function doDoor(close)

	if not(close) then

		for i=1,3 do
			turtle.dig()
			turtle.forward()
		end

		turtle.dig()

		for i=1,3 do
			turtle.back()
		end

		turtle.place()

	else

		turtle.dig()

		for i=1,3 do
			turtle.forward()
		end

		for i=1,3 do
			turtle.place()
			turtle.back()
		end

		turtle.place()

	end
end


turtle.select(1)

local state = (turtle.getItemCount(1) >= 3)
-- true:open false:closed

while true do
	os.pullEvent("redstone")

	doDoor(state)
	state = not(state)
end