window urgency

[Duncaen]

quick draft of urgency support through serial-less xdg-activation. This PR adds an urgency boolean to windows and adds methods to set and get the urgency through the LayoutElement trait.
The next commit adds IPC events that indicate workspace urgency based on whether a window on the workspace has urgency, not sure if the IPC should also emit window events for that.

yambar patch:

From 90871daaac49fd87c29445b072ab7fc85d924eec Mon Sep 17 00:00:00 2001
From: Duncan Overbruck <[email protected]>
Date: Fri, 21 Mar 2025 18:12:18 +0100
Subject: [PATCH] add urgency tag to niri-workspaces

---
 modules/niri-common.c     | 23 +++++++++++++++++++++++
 modules/niri-common.h     |  2 ++
 modules/niri-workspaces.c |  5 +++--
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/modules/niri-common.c b/modules/niri-common.c
index ac53921..f380d85 100644
--- a/modules/niri-common.c
+++ b/modules/niri-common.c
@@ -12,6 +12,7 @@
 #include <unistd.h>
 
 #include "../log.h"
+#include "json_object.h"
 #include "niri-common.h"
 
 #define LOG_MODULE "niri:common"
@@ -82,6 +83,7 @@ parser(char *response)
                 ws->active = json_object_get_boolean(json_object_object_get(ws_obj, "is_active"));
                 ws->focused = json_object_get_boolean(json_object_object_get(ws_obj, "is_focused"));
                 ws->empty = json_object_get_int(json_object_object_get(ws_obj, "active_window_id")) == 0;
+                ws->urgent = json_object_get_boolean(json_object_object_get(ws_obj, "is_urgent"));
 
                 char const *name = json_object_get_string(json_object_object_get(ws_obj, "name"));
                 if (name)
@@ -185,6 +187,27 @@ parser(char *response)
             events |= keyboard_layouts_switched;
         }
 
+        // "WorkspaceUrgencyChanged": {
+        //   "id": 1,
+        //   "urgent": true
+        // }
+        else if (strcmp(key, "WorkspaceUrgencyChanged") == 0) {
+            json_object *obj = json_object_iter_peek_value(&it);
+            int id = json_object_get_int(json_object_object_get(obj, "id"));
+            bool urgent = json_object_get_boolean(json_object_object_get(obj, "urgent"));
+
+            tll_foreach(instance.workspaces, it)
+            {
+                if (it->item->id == id) {
+                    it->item->urgent = urgent;
+                    break;
+                }
+            }
+            mtx_unlock(&instance.mtx);
+
+            events |= workspace_urgency_changed;
+        }
+
         json_object_iter_next(&it);
     }
 
diff --git a/modules/niri-common.h b/modules/niri-common.h
index 18afe38..8aa2f39 100644
--- a/modules/niri-common.h
+++ b/modules/niri-common.h
@@ -10,6 +10,7 @@ enum niri_event {
     workspace_active_window_changed = (1 << 2),
     keyboard_layouts_changed = (1 << 3),
     keyboard_layouts_switched = (1 << 4),
+    workspace_urgency_changed = (1 << 5),
 };
 
 struct niri_subscriber {
@@ -24,6 +25,7 @@ struct niri_workspace {
     bool active;
     bool focused;
     bool empty;
+    bool urgent;
 };
 
 struct niri_socket {
diff --git a/modules/niri-workspaces.c b/modules/niri-workspaces.c
index bca0150..99a8c83 100644
--- a/modules/niri-workspaces.c
+++ b/modules/niri-workspaces.c
@@ -56,8 +56,9 @@ content(struct module *module)
                 tag_new_bool(module, "active", it->item->active),
                 tag_new_bool(module, "focused", it->item->focused),
                 tag_new_bool(module, "empty", it->item->empty),
+                tag_new_bool(module, "urgent", it->item->urgent),
             },
-            .count = 5,
+            .count = 6,
         };
 
         exposable[i++] = private->label->instantiate(private->label, &tags);
@@ -86,7 +87,7 @@ run(struct module *module)
     if (private->niri == NULL)
         return 1;
 
-    int fd = niri_socket_subscribe(workspaces_changed | workspace_activated | workspace_active_window_changed);
+    int fd = niri_socket_subscribe(workspaces_changed | workspace_activated | workspace_active_window_changed | workspace_urgency_changed);
     if (fd == -1) {
         niri_socket_close();
         return 1;
-- 
2.49.0

And a yambar configuration example:

  left:
    - niri-workspaces:
        content:
            map:
              default: {string: {text: "{id}", margin: 5}}
              conditions:
                urgent: {string: {text: "{id}", deco: {background: {color: af3029ff } }, margin: 5}}
                active: {string: {text: "{id}", deco: {background: {color: 383838ff } }, margin: 5}}

[FreeFull]

I think it would also be nice to have a niri action to set a specific window as urgent, similar to niri msg action focus-window --id <ID>