[PATCH v4 09/12] submodule--helper: understand --checkout, --merge and --rebase synonyms

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Understand --checkout, --merge and --rebase synonyms for
--update={checkout,merge,rebase}, as well as the short options that
'git submodule' itself understands.

This removes a difference between the CLI API of "git submodule" and
"git submodule--helper", making it easier to make the latter an alias
for the former. See 48308681b07 (git submodule update: have a
dedicated helper for cloning, 2016-02-29) for the initial addition of
--update.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 builtin/submodule--helper.c | 30 ++++++++++++++++++++++++++++++
 git-submodule.sh            | 14 +++++++++-----
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index d145d53addd..e35ae0322ee 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2405,6 +2405,23 @@ static void ensure_core_worktree(const char *path)
 	}
 }
 
+static const char *submodule_update_type_to_label(enum submodule_update_type type)
+{
+	switch (type) {
+	case SM_UPDATE_CHECKOUT:
+		return "checkout";
+	case SM_UPDATE_MERGE:
+		return "merge";
+	case SM_UPDATE_REBASE:
+		return "rebase";
+	case SM_UPDATE_UNSPECIFIED:
+	case SM_UPDATE_NONE:
+	case SM_UPDATE_COMMAND:
+		break;
+	}
+	BUG("unreachable with type %d", type);
+}
+
 static void update_data_to_args(struct update_data *update_data, struct strvec *args)
 {
 	strvec_pushl(args, "submodule--helper", "update", "--recursive", NULL);
@@ -2583,6 +2600,7 @@ static int module_update(int argc, const char **argv, const char *prefix)
 	struct update_data opt = UPDATE_DATA_INIT;
 	struct list_objects_filter_options filter_options;
 	int ret;
+	enum submodule_update_type update_type = SM_UPDATE_UNSPECIFIED;
 
 	struct option module_update_options[] = {
 		OPT__FORCE(&opt.force, N_("force checkout updates"), 0),
@@ -2604,6 +2622,15 @@ static int module_update(int argc, const char **argv, const char *prefix)
 		OPT_STRING(0, "update", &opt.update_default,
 			   N_("string"),
 			   N_("rebase, merge, checkout or none")),
+		OPT_SET_INT(0, "checkout", &update_type,
+			N_("use the 'checkout' update strategy (default)"),
+			SM_UPDATE_CHECKOUT),
+		OPT_SET_INT('m', "merge", &update_type,
+			N_("use the 'merge' update strategy"),
+			SM_UPDATE_MERGE),
+		OPT_SET_INT('r', "rebase", &update_type,
+			N_("use the 'rebase' update strategy"),
+			SM_UPDATE_REBASE),
 		OPT_STRING_LIST(0, "reference", &opt.references, N_("repo"),
 			   N_("reference repository")),
 		OPT_BOOL(0, "dissociate", &opt.dissociate,
@@ -2653,6 +2680,9 @@ static int module_update(int argc, const char **argv, const char *prefix)
 
 	opt.filter_options = &filter_options;
 
+	if (update_type != SM_UPDATE_UNSPECIFIED)
+		opt.update_default = submodule_update_type_to_label(update_type);
+
 	if (opt.update_default)
 		if (parse_submodule_update_strategy(opt.update_default,
 						    &opt.update_strategy) < 0)
diff --git a/git-submodule.sh b/git-submodule.sh
index 1c1dc320922..7fc7119fb21 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -40,7 +40,9 @@ require_init=
 files=
 remote=
 nofetch=
-update=
+rebase=
+merge=
+checkout=
 custom_name=
 depth=
 progress=
@@ -260,7 +262,7 @@ cmd_update()
 			force=$1
 			;;
 		-r|--rebase)
-			update="rebase"
+			rebase=1
 			;;
 		--reference)
 			case "$2" in '') usage ;; esac
@@ -274,13 +276,13 @@ cmd_update()
 			dissociate=1
 			;;
 		-m|--merge)
-			update="merge"
+			merge=1
 			;;
 		--recursive)
 			recursive=1
 			;;
 		--checkout)
-			update="checkout"
+			checkout=1
 			;;
 		--recommend-shallow)
 			recommend_shallow="--recommend-shallow"
@@ -341,7 +343,9 @@ cmd_update()
 		${init:+--init} \
 		${nofetch:+--no-fetch} \
 		${wt_prefix:+--prefix "$wt_prefix"} \
-		${update:+--update "$update"} \
+		${rebase:+--rebase} \
+		${merge:+--merge} \
+		${checkout:+--checkout} \
 		${reference:+"$reference"} \
 		${dissociate:+"--dissociate"} \
 		${depth:+"$depth"} \
-- 
2.37.0.880.gf07d56b18ba




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