[PATCH v3] submodule: port subcommand 'set-branch' from shell to C
To
git@vger.kernel.org
Cc
christian.couder@gmail.com
kaartic.sivaraam@gmail.com
liu.denton@gmail.com
gitster@pobox.com
congdanhqx@gmail.com
sunshine@sunshineco.com
Shourya Shukla
Christian Couder
From
Shourya Shukla
Date
2020-05-21 16:38:19 UTC
Convert submodule subcommand 'set-branch' to a builtin and call it via
'git-submodule.sh'.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
Helped-by: Denton Liu <liu.denton@gmail.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Shourya Shukla <shouryashukla.oo@gmail.com>
---
Thank you for the review Eric. I have changed the commit message,
and the error prompts. Also, I have added a brief comment about
the `quiet` option.

 builtin/submodule--helper.c | 45 +++++++++++++++++++++++++++++++++++++
 git-submodule.sh            | 32 +++-----------------------
 2 files changed, 48 insertions(+), 29 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index f50745a03f..d14b9856a3 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2284,6 +2284,50 @@ static int module_set_url(int argc, const char **argv, const char *prefix)
 	return 0;
 }
 
+static int module_set_branch(int argc, const char **argv, const char *prefix)
+{
+	/*
+	 * The `quiet` option is present for backward compatibility
+	 * but is currently not used.
+	 */
+	int quiet = 0, opt_default = 0;
+	const char *opt_branch = NULL;
+	const char *path;
+	char *config_name;
+
+	struct option options[] = {
+		OPT__QUIET(&quiet,
+			N_("suppress output for setting default tracking branch")),
+		OPT_BOOL(0, "default", &opt_default,
+			N_("set the default tracking branch to master")),
+		OPT_STRING(0, "branch", &opt_branch, N_("branch"),
+			N_("set the default tracking branch")),
+		OPT_END()
+	};
+	const char *const usage[] = {
+		N_("git submodule--helper set-branch [--quiet] (-d|--default) <path>"),
+		N_("git submodule--helper set-branch [--quiet] (-b|--branch) <branch> <path>"),
+		NULL
+	};
+
+	argc = parse_options(argc, argv, prefix, options, usage, 0);
+
+	if (!opt_branch && !opt_default)
+		die(_("--branch or --default required"));
+
+	if (opt_branch && opt_default)
+		die(_("--branch and --default are mutually exclusive"));
+
+	if (argc != 1 || !(path = argv[0]))
+		usage_with_options(usage, options);
+
+	config_name = xstrfmt("submodule.%s.branch", path);
+	config_set_in_gitmodules_file_gently(config_name, opt_branch);
+
+	free(config_name);
+	return 0;
+}
+
 #define SUPPORT_SUPER_PREFIX (1<<0)
 
 struct cmd_struct {
@@ -2315,6 +2359,7 @@ static struct cmd_struct commands[] = {
 	{"check-name", check_name, 0},
 	{"config", module_config, 0},
 	{"set-url", module_set_url, 0},
+	{"set-branch", module_set_branch, 0},
 };
 
 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
diff --git a/git-submodule.sh b/git-submodule.sh
index 39ebdf25b5..8c56191f77 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -719,7 +719,7 @@ cmd_update()
 # $@ = requested path
 #
 cmd_set_branch() {
-	unset_branch=false
+	default=
 	branch=
 
 	while test $# -ne 0
@@ -729,7 +729,7 @@ cmd_set_branch() {
 			# we don't do anything with this but we need to accept it
 			;;
 		-d|--default)
-			unset_branch=true
+			default=1
 			;;
 		-b|--branch)
 			case "$2" in '') usage ;; esac
@@ -750,33 +750,7 @@ cmd_set_branch() {
 		shift
 	done
 
-	if test $# -ne 1
-	then
-		usage
-	fi
-
-	# we can't use `git submodule--helper name` here because internally, it
-	# hashes the path so a trailing slash could lead to an unintentional no match
-	name="$(git submodule--helper list "$1" | cut -f2)"
-	if test -z "$name"
-	then
-		exit 1
-	fi
-
-	test -n "$branch"; has_branch=$?
-	test "$unset_branch" = true; has_unset_branch=$?
-
-	if test $((!$has_branch != !$has_unset_branch)) -eq 0
-	then
-		usage
-	fi
-
-	if test $has_branch -eq 0
-	then
-		git submodule--helper config submodule."$name".branch "$branch"
-	else
-		git submodule--helper config --unset submodule."$name".branch
-	fi
+	git ${wt_prefix:+-C "$wt_prefix"} ${prefix:+--super-prefix "$prefix"} submodule--helper set-branch ${GIT_QUIET:+--quiet} ${branch:+--branch $branch} ${default:+--default} -- "$@"
 }
 
 #
-- 
2.26.2