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@ -1,14 +1,18 @@
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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, Device, Key, RelativeAxisType};
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use evdev::{AttributeSet, Device, FetchEventsSynced, 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::process;
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use std::os::unix::prelude::AsRawFd;
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use std::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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@ -52,16 +56,16 @@ pub fn output_device() -> Result<VirtualDevice, Box<dyn Error>> {
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relative_axes.insert(RelativeAxisType::REL_MISC);
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let device = VirtualDeviceBuilder::new()?
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.name(¤t_device_name())
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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) -> Result<Option<Inotify>, Box<dyn Error>> {
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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::empty())?;
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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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@ -69,22 +73,17 @@ pub fn device_watcher(watch: bool) -> Result<Option<Inotify>, Box<dyn Error>> {
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}
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}
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pub fn input_devices(
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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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watch: bool,
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) -> Result<Vec<Device>, Box<dyn Error>> {
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let mut path_devices = list_devices()?;
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let mut paths: Vec<String> = path_devices.keys().cloned().collect();
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paths.sort_by(|a, b| device_index(a).partial_cmp(&device_index(b)).unwrap());
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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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for path in &paths {
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if let Some(device) = path_devices.get(path) {
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println!("{:18}: {}", path, device_name(device));
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}
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}
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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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@ -97,110 +96,154 @@ pub fn input_devices(
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} else {
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println!(", ignoring {:?}:", ignore_opts);
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}
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for path in &paths {
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if let Some(device) = path_devices.get(path) {
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let matched = if device_opts.is_empty() {
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is_keyboard(device)
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} else {
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match_device(path, device, device_opts)
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} && (ignore_opts.is_empty() || !match_device(path, device, ignore_opts));
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if !matched {
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path_devices.remove(path);
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}
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}
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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) && device.grab()).then(|| device)
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})
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.collect();
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println!("{}", SEPARATOR);
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if path_devices.is_empty() {
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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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return Err("No device was selected!".into());
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bail!("No device was selected!");
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}
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} else {
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for (path, device) in path_devices.iter() {
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println!("{:18}: {}", path, device_name(device));
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}
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devices.iter().for_each(InputDevice::print);
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}
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println!("{}", SEPARATOR);
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let mut devices: Vec<Device> = path_devices.into_values().collect();
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for device in devices.iter_mut() {
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device
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.grab()
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.map_err(|e| format!("Failed to grab device '{}': {}", device_name(device), e))?;
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}
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Ok(devices)
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Ok(devices.into_iter().map(From::from).collect())
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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 list_devices() -> Result<HashMap<String, Device>, Box<dyn Error>> {
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let mut path_devices: HashMap<String, Device> = HashMap::new();
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if let Ok(dev_input) = read_dir("/dev/input").as_mut() {
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for entry in dev_input {
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let path = entry?.path();
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if let Some(fname) = path.file_name() {
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if fname.as_bytes().starts_with(b"event") {
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// Allow "Permission denied" when opening the current process's own device.
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if let Ok(device) = Device::open(&path) {
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if let Ok(path) = path.into_os_string().into_string() {
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path_devices.insert(path, device);
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}
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}
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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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Ok(path_devices)
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}
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fn device_name(device: &Device) -> &str {
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device.name().unwrap_or("<Unnamed device>")
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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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fn device_index(path: &str) -> i32 {
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path.trim_start_matches("/dev/input/event").parse::<i32>().unwrap()
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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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fn current_device_name() -> String {
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format!("xremap pid={}", process::id())
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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 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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}
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fn match_device(path: &str, device: &Device, device_opts: &[String]) -> bool {
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// Force unmatch its own device
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if device_name(device) == current_device_name() {
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return false;
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impl InputDevice {
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pub fn is_input_device(&self, device_filter: &[String], ignore_filter: &[String]) -> bool {
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(if device_filter.is_empty() {
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self.is_keyboard()
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} else {
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self.matches(device_filter)
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}) && (ignore_filter.is_empty() || !self.matches(ignore_filter))
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}
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for device_opt in device_opts {
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// Check exact matches for explicit selection
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if path == device_opt || device_name(device) == device_opt {
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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 device_opt.starts_with("event") && path == format!("/dev/input/{}", device_opt) {
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return true;
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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() -> String {
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format!("xremap pid={}", process::id())
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}
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fn matches(&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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// Allow partial matches for device names
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if device_name(device).contains(device_opt) {
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return true;
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for device_opt in filter {
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let device_opt = device_opt.as_str();
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// Check exact matches for explicit selection
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if self.path.as_os_str() == device_opt || self.device_name() == device_opt {
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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 device_opt.starts_with("event")
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&& self.path.file_name().expect("every device path has a file name") == device_opt
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{
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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.device_name().contains(device_opt) {
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return true;
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}
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}
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false
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}
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false
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}
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fn is_keyboard(device: &Device) -> bool {
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// Credit: https://github.com/mooz/xkeysnail/blob/bf3c93b4fe6efd42893db4e6588e5ef1c4909cfb/xkeysnail/input.py#L17-L32
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match device.supported_keys() {
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Some(keys) => {
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keys.contains(Key::KEY_SPACE)
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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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None => false,
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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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static SEPARATOR: &str = "------------------------------------------------------------------------------";
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const SEPARATOR: &str = "------------------------------------------------------------------------------";
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Roland Fredenhagen
2 years ago