weston-image --help works. Also help if no filename is given

diff --git a/clients/image.c b/clients/image.c
index 112b93d..573117c 100644 (file)
--- a/clients/image.c
+++ b/clients/image.c
@@ -412,6 +412,11 @@ main(int argc, char *argv[])
        int i;
        int image_counter = 0;
 
+       if (argc <= 1 || argv[1][0]=='-') {
+               printf("Usage: %s image...\n", argv[0]);
+               return 1;
+       }
+
        d = display_create(&argc, argv);
        if (d == NULL) {
                fprintf(stderr, "failed to create display: %m\n");