Automatically keep your MacBook from sleeping, when an eGPU is connected

egpu_wake.sh

#!/bin/bash

function no_sleep {
  if ! [ -n "${last_pid+x}" ]; then
    caffeinate -d &
    last_pid=$! &&
    echo start caffeinate
  fi
  sleep 60
}

function do_sleep {
  [ -n "${last_pid+x}" ] && kill -KILL $last_pid && echo stop caffeinate
  unset last_pid
  sleep 60
}

while true; do
  system_profiler SPDisplaysDataType | grep -i 'Type: External GPU' >/dev/null && no_sleep || do_sleep
done