mirror of https://github.com/k0kubun/xremap
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315 lines
9.5 KiB
Rust
315 lines
9.5 KiB
Rust
extern crate evdev;
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extern crate nix;
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use anyhow::bail;
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use derive_where::derive_where;
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use evdev::uinput::{VirtualDevice, VirtualDeviceBuilder};
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use evdev::{AttributeSet, BusType, Device, FetchEventsSynced, InputId, Key, RelativeAxisType};
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use nix::sys::inotify::{AddWatchFlags, InitFlags, Inotify};
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use std::collections::HashMap;
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use std::error::Error;
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use std::fs::read_dir;
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use std::os::unix::ffi::OsStrExt;
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use std::os::unix::prelude::AsRawFd;
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use std::path::{Path, PathBuf};
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use std::{io, process};
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static MOUSE_BTNS: [&str; 20] = [
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"BTN_MISC",
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"BTN_0",
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"BTN_1",
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"BTN_2",
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"BTN_3",
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"BTN_4",
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"BTN_5",
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"BTN_6",
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"BTN_7",
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"BTN_8",
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"BTN_9",
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"BTN_MOUSE",
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"BTN_LEFT",
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"BTN_RIGHT",
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"BTN_MIDDLE",
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"BTN_SIDE",
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"BTN_EXTRA",
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"BTN_FORWARD",
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"BTN_BACK",
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"BTN_TASK",
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];
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static mut DEVICE_NAME: Option<String> = None;
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// Credit: https://github.com/mooz/xkeysnail/blob/bf3c93b4fe6efd42893db4e6588e5ef1c4909cfb/xkeysnail/output.py#L10-L32
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pub fn output_device(bus_type: Option<BusType>, enable_wheel: bool) -> Result<VirtualDevice, Box<dyn Error>> {
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let mut keys: AttributeSet<Key> = AttributeSet::new();
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for code in Key::KEY_RESERVED.code()..Key::BTN_TRIGGER_HAPPY40.code() {
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let key = Key::new(code);
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let name = format!("{:?}", key);
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if name.starts_with("KEY_") || MOUSE_BTNS.contains(&&*name) {
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keys.insert(key);
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}
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}
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let mut relative_axes: AttributeSet<RelativeAxisType> = AttributeSet::new();
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relative_axes.insert(RelativeAxisType::REL_X);
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relative_axes.insert(RelativeAxisType::REL_Y);
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if enable_wheel {
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relative_axes.insert(RelativeAxisType::REL_HWHEEL);
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relative_axes.insert(RelativeAxisType::REL_WHEEL);
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}
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relative_axes.insert(RelativeAxisType::REL_MISC);
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let device = VirtualDeviceBuilder::new()?
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// These are taken from https://docs.rs/evdev/0.12.0/src/evdev/uinput.rs.html#183-188
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.input_id(InputId::new(bus_type.unwrap_or(BusType::BUS_USB), 0x1234, 0x5678, 0x111))
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.name(&InputDevice::current_name())
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.with_keys(&keys)?
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.with_relative_axes(&relative_axes)?
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.build()?;
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Ok(device)
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}
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pub fn device_watcher(watch: bool) -> anyhow::Result<Option<Inotify>> {
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if watch {
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let inotify = Inotify::init(InitFlags::IN_NONBLOCK)?;
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inotify.add_watch("/dev/input", AddWatchFlags::IN_CREATE | AddWatchFlags::IN_ATTRIB)?;
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Ok(Some(inotify))
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} else {
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Ok(None)
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}
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}
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pub fn get_input_devices(
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device_opts: &[String],
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ignore_opts: &[String],
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mouse: bool,
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watch: bool,
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) -> anyhow::Result<HashMap<PathBuf, InputDevice>> {
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let mut devices: Vec<_> = InputDevice::devices()?.collect();
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devices.sort();
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println!("Selecting devices from the following list:");
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println!("{}", SEPARATOR);
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devices.iter().for_each(InputDevice::print);
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println!("{}", SEPARATOR);
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if device_opts.is_empty() {
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if mouse {
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print!("Selected keyboards and mice automatically since --device options weren't specified");
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} else {
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print!("Selected keyboards automatically since --device options weren't specified");
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}
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} else {
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print!("Selected devices matching {:?}", device_opts);
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};
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if ignore_opts.is_empty() {
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println!(":")
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} else {
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println!(", ignoring {:?}:", ignore_opts);
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}
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let devices: Vec<_> = devices
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.into_iter()
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// filter map needed for mutable access
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// alternative is `Vec::retain_mut` whenever that gets stabilized
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.filter_map(|mut device| {
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// filter out any not matching devices and devices that error on grab
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(device.is_input_device(device_opts, ignore_opts, mouse) && device.grab()).then(|| device)
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})
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.collect();
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println!("{}", SEPARATOR);
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if devices.is_empty() {
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if watch {
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println!("warning: No device was selected, but --watch is waiting for new devices.");
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} else {
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bail!("No device was selected!");
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}
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} else {
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devices.iter().for_each(InputDevice::print);
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}
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println!("{}", SEPARATOR);
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Ok(devices.into_iter().map(From::from).collect())
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}
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#[derive(Debug)]
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pub struct InputDeviceInfo<'a> {
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pub name: &'a str,
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pub path: &'a Path,
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}
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impl<'a> InputDeviceInfo<'a> {
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pub fn matches(&self, filter: &String) -> bool {
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let filter = filter.as_str();
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// Check exact matches for explicit selection
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if self.path.as_os_str() == filter || self.name == filter {
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return true;
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}
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// eventXX shorthand for /dev/input/eventXX
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if filter.starts_with("event") && self.path.file_name().expect("every device path has a file name") == filter {
