CC Turtle Tree Farm

function start()
    moveFw(3);

	turtle.turnRight()
	moveFw(1);

	for i=2, 4 do
		if(i%2 == 0) do
			turtle.turnLeft()
        	moveFw(4);
			turtle.turnLeft();
    end
		else
			turtle.turnRight()
			moveFw(4);
			turtle.turnRight();
		end
		plantRow()
	end
end

function plantRow()
	placeTree()

	for i=1, 3 do
		moveFw(3);
		placeTree()
	end
	moveFw(1);
end

function moveFw(distance)
	if distance ~= nil then
		distance = tonumber (distance) -- make it a number
 		for i = 1, distance do
   			turtle.forward()
 		end
	else
 		print ("Did not specify distance.")
	end
end
function placeTree()
	turtle.forward()
	turtle.select(3)
	turtle.place(Sapling)
	turtle.forward()
	turtle.select(4)
	turtle.place(Torch)
end


function refuel()
    turtle.select(16)
    turtle.refuel(20)
end