[PATCH v10 09/21] stash: convert drop and clear to builtin

From

Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>

Date

Oct 14, 2018, 22:11 UTC

Message-ID

<97e3fef686fdd1659f193819ec8c14bf753aa7cb.1539553398.git.ungureanupaulsebastian@gmail.com>

In-Reply-To

<cover.1539553398.git.ungureanupaulsebastian@gmail.com>

From: Joel Teichroeb <joel@teichroeb.net>

Signed-off-by: Joel Teichroeb <joel@teichroeb.net>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 117 ++++++++++++++++++++++++++++++++++++++++
 git-stash.sh            |   4 +-
 2 files changed, 119 insertions(+), 2 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index c43e0aacbb..aff6cda4c9 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -12,7 +12,14 @@
 #include "rerere.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 clear"),
+	NULL
+};
+
+static const char * const git_stash_helper_drop_usage[] = {
+	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	NULL
 };
 
@@ -21,6 +28,11 @@ static const char * const git_stash_helper_apply_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 struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -139,6 +151,32 @@ static int get_stash_info(struct stash_info *info, int argc, const char **argv)
 	return !(ret == 0 || ret == 1);
 }
 
+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)
+		return error(_("git stash clear with parameters is "
+			       "unimplemented"));
+
+	return do_clear_stash();
+}
+
 static int reset_tree(struct object_id *i_tree, int update, int reset)
 {
 	int nr_trees = 1;
@@ -426,6 +464,81 @@ static int apply_stash(int argc, const char **argv, const char *prefix)
 	return ret;
 }
 
+static int do_drop_stash(const char *prefix, struct stash_info *info, int quiet)
+{
+	int ret;
+	struct child_process cp_reflog = CHILD_PROCESS_INIT;
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	/*
+	 * reflog does not provide a simple function for deleting refs. One will
+	 * need to be added to avoid implementing too much reflog code here
+	 */
+
+	cp_reflog.git_cmd = 1;
+	argv_array_pushl(&cp_reflog.args, "reflog", "delete", "--updateref",
+			 "--rewrite", NULL);
+	argv_array_push(&cp_reflog.args, info->revision.buf);
+	ret = run_command(&cp_reflog);
+	if (!ret) {
+		if (!quiet)
+			printf_ln(_("Dropped %s (%s)"), info->revision.buf,
+				  oid_to_hex(&info->w_commit));
+	} else {
+		return error(_("%s: Could not drop stash entry"),
+			     info->revision.buf);
+	}
+
+	/*
+	 * This could easily be replaced by get_oid, but currently it will throw
+	 * a fatal error when a reflog is empty, which we can not recover from.
+	 */
+	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);
+
+	/* do_clear_stash if we just dropped the last stash entry */
+	if (ret)
+		do_clear_stash();
+
+	return 0;
+}
+
+static void assert_stash_ref(struct stash_info *info)
+{
+	if (!info->is_stash_ref) {
+		free_stash_info(info);
+		error(_("'%s' is not a stash reference"), info->revision.buf);
+		exit(128);
+	}
+}
+
+static int drop_stash(int argc, const char **argv, const char *prefix)
+{
+	int ret;
+	int quiet = 0;
+	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 (get_stash_info(&info, argc, argv))
+		return -1;
+
+	assert_stash_ref(&info);
+
+	ret = do_drop_stash(prefix, &info, quiet);
+	free_stash_info(&info);
+	return ret;
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -448,6 +561,10 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		usage_with_options(git_stash_helper_usage, options);
 	if (!strcmp(argv[0], "apply"))
 		return !!apply_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "clear"))
+		return !!clear_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "drop"))
+		return !!drop_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index 809b1c2d1d..a99d5dc9e5 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -653,7 +653,7 @@ apply)
 	;;
 clear)
 	shift
-	clear_stash "$@"
+	git stash--helper clear "$@"
 	;;
 create)
 	shift
@@ -665,7 +665,7 @@ store)
 	;;
 drop)
 	shift
-	drop_stash "$@"
+	git stash--helper drop "$@"
 	;;
 pop)
 	shift

-- 
2.19.0.rc0.23.g10a62394e7