DynamicFarm

right = 1
turns = 0
args = {...}
width = args[1]
length = args[2]

if #args==2 then
	while true do
		sleep(1)
		for i=1,2 do
			for i=1,width do
				for i=1,length-1 do
					turtle.placeDown()
					turtle.forward()
				end
				turtle.placeDown()
				if turns~=width-1 then
					if (right==1) then
						turtle.turnRight()
						turtle.forward()
						turtle.turnRight()
						right=0
						turns = turns + 1
					else
						turtle.turnLeft()
						turtle.forward()
						turtle.turnLeft()
						right=1
						turns = turns + 1
					end
				else
					turtle.turnRight()
					turtle.turnRight()
				end
			end
			if (width % 2 == 0) then
				right=0
			else
				right=1
			end
			turns=0
		end
		right=1
	end
else
	print('Usage: Farm <width> <length>')
end