build(10)

function build(size)
	while true do
		placeLevel(size)
		turtle.up()
		turtle.up()
		turtle.up()
		turtle.turnRight()
		turtle.turnRight()
	end
end

function placeLevel(size)
	local right = true
	for i = 0, size do
		line(size, endTurn(right))
		right = not right
	end
end

function endTurn(right)
	if right then
		return function()
			turtle.turnRight()
			turtle.forward()
			turtle.turnRight()
		end
	else
		return function()
			turtle.turnLeft()
			turtle.forward()
			turtle.turnLeft()
		end
	end
end

function line(size, last)
	for i = 0, size-1 do
		placeAnd(turtle.forward)
	end
	placeAnd(last)
end

function placeAnd(action)
	findBuildMaterial(4)
	turtle.placeDown()
	action()
end

function findBuildMaterial(id)
	local number = turtle.getSelectedSlot()
	local selected = turtle.getItemDetail(number)
	if selected.id == id and number > 0 then
		return
	end
	for i = id+1, 16 do
		selected = turtle.getItemDetail(i)
		local amount = turtle.getItemAmount(i)
		if selected.id == id then
			turtle.select(i)
			return
		end
	end
end