waybar/src/modules/keyboard_state.cpp

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#include "modules/keyboard_state.hpp"
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#include <errno.h>
#include <spdlog/spdlog.h>
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#include <string.h>
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#include <filesystem>
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extern "C" {
#include <fcntl.h>
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#include <sys/stat.h>
#include <sys/types.h>
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}
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class errno_error : public std::runtime_error {
public:
int code;
errno_error(int code, const std::string& msg)
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: std::runtime_error(getErrorMsg(code, msg.c_str())), code(code) {}
errno_error(int code, const char* msg) : std::runtime_error(getErrorMsg(code, msg)), code(code) {}
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private:
static auto getErrorMsg(int err, const char* msg) -> std::string {
std::string error_msg{msg};
error_msg += ": ";
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#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 32)
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// strerrorname_np gets the error code's name; it's nice to have, but it's a recent GNU
// extension
const auto errno_name = strerrorname_np(err);
error_msg += errno_name;
error_msg += " ";
#endif
const auto errno_str = strerror(err);
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error_msg += errno_str;
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return error_msg;
}
};
auto openFile(const std::string& path, int flags) -> int {
int fd = open(path.c_str(), flags);
if (fd < 0) {
if (errno == EACCES) {
throw errno_error(errno, "Can't open " + path + " (are you in the input group?)");
} else {
throw errno_error(errno, "Can't open " + path);
}
}
return fd;
}
auto closeFile(int fd) -> void {
int res = close(fd);
if (res < 0) {
throw errno_error(errno, "Can't close file");
}
}
auto openDevice(int fd) -> libevdev* {
libevdev* dev;
int err = libevdev_new_from_fd(fd, &dev);
if (err < 0) {
throw errno_error(-err, "Can't create libevdev device");
}
return dev;
}
auto supportsLockStates(const libevdev* dev) -> bool {
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return libevdev_has_event_type(dev, EV_LED) && libevdev_has_event_code(dev, EV_LED, LED_NUML) &&
libevdev_has_event_code(dev, EV_LED, LED_CAPSL) &&
libevdev_has_event_code(dev, EV_LED, LED_SCROLLL);
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}
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waybar::modules::KeyboardState::KeyboardState(const std::string& id, const Bar& bar,
const Json::Value& config)
: AModule(config, "keyboard-state", id, false, !config["disable-scroll"].asBool()),
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box_(bar.vertical ? Gtk::ORIENTATION_VERTICAL : Gtk::ORIENTATION_HORIZONTAL, 0),
numlock_label_(""),
capslock_label_(""),
numlock_format_(config_["format"].isString() ? config_["format"].asString()
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: config_["format"]["numlock"].isString()
? config_["format"]["numlock"].asString()
: "{name} {icon}"),
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capslock_format_(config_["format"].isString() ? config_["format"].asString()
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: config_["format"]["capslock"].isString()
? config_["format"]["capslock"].asString()
: "{name} {icon}"),
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scrolllock_format_(config_["format"].isString() ? config_["format"].asString()
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: config_["format"]["scrolllock"].isString()
? config_["format"]["scrolllock"].asString()
: "{name} {icon}"),
interval_(
std::chrono::seconds(config_["interval"].isUInt() ? config_["interval"].asUInt() : 1)),
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icon_locked_(config_["format-icons"]["locked"].isString()
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? config_["format-icons"]["locked"].asString()
: "locked"),
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icon_unlocked_(config_["format-icons"]["unlocked"].isString()
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? config_["format-icons"]["unlocked"].asString()
: "unlocked"),
fd_(0),
dev_(nullptr) {
box_.set_name("keyboard-state");
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if (config_["numlock"].asBool()) {
numlock_label_.get_style_context()->add_class("numlock");
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box_.pack_end(numlock_label_, false, false, 0);
}
if (config_["capslock"].asBool()) {
capslock_label_.get_style_context()->add_class("capslock");
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box_.pack_end(capslock_label_, false, false, 0);
}
if (config_["scrolllock"].asBool()) {
scrolllock_label_.get_style_context()->add_class("scrolllock");
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box_.pack_end(scrolllock_label_, false, false, 0);
}
if (!id.empty()) {
box_.get_style_context()->add_class(id);
}
event_box_.add(box_);
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if (config_["device-path"].isString()) {
std::string dev_path = config_["device-path"].asString();
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fd_ = openFile(dev_path, O_NONBLOCK | O_CLOEXEC | O_RDONLY);
dev_ = openDevice(fd_);
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} else {
DIR* dev_dir = opendir("/dev/input");
if (dev_dir == nullptr) {
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throw errno_error(errno, "Failed to open /dev/input");
}
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dirent* ep;
while ((ep = readdir(dev_dir))) {
if (ep->d_type != DT_CHR) continue;
std::string dev_path = std::string("/dev/input/") + ep->d_name;
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int fd = openFile(dev_path.c_str(), O_NONBLOCK | O_CLOEXEC | O_RDONLY);
try {
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auto dev = openDevice(fd);
if (supportsLockStates(dev)) {
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spdlog::info("Found device {} at '{}'", libevdev_get_name(dev), dev_path);
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fd_ = fd;
dev_ = dev;
break;
}
} catch (const errno_error& e) {
// ENOTTY just means the device isn't an evdev device, skip it
if (e.code != ENOTTY) {
spdlog::warn(e.what());
}
}
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closeFile(fd);
}
if (dev_ == nullptr) {
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throw errno_error(errno, "Failed to find keyboard device");
}
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}
thread_ = [this] {
dp.emit();
thread_.sleep_for(interval_);
};
}
waybar::modules::KeyboardState::~KeyboardState() {
libevdev_free(dev_);
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try {
closeFile(fd_);
} catch (const std::runtime_error& e) {
spdlog::warn(e.what());
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}
}
auto waybar::modules::KeyboardState::update() -> void {
int err = LIBEVDEV_READ_STATUS_SUCCESS;
while (err == LIBEVDEV_READ_STATUS_SUCCESS) {
input_event ev;
err = libevdev_next_event(dev_, LIBEVDEV_READ_FLAG_NORMAL, &ev);
while (err == LIBEVDEV_READ_STATUS_SYNC) {
err = libevdev_next_event(dev_, LIBEVDEV_READ_FLAG_SYNC, &ev);
}
}
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if (-err != EAGAIN) {
throw errno_error(-err, "Failed to sync evdev device");
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}
int numl = libevdev_get_event_value(dev_, EV_LED, LED_NUML);
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int capsl = libevdev_get_event_value(dev_, EV_LED, LED_CAPSL);
int scrolll = libevdev_get_event_value(dev_, EV_LED, LED_SCROLLL);
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struct {
bool state;
Gtk::Label& label;
const std::string& format;
const char* name;
} label_states[] = {
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{(bool)numl, numlock_label_, numlock_format_, "Num"},
{(bool)capsl, capslock_label_, capslock_format_, "Caps"},
{(bool)scrolll, scrolllock_label_, scrolllock_format_, "Scroll"},
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};
for (auto& label_state : label_states) {
std::string text;
text = fmt::format(label_state.format,
fmt::arg("icon", label_state.state ? icon_locked_ : icon_unlocked_),
fmt::arg("name", label_state.name));
label_state.label.set_markup(text);
if (label_state.state) {
label_state.label.get_style_context()->add_class("locked");
} else {
label_state.label.get_style_context()->remove_class("locked");
}
}
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AModule::update();
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}