ktrl 0.1.8

A Supercharged Keyboard Programming Daemon
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// uinput-rs
use uinput_sys;
use uinput_sys::uinput_user_dev;

use crate::keys::KeyCode;
use crate::keys::KeyValue;
use evdev_rs::enums::EventCode;
use evdev_rs::enums::EV_SYN;
use evdev_rs::InputEvent;
use evdev_rs::TimeVal;
use libc::input_event as raw_event;

// file i/o
use io::Write;
use std::fs::File;
use std::fs::OpenOptions;
use std::io;
use std::os::unix::io::AsRawFd;

// unsafe
use std::mem;
use std::slice;

// ktrl
use crate::keys::KeyEvent;

pub struct KbdOut {
    device: File,
}

impl KbdOut {
    pub fn new() -> Result<Self, io::Error> {
        let mut uinput_out_file = OpenOptions::new()
            .read(true)
            .write(true)
            .open("/dev/uinput")?;

        unsafe {
            uinput_sys::ui_set_evbit(uinput_out_file.as_raw_fd(), uinput_sys::EV_SYN);
            uinput_sys::ui_set_evbit(uinput_out_file.as_raw_fd(), uinput_sys::EV_KEY);

            for key in 0..uinput_sys::KEY_MAX {
                uinput_sys::ui_set_keybit(uinput_out_file.as_raw_fd(), key);
            }

            let mut uidev: uinput_user_dev = mem::zeroed();
            uidev.name[0] = 'k' as i8;
            uidev.name[1] = 't' as i8;
            uidev.name[2] = 'r' as i8;
            uidev.name[3] = 'l' as i8;
            uidev.id.bustype = 0x3; // BUS_USB
            uidev.id.vendor = 0x1;
            uidev.id.product = 0x1;
            uidev.id.version = 1;

            let uidev_bytes =
                slice::from_raw_parts(mem::transmute(&uidev), mem::size_of::<uinput_user_dev>());
            uinput_out_file.write(uidev_bytes)?;
            uinput_sys::ui_dev_create(uinput_out_file.as_raw_fd());
        }

        Ok(KbdOut {
            device: uinput_out_file,
        })
    }

    pub fn write(&mut self, event: InputEvent) -> Result<(), io::Error> {
        let ev = event.as_raw();

        unsafe {
            let ev_bytes = slice::from_raw_parts(
                mem::transmute(&ev as *const raw_event),
                mem::size_of::<raw_event>(),
            );
            self.device.write(ev_bytes)?;
        };

        Ok(())
    }

    pub fn write_key(&mut self, key: KeyCode, value: KeyValue) -> Result<(), io::Error> {
        let key_ev = KeyEvent::new(key, value);
        self.write(key_ev.into())?;

        let sync = InputEvent::new(
            &TimeVal {
                tv_sec: 0,
                tv_usec: 0,
            },
            &EventCode::EV_SYN(EV_SYN::SYN_REPORT),
            0,
        );
        self.write(sync.into())?;

        Ok(())
    }

    pub fn press_key(&mut self, key: KeyCode) -> Result<(), io::Error> {
        self.write_key(key, KeyValue::Press)
    }

    pub fn release_key(&mut self, key: KeyCode) -> Result<(), io::Error> {
        self.write_key(key, KeyValue::Release)
    }

    // pub fn tap_key(&mut self, key: KeyCode) -> Result<(), io::Error> {
    //     self.press_key(key.clone())?;
    //     self.release_key(key)?;
    //     Ok(())
    // }
}