name-ref: factor out name shortening logic from name_ref()

The logic will be used in a new codepath for showing exact matches.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/name-rev.c b/builtin/name-rev.c
index 87d485496fd5556cbd0f24793ed7e48f11e9b292..1234ebb5d8ff3fb194b9d20f5497d5bfaeb6b5a8 100644 (file)
--- a/builtin/name-rev.c
+++ b/builtin/name-rev.c
@@ -96,6 +96,17 @@ static int subpath_matches(const char *path, const char *filter)
        return -1;
 }
 
+static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
+{
+       if (shorten_unambiguous)
+               refname = shorten_unambiguous_ref(refname, 0);
+       else if (!prefixcmp(refname, "refs/heads/"))
+               refname = refname + 11;
+       else if (!prefixcmp(refname, "refs/"))
+               refname = refname + 5;
+       return refname;
+}
+
 struct name_ref_data {
        int tags_only;
        int name_only;
@@ -134,13 +145,7 @@ static int name_ref(const char *path, const unsigned char *sha1, int flags, void
        if (o && o->type == OBJ_COMMIT) {
                struct commit *commit = (struct commit *)o;
 
-               if (can_abbreviate_output)
-                       path = shorten_unambiguous_ref(path, 0);
-               else if (!prefixcmp(path, "refs/heads/"))
-                       path = path + 11;
-               else if (!prefixcmp(path, "refs/"))
-                       path = path + 5;
-
+               path = name_ref_abbrev(path, can_abbreviate_output);
                name_rev(commit, xstrdup(path), 0, 0, deref);
        }
        return 0;