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) {
battery_watch_fd_ = inotify_init1(IN_CLOEXEC);
if (battery_watch_fd_ == -1) {
throw std::runtime_error("Unable to listen batteries.");
}
global_watch_fd_ = inotify_init1(IN_CLOEXEC);
if (global_watch_fd_ == -1) {
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throw std::runtime_error("Unable to listen batteries.");
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}
// Watch the directory for any added or removed batteries
global_watch = inotify_add_watch(global_watch_fd_, data_dir_.c_str(), IN_CREATE | IN_DELETE);
if (global_watch < 0) {
throw std::runtime_error("Could not watch for battery plug/unplug");
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}
refreshBatteries();
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worker();
}
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waybar::modules::Battery::~Battery() {
std::lock_guard<std::mutex> guard(battery_list_mutex_);
if (global_watch >= 0) {
inotify_rm_watch(global_watch_fd_, global_watch);
}
close(global_watch_fd_);
for (auto it = batteries_.cbegin(); it != batteries_.cend(); it++) {
auto watch_id = (*it).second;
if (watch_id >= 0) {
inotify_rm_watch(battery_watch_fd_, watch_id);
}
batteries_.erase(it);
}
close(battery_watch_fd_);
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}
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void waybar::modules::Battery::worker() {
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thread_timer_ = [this] {
// Make sure we eventually update the list of batteries even if we miss an
// inotify event for some reason
refreshBatteries();
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};
int nbytes = read(battery_watch_fd_, &event, sizeof(event));
if (nbytes != sizeof(event) || event.mask & IN_IGNORED) {
thread_.stop();
return;
}
dp.emit();
};
thread_battery_update_ = [this] {
struct inotify_event event = {0};
int nbytes = read(global_watch_fd_, &event, sizeof(event));
if (nbytes != sizeof(event) || event.mask & IN_IGNORED) {
thread_.stop();
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return;
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}
refreshBatteries();
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dp.emit();
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};
}
void waybar::modules::Battery::refreshBatteries() {
std::lock_guard<std::mutex> guard(battery_list_mutex_);
// Mark existing list of batteries as not necessarily found
std::map<fs::path, bool> check_map;
for (auto const& bat : batteries_) {
check_map[bat.first] = false;
}
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") && fs::exists(node.path() / "type")) {
std::string type;
std::ifstream(node.path() / "type") >> type;
if (!type.compare("Battery")){
check_map[node.path()] = true;
auto search = batteries_.find(node.path());
if (search == batteries_.end()) {
// We've found a new battery save it and start listening for events
auto event_path = (node.path() / "uevent");
auto wd = inotify_add_watch(battery_watch_fd_, event_path.c_str(), IN_ACCESS);
if (wd < 0) {
throw std::runtime_error("Could not watch events for " + node.path().string());
}
batteries_[node.path()] = wd;
}
}
}
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.");
}
// Remove any batteries that are no longer present and unwatch them
for (auto const& check : check_map) {
if (!check.second) {
auto watch_id = batteries_[check.first];
if (watch_id >= 0) {
inotify_rm_watch(battery_watch_fd_, watch_id);
}
batteries_.erase(check.first);
}
}
}
const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos() {
std::lock_guard<std::mutex> guard(battery_list_mutex_);
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try {
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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";
for (auto const& item : batteries_) {
auto bat = item.first;
uint32_t power_now;
uint32_t energy_full;
uint32_t energy_now;
std::string _status;
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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}
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;
if (time_remaining > 0.0f) {
// If we've turned positive it means the battery is past 100% and so
// just report that as no time remaining
time_remaining = 0.0f;
}
}
float capacity = ((float)total_energy * 100.0f / (float) total_energy_full);
// Handle full-at
if (config_["full-at"].isUInt()) {
auto full_at = config_["full-at"].asUInt();
if (full_at < 100) {
capacity = 100.f * capacity / full_at;
}
}
if (capacity > 100.f) {
// This can happen when the battery is calibrating and goes above 100%
// Handle it gracefully by clamping at 100%
capacity = 100.f;
}
uint8_t cap = round(capacity);
if (cap == 100) {
// If we've reached 100% just mark as full as some batteries can stay
// stuck reporting they're still charging but not yet done
status = "Full";
}
return {cap, 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) {
hoursRemaining = std::fabs(hoursRemaining);
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uint16_t full_hours = static_cast<uint16_t>(hoursRemaining);
uint16_t minutes = static_cast<uint16_t>(60 * (hoursRemaining - full_hours));
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auto format = std::string("{H} h {M} min");
if (full_hours == 0 && minutes == 0) {
// Migh as well not show "0h 0min"
return "";
}
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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}
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// Transform to lowercase and replace space with dash
std::transform(status.begin(), status.end(), status.begin(), [](char ch) {
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return ch == ' ' ? '-' : std::tolower(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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auto icons = std::vector<std::string>{status + "-" + state, status, state};
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label_.set_markup(fmt::format(format,
fmt::arg("capacity", capacity),
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fmt::arg("icon", getIcon(capacity, icons)),
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fmt::arg("time", formatTimeRemaining(time_remaining))));
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}
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// Call parent update
ALabel::update();
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}