extern crate evdev;
extern crate nix;
use anyhow::bail;
use derive_where::derive_where;
use evdev::uinput::VirtualDevice;
use evdev::{AttributeSet, BusType, Device, FetchEventsSynced, InputId, KeyCode as Key, RelativeAxisCode};
use log::debug;
use nix::sys::inotify::{AddWatchFlags, InitFlags, Inotify};
use std::collections::HashMap;
use std::error::Error;
#[cfg(feature = "udev")]
use std::fs::metadata;
use std::fs::read_dir;
#[cfg(feature = "udev")]
use std::os::linux::fs::MetadataExt;
use std::os::unix::ffi::OsStrExt;
use std::os::unix::prelude::AsRawFd;
use std::path::{Path, PathBuf};
use std::time::Duration;
use std::{io, process};
#[cfg(feature = "udev")]
use udev::DeviceType;
static MOUSE_BTNS: [&str; 20] = [
"BTN_MISC",
"BTN_0",
"BTN_1",
"BTN_2",
"BTN_3",
"BTN_4",
"BTN_5",
"BTN_6",
"BTN_7",
"BTN_8",
"BTN_9",
"BTN_MOUSE",
"BTN_LEFT",
"BTN_RIGHT",
"BTN_MIDDLE",
"BTN_SIDE",
"BTN_EXTRA",
"BTN_FORWARD",
"BTN_BACK",
"BTN_TASK",
];
pub static mut DEVICE_NAME: Option<String> = None;
pub fn output_device(
bus_type: Option<BusType>,
enable_wheel: bool,
vendor: u16,
product: u16,
) -> Result<VirtualDevice, Box<dyn Error>> {
let mut keys: AttributeSet<Key> = AttributeSet::new();
for code in Key::KEY_RESERVED.code()..Key::BTN_TRIGGER_HAPPY40.code() {
let key = Key::new(code);
let name = format!("{key:?}");
if name.starts_with("KEY_") || MOUSE_BTNS.contains(&&*name) {
keys.insert(key);
}
}
let mut relative_axes: AttributeSet<RelativeAxisCode> = AttributeSet::new();
relative_axes.insert(RelativeAxisCode::REL_X);
relative_axes.insert(RelativeAxisCode::REL_Y);
if enable_wheel {
relative_axes.insert(RelativeAxisCode::REL_HWHEEL);
relative_axes.insert(RelativeAxisCode::REL_WHEEL);
}
relative_axes.insert(RelativeAxisCode::REL_MISC);
let device = VirtualDevice::builder()?
.input_id(InputId::new(bus_type.unwrap_or(BusType::BUS_USB), vendor, product, 0x111))
.name(&InputDevice::current_name())
.with_keys(&keys)?
.with_relative_axes(&relative_axes)?
.build()?;
Ok(device)
}
pub fn device_watcher(watch: bool) -> anyhow::Result<Option<Inotify>> {
if watch {
let inotify = Inotify::init(InitFlags::IN_NONBLOCK)?;
inotify.add_watch("/dev/input", AddWatchFlags::IN_CREATE | AddWatchFlags::IN_ATTRIB)?;
Ok(Some(inotify))
} else {
Ok(None)
}
}
pub fn get_input_devices(
device_opts: &[String],
ignore_opts: &[String],
mouse: bool,
watch: bool,
) -> anyhow::Result<HashMap<PathBuf, InputDevice>> {
let mut devices: Vec<_> = InputDevice::devices()?.collect();
devices.sort();
println!("Selecting devices from the following list:");
println!("{SEPARATOR}");
devices.iter().for_each(InputDevice::print);
println!("{SEPARATOR}");
if device_opts.is_empty() {
if mouse {
print!("Selected keyboards and mice automatically since --device options weren't specified");
} else {
print!("Selected keyboards automatically since --device options weren't specified");
}
} else {
print!("Selected devices matching {device_opts:?}");
};
if ignore_opts.is_empty() {
println!(":")
} else {
println!(", ignoring {ignore_opts:?}:");
}
let devices: Vec<_> = devices
.into_iter()
.filter_map(|mut device| {
(device.is_input_device(device_opts, ignore_opts, mouse) && device.grab()).then_some(device)
})
.collect();
println!("{SEPARATOR}");
if devices.is_empty() {
if watch {
println!("warning: No device was selected, but --watch is waiting for new devices.");
} else {
bail!("No device was selected!");
}
} else {
devices.iter().for_each(InputDevice::print);
}
println!("{SEPARATOR}");
Ok(devices.into_iter().map(From::from).collect())
}
#[derive(Debug)]
pub struct InputDeviceInfo<'a> {
pub name: &'a str,
pub path: &'a Path,
pub product: u16,
pub vendor: u16,
}
impl<'a> InputDeviceInfo<'a> {
pub fn matches(&self, filter: &str) -> bool {
if self.path.as_os_str() == filter || self.name == filter {
return true;
}
if filter.starts_with("event") && self.path.file_name().expect("every device path has a file name") == filter {
return true;
}
if filter.starts_with("ids:") {
let args = filter.split(':').collect::<Vec<&str>>();
if args.len() == 3 {
let vid = u16::from_str_radix(args[1].trim_start_matches("0x"), 16).unwrap_or(0);
let pid = u16::from_str_radix(args[2].trim_start_matches("0x"), 16).unwrap_or(0);
match (vid, pid) {
(0, 0) => {}
(v, 0) if v == self.vendor => {
return true;
}
(0, p) if p == self.product => {
return true;
}
(v, p) if v == self.vendor && p == self.product => {
return true;
}
(_, _) => {}
}
}
}
if self.name.contains(filter) {
return true;
}
#[cfg(feature = "udev")]
{
if filter.starts_with("props:") {
