Add mmsg rename tag IPC message

* Add mmsg rename tag IPC message for renaming tags

docs/ipc.md

@@ -67,6 +67,17 @@ mmsg watch all-monitors
 mmsg watch all-tags
 ```
 
+### RENAME
+| Command | Description |
+| :--- | :--- |
+| `rename tag <index> <name>` | Renames a tag at runtime. Updates the in-memory config, the ext-workspace-v1 protocol name, and notifies all IPC watchers. The name may contain spaces. |
+
+*Example:*
+```bash
+mmsg rename tag 1 web
+mmsg rename tag 2 my projects
+```
+
 ### DISPATCH
 Allows sending commands to the compositor to alter its state.
 * `dispatch <func_name>,[args...] [client,<id>]`

mmsg/mmsg.1

@@ -74,6 +74,24 @@ Examples:
 .IP \(bu 2
 \fBmmsg dispatch movewin,10,100 client,4\fR
 .RE
+.SS "Rename commands"
+.TP
+\fBrename tag\fR <index> <name>
+Rename a tag at runtime.
+\fIindex\fR is the 1-based tag number.
+\fIname\fR may contain spaces.
+The change is reflected immediately in the ext-workspace-v1 protocol and in all
+active IPC watch streams.
+Survives \fBreload_config\fR only if also set via \fBtagrule=id:<index>,name:<name>\fR
+in the config file.
+.br
+Example:
+.RS
+.IP \(bu 2
+\fBmmsg rename tag 1 web\fR
+.IP \(bu 2
+\fBmmsg rename tag 2 my projects\fR
+.RE
 .SS "Persistent streams (watch)"
 \fBWatch\fR commands keep the connection open and continuously output JSON
 updates. The initial state is sent immediately, followed by updates whenever

src/ext-protocol/ext-workspace.h

@@ -155,6 +155,8 @@ void dwl_ext_workspace_printstatus(Monitor *m) {
 	wl_list_for_each(w, &workspaces, link) {
 		if (w && w->m == m) {
 
+			wlr_ext_workspace_handle_v1_set_name(w->ext_workspace,
+				get_name_from_tag(w->tag));
 			tag_status = get_tag_status(w->tag, m);
 			if (tag_status == 2) {
 				wlr_ext_workspace_handle_v1_set_hidden(w->ext_workspace, false);

src/ipc/ipc.h

@@ -352,6 +352,41 @@ static void handle_command(int client_fd, const char *cmd_raw) {
 			return;
 		}
 		resp = build_monitor_tags_response(m);
+	} else if (strncmp(cmd, "rename tag ", 11) == 0) {
+		char *rest = (char *)(cmd + 11);
+		char *endptr;
+		long tag_index = strtol(rest, &endptr, 10);
+		if (endptr == rest || *endptr != ' ' ||
+				tag_index < 1 || tag_index > (int)LENGTH(tags)) {
+			send_static_json(client_fd, "{\"error\":\"usage: rename tag <index> <name>\"}\n");
+			return;
+		}
+		const char *new_name = endptr + 1;
+		if (*new_name == '\0') {
+			send_static_json(client_fd, "{\"error\":\"usage: rename tag <index> <name>\"}\n");
+			return;
+		}
+		bool found = false;
+		for (int i = 0; i < config.tag_rules_count; i++) {
+			if (config.tag_rules[i].id == (int)tag_index) {
+				free(config.tag_rules[i].name);
+				config.tag_rules[i].name = strdup(new_name);
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			config.tag_rules = realloc(config.tag_rules,
+				(config.tag_rules_count + 1) * sizeof(ConfigTagRule));
+			ConfigTagRule *rule = &config.tag_rules[config.tag_rules_count];
+			memset(rule, 0, sizeof(ConfigTagRule));
+			rule->id = (int)tag_index;
+			rule->name = strdup(new_name);
+			config.tag_rules_count++;
+		}
+		printstatus(IPC_WATCH_ARRANGGE);
+		resp = cJSON_CreateObject();
+		cJSON_AddBoolToObject(resp, "success", true);
 	} else if (strncmp(cmd, "dispatch ", 9) == 0) {
 		char *dispatch_copy = strdup(cmd_raw + 9);
 		char *out = dispatch_copy, *ptr = dispatch_copy;