get kb meesage by ipc

mmsg/mmsg.c

@@ -265,6 +265,17 @@ static void dwl_ipc_output_kb_layout(void *data,
 	printf("kb_layout %s\n", kb_layout);
 }
 
+static void dwl_ipc_output_active_kb(void *data,
+									 struct zdwl_ipc_output_v2 *dwl_ipc_output,
+									 const char *active_kb) {
+	if (!kflag)
+		return;
+	char *output_name = data;
+	if (output_name)
+		printf("%s ", output_name);
+	printf("active_kb %s\n", active_kb);
+}
+
 static void
 dwl_ipc_output_scalefactor(void *data,
 						   struct zdwl_ipc_output_v2 *dwl_ipc_output,
@@ -425,6 +436,7 @@ static const struct zdwl_ipc_output_v2_listener dwl_ipc_output_listener = {
 	.height = dwl_ipc_output_height,
 	.last_layer = dwl_ipc_output_last_layer,
 	.kb_layout = dwl_ipc_output_kb_layout,
+	.active_kb = dwl_ipc_output_active_kb,
 	.keymode = dwl_ipc_output_keymode,
 	.scalefactor = dwl_ipc_output_scalefactor,
 	.frame = dwl_ipc_output_frame,

protocols/dwl-ipc-unstable-v2.xml

@@ -234,6 +234,13 @@ I would probably just submit raphi's patchset but I don't think that would be po
       <arg name="kb_layout" type="string" summary="current keyboard layout."/>
     </event>
 
+      <event name="active_kb" since="2">
+      <description summary="current active keyboard.">
+        current active keyboard.
+      </description>
+      <arg name="active_kb" type="string" summary="current active keyboard."/>
+    </event>
+
     <event name="keymode" since="2">
       <description summary="current keybind mode.">
         current keybind mode.

src/ext-protocol/dwl-ipc.h

@@ -114,7 +114,9 @@ void dwl_ipc_output_printstatus_to(DwlIpcOutput *ipc_output) {
 	xkb_layout_index_t current;
 	int32_t tagmask, state, numclients, focused_client, tag;
 	const char *title, *appid, *symbol;
+	InputDevice *active_kb;
 	char kb_layout[32];
+	char active_kb_name[256];
 	focused = focustop(monitor);
 	zdwl_ipc_output_v2_send_active(ipc_output->resource, monitor == selmon);
 
@@ -147,12 +149,21 @@ void dwl_ipc_output_printstatus_to(DwlIpcOutput *ipc_output) {
 		symbol = monitor->pertag->ltidxs[monitor->pertag->curtag]->symbol;
 	}
 
-	keyboard = &kb_group->wlr_group->keyboard;
+	active_kb = get_active_keyboard_device();
+	if(active_kb) {
+		sprintf(active_kb_name, "vendor:%d,product:%d,name:%s", active_kb->vendor, active_kb->product, active_kb->name);
+	} else {
+		sprintf(active_kb_name, "-1 -1 unknown");
+	}
+
+
+	keyboard = active_kb ? (struct wlr_keyboard*)active_kb->device_data:  &kb_group->wlr_group->keyboard;
 	current = xkb_state_serialize_layout(keyboard->xkb_state,
 										 XKB_STATE_LAYOUT_EFFECTIVE);
 	get_layout_abbr(kb_layout,
 					xkb_keymap_layout_get_name(keyboard->keymap, current));
 
+
 	zdwl_ipc_output_v2_send_layout(
 		ipc_output->resource,
 		monitor->pertag->ltidxs[monitor->pertag->curtag] - layouts);
@@ -210,6 +221,10 @@ void dwl_ipc_output_printstatus_to(DwlIpcOutput *ipc_output) {
 		zdwl_ipc_output_v2_send_scalefactor(ipc_output->resource,
 											monitor->wlr_output->scale * 100);
 	}
+	if (wl_resource_get_version(ipc_output->resource) >=
+		ZDWL_IPC_OUTPUT_V2_ACTIVE_KB_SINCE_VERSION) {
+		zdwl_ipc_output_v2_send_active_kb(ipc_output->resource, active_kb_name);
+	}
 
 	zdwl_ipc_output_v2_send_frame(ipc_output->resource);
 }

src/mango.c

@@ -786,6 +786,7 @@ static Client *get_scroll_stack_head(Client *c);
 static bool client_only_in_one_tag(Client *c);
 static Client *get_focused_stack_client(Client *sc);
 static bool client_is_in_same_stack(Client *sc, Client *tc, Client *fc);
+static InputDevice * get_active_keyboard_device(void);
 
 #include "data/static_keymap.h"
 #include "dispatch/bind_declare.h"
@@ -2577,12 +2578,11 @@ void createkeyboard(struct wlr_keyboard *keyboard) {
 		int32_t vendor = libinput_device_get_id_vendor(device);
 		int32_t product = libinput_device_get_id_product(device);
 		const char *name = libinput_device_get_name(device);
+		name = name ? name : "unknown";
 
-		if (name) {
 		input_dev->vendor = vendor;
 		input_dev->product = product;
 		input_dev->name = strdup(name);
-		}
 
 		input_dev->destroy_listener.notify = destroyinputdevice;
 		wl_signal_add(&keyboard->base.events.destroy,