Waybar/src/modules/battery.cpp

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#include "modules/battery.hpp"
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waybar::modules::Battery::Battery(Json::Value config)
: ALabel(std::move(config))
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{
try {
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for (auto &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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}
for (auto &bat : batteries_) {
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inotify_add_watch(fd_, (bat / "uevent").c_str(), IN_ACCESS);
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}
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// Trigger first values
update();
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label_.set_name("battery");
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thread_.sig_update.connect(sigc::mem_fun(*this, &Battery::update));
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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thread_.sig_update.emit();
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};
}
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waybar::modules::Battery::~Battery()
{
close(fd_);
}
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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 &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();
auto format = config_["format"]
? config_["format"].asString() : "{capacity}%";
label_.set_text(fmt::format(format, fmt::arg("capacity", capacity),
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;
}
}
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std::string waybar::modules::Battery::getIcon(uint16_t percentage)
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{
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if (!config_["format-icons"] || !config_["format-icons"].isArray()) {
return "";
}
auto size = config_["format-icons"].size();
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auto idx = std::clamp(percentage / (100 / size), 0U, size - 1);
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return config_["format-icons"][idx].asString();
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}