Automatic Tree Farmer

local saplingSlot = 1
local woodBlockSlot = 9

while true do
    term.clear()
    term.setCursorPos(1,1)
    turtle.select(saplingSlot)
    turtle.place()
    turtle.select(woodBlockSlot)
    while true do
        if turtle.compare() then
            print("Growth detected.")
            break
        end
    end
    turtle.dig()
    os.sleep(0.1)
    print("Moving forward...")
    turtle.forward()
    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
    end
    print("End of tree, returning to dump items...")
    while not turtle.detectDown() do
        turtle.down()
    end
    turtle.back()
    for itr=1, 12 do
          turtle.select(itr)
          if itr ~= saplingSlot then
              if itr == woodBlockSlot then
                   turtle.dropDown(turtle.getItemCount(itr)-1)
              else
                   turtle.dropDown()
              end
          end
    end
    print("All done here, returning to top of loop...")
end