stairplus2

refill = function()
	turtle.select(1)
	if turtle.getFuelLevel()  < 50 then
		repeat
			sleep(3)
			turtle.digUp()
			turtle.placeUp()
			turtle.suckUp()
			turtle.refuel(64)
			turtle.dropUp()
			turtle.digUp()
		until turtle.getFuelLevel() > 50
	end
end
lastempty = function()
	turtle.digUp()
	turtle.select(2)
	turtle.placeUp()
	for i = 3, 15, 1
	do
		turtle.select(i)
		turtle.dropUp(64)
	end
	turtle.select(2)
	turtle.digUp()
	turtle.select(1)
end
empty = function()
	if turtle.getItemCount(15) >= 1 then
		turtle.digUp()
		turtle.select(2)
		turtle.placeUp()
		for i = 3, 15, 1
		do
			turtle.select(i)
			turtle.dropUp(64)
		end
		turtle.select(2)
		turtle.digUp()
		turtle.select(1)
	end
end

destroy = function()
	empty()
	turtle.digDown()
	turtle.digUp()
	while turtle.detect() == true do
		turtle.dig()
	end
end

staircasedown = function(start, fin)
	refill()
	for i = fin, start, 1
	do
		destroy()
		refill()
		turtle.forward()
		destroy()
		refill()
		turtle.down()
	end
	turtle.dig()
	lastempty()
end

staircaseup = function(start, fin)
	refill()
	for i = fin, start, 1
	do
		destroy()
		refill()
		turtle.forward()
		destroy()
		refill()
		turtle.up()
	end
	turtle.dig()
	lastempty()
end

term.write("Select Starting Y Coord: ")
local Start = read()
term.write("Select Ending Y Coord: ")
local Fin = read()

if Start > Fin then
	staircasedown(Start, Fin)
elseif Fin > Start
	staircaseup(Start, Fin)
end
print("Mining Complete")