Tomb Guard Soldier

-- Code for a turtle acting as a Guard for the Tomb of the Unknown Soldier

-- Place turtle at northern end of the path (with tomb to it's left), and place
-- fuel in turtle's inventory. If it drops below 100 fuel, it will stop at the
-- northern end of the path, and wait for someone to refuel it, and then
-- auto-resume

while true do
  if turtle.getFuelLevel() < 100 then
    print("Out of fuel! Waiting for more...")
    repeat
      os.sleep(10)
      for i=1,16 do
        turtle.select(i)
        turtle.refuel()
      end
    until turtle.getFuelLevel() >= 100
  end
  os.sleep(21)
  for i=1,21 do
    repeat
      local success = turtle.forward()
    until success
  end
  turtle.turnLeft()
  os.sleep(21)
  turtle.turnLeft()
  os.sleep(21)
  for i=1,21 do
    repeat
      local success = turtle.forward()
    until success
  end
  turtle.turnRight()
  os.sleep(21)
  turtle.turnRight()
end