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use std::collections::HashMap;
use std::ffi::CString;
use std::os::raw::{c_int, c_uchar, c_void};
use std::process::Command;
use std::ptr::null;
use std::{thread, time};
use x11::xlib::*;
use x11::xtest::*;
use crate::module::unicode::UnicodeOutput;
const KEY_DELAY_US: u64 = 60000;
pub struct XConnection {
display: *mut x11::xlib::_XDisplay,
charmap: HashMap<char, u32>,
held: Vec<char>,
}
impl Default for XConnection {
fn default() -> Self {
Self::new()
}
}
impl XConnection {
pub fn new() -> XConnection {
unsafe {
let display = XOpenDisplay(null());
let charmap = HashMap::new();
let held = Vec::new();
XConnection {
display,
charmap,
held,
}
}
}
#[link(name = "X11")]
pub fn find_keycode(&self, keysym: u64) -> (bool, Option<u32>) {
let display = self.display;
let mut keycode = None;
let mut empty = false;
unsafe {
let mut keycode_low: c_int = 0;
let mut keycode_high: c_int = 0;
XDisplayKeycodes(display, &mut keycode_low, &mut keycode_high);
let mut keysyms_per_keycode: c_int = 0;
let keysyms = XGetKeyboardMapping(
display,
keycode_low as c_uchar,
keycode_high - keycode_low,
&mut keysyms_per_keycode,
);
for i in keycode_low..keycode_high {
empty = true;
for j in 0..keysyms_per_keycode {
let symindex = (i - keycode_low) * keysyms_per_keycode + j;
let s = *keysyms.offset(symindex as isize);
let c = XKeysymToString(s);
if c.as_ref().is_some() {
let v = std::ffi::CStr::from_ptr(c);
trace!("sym[{},{}] = {} ({:?})", i, j, s, v.to_str().unwrap_or(""));
} else {
trace!("sym[{},{}] = {}", i, j, s);
}
if s == keysym {
empty = false;
keycode = Some(i as u32);
break;
}
if s != 0 {
empty = false;
break;
}
}
if empty {
keycode = Some(i as u32);
break;
}
}
XFree(keysyms as *mut c_void);
}
(empty, keycode)
}
pub fn lookup_sym(symbol: char) -> u64 {
let hex: u32 = symbol.into();
let s = format!("U{:x}", hex);
let xs = CString::new(s).unwrap();
unsafe { XStringToKeysym(xs.as_ptr()) }
}
pub fn bind_key(&self, keycode: u32, keysym: u64) {
unsafe {
let mut keysyms = [keysym, keysym];
XChangeKeyboardMapping(
self.display,
keycode as i32,
keysyms.len() as i32,
keysyms.as_mut_ptr(),
1,
);
XSync(self.display, false as i32);
}
}
pub fn unbind_key(&self, keycode: u32) {
unsafe {
let mut no_sym: u64 = 0;
XChangeKeyboardMapping(self.display, keycode as i32, 1, &mut no_sym, 1);
}
}
pub fn press_key(&self, keycode: u32, state: bool, time: x11::xlib::Time) {
unsafe {
XTestFakeKeyEvent(self.display, keycode, state as i32, time);
}
}
pub fn map_sym(&mut self, c: char) -> Option<u32> {
let keysym = XConnection::lookup_sym(c);
let (unmapped, keycode) = self.find_keycode(keysym);
if let Some(keycode) = keycode {
if unmapped {
self.bind_key(keycode, keysym);
self.charmap.insert(c, keycode);
}
Some(keycode)
} else {
warn!("Could not find available keycode");
None
}
}
pub fn unmap_sym(&mut self, c: char) {
if let Some(keycode) = self.charmap.get(&c) {
self.unbind_key(*keycode);
self.charmap.remove(&c);
}
}
pub fn get_sym(&mut self, c: char) -> Option<u32> {
if let Some(keycode) = self.charmap.get(&c) {
Some(*keycode)
} else {
self.map_sym(c)
}
}
}
impl Drop for XConnection {
fn drop(&mut self) {
info!("Releasing all keys");
for c in &self.held.clone() {
self.press_symbol(*c, false);
}
info!("Unbinding all keys");
for keycode in self.charmap.values() {
self.unbind_key(*keycode);
}
unsafe {
XCloseDisplay(self.display);
}
}
}
impl UnicodeOutput for XConnection {
fn get_layout(&self) -> String {
let result = Command::new("setxkbmap")
.args(&["-query"])
.output()
.expect("Failed to exec setxkbmap");
let output = String::from_utf8_lossy(&result.stdout);
let mut map = output
.lines()
.map(|l| l.split(':'))
.map(|mut kv| (kv.next().unwrap_or(""), kv.next().unwrap_or("")));
let layout = map
.find(|(k, _): &(&str, &str)| *k == "layout")
.map(|(_, v)| v.trim())
.unwrap_or("");
layout.to_string()
}
fn set_layout(&self, layout: &str) {
Command::new("setxkbmap").args(&[layout]).output().unwrap();
}
fn type_string(&mut self, string: &str) {
let mut keycodes = Vec::with_capacity(string.len());
for c in string.chars() {
if c == '\0' {
continue;
}
if let Some(keycode) = self.get_sym(c) {
info!("Type {} => {:x?}", keycode, c);
keycodes.push(keycode);
}
}
let time = x11::xlib::CurrentTime;
for k in keycodes.iter() {
self.press_key(*k, true, time);
thread::sleep(time::Duration::from_micros(KEY_DELAY_US));
self.press_key(*k, false, time);
}
unsafe {
XFlush(self.display);
}
for c in string.chars() {
self.unmap_sym(c);
}
}
fn press_symbol(&mut self, c: char, press: bool) {
if c == '\0' {
return;
}
if let Some(keycode) = self.get_sym(c) {
println!("Set {:?} ({}) = {}", c, keycode, press);
self.press_key(keycode, press, x11::xlib::CurrentTime);
if press {
self.held.push(c);
} else {
self.unmap_sym(c);
self.held
.iter()
.position(|&x| x == c)
.map(|e| self.held.remove(e));
}
unsafe {
XFlush(self.display);
}
}
}
fn get_held(&mut self) -> Vec<char> {
self.held.clone()
}
fn set_held(&mut self, string: &str) {
let s: Vec<char> = string.chars().collect();
for c in &self.held.clone() {
if !s.contains(c) {
self.press_symbol(*c, false);
}
}
for c in &s {
self.press_symbol(*c, true);
}
}
}