Waybar/src/modules/cpu.cpp

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#include "modules/cpu.hpp"
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waybar::modules::Cpu::Cpu(const Json::Value& config)
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: ALabel(config, "{}%")
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{
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label_.set_name("cpu");
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uint32_t interval = config_["interval"].isUInt() ? config_["interval"].asUInt() : 10;
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thread_ = [this, interval] {
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dp.emit();
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thread_.sleep_for(chrono::seconds(interval));
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};
}
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auto waybar::modules::Cpu::update() -> void
{
if (prevTimes_.size() < 1) {
prevTimes_ = parseCpuinfo();
std::this_thread::sleep_for(chrono::milliseconds(100));
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}
std::vector< std::tuple<size_t, size_t> > currTimes = parseCpuinfo();
std::string tooltip;
for (size_t i = 0; i < currTimes.size(); ++i) {
auto [currIdle, currTotal] = currTimes[i];
auto [prevIdle, prevTotal] = prevTimes_[i];
const float deltaIdle = currIdle - prevIdle;
const float deltaTotal = currTotal - prevTotal;
uint16_t load = 100 * (1 - deltaIdle / deltaTotal);
if (i == 0) {
label_.set_text(fmt::format(format_, load));
tooltip = fmt::format("Total: {}%", load);
} else {
tooltip = tooltip + fmt::format("\nCore{}: {}%", i - 1, load);
}
}
label_.set_tooltip_text(tooltip);
prevTimes_ = currTimes;
}
std::vector< std::tuple<size_t, size_t> > waybar::modules::Cpu::parseCpuinfo()
{
std::ifstream info(data_dir_);
if (!info.is_open()) {
throw std::runtime_error("Can't open " + data_dir_);
}
std::vector< std::tuple<size_t, size_t> > cpuinfo;
std::string line;
while (getline(info, line)) {
if (line.substr(0,3).compare("cpu") != 0) {
break;
}
std::stringstream sline(line.substr(5));
std::vector<size_t> times;
for (size_t time; sline >> time; times.push_back(time));
size_t idle_time = 0;
size_t total_time = 0;
if (times.size() >= 4) {
idle_time = times[3];
total_time = std::accumulate(times.begin(), times.end(), 0);
}
cpuinfo.push_back( {idle_time, total_time} );
}
return cpuinfo;
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}