river/mode: new module

This module shows river's current mapping mode (e.g. normal, locked).

include/modules/river/mode.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <wayland-client.h>
+
+#include "ALabel.hpp"
+#include "bar.hpp"
+#include "river-status-unstable-v1-client-protocol.h"
+
+namespace waybar::modules::river {
+
+class Mode : public waybar::ALabel {
+ public:
+  Mode(const std::string &, const waybar::Bar &, const Json::Value &);
+  ~Mode();
+
+  // Handlers for wayland events
+  void handle_mode(const char *mode);
+
+  struct zriver_status_manager_v1 *status_manager_;
+  struct wl_seat *seat_;
+
+ private:
+  const waybar::Bar &bar_;
+  std::string mode_;
+  struct zriver_seat_status_v1 *seat_status_;
+};
+
+} /* namespace waybar::modules::river */