Add cpu frequency

include/modules/cpu.hpp

@@ -22,7 +22,9 @@ class Cpu : public ALabel {
  private:
   uint16_t                                getCpuLoad();
   std::tuple<uint16_t, std::string>       getCpuUsage();
+  std::tuple<float, float, float>         getCpuFrequency();
   std::vector<std::tuple<size_t, size_t>> parseCpuinfo();
+  std::vector<float>                      parseCpuFrequencies();
 
   std::vector<std::tuple<size_t, size_t>> prev_times_;
 

man/waybar-cpu.5.scd

@@ -79,6 +79,12 @@ The *cpu* module displays the current cpu utilization.
 
 *{usage}*: Current cpu usage.
 
+*{avg_frequency}*: Current cpu average frequency (based on all cores) in GHz.
+
+*{max_frequency}*: Current cpu max frequency (based on the core with the highest frequency) in GHz.
+
+*{min_frequency}*: Current cpu min frequency (based on the core with the lowest frequency) in GHz.
+
 # EXAMPLE
 
 ```

src/modules/cpu/bsd.cpp

@@ -95,3 +95,7 @@ std::vector<std::tuple<size_t, size_t>> waybar::modules::Cpu::parseCpuinfo() {
   free(cp_time);
   return cpuinfo;
 }
+
+std::vector<float> waybar::modules::Cpu::parseCpuFrequencies() {
+  throw std::runtime_error("Cpu frequency is not implemented on BSD.");
+}

src/modules/cpu/common.cpp

@@ -12,6 +12,7 @@ auto waybar::modules::Cpu::update() -> void {
   // TODO: as creating dynamic fmt::arg arrays is buggy we have to calc both
   auto cpu_load = getCpuLoad();
   auto [cpu_usage, tooltip] = getCpuUsage();
+  auto [max_frequency, min_frequency, avg_frequency] = getCpuFrequency();
   if (tooltipEnabled()) {
     label_.set_tooltip_text(tooltip);
   }
@@ -25,7 +26,12 @@ auto waybar::modules::Cpu::update() -> void {
     event_box_.hide();
   } else {
     event_box_.show();
-    label_.set_markup(fmt::format(format, fmt::arg("load", cpu_load), fmt::arg("usage", cpu_usage)));
+    label_.set_markup(fmt::format(format,
+                                  fmt::arg("load", cpu_load),
+                                  fmt::arg("usage", cpu_usage),
+                                  fmt::arg("max_frequency", max_frequency),
+                                  fmt::arg("min_frequency", min_frequency),
+                                  fmt::arg("avg_frequency", avg_frequency)));
   }
 
   // Call parent update
@@ -64,3 +70,16 @@ std::tuple<uint16_t, std::string> waybar::modules::Cpu::getCpuUsage() {
   prev_times_ = curr_times;
   return {usage, tooltip};
 }
+
+std::tuple<float, float, float> waybar::modules::Cpu::getCpuFrequency() {
+  std::vector<float> frequencies = parseCpuFrequencies();
+  auto [min, max] = std::minmax_element(std::begin(frequencies), std::end(frequencies));
+  float avg_frequency = std::accumulate(std::begin(frequencies), std::end(frequencies), 0.0) / frequencies.size();
+
+  // Round frequencies with double decimal precision to get GHz
+  float max_frequency = std::ceil(*max / 10.0) / 100.0;
+  float min_frequency = std::ceil(*min / 10.0) / 100.0;
+  avg_frequency = std::ceil(avg_frequency / 10.0) / 100.0;
+
+  return { max_frequency, min_frequency, avg_frequency };
+}

src/modules/cpu/linux.cpp

@@ -27,3 +27,24 @@ std::vector<std::tuple<size_t, size_t>> waybar::modules::Cpu::parseCpuinfo() {
   }
   return cpuinfo;
 }
+
+std::vector<float> waybar::modules::Cpu::parseCpuFrequencies() {
+  const std::string file_path_ = "/proc/cpuinfo";
+  std::ifstream info(file_path_);
+  if (!info.is_open()) {
+    throw std::runtime_error("Can't open " + file_path_);
+  }
+  std::vector<float> frequencies;
+  std::string line;
+  while (getline(info, line)) {
+    if (line.substr(0, 7).compare("cpu MHz") != 0) {
+      continue;
+    }
+
+    std::string frequency_str = line.substr(line.find(":") + 2);
+    float frequency = std::strtol(frequency_str.c_str(), nullptr, 10);
+    frequencies.push_back(frequency);
+  }
+  info.close();
+  return frequencies;
+}