farm till

function tillFarmDown()
    turtle.digDown()
  end

  function tillForward(distance)
    for i = 1, distance do
        tillFarmDown()
        turtle.forward()
    end
end

  function tillBack()
    tillFarmDown()
    turtle.back()
  end

  function forwardTill()
    turtle.forward()
    tillFarmDown()
  end

  function backTill()
    turtle.back()
    tillFarmDown()
  end

  function tillStart()
    tillForward(7)
    tillFarmDown()
    turtle.back()
    turtle.back()
    turtle.turnRight()
    turtle.forward()
    tillForward(2)
    tillFarmDown()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    tillBack()
    tillBack()
    tillBack()
    tillBack()
    tillBack()
    tillBack()
    tillBack()
    tillFarmDown()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
    forwardTill()
    forwardTill()
    turtle.turnRight()
    forwardTill()
    turtle.turnRight()
    forwardTill()
    turtle.turnLeft()
    forwardTill()
    turtle.turnLeft()
    forwardTill()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
    turtle.turnLeft()
  end

tillStart()
turtle.turnLeft()
turtle.forward()
turtle.down()
turtle.down()