Function next_keypress 

pub async fn next_keypress(
    state: &ConsoleState<'static>,
) -> Result<Option<Keypress>>

• Check if stdin is a terminal (libc::isatty == 1)
  • If not, open /dev/tty
• Put the terminal in raw input mode
• Enable TCSADRAIN
• Read a byte
  • If \x1b, csi, so read next byte
    • If next byte is [, start reading control sequence
      • Match next byte
        • A => up
        • B => down
        • C => right
        • D => left
        • H => home
        • F => end
        • Z => shift-tab
        • _ =>
          • Match next byte
            • ~ =>
              • Match next byte
                • 1 => home
                • 2 => insert
                • 3 => delete
                • 4 => end
                • 5 => page up
                • 6 => page down
                • 7 => home
                • 8 => end
                • Else, the escape sequence was unknown
            • Else, the escape sequence was unknown
    • Else, if next byte is not [, bail out on unknown control sequence
    • Else, if there was no next byte, input was
  • Else, if byte & 224u8 == 192u8, Unicode 2-byte
  • Else, if byte & 240u8 == 224u8, Unicode 3-byte
  • Else, if byte & 248u8 == 240u8, Unicode 4-byte
  • Else:
    • If byte == \r || byte == \n,
    • If byte == \t,
    • If byte == \x7f,
    • If byte == \x1b,
    • If byte == \x01,
    • If byte == \x05,
    • If byte == \x08,
    • Else, char = byte
  • Else, if no byte to read:
    • If stdin is a terminal, return None
• Disable TCSADRAIN