farmer 1.2

local arg1, arg2 = ...
limX = arg1
limZ = arg2
area = limX * limZ
relX = 0
relZ = 0
facing = 0

function plant()
	if turtle.detectDown()
	then
		return false
	end
	turtle.down()
	seeds = selectSeeds()
	if not seeds
	then
		return false
	end
	turtle.placeDown()
	return true

function selectSeeds()
	for i = 0, 15, 1
	do
		turtle.select(i)
		name = turtle.getItemDetail().name
		if name == "minecraft:seeds"
		then
			return true
		end
	end
	return false

function harvest()
	if turtle.detectDown()
	then
		local success, data = turtle.inspectDown()
		if data.name == "minecraft:wheat"
		then
			if data.metadata == 7
			then
				turtle.digDown()
			end
		end
	end

function turnTo(dir)
	if facing > dir
	then
		turtle.turnRight()
		dir -= 1
		turnTo(dir)
	end
	if facing < dir
	then
		turtle.turnLeft()
		dir += 1
		turnTo(dir)
	end
	if facing == dir
	then
		return
	end

function goUp()
	turnTo(0)
	turtle.moveForward()
	relZ = relZ + 1

function goDown()
	turnTo(2)
	turtle.moveForward()
	relZ = relZ - 1

function goLeft()
	turnTo(1)
	turtle.moveForward()
	relX = relX - 1

function goRight()
	turnTo(3)
	turtle.moveForward()
	relX = relX + 1

function walkField()
	while relZ <= limZ
	do
		goUp()
		while relX <= limX
		do
			goRight()
			harvest()
			plant()
		end
		goUp()
		while relX > 1
		do
			goLeft()
			harvest()
			plant()
		end
	end

function returnToOrigin()
	while relX > 0
	do
		goLeft()
	end
	while relY > 0
		goDown()
	end

function depositItems()
	for i = 0, 15, 1
	do
		turtle.drop()
	end

function grabSeeds()
	turtle.suckDown(area)

function execute()
	walkField()
	returnToOrigin()
	depositItems()
	grabSeeds()
	turnTo(0)

function main()
	while (true)
	do
		if redstone.getInput("left")
		then
			execute()
		end
	end