Add temperature module

src/factory.cpp

@@ -56,6 +56,9 @@ waybar::IModule* waybar::Factory::makeModule(const std::string &name) const
       return new waybar::modules::Pulseaudio(id, config_[name]);
     }
     #endif
+    if (ref == "temperature") {
+      return new waybar::modules::Temperature(id, config_[name]);
+    }
     if (ref.compare(0, 7, "custom/") == 0 && ref.size() > 7) {
       return new waybar::modules::Custom(ref.substr(7), config_[name]);
     }

src/modules/temperature.cpp

@@ -0,0 +1,60 @@
+#include "modules/temperature.hpp"
+
+waybar::modules::Temperature::Temperature(const std::string& id, const Json::Value& config)
+  : ALabel(config, "{temperatureC}°C", 10)
+{
+  if (config_["hwmon-path"].isString()) {
+    file_path_ = config_["hwmon-path"].asString();
+  } else {
+    auto zone =
+      config_["thermal-zone"].isInt() ? config_["thermal-zone"].asInt() : 1;
+    file_path_ = fmt::format("/sys/class/thermal/thermal_zone{}/temp", zone);
+  }
+
+  label_.set_name("temperature");
+  if (!id.empty()) {
+    label_.get_style_context()->add_class(id);
+  }
+  thread_ = [this] {
+    dp.emit();
+    thread_.sleep_for(interval_);
+  };
+}
+
+auto waybar::modules::Temperature::update() -> void
+{
+  auto [temperature_c, temperature_f] = getTemperature();
+  auto critical = isCritical(temperature_c);
+  auto format = format_;
+  if (critical) {
+    format =
+      config_["format-critical"].isString() ? config_["format-critical"].asString() : format;
+    label_.get_style_context()->add_class("critical");
+  } else {
+    label_.get_style_context()->remove_class("critical");
+  }
+  label_.set_markup(fmt::format(format,
+    fmt::arg("temperatureC", temperature_c), fmt::arg("temperatureF", temperature_f)));
+}
+
+std::tuple<uint16_t, uint16_t> waybar::modules::Temperature::getTemperature()
+{
+  std::ifstream temp(file_path_);
+  if (!temp.is_open()) {
+    throw std::runtime_error("Can't open " + file_path_);
+  }
+  std::string line;
+  if (temp.good()) {
+    getline(temp, line);
+  }
+  temp.close();
+  auto temperature_c = std::strtol(line.c_str(), nullptr, 10) / 1000.0;
+  auto temperature_f = temperature_c * 1.8 + 32;
+  std::tuple<uint16_t, uint16_t> temperatures(std::round(temperature_c), std::round(temperature_f));
+  return temperatures;
+}
+
+bool waybar::modules::Temperature::isCritical(uint16_t temperature_c)
+{
+  return config_["critical-threshold"].isInt() && temperature_c >= config_["critical-threshold"].asInt();
+}