Block placer 2x2

function startTunnel(lenght)

	local distance = 0

	for i=1, lenght, 1 do
		checkBlock()
		dig()
		forward()
		checkBlock()
		turnRight(1)
		digUp()
		dig()
		forward()
		checkBlock()
		digUp()
		turnLeft(2)
		forward()
		turnRight(1)

		distance = distance + 1

		print("Distance" .. distance)

	end


end


function dig()
	while turtle.detect() do
		turtle.dig()
	end

	print("dig")
end


function forward()
	while not turtle.forward() do
		turtle.dig()
	end

	turtle.forward()
	print("forward")
end


function checkBlock()

	if turtle.getItemCount(1) > 0 then
		while not turtle.detectDown() do
			turtle.select(1)
			turtle.placeDown()
		end
	else
		print("No Blocks in slot 1!!!!")
		sleep(10)
		checkBlock()
	end

end


function up()
	while turtle.detectUp() do
		turtle.digUp()
	end
	turtle.up()

end


function digUp()
	while turtle.detectUp() do
		turtle.digUp()
	end
	print("dig up")
end



function down()
	while turtle.detectDown() do
		turtle.digDown()
	end
	turtle.down()

end


function digDown()
	while turtle.detectDown() do
		turtle.digDown()
	end

	print("dig down")
end

function turnRight(e)
	for i1=1, e, 1 do
		turtle.turnRight()
	end
end


function turnLeft(e1)
	for i2=1, e1, 1 do
		turtle.turnLeft()
	end
end


print("Lenght: ")
local lenght = read()


startTunnel(lenght)