Merge pull request #480 from crondog/swaylocktrans2

swaylock: Allow for transparent color values

swaylock/main.c

@@ -212,7 +212,7 @@ int main(int argc, char **argv) {
 		"Usage: swaylock [options...]\n"
 		"\n"
 		"  -h, --help                 Show help message and quit.\n"
-		"  -c, --color <rrggbb>   Turn the screen into the given color instead of white.\n"
+		"  -c, --color <rrggbb[aa]>   Turn the screen into the given color instead of white.\n"
 		"  -s, --scaling              Scaling mode: stretch, fill, fit, center, tile.\n"
 		"  -t, --tiling               Same as --scaling=tile.\n"
 		"  -v, --version              Show the version number and quit.\n"
@@ -227,15 +227,21 @@ int main(int argc, char **argv) {
 		}
 		switch (c) {
 		case 'c': 
-			if (strlen(optarg) < 6) {
+		{
-				fprintf(stderr, "color must be specified in 3 byte format, e.g. ff0000\n");
+			int colorlen = strlen(optarg);
+			if (colorlen < 6 || colorlen == 7 || colorlen > 8) {
+				fprintf(stderr, "color must be specified in 3 or 4 byte format, e.g. ff0000 or ff0000ff\n");
 				exit(EXIT_FAILURE);
 			}
 			color = strtol(optarg, NULL, 16);
+
+			if (colorlen == 6) {
 				color <<= 8;
 				color |= 0xFF;
+			}
 			sway_log(L_DEBUG, "color: 0x%x", color);
 			break;
+		}
 		case 'i':
 			image_path = optarg;
 			break;