Lucas

local tArgs = { ... }
if #tArgs ~= 1 then
  print( "usage Lucas <length>" )
  return
end

size = tonumber( tArgs[1] )
if size < 1 then
  print( "length must be positive" )
  return
end

done = 0
slot = 2

while size > 0 do
  turtle.dig()
  turtle.forward()
  turtle.turnLeft()
  turtle.dig()
  turtle.turnRight()
  turtle.turnRight()
  turtle.dig()
  if done >= 8 then
    turtle.select(16)
    turtle.place()
    done = 0
  end
  turtle.turnLeft()
  turtle.digUp()
  turtle.digDown()
  size = size-1
  done = done+1
  while turtle.getItemCount(15) >=1 do
    turtle.select(1)
    turtle.placeDown()
    turtle.select(slot)
    turtle.dropDown()
    slot = slot+1
  end
  turtle.select(1)
  turtle.digDown()
end

print( "finish" )