tree farm turtle program
--[[ Running this script on a turtle with saplings in slot 1, bone-meal in slot 2 and coal in slot 16 and a chest behind the turtle for the wood drop off point will create an automatic tree farm. combining this with a chest to the left of the turtle for sapling replenishment and chest to the right for coal replenishment will ensure a long running automated process.]]

-- This function lays saplings and applies bone-meal
function plant()
	turtle.select(1)				--selects sapling
	turtle.place()					--places sapling
	turtle.select(2)				--selects bone-meal
	turtle.place()					--fertilizes sapling
	turtle.suck()					--picks up any saplings that have fallen
end

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-- This function checks fuel level and refuels
function fuel()
	if turtle.getFuelLevel() < 50 then		--checks fuel level and refuels
		turtle.select(16)
		turtle.refuel(5)			--picks up any saplings that have fallen
	end
	print( turtle.getFuelLevel() .. " fuel left.")	--displays fuel level to user
end

-- This function cuts a column directly above the turtle and then returns to ground level
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function column()
	while turtle.detectUp() == true do 		--cut tree down
		turtle.digUp()
		turtle.up()
		turtle.suck()				--picks up any saplings that have fallen
	end
	while turtle.detectDown() == false do		-- return to ground level
		turtle.down()
		turtle.suck()				--picks up any saplings that have fallen
	end
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end

-- This function moves from start position, runs column and returns to start position
function fell()
	turtle.dig()					--breaks bottom block of tree
	turtle.forward()				--move into gap
	column()					--run column function
	turtle.turnRight()				--return to start
	turtle.turnRight()
	turtle.forward()
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end

-- This function empties all collected wood into chest, checks sapling and fuel supplies and restocks
function empty()
	for j = 3, 15 do				-- empty slots 3 to 15 into chest
		turtle.select(j)
		turtle.drop()
	end
	turtle.turnLeft()
	if turtle.getItemCount(16) < 5 then		-- replenish fuel stocks
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		turtle.select(16)
		turtle.suck(10)
	end
	turtle.turnLeft()
	if turtle.getItemCount(1) < 5 then		--replenish sapling stocks 
		turtle.turnLeft()
		turtle.select(1)
		turtle.suck()
		turtle.turnRight()
	end
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end

-- This function checks to see if the sapling has been fertilized into a full tree
function compare()
	turtle.select(1)
	if turtle.compare() == true then
		return true	-- false could indicate that there is no bonemeal or saplings
	else
		return false  
	end
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end

-- This block triggers the appropriate functions in the correct order.
repeat							--start loop
	fuel()						--check fuel
	plant()						--plant and fertilize tree
	fuel()						--check fuel again
	if compare() == false then			--if tree has grown cut down tree
		fell()
	else 						--if tree hasn't grown display error
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		print("error")
		repeat
			sleep(1)
			turtle.select(2)
		until turtle.getItemCount() > 20	--this will terminate script
	end 
	empty()						--empty harvest and restock fuel and materials
until 1 > 2						-- always false creating infinite loop
tree farm turtle program