Turtle Stairs

local args = {...}

if not #args == 2 then
  print("Usage: stairs down <current y, desired y>")
  return
end

local curr = tonumber(args[1])
local goal = tonumber(args[2])+1

for i=goal,curr do
    while not turtle.forward() do turtle.dig() end
    while not turtle.up() do turtle.digUp() end
    while turtle.detectUp() do
      turtle.digUp()
      sleep(0.2)
    end
    while not turtle.down() do turtle.digDown() end
    while turtle.detectDown() do
      turtle.digDown()
      sleep(0.2)
    end
    turtle.down()
    turtle.digDown()
    turtle.turnRight()
    turtle.turnRight()
    turtle.select(1)
    turtle.placeDown()
    turtle.turnRight()
    turtle.turnRight()
end

turtle.turnLeft()
turtle.turnLeft()

for i=goal,curr do
    while not turtle.up() do turtle.digUp() end
    while not turtle.forward() do turtle.dig() end
end

turtle.turnRight()
turtle.turnRight()