moros 0.12.0

MOROS: Obscure Rust Operating System
Documentation 
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use crate::api;
use crate::sys;

use core::sync::atomic::{AtomicBool, Ordering};
use pc_keyboard::{
    layouts, DecodedKey, Error, HandleControl, KeyCode, KeyEvent, KeyState,
    Keyboard, ScancodeSet1,
};
use spin::Mutex;
use x86_64::instructions::port::Port;

pub static KEYBOARD: Mutex<Option<KeyboardLayout>> = Mutex::new(None);

pub static ALT: AtomicBool = AtomicBool::new(false);
pub static CTRL: AtomicBool = AtomicBool::new(false);
pub static SHIFT: AtomicBool = AtomicBool::new(false);

pub enum KeyboardLayout {
    Azerty(Keyboard<layouts::Azerty, ScancodeSet1>),
    Dvorak(Keyboard<layouts::Dvorak104Key, ScancodeSet1>),
    Qwerty(Keyboard<layouts::Us104Key, ScancodeSet1>),
}

impl KeyboardLayout {
    fn add_byte(&mut self, scancode: u8) -> Result<Option<KeyEvent>, Error> {
        match self {
            KeyboardLayout::Azerty(kb) => kb.add_byte(scancode),
            KeyboardLayout::Dvorak(kb) => kb.add_byte(scancode),
            KeyboardLayout::Qwerty(kb) => kb.add_byte(scancode),
        }
    }

    fn process_keyevent(&mut self, event: KeyEvent) -> Option<DecodedKey> {
        match self {
            KeyboardLayout::Azerty(kb) => kb.process_keyevent(event),
            KeyboardLayout::Dvorak(kb) => kb.process_keyevent(event),
            KeyboardLayout::Qwerty(kb) => kb.process_keyevent(event),
        }
    }

    fn from(name: &str) -> Option<Self> {
        match name {
            "azerty" => Some(KeyboardLayout::Azerty(Keyboard::new(
                ScancodeSet1::new(),
                layouts::Azerty,
                HandleControl::MapLettersToUnicode,
            ))),
            "dvorak" => Some(KeyboardLayout::Dvorak(Keyboard::new(
                ScancodeSet1::new(),
                layouts::Dvorak104Key,
                HandleControl::MapLettersToUnicode,
            ))),
            "qwerty" => Some(KeyboardLayout::Qwerty(Keyboard::new(
                ScancodeSet1::new(),
                layouts::Us104Key,
                HandleControl::MapLettersToUnicode,
            ))),
            _ => None,
        }
    }
}

pub fn set_keyboard(layout: &str) -> bool {
    if let Some(keyboard) = KeyboardLayout::from(layout) {
        *KEYBOARD.lock() = Some(keyboard);
        true
    } else {
        false
    }
}

pub fn init() {
    set_keyboard(option_env!("MOROS_KEYBOARD").unwrap_or("qwerty"));
    sys::idt::set_irq_handler(1, interrupt_handler);
}

fn read_scancode() -> u8 {
    let mut port = Port::new(0x60);
    unsafe { port.read() }
}

fn send_key(c: char) {
    sys::console::key_handle(c);
}

fn send_csi(code: &str) {
    send_key('\x1B'); // ESC
    send_key('[');
    for c in code.chars() {
        send_key(c);
    }
}

fn interrupt_handler() {
    if let Some(ref mut keyboard) = *KEYBOARD.lock() {
        let scancode = read_scancode();
        if let Ok(Some(event)) = keyboard.add_byte(scancode) {
            let ord = Ordering::Relaxed;
            match event.code {
                KeyCode::LAlt | KeyCode::RAltGr => {
                    ALT.store(event.state == KeyState::Down, ord)
                }
                KeyCode::LShift | KeyCode::RShift => {
                    SHIFT.store(event.state == KeyState::Down, ord)
                }
                KeyCode::LControl | KeyCode::RControl => {
                    CTRL.store(event.state == KeyState::Down, ord)
                }
                _ => {}
            }
            let is_alt = ALT.load(ord);
            let is_ctrl = CTRL.load(ord);
            let is_shift = SHIFT.load(ord);
            if let Some(key) = keyboard.process_keyevent(event) {
                match key {
                    // Ctrl + Alt + Del
                    DecodedKey::Unicode('\u{7f}') if is_alt && is_ctrl => {
                        api::power::reboot()
                    }

                    // [Ctrl +] [Shift +] Tab
                    DecodedKey::Unicode('\t') => {
                        if is_ctrl {
                            if is_shift {
                                send_csi("1;6I")
                            } else {
                                send_csi("1;5I")
                            }
                        } else {
                            if is_shift {
                                send_csi("Z") // Backtab
                            } else {
                                send_key('\t') // Tab
                            }
                        }
                    }

                    DecodedKey::RawKey(KeyCode::ArrowUp) => send_csi("A"),
                    DecodedKey::RawKey(KeyCode::ArrowDown) => send_csi("B"),
                    DecodedKey::RawKey(KeyCode::ArrowRight) => send_csi("C"),
                    DecodedKey::RawKey(KeyCode::ArrowLeft) => send_csi("D"),

                    DecodedKey::RawKey(KeyCode::PageUp) => send_csi("5~"),
                    DecodedKey::RawKey(KeyCode::PageDown) => send_csi("6~"),

                    DecodedKey::Unicode(c) => send_key(c),

                    _ => {}
                };
            }
        }
    }
}