#!/usr/bin/env bash

KEYBOARD_KEXT="/System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCKeyboard.kext/"

countdown() {
  local seconds="$1"
  while [ $seconds -gt 0 ]; do
    sleep 1 &
    echo -n "${seconds}.. "
    seconds=$(( $seconds - 1 ))
    wait
  done
  echo
}

disable_keyboard() {
    sudo kextunload "$KEYBOARD_KEXT" &>/dev/null
    echo "Keyboard disabled."
}

enable_keyboard() {
    sudo kextload "$KEYBOARD_KEXT" &>/dev/null
    echo "Keyboard enabled."
}

# Get/extend sudo up-front for 5 minutes so it doesn't
# expire between the first and second command.
sudo -v
trap enable_keyboard EXIT
disable_keyboard
countdown 30