feat: cpu module

src/modules/cpu.cpp

@@ -0,0 +1,20 @@
+#include "modules/cpu.hpp"
+#include <iostream>
+
+waybar::modules::Cpu::Cpu()
+{
+  _label.get_style_context()->add_class("cpu-widget");
+  _thread = [this] {
+    struct sysinfo info;
+    if (!sysinfo(&info)) {
+      float f_load = 1.f / (1 << SI_LOAD_SHIFT);
+      _label.set_text(fmt::format("{:.{}f}% ",
+      	info.loads[0] * f_load * 100 / get_nprocs(), 1));
+    }
+    _thread.sleep_for(chrono::seconds(30));
+  };
+};
+
+waybar::modules::Cpu::operator Gtk::Widget &() {
+  return _label;
+}