extern crate evdev;
extern crate nix;
use anyhow::bail;
use derive_where::derive_where;
use evdev::uinput::{VirtualDevice, VirtualDeviceBuilder};
use evdev::{AttributeSet, Device, FetchEventsSynced, Key, RelativeAxisType};
use nix::sys::inotify::{AddWatchFlags, InitFlags, Inotify};
use std::collections::HashMap;
use std::error::Error;
use std::fs::read_dir;
use std::os::unix::ffi::OsStrExt;
use std::os::unix::prelude::AsRawFd;
use std::path::PathBuf;
use std::{io, process};
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 fn output_device() -> 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<RelativeAxisType> = AttributeSet::new();
relative_axes.insert(RelativeAxisType::REL_X);
relative_axes.insert(RelativeAxisType::REL_Y);
relative_axes.insert(RelativeAxisType::REL_HWHEEL);
relative_axes.insert(RelativeAxisType::REL_WHEEL);
relative_axes.insert(RelativeAxisType::REL_MISC);
let device = VirtualDeviceBuilder::new()?
.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(|| 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_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 grab(&mut self) -> bool {
if let Err(error) = self.device.grab() {
println!("Failed to grab device '{}' at '{}' due to: {error}", self.device_name(), self.path.display());
false
} else {
true
}
}
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>")
}
}
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(device_filter)
}) && (ignore_filter.is_empty() || !self.matches(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()
}))
}
fn current_name() -> String {
format!("xremap pid={}", process::id())
}
fn matches(&self, filter: &[String]) -> bool {
if self.device_name() == Self::current_name() {
return false;
}
for device_opt in filter {
let device_opt = device_opt.as_str();
if self.path.as_os_str() == device_opt || self.device_name() == device_opt {
return true;
}
if device_opt.starts_with("event")
&& self.path.file_name().expect("every device path has a file name") == device_opt
{
return true;
}
if self.device_name().contains(device_opt) {
return true;
}
}
false
}
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)
&& !keys.contains(Key::BTN_LEFT)
}
None => false,
}
}
fn is_mouse(&self) -> bool {
self.device
.supported_keys()
.map_or(false, |keys| keys.contains(Key::BTN_LEFT))
}
pub fn print(&self) {
println!("{:18}: {}", self.path.display(), self.device_name())
}
}
const SEPARATOR: &str = "------------------------------------------------------------------------------";