Re: [RFC PATCH 2/4] range-diff: don't remove funcname from inner diff

[Thomas Gummerer <t.gummerer@gmail.com>]

On 04/15, Johannes Schindelin wrote:
> Hi Thomas,
> 
> 
> On Sun, 14 Apr 2019, Thomas Gummerer wrote:
> > diff --git a/range-diff.c b/range-diff.c
> > index 9242b8975f..f365141ade 100644
> > --- a/range-diff.c
> > +++ b/range-diff.c
> > @@ -102,9 +102,12 @@ static int read_patches(const char *range, struct string_list *list)
> >  				strbuf_addch(&buf, '\n');
> >  			}
> >  			continue;
> > -		} else if (starts_with(line.buf, "@@ "))
> > -			strbuf_addstr(&buf, "@@");
> > -		else if (!line.buf[0] || starts_with(line.buf, "index "))
> > +		} else if (starts_with(line.buf, "@@ ")) {
> > +			char *skip_lineno = strstr(line.buf + 3, "@@");
> 
> Rather than using the magic constant "3", it would probably make sense to
> declare `skip_lineno` outside of the `if` construct, and use
> `skip_prefix(line.buf, "@@ ", &skip_lineno)` instead of
> `starts_with(...)`.

I like this suggestion.

> We *will*, however, want to have a safeguard against `strstr()` not
> finding anything. Maybe re-use the `p` variable that we already have, and
> do this instead:
> 
> 		} else if (skip_prefix(line.buf, "@@ ", &p) &&
> 			   (p = strstr(p, "@@"))) {
> 
> > +			strbuf_remove(&line, 0, skip_lineno - line.buf);
> > +			strbuf_addch(&buf, ' ');
> 
> Shorter:
> 
> 			strbuf_splice(&line, 0, p - line.buf, " ", 1);
> 
> (assuming that you accept my suggestion to use `p` instead of
> `skip_lineno`...)

And this is also much nicer, thanks!

> Thanks,
> Dscho
> 
> > +			strbuf_addbuf(&buf, &line);
> > +		} else if (!line.buf[0] || starts_with(line.buf, "index "))
> >  			/*
> >  			 * A completely blank (not ' \n', which is context)
> >  			 * line is not valid in a diff.  We skip it
> > --
> > 2.21.0.593.g511ec345e1
> >
> >