git symbolic-ref --delete $symref

Teach symbolic-ref to delete symrefs by adding the -d/--delete option to
git-symbolic-ref. Both proper and dangling symrefs are deleted by this
option, but other refs - or anything else that is not a symref - is not.

The symref deletion is performed by first verifying that we are given a
proper symref, and then invoking delete_ref() on it with the REF_NODEREF
flag.

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 23 insertions, 10 deletions

diff --git a/builtin/symbolic-ref.c b/builtin/symbolic-ref.c
index 9e92828b3a..f481959421 100644
--- a/builtin/symbolic-ref.c
+++ b/builtin/symbolic-ref.c
@@ -5,12 +5,11 @@
 
 static const char * const git_symbolic_ref_usage[] = {
 	N_("git symbolic-ref [options] name [ref]"),
+	N_("git symbolic-ref -d [-q] name"),
 	NULL
 };
 
-static int shorten;
-
-static void check_symref(const char *HEAD, int quiet)
+static int check_symref(const char *HEAD, int quiet, int shorten, int print)
 {
 	unsigned char sha1[20];
 	int flag;
@@ -22,20 +21,24 @@ static void check_symref(const char *HEAD, int quiet)
 		if (!quiet)
 			die("ref %s is not a symbolic ref", HEAD);
 		else
-			exit(1);
+			return 1;
+	}
+	if (print) {
+		if (shorten)
+			refname = shorten_unambiguous_ref(refname, 0);
+		puts(refname);
 	}
-	if (shorten)
-		refname = shorten_unambiguous_ref(refname, 0);
-	puts(refname);
+	return 0;
 }
 
 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
 {
-	int quiet = 0;
+	int quiet = 0, delete = 0, shorten = 0, ret = 0;
 	const char *msg = NULL;
 	struct option options[] = {
 		OPT__QUIET(&quiet,
 			N_("suppress error message for non-symbolic (detached) refs")),
+		OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
 		OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
 		OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
 		OPT_END(),
@@ -46,9 +49,19 @@ int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
 			     git_symbolic_ref_usage, 0);
 	if (msg &&!*msg)
 		die("Refusing to perform update with empty message");
+
+	if (delete) {
+		if (argc != 1)
+			usage_with_options(git_symbolic_ref_usage, options);
+		ret = check_symref(argv[0], 1, 0, 0);
+		if (ret)
+			die("Cannot delete %s, not a symbolic ref", argv[0]);
+		return delete_ref(argv[0], NULL, REF_NODEREF);
+	}
+
 	switch (argc) {
 	case 1:
-		check_symref(argv[0], quiet);
+		ret = check_symref(argv[0], quiet, shorten, 1);
 		break;
 	case 2:
 		if (!strcmp(argv[0], "HEAD") &&
@@ -59,5 +72,5 @@ int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
 	default:
 		usage_with_options(git_symbolic_ref_usage, options);
 	}
-	return 0;
+	return ret;
 }