[RFC PATCH 08/20] submodule--helper: pretend to be "git submodule" in "-h" output

[Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>]

Change the usage output for "git submodule--helper" so that it will
pretend to be named "git submodule". This will allow us to dispatch
further into "git submodule--helper" from git-submodule.sh while
emitting the correct usage output.

This fixes a bug that's been there ever since "git submodule
absorbgitdirs" was added in f6f85861400 (submodule: add absorb-git-dir
function, 2016-12-12). Before this we'd emit e.g. this on invalid
usage:

	$ git submodule absorbgitdirs --blah
	error: unknown option `blah'
	usage: git submodule--helper absorbgitdirs [<options>] [<path>...]

Now we'll emit the same, except that the usage line is now referring
to the correct command run by the user:

	usage: git submodule absorbgitdirs [<options>] [<path>...]
	[.. same usage output ...]

Note that in the case of "status", "deinit" and "update" we were
already referring to ourselves as "git submodule" in
builtin/submodule--helper.c.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 builtin/submodule--helper.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 8df1541baf8..3173295ed8e 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -286,7 +286,7 @@ static int module_list(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper list [--prefix=<path>] [<path>...]"),
+		N_("git submodule list [--prefix=<path>] [<path>...]"),
 		NULL
 	};
 
@@ -444,7 +444,7 @@ static int module_foreach(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper foreach [--quiet] [--recursive] [--] <command>"),
+		N_("git submodule foreach [--quiet] [--recursive] [--] <command>"),
 		NULL
 	};
 
@@ -582,7 +582,7 @@ static int module_init(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper init [<options>] [<path>]"),
+		N_("git submodule init [<options>] [<path>]"),
 		NULL
 	};
 
@@ -786,7 +786,7 @@ static int module_name(int argc, const char **argv, const char *prefix)
 	const struct submodule *sub;
 
 	if (argc != 2)
-		usage(_("git submodule--helper name <path>"));
+		usage(_("git submodule name <path>"));
 
 	sub = submodule_from_path(the_repository, null_oid(), argv[1]);
 
@@ -1185,7 +1185,7 @@ static int module_summary(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper summary [<options>] [<commit>] [--] [<path>]"),
+		N_("git submodule summary [<options>] [<commit>] [--] [<path>]"),
 		NULL
 	};
 
@@ -1349,7 +1349,7 @@ static int module_sync(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
+		N_("git submodule sync [--quiet] [--recursive] [<path>]"),
 		NULL
 	};
 
@@ -1789,7 +1789,7 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
+		N_("git submodule clone [--prefix=<path>] [--quiet] "
 		   "[--reference <repository>] [--name <name>] [--depth <depth>] "
 		   "[--single-branch] [--filter <filter-spec>] "
 		   "--url <url> --path <path>"),
@@ -2784,7 +2784,7 @@ static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper absorbgitdirs [<options>] [<path>...]"),
+		N_("git submodule absorbgitdirs [<options>] [<path>...]"),
 		NULL
 	};
 
@@ -2848,9 +2848,9 @@ static int module_config(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper config <name> [<value>]"),
-		N_("git submodule--helper config --unset <name>"),
-		"git submodule--helper config --check-writeable",
+		N_("git submodule config <name> [<value>]"),
+		N_("git submodule config --unset <name>"),
+		"git submodule config --check-writeable",
 		NULL
 	};
 
@@ -2889,7 +2889,7 @@ static int module_set_url(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	const char *const usage[] = {
-		N_("git submodule--helper set-url [--quiet] <path> <newurl>"),
+		N_("git submodule set-url [--quiet] <path> <newurl>"),
 		NULL
 	};
 
@@ -2928,8 +2928,8 @@ static int module_set_branch(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	const char *const usage[] = {
-		N_("git submodule--helper set-branch [-q|--quiet] (-d|--default) <path>"),
-		N_("git submodule--helper set-branch [-q|--quiet] (-b|--branch) <branch> <path>"),
+		N_("git submodule set-branch [-q|--quiet] (-d|--default) <path>"),
+		N_("git submodule set-branch [-q|--quiet] (-b|--branch) <branch> <path>"),
 		NULL
 	};
 
@@ -2970,7 +2970,7 @@ static int module_create_branch(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 	const char *const usage[] = {
-		N_("git submodule--helper create-branch [-f|--force] [--create-reflog] [-q|--quiet] [-t|--track] [-n|--dry-run] <name> <start-oid> <start-name>"),
+		N_("git submodule create-branch [-f|--force] [--create-reflog] [-q|--quiet] [-t|--track] [-n|--dry-run] <name> <start-oid> <start-name>"),
 		NULL
 	};
 
@@ -3273,7 +3273,7 @@ static int module_add(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const usage[] = {
-		N_("git submodule--helper add [<options>] [--] <repository> [<path>]"),
+		N_("git submodule add [<options>] [--] <repository> [<path>]"),
 		NULL
 	};
 
-- 
2.36.1.1178.gb5b1747c546