Waybar/src/modules/cpu/common.cpp

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#include "modules/cpu.hpp"
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waybar::modules::Cpu::Cpu(const std::string& id, const Json::Value& config)
: ALabel(config, "cpu", id, "{usage}%", 10) {
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thread_ = [this] {
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dp.emit();
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thread_.sleep_for(interval_);
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};
}
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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();
if (tooltipEnabled()) {
label_.set_tooltip_text(tooltip);
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}
auto format = format_;
auto state = getState(cpu_usage);
if (!state.empty() && config_["format-" + state].isString()) {
format = config_["format-" + state].asString();
}
if (format.empty()) {
event_box_.hide();
} else {
event_box_.show();
label_.set_markup(fmt::format(format, fmt::arg("load", cpu_load), fmt::arg("usage", cpu_usage)));
}
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// Call parent update
ALabel::update();
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}
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uint16_t waybar::modules::Cpu::getCpuLoad() {
double load[1];
if (getloadavg(load, 1) != -1) {
return load[0] * 100 / sysconf(_SC_NPROCESSORS_ONLN);
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}
throw std::runtime_error("Can't get Cpu load");
}
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std::tuple<uint16_t, std::string> waybar::modules::Cpu::getCpuUsage() {
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if (prev_times_.empty()) {
prev_times_ = parseCpuinfo();
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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}
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std::vector<std::tuple<size_t, size_t>> curr_times = parseCpuinfo();
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std::string tooltip;
uint16_t usage = 0;
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for (size_t i = 0; i < curr_times.size(); ++i) {
auto [curr_idle, curr_total] = curr_times[i];
auto [prev_idle, prev_total] = prev_times_[i];
const float delta_idle = curr_idle - prev_idle;
const float delta_total = curr_total - prev_total;
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uint16_t tmp = 100 * (1 - delta_idle / delta_total);
if (i == 0) {
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usage = tmp;
tooltip = fmt::format("Total: {}%", tmp);
} else {
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tooltip = tooltip + fmt::format("\nCore{}: {}%", i - 1, tmp);
}
}
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prev_times_ = curr_times;
return {usage, tooltip};
}