waybar/src/modules/battery.cpp

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#include "modules/battery.hpp"
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#include <spdlog/spdlog.h>
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waybar::modules::Battery::Battery(const std::string& id, const Json::Value& config)
: ALabel(config, "battery", id, "{capacity}%", 60) {
getBatteries();
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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_) {
auto wd = inotify_add_watch(fd_, (bat / "uevent").c_str(), IN_ACCESS);
if (wd != -1) {
wds_.push_back(wd);
}
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}
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worker();
}
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waybar::modules::Battery::~Battery() {
for (auto wd : wds_) {
inotify_rm_watch(fd_, wd);
}
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close(fd_);
}
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void waybar::modules::Battery::worker() {
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thread_timer_ = [this] {
dp.emit();
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thread_timer_.sleep_for(interval_);
};
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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));
if (nbytes != sizeof(event) || event.mask & IN_IGNORED) {
thread_.stop();
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return;
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}
// TODO: don't stop timer for now since there is some bugs :?
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// thread_timer_.stop();
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dp.emit();
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};
}
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void waybar::modules::Battery::getBatteries() {
try {
for (auto& node : fs::directory_iterator(data_dir_)) {
if (!fs::is_directory(node)) {
continue;
}
auto dir_name = node.path().filename();
auto bat_defined = config_["bat"].isString();
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if (((bat_defined && dir_name == config_["bat"].asString()) || !bat_defined) &&
fs::exists(node.path() / "capacity") && fs::exists(node.path() / "uevent") &&
fs::exists(node.path() / "status")) {
batteries_.push_back(node.path());
}
auto adap_defined = config_["adapter"].isString();
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if (((adap_defined && dir_name == config_["adapter"].asString()) || !adap_defined) &&
fs::exists(node.path() / "online")) {
adapter_ = node.path();
}
}
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} catch (fs::filesystem_error& e) {
throw std::runtime_error(e.what());
}
if (batteries_.empty()) {
if (config_["bat"].isString()) {
throw std::runtime_error("No battery named " + config_["bat"].asString());
}
throw std::runtime_error("No batteries.");
}
}
const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos() const {
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try {
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uint16_t total = 0;
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uint32_t total_power = 0; // μW
uint32_t total_energy = 0; // μWh
uint32_t total_energy_full = 0;
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std::string status = "Unknown";
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for (auto const& bat : batteries_) {
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uint16_t capacity;
uint32_t power_now;
uint32_t energy_full;
uint32_t energy_now;
std::string _status;
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std::ifstream(bat / "capacity") >> capacity;
std::ifstream(bat / "status") >> _status;
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auto rate_path = fs::exists(bat / "current_now") ? "current_now" : "power_now";
std::ifstream(bat / rate_path) >> power_now;
auto now_path = fs::exists(bat / "charge_now") ? "charge_now" : "energy_now";
std::ifstream(bat / now_path) >> energy_now;
auto full_path = fs::exists(bat / "charge_full") ? "charge_full" : "energy_full";
std::ifstream(bat / full_path) >> energy_full;
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if (_status != "Unknown") {
status = _status;
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}
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total += capacity;
total_power += power_now;
total_energy += energy_now;
total_energy_full += energy_full;
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}
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if (!adapter_.empty() && status == "Discharging") {
bool online;
std::ifstream(adapter_ / "online") >> online;
if (online) {
status = "Plugged";
}
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}
float time_remaining = 0;
if (status == "Discharging" && total_power != 0) {
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time_remaining = (float)total_energy / total_power;
} else if (status == "Charging" && total_power != 0) {
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time_remaining = -(float)(total_energy_full - total_energy) / total_power;
}
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uint16_t capacity = total / batteries_.size();
return {capacity, time_remaining, status};
} catch (const std::exception& e) {
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spdlog::error("Battery: {}", e.what());
return {0, 0, "Unknown"};
}
}
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const std::string waybar::modules::Battery::getAdapterStatus(uint8_t capacity) const {
if (!adapter_.empty()) {
bool online;
std::ifstream(adapter_ / "online") >> online;
if (capacity == 100) {
return "Full";
}
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if (online) {
return "Plugged";
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}
return "Discharging";
}
return "Unknown";
}
const std::string waybar::modules::Battery::formatTimeRemaining(float hoursRemaining) {
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hoursRemaining = std::fabs(hoursRemaining);
uint16_t full_hours = static_cast<uint16_t>(hoursRemaining);
uint16_t minutes = static_cast<uint16_t>(60 * (hoursRemaining - full_hours));
auto format = std::string("{H} h {M} min");
if (config_["format-time"].isString()) {
format = config_["format-time"].asString();
}
return fmt::format(format, fmt::arg("H", full_hours), fmt::arg("M", minutes));
}
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auto waybar::modules::Battery::update() -> void {
auto [capacity, time_remaining, status] = getInfos();
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if (status == "Unknown") {
status = getAdapterStatus(capacity);
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}
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if (tooltipEnabled()) {
std::string tooltip_text;
if (time_remaining != 0) {
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std::string time_to = std::string("Time to ") + ((time_remaining > 0) ? "empty" : "full");
tooltip_text = time_to + ": " + formatTimeRemaining(time_remaining);
} else {
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tooltip_text = status;
}
label_.set_tooltip_text(tooltip_text);
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}
// Transform to lowercase
std::transform(status.begin(), status.end(), status.begin(), ::tolower);
// Replace space with underscore
std::transform(status.begin(), status.end(), status.begin(), [](char ch) {
return ch == ' ' ? '_' : ch;
});
auto format = format_;
auto state = getState(capacity, true);
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if (!old_status_.empty()) {
label_.get_style_context()->remove_class(old_status_);
}
label_.get_style_context()->add_class(status);
old_status_ = status;
if (!state.empty() && config_["format-" + status + "-" + state].isString()) {
format = config_["format-" + status + "-" + state].asString();
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} else if (config_["format-" + status].isString()) {
format = config_["format-" + status].asString();
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} else if (!state.empty() && config_["format-" + state].isString()) {
format = config_["format-" + state].asString();
}
if (format.empty()) {
event_box_.hide();
} else {
event_box_.show();
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label_.set_markup(fmt::format(format,
fmt::arg("capacity", capacity),
fmt::arg("icon", getIcon(capacity, state)),
fmt::arg("time", formatTimeRemaining(time_remaining))));
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}
}