examples/foreign-toplevel: Add documenation and output selection

examples/foreign-toplevel.c

@@ -9,26 +9,27 @@
 
 #define WLR_FOREIGN_TOPLEVEL_MANAGEMENT_VERSION 3
 
-/**
- * Usage:
- * 1. foreign-toplevel
- * 	  Prints a list of opened toplevels
- * 2. foreign-toplevel -f <id>
- *    Focus the toplevel with the given id
- * 3. foreign-toplevel -a <id>
- *    Maximize the toplevel with the given id
- * 4. foreign-toplevel -u <id>
- *    Unmaximize the toplevel with the given id
- * 5. foreign-toplevel -i <id>
- *    Minimize the toplevel with the given id
- * 6. foreign-toplevel -r <id>
- * 	  Restore(unminimize) the toplevel with the given id
- * 7. foreign-toplevel -c <id>
- *    Close the toplevel with the given id
- * 8. foreign-toplevel -m
- *    Continuously print changes to the list of opened toplevels.
- *    Can be used together with some of the previous options.
- */
+
+static void print_help(void) {
+	static const char usage[] =
+		"Usage: foreign-toplevel [OPTIONS] ...\n"
+		"Manage and view information about toplevel windows.\n"
+		"\n"
+		"  -f <id>         focus\n"
+		"  -s <id>         fullscreen\n"
+		"  -o <output_id>  select output for fullscreen toplevel to appear on. Use this\n"
+		"                  option with -s. View available outputs with wayland-info.\n"
+		"  -S <id>         unfullscreen\n"
+		"  -a <id>         maximize\n"
+		"  -u <id>         unmaximize\n"
+		"  -i <id>         minimize\n"
+		"  -r <id>         restore(unminimize)\n"
+		"  -c <id>         close\n"
+		"  -m              continuously print changes to the list of opened toplevels\n"
+		"                  Can be used together with some of the previous options.\n"
+		"  -h              print help message and quit\n";
+	fprintf(stderr, "%s", usage);
+}
 
 enum toplevel_state_field {
 	TOPLEVEL_STATE_MAXIMIZED = (1 << 0),
@@ -39,6 +40,8 @@ enum toplevel_state_field {
 };
 
 static const uint32_t no_parent = (uint32_t)-1;
+static struct wl_output *pref_output = NULL;
+static uint32_t pref_output_id = UINT32_MAX;
 
 struct toplevel_state {
 	char *title;
@@ -271,9 +274,11 @@ struct wl_seat *seat = NULL;
 static void handle_global(void *data, struct wl_registry *registry,
 		uint32_t name, const char *interface, uint32_t version) {
 	if (strcmp(interface, wl_output_interface.name) == 0) {
-		struct wl_output *output = wl_registry_bind(registry, name,
-				&wl_output_interface, version);
-		wl_output_set_user_data(output, (void*)(size_t)name); // assign some ID to the output
+		if (name == pref_output_id) {
+			pref_output = wl_registry_bind(registry, name,
+					&wl_output_interface, version);
+
+		}
 	} else if (strcmp(interface,
 			zwlr_foreign_toplevel_manager_v1_interface.name) == 0) {
 		toplevel_manager = wl_registry_bind(registry, name,
@@ -324,8 +329,7 @@ int main(int argc, char **argv) {
 	int one_shot = 1;
 	int c;
 
-	// TODO maybe print usage with -h?
-	while ((c = getopt(argc, argv, "f:a:u:i:r:c:s:S:m")) != -1) {
+	while ((c = getopt(argc, argv, "f:a:u:i:r:c:s:S:mo:h")) != -1) {
 		switch (c) {
 		case 'f':
 			focus_id = atoi(optarg);
@@ -354,6 +358,17 @@ int main(int argc, char **argv) {
 		case 'm':
 			one_shot = 0;
 			break;
+		case 'o':
+			pref_output_id = atoi(optarg);
+			break;
+		case '?':
+			print_help();
+			return EXIT_FAILURE;
+			break;
+		case 'h':
+			print_help();
+			return EXIT_SUCCESS;
+			break;
 		}
 	}
 
@@ -391,7 +406,11 @@ int main(int argc, char **argv) {
 		zwlr_foreign_toplevel_handle_v1_unset_minimized(toplevel->zwlr_toplevel);
 	}
 	if ((toplevel = toplevel_by_id_or_bail(fullscreen_id))) {
-		zwlr_foreign_toplevel_handle_v1_set_fullscreen(toplevel->zwlr_toplevel, NULL);
+		if (pref_output_id != UINT32_MAX && pref_output == NULL) {
+			fprintf(stderr, "Could not find output %i\n", pref_output_id);
+		}
+
+		zwlr_foreign_toplevel_handle_v1_set_fullscreen(toplevel->zwlr_toplevel, pref_output);
 	}
 	if ((toplevel = toplevel_by_id_or_bail(unfullscreen_id))) {
 		zwlr_foreign_toplevel_handle_v1_unset_fullscreen(toplevel->zwlr_toplevel);