ref-filter: provide a function for parsing sort options

The ref-filter module currently provides a callback suitable
for parsing command-line --sort options. But since git-tag
also supports the tag.sort config option, it needs a
function whose implementation is quite similar, but with a
slightly different interface. The end result is that
builtin/tag.c has a copy-paste of parse_opt_ref_sorting().

Instead, let's provide a function to parse an arbitrary
sort string, which we can then trivially wrap to make the
parse_opt variant.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/ref-filter.c b/ref-filter.c
index 178396e1f3..4321212197 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2126,15 +2126,11 @@ struct ref_sorting *ref_default_sorting(void)
 	return sorting;
 }
 
-int parse_opt_ref_sorting(const struct option *opt, const char *arg, int unset)
+void parse_ref_sorting(struct ref_sorting **sorting_tail, const char *arg)
 {
-	struct ref_sorting **sorting_tail = opt->value;
 	struct ref_sorting *s;
 	int len;
 
-	if (!arg) /* should --no-sort void the list ? */
-		return -1;
-
 	s = xcalloc(1, sizeof(*s));
 	s->next = *sorting_tail;
 	*sorting_tail = s;
@@ -2148,6 +2144,13 @@ int parse_opt_ref_sorting(const struct option *opt, const char *arg, int unset)
 		s->version = 1;
 	len = strlen(arg);
 	s->atom = parse_ref_filter_atom(arg, arg+len);
+}
+
+int parse_opt_ref_sorting(const struct option *opt, const char *arg, int unset)
+{
+	if (!arg) /* should --no-sort void the list ? */
+		return -1;
+	parse_ref_sorting(opt->value, arg);
 	return 0;
 }