[PATCH i-g-t v2 1/6] lib: add the ability to include a description with a test

[Thomas Wood <thomas.wood@xxxxxxxxx>]

The IGT_TEST_DESCRIPTION macro can be used to define a description for a
test.

v2: Remove semicolon from end of macro (Damien Lespiau)
    Add API documentation for the macro.

Signed-off-by: Thomas Wood <thomas.wood@xxxxxxxxx>
---
 lib/igt_core.c | 19 ++++++++++++++++---
 lib/igt_core.h | 12 ++++++++++++
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/lib/igt_core.c b/lib/igt_core.c
index e3d5fb0..3861121 100644
--- a/lib/igt_core.c
+++ b/lib/igt_core.c
@@ -223,6 +223,7 @@ bool test_child;
 enum {
  OPT_LIST_SUBTESTS,
  OPT_RUN_SUBTEST,
+ OPT_DESCRIPTION,
  OPT_DEBUG,
  OPT_HELP = 'h'
 };
@@ -360,6 +361,12 @@ static void common_exit_handler(int sig)
 	assert(sig != 0 || igt_exit_called);
 }
 
+static void print_test_description(void)
+{
+	if (&__igt_test_description)
+		printf("%s\n", __igt_test_description);
+}
+
 static void print_version(void)
 {
 	struct utsname uts;
@@ -380,11 +387,12 @@ static void print_usage(const char *help_str, bool output_on_stderr)
 {
 	FILE *f = output_on_stderr ? stderr : stdout;
 
-	fprintf(f, "Usage: %s [OPTIONS]\n"
-		   "  --list-subtests\n"
+	fprintf(f, "Usage: %s [OPTIONS]\n", command_str);
+	fprintf(f, "  --list-subtests\n"
 		   "  --run-subtest <pattern>\n"
 		   "  --debug\n"
-		   "  --help\n", command_str);
+		   "  --help-description\n"
+		   "  --help\n");
 	if (help_str)
 		fprintf(f, "%s\n", help_str);
 }
@@ -413,6 +421,7 @@ static int common_init(int argc, char **argv,
 	static struct option long_options[] = {
 		{"list-subtests", 0, 0, OPT_LIST_SUBTESTS},
 		{"run-subtest", 1, 0, OPT_RUN_SUBTEST},
+		{"help-description", 0, 0, OPT_DESCRIPTION},
 		{"debug", 0, 0, OPT_DEBUG},
 		{"help", 0, 0, OPT_HELP},
 		{0, 0, 0, 0}
@@ -510,6 +519,10 @@ static int common_init(int argc, char **argv,
 			if (!list_subtests)
 				run_single_subtest = strdup(optarg);
 			break;
+		case OPT_DESCRIPTION:
+			print_test_description();
+			ret = -1;
+			goto out;
 		case OPT_HELP:
 			print_usage(help_str, false);
 			ret = -1;
diff --git a/lib/igt_core.h b/lib/igt_core.h
index b8f6702..69e54d8 100644
--- a/lib/igt_core.h
+++ b/lib/igt_core.h
@@ -38,6 +38,18 @@
 #include <stdarg.h>
 #include <getopt.h>
 
+extern const char* __igt_test_description __attribute__((weak));
+
+/**
+ * IGT_TEST_DESCRIPTION:
+ * @str: description string
+ *
+ * Defines a description for a test. This is used as the output for the
+ * "--help-description" option and is also included in the generated
+ * documentation.
+ */
+#define IGT_TEST_DESCRIPTION(str) const char* __igt_test_description = str
+
 /**
  * IGT_EXIT_TIMEOUT:
  *
-- 
2.1.0

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