waybar/src/modules/battery.cpp

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#include "modules/battery.hpp"
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waybar::modules::Battery::Battery(const Json::Value& config)
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: ALabel(config, "{capacity}%")
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{
try {
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for (auto const& node : fs::directory_iterator(data_dir_)) {
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if (fs::is_directory(node) && fs::exists(node / "capacity")
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&& fs::exists(node / "status") && fs::exists(node / "uevent")) {
batteries_.push_back(node);
}
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}
} catch (fs::filesystem_error &e) {
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throw std::runtime_error(e.what());
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}
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if (batteries_.empty()) {
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throw std::runtime_error("No batteries.");
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}
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fd_ = inotify_init1(IN_CLOEXEC);
if (fd_ == -1) {
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throw std::runtime_error("Unable to listen batteries.");
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}
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for (auto const& bat : batteries_) {
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inotify_add_watch(fd_, (bat / "uevent").c_str(), IN_ACCESS);
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}
label_.set_name("battery");
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worker();
}
waybar::modules::Battery::~Battery()
{
close(fd_);
}
void waybar::modules::Battery::worker()
{
// Trigger first values
update();
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thread_ = [this] {
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struct inotify_event event = {0};
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int nbytes = read(fd_, &event, sizeof(event));
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if (nbytes != sizeof(event)) {
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return;
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}
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dp.emit();
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};
}
auto waybar::modules::Battery::update() -> void
{
try {
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uint16_t total = 0;
std::string status;
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for (auto const& bat : batteries_) {
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uint16_t capacity;
std::string _status;
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std::ifstream(bat / "capacity") >> capacity;
std::ifstream(bat / "status") >> _status;
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if (_status != "Unknown") {
status = _status;
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}
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total += capacity;
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}
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uint16_t capacity = total / batteries_.size();
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label_.set_text(fmt::format(format_, fmt::arg("capacity", capacity),
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fmt::arg("icon", getIcon(capacity))));
label_.set_tooltip_text(status);
bool charging = status == "Charging";
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if (charging) {
label_.get_style_context()->add_class("charging");
} else {
label_.get_style_context()->remove_class("charging");
}
auto critical = config_["critical"] ? config_["critical"].asUInt() : 15;
if (capacity <= critical && !charging) {
label_.get_style_context()->add_class("warning");
} else {
label_.get_style_context()->remove_class("warning");
}
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} catch (const std::exception& e) {
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std::cerr << e.what() << std::endl;
}
}