feat: basic line graph component and cpu graph module

include/AGraph.hpp

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <glibmm/markup.h>
+#include <gtkmm/label.h>
+#include <json/json.h>
+
+#include <deque>
+#include <vector>
+
+#include "AModule.hpp"
+
+namespace waybar {
+
+class AGraph : public AModule {
+ public:
+  AGraph(const Json::Value &, const std::string &, const std::string &,
+         uint16_t interval = 0, bool enable_click = false,
+         bool enable_scroll = false);
+  virtual ~AGraph() = default;
+  auto update() -> void override;
+
+ protected:
+  Gtk::DrawingArea graph_;
+  std::deque<int> values_;
+  uint16_t datapoints_ = 20;
+  uint16_t y_offset_ = 0;
+
+  void addValue(const int n);
+
+  const std::chrono::seconds interval_;
+
+  bool onDraw(const Cairo::RefPtr<Cairo::Context> &cr);
+
+  std::map<std::string, GtkMenuItem *> submenus_;
+  std::map<std::string, std::string> menuActionsMap_;
+  static void handleGtkMenuEvent(GtkMenuItem *menuitem, gpointer data);
+
+ private:
+  void drawFilledArea(const Cairo::RefPtr<Cairo::Context> &cr,
+                      const std::vector<std::pair<double, double>> &points,
+                      double height, const Gdk::RGBA &bg_color);
+
+  void drawLine(const Cairo::RefPtr<Cairo::Context> &cr,
+                const std::vector<std::pair<double, double>> &points, const Gdk::RGBA &fg_color);
+
+  void drawPath(const Cairo::RefPtr<Cairo::Context> &cr,
+                const std::vector<std::pair<double, double>> &points);
+};
+
+}  // namespace waybar

include/modules/cpu_graph.hpp

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <fmt/format.h>
+
+#include <cstdint>
+#include <fstream>
+#include <numeric>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "AGraph.hpp"
+#include "util/sleeper_thread.hpp"
+
+namespace waybar::modules {
+
+class CpuGraph : public AGraph {
+ public:
+  CpuGraph(const std::string&, const Json::Value&);
+  virtual ~CpuGraph() = default;
+  auto update() -> void override;
+
+ private:
+  static constexpr const char *MODERATE_CLASS = "cpu-moderate";
+  static constexpr const char *HIGH_CLASS = "cpu-high";
+  static constexpr const char *INTENSIVE_CLASS = "cpu-intensive";
+
+  std::vector<std::tuple<size_t, size_t>> prev_times_;
+  util::SleeperThread thread_;
+};
+
+}  // namespace waybar::modules