Add a log_verbose logging function for debug output

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

src/ratbagd-device.c

@@ -277,11 +277,17 @@ int ratbagd_device_new(struct ratbagd_device **out,
 	if (r < 0)
 		return r;
 
+
 	device->n_profiles = ratbag_device_get_num_profiles(device->lib_device);
 	device->profiles = calloc(device->n_profiles, sizeof(*device->profiles));
 	if (!device->profiles)
 		return -ENOMEM;
 
+	log_verbose("%s: \"%s\", %d profiles\n",
+		    name,
+		    ratbag_device_get_name(lib_device),
+		    device->n_profiles);
+
 	for (i = 0; i < device->n_profiles; ++i) {
 		profile = ratbag_device_get_profile(device->lib_device, i);
 		if (!profile)

src/ratbagd.c

@@ -34,6 +34,19 @@
 #include "ratbagd.h"
 #include "shared-macro.h"
 
+static bool verbose = false;
+
+void log_verbose(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+
+	if (verbose)
+		vprintf(fmt, args);
+	va_end(args);
+}
+
 static int ratbagd_find_device(sd_bus *bus,
 			       const char *path,
 			       const char *interface,
@@ -449,11 +462,15 @@ int main(int argc, char *argv[])
 	struct ratbagd *ctx = NULL;
 	int r;
 
-	if (argc != 1) {
-		fprintf(stderr, "%s: This program takes no arguments\n",
-			program_invocation_short_name);
-		r = -EINVAL;
-		goto exit;
+	if (argc > 1) {
+		if (streq(argv[1], "--verbose")) {
+			verbose = true;
+		} else {
+			fprintf(stderr, "Usage: %s [--verbose]\n",
+				program_invocation_short_name);
+			r = -EINVAL;
+			goto exit;
+		}
 	}
 
 	r = ratbagd_new(&ctx);

src/ratbagd.h

@@ -41,6 +41,9 @@ struct ratbagd_device;
 struct ratbagd_profile;
 struct ratbagd_resolution;
 
+
+void log_verbose(const char *fmt, ...) _printf_(1, 2);
+
 /*
  * Profiles
  */