Computercraft Turtle Advanced Refueler

print("Press 'S' to terminate the script")

function refuel()
 while true do
  turtle.refuel()
  local fuelLevel = turtle.getFuelLevel()
  print(fuelLevel)
  sleep(1)
 end
end


function terminate()
 local event, key = os.pullEvent("key")
 while key == keys.s do
  os.reboot()
 end
end

while true do
parallel.waitForAll(terminate,refuel)
end