Re: [RFC PATCH 3/4] range-diff: add section header instead of diff header

[Johannes Schindelin <Johannes.Schindelin@xxxxxx>]

Hi Eric,

On Sun, 14 Apr 2019, Eric Sunshine wrote:

> On Sun, Apr 14, 2019 at 5:10 PM Thomas Gummerer <t.gummerer@xxxxxxxxx> wrote:
> > [...]
> > Introduce a new range diff hunk header, that's enclosed by "##",
> > similar to how line numbers in diff hunks are enclosed by "@@", and
> > give human readable information of what exactly happened to the file,
> > including the file name.
> > [...]
> > Signed-off-by: Thomas Gummerer <t.gummerer@xxxxxxxxx>
> > ---
> > diff --git a/range-diff.c b/range-diff.c
> > @@ -90,8 +91,37 @@ static int read_patches(const char *range, struct string_list *list)
> > +               } else if (starts_with(line.buf, "--- ")) {
> > +                       if (!strcmp(line.buf, "--- /dev/null"))
> > +                               strbuf_remove(&line, 0, 4);
> > +                       else
> > +                               strbuf_remove(&line, 0, 6);
> > +                       strbuf_rtrim(&line);
> > +                       strbuf_reset(&filename_a);
> > +                       strbuf_addbuf(&filename_a, &line);
> > +               } else if (starts_with(line.buf, "+++ ")) {
>
> At this point, we know that line.buf starts with "+++"...
>
> > +                       strbuf_addstr(&buf, " ## ");
> > +                       if (!strcmp(line.buf, "--- /dev/null"))
>
> so, it seems unlikely that it's ever going to match "--- /dev/null".
>
> > +                               strbuf_remove(&line, 0, 4);
> > +                       if (!strcmp(filename_a.buf, "/dev/null")) {
> > +                               strbuf_addstr(&buf, "new file ");
> > +                               strbuf_addbuf(&buf, &line);
> > +                       } else if (!strcmp(line.buf, "/dev/null")) {
> > +                               strbuf_addstr(&buf, "removed file ");
> > +                               strbuf_addbuf(&buf, &line);
> > +                       } else if (strbuf_cmp(&filename_a, &line)) {
> > +                               strbuf_addstr(&buf, "renamed file ");
> > +                               strbuf_addbuf(&buf, &filename_a);
> > +                               strbuf_addstr(&buf, " -> ");
> > +                               strbuf_addbuf(&buf, &line);
> > +                       } else {
> > +                               strbuf_addstr(&buf, "modified file ");
> > +                               strbuf_addbuf(&buf, &line);
> > +                       }
>
> All of these disposition strings end with "file", which seems
> redundant. Short and sweet "new", "removed", "renamed", "modified"
> provide just as much useful information.
>
> Also, should these strings be localizable?

I'd rather not.

> Alternately, rather than using prose to describe the disposition,
> perhaps do so symbolically (thus universally), say with "+", "-", "->",
> "*" (or ""), respectively?

Or maybe streamline the common case (modified) by *not* saying anything,
then? I.e.

	@@ Documentation/Makefile

for a modified file,

	@@ builtin/psuh.c (new)

for a new file,

	@@ git-add--interactive.perl (deleted)

for a removed one, and

	@@ builtin/serve.c -> t/helper/test-serve-v2.c

for a renamed one.

That should also give us a bit of wiggle room to append the function name
part of the inner hunk header, if any.

Ciao,
Dscho