Add usage

diff --git a/noice.c b/noice.c
index 38604dc7159b5b8e8342c6478b83a6badbb03120..9f4f0cb05a10379e4edff727e3533cec45fd8d74 100644 (file)
--- a/noice.c
+++ b/noice.c
@@ -878,12 +878,22 @@ moretyping:
        }
 }
 
+void
+usage(char *argv0)
+{
+       fprintf(stderr, "usage: %s [dir]\n", argv0);
+       exit(1);
+}
+
 int
 main(int argc, char *argv[])
 {
        char cwd[PATH_MAX], *ipath;
        char *ifilter;
 
+       if (argc > 2)
+               usage(argv[0]);
+
        /* Confirm we are in a terminal */
        if (!isatty(0) || !isatty(1)) {
                fprintf(stderr, "stdin or stdout is not a tty\n");