[PATCH 3/4] stash: convert drop and clear to builtin

[Joel Teichroeb <joel@teichroeb.net>]

---
 builtin/stash--helper.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
 git-stash.sh            |  4 +--
 2 files changed, 95 insertions(+), 2 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 18c4aba665..1598b82ac2 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -11,8 +11,15 @@
 #include "dir.h"
 
 static const char * const git_stash_helper_usage[] = {
+	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
 	N_("git stash--helper branch <branchname> [<stash>]"),
+	N_("git stash--helper clear"),
+	NULL
+};
+
+static const char * const git_stash_helper_drop_usage[] = {
+	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	NULL
 };
 
@@ -26,6 +33,11 @@ static const char * const git_stash_helper_branch_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_clear_usage[] = {
+	N_("git stash--helper clear"),
+	NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static int quiet;
 static char stash_index_path[PATH_MAX];
@@ -114,6 +126,29 @@ static int get_stash_info(struct stash_info *info, const char *commit)
 	return 0;
 }
 
+static int do_clear_stash(void)
+{
+	struct object_id obj;
+	if (get_oid(ref_stash, &obj))
+		return 0;
+
+	return delete_ref(NULL, ref_stash, &obj, 0);
+}
+
+static int clear_stash(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options, git_stash_helper_clear_usage, PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (argc != 0)
+		return error(_("git stash--helper clear with parameters is unimplemented"));
+
+	return do_clear_stash();
+}
+
 static int reset_tree(struct object_id i_tree, int update, int reset)
 {
 	struct unpack_trees_options opts;
@@ -313,6 +348,60 @@ static int apply_stash(int argc, const char **argv, const char *prefix)
 	return do_apply_stash(prefix, &info, index);
 }
 
+static int do_drop_stash(const char *prefix, struct stash_info *info)
+{
+	struct argv_array args = ARGV_ARRAY_INIT;
+	int ret;
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	argv_array_pushl(&args, "reflog", "delete", "--updateref", "--rewrite", NULL);
+	argv_array_push(&args, info->revision);
+	ret = cmd_reflog(args.argc, args.argv, prefix);
+	if (!ret) {
+		if (!quiet) {
+			printf(_("Dropped %s (%s)\n"), info->revision, sha1_to_hex(info->w_commit.hash));
+		}
+	} else {
+		return error(_("%s: Could not drop stash entry"), info->revision);
+	}
+
+	cp.git_cmd = 1;
+	/* Even though --quiet is specified, rev-parse still outputs the hash */
+	cp.no_stdout = 1;
+	argv_array_pushl(&cp.args, "rev-parse", "--verify", "--quiet", NULL);
+	argv_array_pushf(&cp.args, "%s@{0}", ref_stash);
+	ret = run_command(&cp);
+
+	if (ret)
+		do_clear_stash();
+
+	return 0;
+}
+
+static int drop_stash(int argc, const char **argv, const char *prefix)
+{
+	const char *commit = NULL;
+	struct stash_info info;
+	struct option options[] = {
+		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			git_stash_helper_drop_usage, 0);
+
+	if (argc == 1)
+		commit = argv[0];
+
+	if (get_stash_info(&info, commit))
+		return -1;
+
+	if (!info.is_stash_ref)
+		return error(_("'%s' is not a stash reference"), commit);
+
+	return do_drop_stash(prefix, &info);
+}
+
 static int branch_stash(int argc, const char **argv, const char *prefix)
 {
 	const char *commit = NULL, *branch = NULL;
@@ -371,6 +460,10 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		usage_with_options(git_stash_helper_usage, options);
 	else if (!strcmp(argv[0], "apply"))
 		result = apply_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "clear"))
+		result = clear_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "drop"))
+		result = drop_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "branch"))
 		result = branch_stash(argc, argv, prefix);
 	else {
diff --git a/git-stash.sh b/git-stash.sh
index 360643ad4e..54d0a6c21f 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -716,7 +716,7 @@ apply)
 	;;
 clear)
 	shift
-	clear_stash "$@"
+	git stash--helper clear "$@"
 	;;
 create)
 	shift
@@ -728,7 +728,7 @@ store)
 	;;
 drop)
 	shift
-	drop_stash "$@"
+	git stash--helper drop "$@"
 	;;
 pop)
 	shift
-- 
2.16.2