blub

running = true
blocks = 0

while running == true do

  if turtle.getFuelLevel() <= blocks then
    ref = turtle.refuel(1)
    if ref == false then
      turtle.turnRight()
      turtle.turnRight()
      for i = 0, blocks, 1 do
        turtle.forward()
      end
      running = false
    end

  end
  turtle.dig()
  turtle.turnRight()
  turtle.dig()
  turtle.turnLeft()
  turtle.forward()
  blocks = blocks + 1
end