feat(niri/workspaces): hide-empty

man/waybar-niri-workspaces.5.scd

@@ -17,6 +17,11 @@ Addressed by *niri/workspaces*
 	default: false ++
 	If set to false, workspaces will only be shown on the output they are on. If set to true all workspaces will be shown on every output.
 
+*hide-empty*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true, workspaces will only be shown if they are nonempty (or focused).
+
 *format*: ++
 	typeof: string ++
 	default: {value} ++

src/modules/niri/workspaces.cpp

@@ -33,10 +33,13 @@ void Workspaces::doUpdate() {
   auto ipcLock = gIPC->lockData();
 
   const auto alloutputs = config_["all-outputs"].asBool();
+  const auto hide_empty = config_["hide-empty"].asBool();
   std::vector<Json::Value> my_workspaces;
   const auto& workspaces = gIPC->workspaces();
   std::copy_if(workspaces.cbegin(), workspaces.cend(), std::back_inserter(my_workspaces),
                [&](const auto& ws) {
+                 if (hide_empty && ws["active_window_id"].isNull() && !ws["is_focused"].asBool())
+                   return false;
                  if (alloutputs) return true;
                  return ws["output"].asString() == bar_.output->name;
                });