Display instance (if present) in nested layouts

sway/border.c

@@ -221,6 +221,25 @@ static void render_title_bar(swayc_t *view, cairo_t *cr, struct wlc_geometry *b,
 	}
 }
 
+/**
+ * Generate window title for tabbed/stacked layouts
+ */
+static char *generate_view_title(swayc_t *view) {
+	char *title;
+	size_t len;
+	if (view->app_id) {
+		return strdup(view->app_id);
+	} else if (view->class && view->instance) {
+		len = strlen(view->class) + strlen(view->instance) + 3;
+		title = calloc(len + 1, 1);
+		snprintf(title, len, "%s - %s", view->instance, view->class);
+		return title;
+	} else if (view->class) {
+		return strdup(view->class);
+	}
+	return strdup("(null)");
+}
+
 /**
  * Generate nested container title for tabbed/stacked layouts
  */
@@ -252,9 +271,9 @@ static char *generate_container_title(swayc_t *container) {
 	for (i = 0; i < container->children->length; ++i) {
 		prev_name = name;
 		swayc_t* child = container->children->items[i];
-		const char *title = NULL;
+		char *title = NULL;
 		if (child->type == C_VIEW) {
-			title = child->app_id ? child->app_id : (child->class ? child->class : "(null)");
+			title = generate_view_title(child);
 		} else { //child->type == C_CONTAINER
 			title = generate_container_title(child);
 		}
@@ -267,6 +286,9 @@ static char *generate_container_title(swayc_t *container) {
 		name = malloc(len * sizeof(char));
 		if (!name) {
 			free(prev_name);
+			if (child->type == C_VIEW) {
+				free(title);
+			}
 			sway_log(L_ERROR, "Unable to allocate container title");
 			return NULL;
 		}
@@ -275,6 +297,9 @@ static char *generate_container_title(swayc_t *container) {
 		} else {
 			snprintf(name, len, "%s%s", prev_name, title);
 		}
+		if (child->type == C_VIEW) {
+			free(title);
+		}
 		free(prev_name);
 	}