wlr/taskbar: add truncate to ellipsize long button text

man/waybar-wlr-taskbar.5.scd

@@ -84,6 +84,11 @@ Addressed by *wlr/taskbar*
 	default: false ++
 	If set to true, task buttons stretch to fill the available space in the taskbar and long titles are ellipsized to fit. Only takes effect on a horizontal bar; on a vertical bar the buttons keep their content-based size. If set to false, buttons are sized to their content.
 
+*truncate*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true, the task button text will be ellipsized (truncated with …) when the available button width is smaller than the label text.
+
 *on-click*: ++
 	typeof: string ++
 	The action which should be triggered when clicking on the application button with the left mouse button.

src/modules/wlr/taskbar.cpp

@@ -138,6 +138,17 @@ Task::Task(const waybar::Bar& bar, const Json::Value& config, Taskbar* tbar,
   content_.show();
   button.add(content_);
 
+  // Apply optional label truncation (ellipsize).
+  if (config_["truncate"].isBool() && config_["truncate"].asBool()) {
+    text_before_.set_single_line_mode(true);
+    text_before_.set_ellipsize(Pango::ELLIPSIZE_END);
+    text_before_.set_line_wrap(false);
+
+    text_after_.set_single_line_mode(true);
+    text_after_.set_ellipsize(Pango::ELLIPSIZE_END);
+    text_after_.set_line_wrap(false);
+  }
+
   format_before_.clear();
   format_after_.clear();