Add niri/workspaces, niri/window, niri/language

include/modules/niri/backend.hpp

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <list>
+#include <mutex>
+#include <string>
+#include <utility>
+
+#include "util/json.hpp"
+
+namespace waybar::modules::niri {
+
+class EventHandler {
+ public:
+  virtual void onEvent(const Json::Value& ev) = 0;
+  virtual ~EventHandler() = default;
+};
+
+class IPC {
+ public:
+  IPC() { startIPC(); }
+
+  void registerForIPC(const std::string& ev, EventHandler* ev_handler);
+  void unregisterForIPC(EventHandler* handler);
+
+  static Json::Value send(const Json::Value& request);
+
+  // The data members are only safe to access while dataMutex_ is locked.
+  std::lock_guard<std::mutex> lockData() { return std::lock_guard(dataMutex_); }
+  const std::vector<Json::Value> &workspaces() const { return workspaces_; }
+  const std::vector<Json::Value> &windows() const { return windows_; }
+  const std::vector<std::string> &keyboardLayoutNames() const { return keyboardLayoutNames_; }
+  unsigned keyboardLayoutCurrent() const { return keyboardLayoutCurrent_; }
+
+ private:
+  void startIPC();
+  static int connectToSocket();
+  void parseIPC(const std::string&);
+
+  std::mutex dataMutex_;
+  std::vector<Json::Value> workspaces_;
+  std::vector<Json::Value> windows_;
+  std::vector<std::string> keyboardLayoutNames_;
+  unsigned keyboardLayoutCurrent_;
+
+  util::JsonParser parser_;
+  std::mutex callbackMutex_;
+  std::list<std::pair<std::string, EventHandler*>> callbacks_;
+};
+
+inline std::unique_ptr<IPC> gIPC;
+
+};  // namespace waybar::modules::niri