[PATCH] git-describe: Add a --match option to limit considered tags.

[Pierre Habouzit <madcoder@debian.org>]

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
---
 Documentation/git-describe.txt |    4 ++++
 builtin-describe.c             |   11 ++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
index ac23e28..cb869e9 100644
--- a/Documentation/git-describe.txt
+++ b/Documentation/git-describe.txt
@@ -51,6 +51,10 @@ OPTIONS
 	being employed to standard error.  The tag name will still
 	be printed to standard out.
 
+--match <pattern>::
+        Only consider tags matching the given pattern (can be used to avoid
+        leaking private tags made from the repository).
+
 EXAMPLES
 --------
 
diff --git a/builtin-describe.c b/builtin-describe.c
index 7a148a2..982a355 100644
--- a/builtin-describe.c
+++ b/builtin-describe.c
@@ -19,6 +19,7 @@ static int all;	/* Default to annotated tags only */
 static int tags;	/* But allow any tags if --tags is specified */
 static int abbrev = DEFAULT_ABBREV;
 static int max_candidates = 10;
+const char *pattern = NULL;
 
 struct commit_name {
 	int prio; /* annotated tag = 2, tag = 1, head = 0 */
@@ -57,9 +58,11 @@ static int get_name(const char *path, const unsigned char *sha1, int flag, void
 	 * Otherwise only annotated tags are used.
 	 */
 	if (!prefixcmp(path, "refs/tags/")) {
-		if (object->type == OBJ_TAG)
+		if (object->type == OBJ_TAG) {
 			prio = 2;
-		else
+			if (pattern && fnmatch(pattern, path + 10, 0))
+				prio = 0;
+		} else
 			prio = 1;
 	}
 	else
@@ -253,7 +256,9 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
 		OPT_BOOLEAN(0, "tags",       &tags, "use any tag in .git/refs/tags"),
 		OPT__ABBREV(&abbrev),
 		OPT_INTEGER(0, "candidates", &max_candidates,
-					"consider <n> most recent tags (default: 10)"),
+		            "consider <n> most recent tags (default: 10)"),
+		OPT_STRING(0, "match",       &pattern, "pattern",
+		           "only consider tags matching <pattern>"),
 		OPT_END(),
 	};
 
-- 
1.5.4.rc1.1096.gde4c4-dirty