Turtle Tree Farm

print( "Put some barrels/chests in Slot 1..." )
print( "...a stack of Oak Saplings in Slot 2" )
print( "...a Hoe of Growth/Bonemeal in slot 3")
print( "Press any key to continue..." )
os.pullEvent("char")

local lvl = 1

turtle.digDown()
turtle.select(1)
turtle.placeDown()

local function ascend()
	turtle.up()
	local lvl = lvl + 1
end
local function descend()
	turtle.down()
	local lvl = lvl - 1
end
local function grow()
	turtle.select(2)
	turtle.place()
	turtle.select(3)
	turtle.place()
	ascend()
end
local function chop()
	turtle.select(4)
	turtle.dig()
	turtle.forward()
	while turtle.detectUp() = true do
		turtle.digUp()
		ascend()
	end
	while lvl > 1 do
		while turtle.detectdown() = true do
			turtle.digDown()
		end
		while turtle.detectdown() = false do
			descend()
		end
	end
	turtle.back()
end
local function unload()
	for i = 3, 16 do
		turtle.select(i)
		turtle.dropDown()
	end
end

for t = 1, 64 do
	grow()
	chop()
	unload()
end