feat: mmsg -W flag to list all windows with details

Extends IPC protocol with window_info event and list_windows request
to query all windows instead of just the focused one. The new -W
flag outputs title, appid, geometry, floating/fullscreen state, and tags
for each window.

Usage: mmsg -g -W

mmsg/mmsg.c

@@ -42,6 +42,7 @@ static int eflag;
 static int kflag;
 static int bflag;
 static int Aflag;
+static int Wflag;
 
 static uint32_t occ, seltags, total_clients, urg;
 
@@ -288,6 +289,19 @@ static void dwl_ipc_output_keymode(void *data,
 	printf("keymode %s\n", keymode);
 }
 
+static void dwl_ipc_output_window_info(void *data,
+									   struct zdwl_ipc_output_v2 *dwl_ipc_output,
+									   const char *title, const char *appid,
+									   int32_t x, int32_t y,
+									   int32_t width, int32_t height,
+									   uint32_t floating, uint32_t fullscreen,
+									   uint32_t tags) {
+	if (!Wflag)
+		return;
+	printf("window: title=\"%s\" appid=\"%s\" x=%d y=%d width=%d height=%d floating=%u fullscreen=%u tags=%u\n",
+		   title, appid, x, y, width, height, floating, fullscreen, tags);
+}
+
 static void dwl_ipc_output_fullscreen(void *data,
 									  struct zdwl_ipc_output_v2 *dwl_ipc_output,
 									  uint32_t is_fullscreen) {
@@ -427,6 +441,7 @@ static const struct zdwl_ipc_output_v2_listener dwl_ipc_output_listener = {
 	.kb_layout = dwl_ipc_output_kb_layout,
 	.keymode = dwl_ipc_output_keymode,
 	.scalefactor = dwl_ipc_output_scalefactor,
+	.window_info = dwl_ipc_output_window_info,
 	.frame = dwl_ipc_output_frame,
 };
 
@@ -447,6 +462,9 @@ static void wl_output_name(void *data, struct wl_output *output,
 		zdwl_ipc_manager_v2_get_output(dwl_ipc_manager, output);
 	zdwl_ipc_output_v2_add_listener(dwl_ipc_output, &dwl_ipc_output_listener,
 									output_name ? NULL : strdup(name));
+	if (Wflag && mode & GET) {
+		zdwl_ipc_output_v2_list_windows(dwl_ipc_output);
+	}
 }
 
 static const struct wl_output_listener output_listener = {
@@ -504,7 +522,7 @@ static void usage(void) {
 			"\t%s [-OTLq]\n"
 			"\t%s [-o <output>] -s [-t <tags>] [-l <layout>] [-c <tags>] [-d "
 			"<cmd>,<arg1>,<arg2>,<arg3>,<arg4>,<arg5>]\n"
-			"\t%s [-o <output>] (-g | -w) [-OotlcvmfxekbA]\n",
+			"\t%s [-o <output>] (-g | -w) [-OotlcvmfxekbAW]\n",
 			argv0, argv0, argv0);
 	exit(2);
 }
@@ -752,6 +770,12 @@ int main(int argc, char *argv[]) {
 			usage();
 		mode |= GET;
 		break;
+	case 'W':
+		Wflag = 1;
+		if (mode == SET)
+			usage();
+		mode |= GET;
+		break;
 	default:
 		fprintf(stderr, "bad option %c\n", ARGC());
 		usage();
@@ -762,7 +786,7 @@ int main(int argc, char *argv[]) {
 	if (mode & GET && !output_name &&
 		!(oflag || tflag || lflag || Oflag || Tflag || Lflag || cflag ||
 		  vflag || mflag || fflag || xflag || eflag || kflag || bflag ||
-		  Aflag || dflag))
+		  Aflag || Wflag || dflag))
 		oflag = tflag = lflag = cflag = vflag = mflag = fflag = xflag = eflag =
 			kflag = bflag = Aflag = 1;
 

protocols/dwl-ipc-unstable-v2.xml

@@ -248,6 +248,27 @@ I would probably just submit raphi's patchset but I don't think that would be po
       <arg name="scalefactor" type="uint" summary="scale factor of monitor."/>
     </event>
 
+    <event name="window_info" since="2">
+      <description summary="Information about a window.">
+        Sent for each window when listing all windows.
+      </description>
+      <arg name="title" type="string" summary="Window title."/>
+      <arg name="appid" type="string" summary="Window app id."/>
+      <arg name="x" type="int" summary="X coordinate."/>
+      <arg name="y" type="int" summary="Y coordinate."/>
+      <arg name="width" type="int" summary="Width."/>
+      <arg name="height" type="int" summary="Height."/>
+      <arg name="floating" type="uint" summary="Is floating (1) or tiled (0)."/>
+      <arg name="fullscreen" type="uint" summary="Is fullscreen (1) or not (0)."/>
+      <arg name="tags" type="uint" summary="Tags bitmask."/>
+    </event>
+
+    <request name="list_windows" since="2">
+      <description summary="Request list of all windows">
+        Request the compositor to send window_info events for all windows.
+      </description>
+    </request>
+
   </interface>
 
 </protocol>

src/ext-protocol/dwl-ipc.h

@@ -28,6 +28,8 @@ static void dwl_ipc_output_dispatch(struct wl_client *client,
 									const char *dispatch, const char *arg1,
 									const char *arg2, const char *arg3,
 									const char *arg4, const char *arg5);
+static void dwl_ipc_output_list_windows(struct wl_client *client,
+										struct wl_resource *resource);
 static void dwl_ipc_output_release(struct wl_client *client,
 								   struct wl_resource *resource);
 
@@ -41,7 +43,8 @@ static struct zdwl_ipc_output_v2_interface dwl_output_implementation = {
 	.quit = dwl_ipc_output_quit,
 	.dispatch = dwl_ipc_output_dispatch,
 	.set_layout = dwl_ipc_output_set_layout,
-	.set_client_tags = dwl_ipc_output_set_client_tags};
+	.set_client_tags = dwl_ipc_output_set_client_tags,
+	.list_windows = dwl_ipc_output_list_windows};
 
 void dwl_ipc_manager_bind(struct wl_client *client, void *data,
 						  uint32_t version, uint32_t id) {
@@ -303,6 +306,33 @@ void dwl_ipc_output_dispatch(struct wl_client *client,
 		free(arg.v3);
 }
 
+void dwl_ipc_output_list_windows(struct wl_client *client,
+								 struct wl_resource *resource) {
+	Client *c = NULL;
+	const char *title, *appid;
+
+	wl_list_for_each(c, &clients, link) {
+		if (!client_surface(c)->mapped || client_is_unmanaged(c))
+			continue;
+
+		title = client_get_title(c);
+		appid = client_get_appid(c);
+
+		zdwl_ipc_output_v2_send_window_info(
+			resource,
+			title ? title : "",
+			appid ? appid : "",
+			c->geom.x,
+			c->geom.y,
+			c->geom.width,
+			c->geom.height,
+			c->isfloating,
+			c->isfullscreen,
+			c->tags);
+	}
+	wl_resource_post_event(resource, ZDWL_IPC_OUTPUT_V2_FRAME);
+}
+
 void dwl_ipc_output_release(struct wl_client *client,
 							struct wl_resource *resource) {
 	wl_resource_destroy(resource);