submodule--helper: rename "absorb-git-dirs" to "absorbgitdirs"

Rename the "absorb-git-dirs" subcommand to "absorbgitdirs", which is
what the "git submodule" command itself has called it since the
subcommand was implemented in f6f8586140 (submodule: add
absorb-git-dir function, 2016-12-12).

Having these two be different will make it more tedious to dispatch to
eventually dispatch "git submodule--helper" directly, as we'd need to
retain this name mapping. So let's get rid of this needless
inconsistency.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/submodule--helper.c

@@ -2787,7 +2787,7 @@ static int absorb_git_dirs(int argc, const char **argv, const char *prefix)
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper absorb-git-dirs [<options>] [<path>...]"),
+		N_("git submodule--helper absorbgitdirs [<options>] [<path>...]"),
 		NULL
 	};
 
@@ -3389,7 +3389,7 @@ static struct cmd_struct commands[] = {
 	{"deinit", module_deinit, 0},
 	{"summary", module_summary, SUPPORT_SUPER_PREFIX},
 	{"push-check", push_check, 0},
-	{"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
+	{"absorbgitdirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},
 	{"is-active", is_active, 0},
 	{"check-name", check_name, 0},
 	{"config", module_config, 0},

git-submodule.sh

@@ -552,7 +552,7 @@ cmd_sync()
 
 cmd_absorbgitdirs()
 {
-	git submodule--helper absorb-git-dirs --prefix "$wt_prefix" "$@"
+	git submodule--helper absorbgitdirs --prefix "$wt_prefix" "$@"
 }
 
 # This loop parses the command line arguments to find the

submodule.c

@@ -2374,7 +2374,7 @@ void absorb_git_dir_into_superproject(const char *path,
 		cp.no_stdin = 1;
 		strvec_pushl(&cp.args, "--super-prefix", sb.buf,
 			     "submodule--helper",
-			     "absorb-git-dirs", NULL);
+			     "absorbgitdirs", NULL);
 		prepare_submodule_repo_env(&cp.env);
 		if (run_command(&cp))
 			die(_("could not recurse into submodule '%s'"), path);