tunnel2

args = {...}
if #args < 2 then print("Usage: tunnel2 side len") os.exit() end
side = args[1]
len = tonumber(args[2])
slot = 1

if side == "l" then
	sidef=function()
		turtle.turnLeft()
		turtle.place()
		turtle.turnRight()
	end
elseif side == "r" then
	sidef=function()
		turtle.turnRight()
		turtle.place()
		turtle.turnLeft()
	end
elseif side == "m" then
		sidef= function() end
else
	print("ERROR: Side must be l, r, or m!")
	os.exit()
end

function check()
	if turtle.getItemCount(slot) == 0 then
		slot = slot + 1
		turtle.select(slot)
	end
end

function dig()
	while turtle.detect() do
		turtle.dig()
		sleep(.1)
	end
end

for i=1,len do
	check()
	dig()
	turtle.placeDown()
	sidef()
	turtle.up()
	check()
	dig()
	sidef()
	turtle.up()
	check()
	dig()
	turtle.placeUp()
	sidef()
	turtle.down()
	turtle.down()
	turtle.forward()
end

for i=1,len do
	turtle.back()
end