[PATCH v5 12/16] bisect--helper: make `state` optional

["Johannes Schindelin via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Johannes Schindelin <johannes.schindelin@xxxxxx>

In preparation for making `git bisect` a real built-in, let's prepare
the `bisect--helper` built-in to handle `git bisect--helper good` and
`git bisect--helper bad`, i.e. do not require the `state` subcommand to
be passed explicitly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 builtin/bisect--helper.c | 22 +++++++++++++++++++++-
 git-bisect.sh            |  2 +-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 3f333cfae76..9f78bd45ca5 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -1447,6 +1447,7 @@ static int cmd_bisect_run(int argc, const char **argv, const char *prefix)
 
 int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 {
+	struct strvec args = STRVEC_INIT;
 	parse_opt_subcommand_fn *fn = NULL;
 	int res = 0;
 	struct option options[] = {
@@ -1464,10 +1465,29 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     bisect_usage, 0);
+			     bisect_usage, PARSE_OPT_SUBCOMMAND_OPTIONAL);
+
+	if (!fn) {
+		if (!argc)
+			usage_msg_opt(_("need a command"), bisect_usage,
+				      options);
+
+		set_terms("bad", "good");
+		get_terms();
+		if (check_and_set_terms(argv[0]))
+			usage_msg_optf(_("unknown command: '%s'"), bisect_usage,
+				       options, argv[0]);
+
+		strvec_push(&args, "state");
+		strvec_pushv(&args, argv);
+		argc = args.nr;
+		argv = args.v;
+		fn = cmd_bisect_state;
+	}
 
 	res = fn(argc, argv, prefix);
 	free_terms();
+	strvec_clear(&args);
 
 	return is_bisect_success(res) ? 0 : -res;
 }
diff --git a/git-bisect.sh b/git-bisect.sh
index e19847eba0d..f4df8709d84 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -60,7 +60,7 @@ case "$#" in
 	start)
 		git bisect--helper start "$@" ;;
 	bad|good|new|old|"$TERM_BAD"|"$TERM_GOOD")
-		git bisect--helper state "$cmd" "$@" ;;
+		git bisect--helper "$cmd" "$@" ;;
 	skip)
 		git bisect--helper skip "$@" || exit;;
 	next)
-- 
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