make vis print version with command option -v

The man page states this is possible, so add the code.

Signed-off-by: Christian Hesse <mail@eworm.de>

1 files changed, 6 insertions, 3 deletions

diff --git a/vis.c b/vis.c
index 342e4c6..b05672f 100644
--- a/vis.c
+++ b/vis.c
@@ -2013,9 +2013,12 @@ int main(int argc, char *argv[]) {
 	for (int i = 1; i < argc; i++) {
 		if (argv[i][0] == '-') {
 			switch (argv[i][1]) {
-			/* handle command line arguments */
-			default:
-				break;
+				case 'v':
+					die("vis %s, compiled " __DATE__ " " __TIME__ "\n", VERSION);
+					break;
+				default:
+					die("Unknown command option: %s\n", argv[i]);
+					break;
 			}
 		} else if (argv[i][0] == '+') {
 			cmd = argv[i] + (argv[i][1] == '/' || argv[i][1] == '?');