# keyboard scancode table
# ts is NOT a good way to write a driver LMAO
const KBD       = "  1234567890-=  qwertyuiop[]  asdfghjkl;'` \\zxcvbnm,./    "
# same layout, shifted. index 42 (left shift) / 54 (right shift) stay blank.
const KBD_SHIFT = "  !@#$%^&*()_+  QWERTYUIOP{}  ASDFGHJKL:\"~ |ZXCVBNM<>?    "

# 8259 PIC
fn pic_remap() do
  outb(0x20, 0x11)  outb(0xa0, 0x11)
  outb(0x21, 0x20)  outb(0xa1, 0x28)
  outb(0x21, 0x04)  outb(0xa1, 0x02)
  outb(0x21, 0x01)  outb(0xa1, 0x01)
  outb(0x21, 0xff)  outb(0xa1, 0xff)
end
fn pic_unmask(line) outb(0x21, inb(0x21) band (255 bxor (1 shl line)))

# she stroke my keys till i handle
# no fr this is just a key stroke handler
global sh = { line = "", shift = :false }
global on_key = fn(code) do
  # shift: 0x2a/0x36 press,
  #        0xaa/0xb6 release
  # index a blank cell and type a stray space.
  if code == 0x2a do sh.shift = :true  return :nil end
  if code == 0x36 do sh.shift = :true  return :nil end
  if code == 0xaa do sh.shift = :false return :nil end
  if code == 0xb6 do sh.shift = :false return :nil end
  if code >= 128 return :nil # other key releases
  if code == 28 do           # Enter
    puts("\n")
    run(sh.line)
    sh.line = ""
    return :nil
  end
  if code == 14 do           # Backspace
    if sh.line:len() > 0 do
      sh.line = sh.line:sub(0, sh.line:len() - 1)
      puts("\x08 \x08")
    end
    return :nil
  end
  if code < 2 return :nil
  if code >= KBD:len() return :nil
  const ch = if sh.shift KBD_SHIFT[code] else KBD[code]
  if ch == " " and code != 0x39 return :nil
  sh.line ~= ch
  puts(ch)
end