[Piglit] [PATCH 2/4] util: Parse -h|--help in piglit_parse_subtest_args()

[Chad Versace]

If the args contain -h or --help, then print some help and exit.
The help test describes how to list and run subtests.
---
 tests/util/piglit-util.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/tests/util/piglit-util.c b/tests/util/piglit-util.c
index 6ed9c9c..4bebf7d 100644
--- a/tests/util/piglit-util.c
+++ b/tests/util/piglit-util.c
@@ -650,8 +650,26 @@ piglit_parse_subtest_args(int *argc, char *argv[],
 	const char **selected_subtests = NULL;
 	size_t num_selected_subtests = 0;
 
+	const char *usage =
+		"usage:\n"
+		"  %1$s\n"
+		"      Run all subtests.\n"
+		"\n"
+		"  %1$s -list-subtests\n"
+		"      List all subtests.\n"
+		"\n"
+		"  %1$s -subtest SUBTEST [-subtest SUBTEST [...]]\n"
+		"      Run only the given subtests.\n"
+		"\n"
+		"  %1$s -h|--help\n"
+		"      Print this help message.\n"
+		;
+
 	for (j = 1; j < *argc; j++) {
-		if (streq(argv[j], "-subtest")) {
+		if (streq(argv[j], "-h") || streq(argv[j], "--help")) {
+			printf(usage, basename(argv[0]));
+			exit(EXIT_SUCCESS);
+		} else if (streq(argv[j], "-subtest")) {
 			int i;
 
 			++j;
-- 
2.10.0