Subject: Re: [PATCH v2] tag: support configuring --sort via .gitconfig

From: Junio C Hamano <[email-masked]>
Date: Thu, 10 Jul 2014 10:59:36 -0700

Jeff King <[email-masked]> writes:

> I know this is existing code you are moving, but I noticed it looks ripe
> for using skip_prefix. Perhaps while we are in the area we should do the
> following on top of your patch (I'd also be happy for it be squashed
> in, but that may be too much in one patch).

I am tempted to suggest going the other way around, i.e. queue (an
equivalent of) this on jk/skip-prefix and merge it to 'next' and
then 'master' quickly.

I can go either way, but I tend to prefer building new things on top
of obviously correct clean-up, not the other way around.

> -- >8 --
> Subject: [PATCH] tag: use skip_prefix instead of magic numbers
>
> We can make the parsing of the --sort parameter a bit more
> readable by having skip_prefix keep our pointer up to date.
>
> Signed-off-by: Jeff King <[email-masked]>

 builtin/tag.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/builtin/tag.c b/builtin/tag.c
index c6e8a71..1101c19 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -524,18 +524,14 @@ static int parse_opt_sort(const struct option *opt, const char *arg, int unset)
 	int *sort = opt->value;
 	int flags = 0;
 
-	if (*arg == '-') {
+	if (skip_prefix(arg, "-", &arg))
 		flags |= REVERSE_SORT;
-		arg++;
-	}
-	if (starts_with(arg, "version:")) {
-		*sort = VERCMP_SORT;
-		arg += 8;
-	} else if (starts_with(arg, "v:")) {
+
+	if (skip_prefix(arg, "version:", &arg) || skip_prefix(arg, "v:", &arg))
 		*sort = VERCMP_SORT;
-		arg += 2;
-	} else
+	else
 		*sort = STRCMP_SORT;
+
 	if (strcmp(arg, "refname"))
 		die(_("unsupported sort specification %s"), arg);
 	*sort |= flags;