waybar/src/modules/cpu.cpp
2018-12-18 17:30:54 +01:00

89 lines
2.5 KiB
C++

#include "modules/cpu.hpp"
waybar::modules::Cpu::Cpu(const std::string& id, const Json::Value& config)
: ALabel(config, "{usage}%", 10)
{
label_.set_name("cpu");
if (!id.empty()) {
label_.get_style_context()->add_class(id);
}
thread_ = [this] {
dp.emit();
thread_.sleep_for(interval_);
};
}
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();
label_.set_tooltip_text(tooltip);
label_.set_markup(fmt::format(format_,
fmt::arg("load", cpu_load), fmt::arg("usage", cpu_usage)));
}
uint16_t waybar::modules::Cpu::getCpuLoad()
{
struct sysinfo info = {0};
if (sysinfo(&info) == 0) {
float f_load = 1.f / (1u << SI_LOAD_SHIFT);
uint16_t load = info.loads[0] * f_load * 100 / get_nprocs();
return load;
}
throw std::runtime_error("Can't get Cpu load");
}
std::tuple<uint16_t, std::string> waybar::modules::Cpu::getCpuUsage()
{
if (prev_times_.empty()) {
prev_times_ = parseCpuinfo();
std::this_thread::sleep_for(chrono::milliseconds(100));
}
std::vector<std::tuple<size_t, size_t>> curr_times = parseCpuinfo();
std::string tooltip;
uint16_t usage = 0;
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;
uint16_t tmp = 100 * (1 - delta_idle / delta_total);
if (i == 0) {
usage = tmp;
tooltip = fmt::format("Total: {}%", tmp);
} else {
tooltip = tooltip + fmt::format("\nCore{}: {}%", i - 1, tmp);
}
}
prev_times_ = curr_times;
return {usage, tooltip};
}
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;
}