if let Ok(meta) = metadata(self.path) {
let args = filter.split(':').collect::<Vec<&str>>();
if args.len() == 3 {
if let Ok(ud) = udev::Device::from_devnum(DeviceType::Character, meta.st_rdev()) {
for _ in 0..10 {
if ud.is_initialized() {
break;
}
std::thread::sleep(std::time::Duration::from_millis(10));
}
let props = ud.properties();
for p in props.filter(|p| p.name() == args[1]) {
if p.value() == args[2] {
return true;
}
}
}
}
}
}
}
false
}
}
#[derive_where(PartialEq, PartialOrd, Ord)]
pub struct InputDevice {
path: PathBuf,
#[derive_where(skip)]
device: Device,
}
impl Eq for InputDevice {}
impl TryFrom<PathBuf> for InputDevice {
type Error = io::Error;
fn try_from(path: PathBuf) -> Result<Self, Self::Error> {
let fname = path
.file_name()
.ok_or_else(|| io::Error::from(io::ErrorKind::InvalidInput))?;
if fname.as_bytes().starts_with(b"event") {
Ok(Self {
device: Device::open(&path)?,
path,
})
} else {
Err(io::ErrorKind::InvalidInput.into())
}
}
}
impl From<InputDevice> for (PathBuf, InputDevice) {
fn from(device: InputDevice) -> Self {
(device.path.clone(), device)
}
}
impl AsRawFd for InputDevice {
fn as_raw_fd(&self) -> std::os::unix::prelude::RawFd {
self.device.as_raw_fd()
}
}
impl InputDevice {
pub fn wait_for_all_keys_up(&self) -> io::Result<()> {
for _ in 0..50 {
let keys = self.device.get_key_state()?;
if keys.iter().count() == 0 {
return Ok(());
}
std::thread::sleep(Duration::from_millis(100));
}
Err(io::Error::new(io::ErrorKind::TimedOut, "Timed out waiting for keys to be released."))
}
pub fn grab(&mut self) -> bool {
let result = self.wait_for_all_keys_up().and_then(|_| self.device.grab());
match result {
Ok(_) => true,
Err(error) => {
eprintln!(
"warning: Failed to grab device '{}' at '{}'. It may have been disconnected, have keys held down, or you may need to grant permissions. Error: {}",
self.device_name(),
self.path.display(),
error
);
false
}
}
}
pub fn ungrab(&mut self) {
if let Err(error) = self.device.ungrab() {
println!("Failed to ungrab device '{}' at '{}' due to: {error}", self.device_name(), self.path.display());
}
}
pub fn fetch_events(&mut self) -> io::Result<FetchEventsSynced<'_>> {
self.device.fetch_events()
}
fn device_name(&self) -> &str {
self.device.name().unwrap_or("<Unnamed device>")
}
pub fn bus_type(&self) -> BusType {
self.device.input_id().bus_type()
}
pub fn product(&self) -> u16 {
self.device.input_id().product()
}
pub fn vendor(&self) -> u16 {
self.device.input_id().vendor()
}
pub fn to_info(&self) -> InputDeviceInfo<'_> {
InputDeviceInfo {
name: self.device_name(),
product: self.product(),
vendor: self.vendor(),
path: &self.path,
}
}
}
impl InputDevice {
pub fn is_input_device(&self, device_filter: &[String], ignore_filter: &[String], mouse: bool) -> bool {
if self.device_name() == Self::current_name() {
return false;
}
(if device_filter.is_empty() {
self.is_keyboard() || (mouse && self.is_mouse())
} else {
self.matches_any(device_filter)
}) && (ignore_filter.is_empty() || !self.matches_any(ignore_filter))
}
fn devices() -> io::Result<impl Iterator<Item = InputDevice>> {
Ok(read_dir("/dev/input")?.filter_map(|entry| {
InputDevice::try_from(entry.ok()?.path()).ok()
}))
}
#[allow(static_mut_refs)]
fn current_name() -> &'static str {
if unsafe { DEVICE_NAME.is_none() } {
let device_name = if Self::has_device_name("xremap") {
format!("xremap pid={}", process::id())
} else {
"xremap".to_string()
};
unsafe {
DEVICE_NAME = Some(device_name);
}
}
unsafe { DEVICE_NAME.as_ref() }.unwrap()
}
fn has_device_name(device_name: &str) -> bool {
let devices: Vec<_> = match Self::devices() {
Ok(devices) => devices.collect(),
Err(_) => return true, };
devices.iter().any(|device| device.device_name().contains(device_name))
}
fn matches_any(&self, filter: &[String]) -> bool {
if self.device_name() == Self::current_name() {
return false;
}
filter.iter().any(|f| self.to_info().matches(f))
}
fn is_keyboard(&self) -> bool {
match self.device.supported_keys() {
Some(keys) => keys.contains(Key::KEY_SPACE) && keys.contains(Key::KEY_A) && keys.contains(Key::KEY_Z),
None => false,
}
}
fn is_mouse(&self) -> bool {
if self.device.supported_absolute_axes().is_some() {
debug!("Ignoring absolute device {:18} {}", self.path.display(), self.device_name());
return false;
}
self.device
.supported_keys()
.is_some_and(|keys| keys.contains(Key::BTN_LEFT))
}
pub fn print(&self) {
println!("{:18}: {}", self.path.display(), self.device_name())
}
}
pub const SEPARATOR: &str = "------------------------------------------------------------------------------";