startup

quarry = peripheral.wrap("front")

move = 10

function bdig()
  while turtle.detect() do

    turtle.dig()

  end
end

function buildUp()

  moveToQuarry()

  turtle.turnLeft()
  bdig()
  turtle.forward()
  turtle.select(3)
  turtle.placeDown()
  turtle.back()
  turtle.select(1)
  turtle.place()

  turtle.select(4)
  turtle.turnRight()
  turtle.turnRight()
  bdig()
  turtle.place()
  turtle.turnLeft()
  turtle.turnLeft()


  turtle.digUp()
  turtle.up()
  bdig()
  turtle.select(2)
  turtle.place()

  turtle.down()

  turtle.turnLeft()

  moveToQuarry()

  turtle.select(1)
  turtle.dropUp()
  turtle.turnRight()
  bdig()
  turtle.turnRight()
  turtle.turnRight()
  turtle.select(4)
  bdig()
  turtle.turnLeft()

  moveToQuarry()
  turtle.turnLeft()

end


function moveToQuarry()

  for i = 0, move do

    if turtle.detect() then

      bdig()

    end

    if turtle.detectUp() then

      turtle.digUp()

    end

    turtle.forward()

  end


end

function buildDown()

  bdig()
  turtle.down()

  turtle.turnRight()


end

function routine()

  quarry = peripheral.wrap("front")

  while true do

    while (quarry.hasWork()) do

      os.sleep(5)

    end

    turtle.up()

    for i = 2, 16 do


      if not ((i == 3) or (i == 4))then

        turtle.select(i)
        turtle.drop()

      end

    end

    turtle.select(2)

    buildDown()

    buildUp()

  end

end

if not quarry then

  buildUp()
  quarry = peripheral.wrap("front")
  routine()

else

  routine()

end