Merge pull request #2852 from dpayne/add_css_reload

Adding css reloader

include/client.hpp

@@ -7,6 +7,7 @@
 
 #include "bar.hpp"
 #include "config.hpp"
+#include "util/css_reload_helper.hpp"
 #include "util/portal.hpp"
 
 struct zwlr_layer_shell_v1;
@@ -55,6 +56,8 @@ class Client {
   Glib::RefPtr<Gtk::CssProvider> css_provider_;
   std::unique_ptr<Portal> portal;
   std::list<struct waybar_output> outputs_;
+  std::unique_ptr<CssReloadHelper> m_cssReloadHelper;
+  std::string m_cssFile;
 };
 
 }  // namespace waybar

include/util/css_reload_helper.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <functional>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "giomm/file.h"
+#include "giomm/filemonitor.h"
+#include "glibmm/refptr.h"
+
+struct pollfd;
+
+namespace waybar {
+class CssReloadHelper {
+ public:
+  CssReloadHelper(std::string cssFile, std::function<void()> callback);
+
+  virtual void monitorChanges();
+
+ protected:
+  std::vector<std::string> parseImports(const std::string& cssFile);
+
+  void parseImports(const std::string& cssFile, std::unordered_map<std::string, bool>& imports);
+
+  void watchFiles(const std::vector<std::string>& files);
+
+  bool handleInotifyEvents(int fd);
+
+  bool watch(int inotifyFd, pollfd* pollFd);
+
+  virtual std::string getFileContents(const std::string& filename);
+
+  virtual std::string findPath(const std::string& filename);
+
+  void handleFileChange(Glib::RefPtr<Gio::File> const& file,
+                        Glib::RefPtr<Gio::File> const& other_type,
+                        Gio::FileMonitorEvent event_type);
+
+ private:
+  std::string m_cssFile;
+
+  std::function<void()> m_callback;
+
+  std::vector<std::tuple<Glib::RefPtr<Gio::FileMonitor>>> m_fileMonitors;
+};
+}  // namespace waybar