DiaTunnel

args = { ... }

if args[2] == "left" then
	turn = turtle.turnLeft
else
	if args[2] == "right" then
		turn = turtle.turnRight
	end
end

function forward()
	if turtle.getFuelLevel() == 0 then
		turtle.refuel()
	else
		while turtle.detect() do
			turtle.dig()
		end
		turtle.forward()
		turtle.digUp()
	end
end

for i=0,args[1] do
	forward()
end

forward()
turn()
forward()
forward()
forward()
turn()
forward()