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return true;
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}
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// Allow partial matches for device names
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if self.name.contains(filter) {
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return true;
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}
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return false;
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}
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}
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#[derive_where(PartialEq, PartialOrd, Ord)]
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pub struct InputDevice {
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path: PathBuf,
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#[derive_where(skip)]
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device: Device,
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}
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impl Eq for InputDevice {}
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impl TryFrom<PathBuf> for InputDevice {
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type Error = io::Error;
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fn try_from(path: PathBuf) -> Result<Self, Self::Error> {
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let fname = path
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.file_name()
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.ok_or_else(|| io::Error::from(io::ErrorKind::InvalidInput))?;
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if fname.as_bytes().starts_with(b"event") {
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Ok(Self {
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device: Device::open(&path)?,
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path,
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})
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} else {
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Err(io::ErrorKind::InvalidInput.into())
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}
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}
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}
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impl From<InputDevice> for (PathBuf, InputDevice) {
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fn from(device: InputDevice) -> Self {
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(device.path.clone(), device)
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}
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}
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impl AsRawFd for InputDevice {
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fn as_raw_fd(&self) -> std::os::unix::prelude::RawFd {
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self.device.as_raw_fd()
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}
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}
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/// Device Wrappers Abstractions
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impl InputDevice {
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pub fn grab(&mut self) -> bool {
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if let Err(error) = self.device.grab() {
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println!("Failed to grab device '{}' at '{}' due to: {error}", self.device_name(), self.path.display());
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false
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} else {
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true
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}
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}
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pub fn ungrab(&mut self) {
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if let Err(error) = self.device.ungrab() {
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println!("Failed to ungrab device '{}' at '{}' due to: {error}", self.device_name(), self.path.display());
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}
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}
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pub fn fetch_events(&mut self) -> io::Result<FetchEventsSynced> {
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self.device.fetch_events()
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}
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fn device_name(&self) -> &str {
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self.device.name().unwrap_or("<Unnamed device>")
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}
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pub fn bus_type(&self) -> BusType {
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self.device.input_id().bus_type()
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}
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pub fn to_info(&self) -> InputDeviceInfo {
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InputDeviceInfo {
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name: self.device_name(),
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path: &self.path,
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}
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}
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}
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impl InputDevice {
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pub fn is_input_device(&self, device_filter: &[String], ignore_filter: &[String], mouse: bool) -> bool {
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if self.device_name() == Self::current_name() {
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return false;
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}
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(if device_filter.is_empty() {
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self.is_keyboard() || (mouse && self.is_mouse())
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} else {
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self.matches_any(device_filter)
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}) && (ignore_filter.is_empty() || !self.matches_any(ignore_filter))
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}
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// We can't know the device path from evdev::enumerate(). So we re-implement it.
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fn devices() -> io::Result<impl Iterator<Item = InputDevice>> {
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Ok(read_dir("/dev/input")?.filter_map(|entry| {
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// Allow "Permission denied" when opening the current process's own device.
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InputDevice::try_from(entry.ok()?.path()).ok()
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}))
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}
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fn current_name() -> &'static str {
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if unsafe { DEVICE_NAME.is_none() } {
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let device_name = if Self::has_device_name("xremap") {
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format!("xremap pid={}", process::id())
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} else {
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"xremap".to_string()
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};
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unsafe {
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DEVICE_NAME = Some(device_name);
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}
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}
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unsafe { DEVICE_NAME.as_ref() }.unwrap()
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}
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fn has_device_name(device_name: &str) -> bool {
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let devices: Vec<_> = match Self::devices() {
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Ok(devices) => devices.collect(),
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Err(_) => return true, // fallback to the safe side
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};
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devices
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.iter()
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.any(|device| return device.device_name().contains(device_name))
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}
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fn matches_any(&self, filter: &[String]) -> bool {
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// Force unmatch its own device
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if self.device_name() == Self::current_name() {
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return false;
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}
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return filter.iter().any(|f| self.to_info().matches(f));
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}
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fn is_keyboard(&self) -> bool {
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// Credit: https://github.com/mooz/xkeysnail/blob/bf3c93b4fe6efd42893db4e6588e5ef1c4909cfb/xkeysnail/input.py#L17-L32
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match self.device.supported_keys() {
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Some(keys) => {
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keys.contains(Key::KEY_SPACE)
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&& keys.contains(Key::KEY_A)
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&& keys.contains(Key::KEY_Z)
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// BTN_MOUSE
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&& !keys.contains(Key::BTN_LEFT)
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}
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None => false,
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}
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}
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fn is_mouse(&self) -> bool {
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self.device
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.supported_keys()
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.map_or(false, |keys| keys.contains(Key::BTN_LEFT))
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}
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pub fn print(&self) {
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println!("{:18}: {}", self.path.display(), self.device_name())
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}
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}
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const SEPARATOR: &str = "------------------------------------------------------------------------------";
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