Revert "No need for usage()"

This reverts most of commit a6dc051e3744ce5b14c54d2d246d3e8258207e76 and fixes
some related stuff:

- keep spelling fixes from original commit
- make -h and -v also work when followed by more arguments
- any unknown flag prints usage
- fix output of -v to display "slock: version 1.3" instead of "slock: slock-1.3"

1 files changed, 15 insertions, 2 deletions

diff --git a/slock.c b/slock.c
index 2aa395e..c9cdee2 100644
--- a/slock.c
+++ b/slock.c
@@ -273,15 +273,28 @@ lockscreen(Display *dpy, int screen)
 	return NULL;
 }
 
-int
-main(int argc, char **argv)
+static void
+usage(void)
 {
+	fprintf(stderr, "usage: slock [-v|POST_LOCK_CMD]\n");
+	exit(1);
+}
+
+int
+main(int argc, char **argv) {
 #ifndef HAVE_BSD_AUTH
 	const char *pws;
 #endif
 	Display *dpy;
 	int screen;
 
+	if ((argc >= 2) && !strcmp("-v", argv[1]))
+		die("version %s, © 2006-2016 slock engineers\n", VERSION);
+
+	/* treat first argument starting with a '-' as option */
+	if ((argc >= 2) && argv[1][0] == '-')
+		usage();
+
 #ifdef __linux__
 	dontkillme();
 #endif