swaylock: add option parsing

1 files changed, 40 insertions, 2 deletions

diff --git a/swaylock/main.c b/swaylock/main.c
index 9de95e7a..0bf64621 100644
--- a/swaylock/main.c
+++ b/swaylock/main.c
@@ -7,6 +7,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <pwd.h>
+#include <getopt.h>
 #include "client/window.h"
 #include "client/registry.h"
 #include "client/cairo.h"
@@ -92,6 +93,44 @@ void notify_key(enum wl_keyboard_key_state state, xkb_keysym_t sym, uint32_t cod
 
 int main(int argc, char **argv) {
         init_log(L_INFO);
+
+        static struct option long_options[] = {
+                {"help", no_argument, NULL, 'h'},
+                {"version", no_argument, NULL, 'v'},
+                {0, 0, 0, 0}
+        };
+
+        const char *usage =
+                "Usage: swaylock <image> [stretch|fit|fill|center|tile]\n"
+                "\n"
+                "  -h, --help             Show help message and quit.\n"
+                "  -v, --version          Show the version number and quit.\n";
+
+        int c;
+        while (1) {
+                int option_index = 0;
+                c = getopt_long(argc, argv, "hv", long_options, &option_index);
+                if (c == -1) {
+                        break;
+                }
+                switch (c) {
+                case 'v':
+#if defined SWAY_GIT_VERSION && defined SWAY_GIT_BRANCH && defined SWAY_VERSION_DATE
+                        fprintf(stdout, "swaylock version %s (%s, branch \"%s\")\n", SWAY_GIT_VERSION, SWAY_VERSION_DATE, SWAY_GIT_BRANCH);
+#else
+                        fprintf(stdout, "version not detected\n");
+#endif
+                        exit(EXIT_SUCCESS);
+                        break;
+                default:
+                        fprintf(stderr, "%s", usage);
+                        exit(EXIT_FAILURE);
+                }
+        }
+
+        char *image_path = argv[optind];
+        char *scaling_mode_str = argv[optind+1];
+
         password = malloc(1024); // TODO: Let this grow
         password[0] = '\0';
         surfaces = create_list();
@@ -115,7 +154,7 @@ int main(int argc, char **argv) {
 
 #ifdef WITH_GDK_PIXBUF
         GError *err = NULL;
-        GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(argv[1], &err); // TODO: Parse i3lock arguments
+        GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(image_path, &err); // TODO: Parse i3lock arguments
         if (!pixbuf) {
                 sway_abort("Failed to load background image.");
         }
@@ -130,7 +169,6 @@ int main(int argc, char **argv) {
         double width = cairo_image_surface_get_width(image);
         double height = cairo_image_surface_get_height(image);
 
-        const char *scaling_mode_str = argv[2];
         enum scaling_mode scaling_mode = SCALING_MODE_STRETCH;
         if (strcmp(scaling_mode_str, "stretch") == 0) {
                 scaling_mode = SCALING_MODE_STRETCH;