     case 'S':               /* tag/branch like --source */
> > +             if (c->pretty_ctx->rev == NULL || c->pretty_ctx->rev->sources == NULL) {
> > +                     return 0;
> > +             }
> > +             slot = revision_sources_at(c->pretty_ctx->rev->sources, commit);
> > +             if (!(slot && *slot)) {
> > +                     return 0;
> > +             }
> > +             strbuf_addstr(sb, *slot);
> > +             return 1;
>
> Let's update the style of this hunk here like so:
>
>         if (!c->pretty_ctx->rev || !c->pretty_ctx->rev->sources)
>                 return 0;
>         slot = ...;
>         if (!(slot && *slot))
>                 return 0;
>         strbuf_addstr(...);
>         return 1;

>
> I wonder if it is even better to apply de-Morgan to one of the above
> two, i.e.
>
>         if (!(c->pretty_ctx->rev && c->pretty_ctx->rev->sources))
>                 return 0;
>