Harvest 2.0

local i = 1
local x = 1
local y = 1
local z = 0

local function empty()
    for x=1,15 do
        turtle.select(x)
        turtle.dropUp()
    end
end
local function turnAround(y)
	if y%2 == 0 then
		turtle.turnLeft()
		turtle.forward()
		turtle.turnLeft()
		turtle.dig()
	end
	if y%2 == 1 then
		turtle.turnRight()
		turtle.forward()
		turtle.turnRight()
		turtle.dig()

	end
end
local function goHome(y)
	turtle.up()
	if y%2 == 1 then
		turtle.turnRight()
		turtle.turnRight()
	end
	repeat turtle.forward()
	until turtle.forward()== false
	turtle.turnRight()
	repeat turtle.forward()
	y = y - 1
	until y == 1
	turtle.turnRight()
end
local function till()
	repeat
		turtle.dig()
		turtle.forward()
		turtle.select(16)
	until turtle.compareDown()
	turnAround(y)
end
local function endOfPlotCheck()
	turtle.select(16)
	if turtle.compareDown() == true then
		turtle.forward()
		if turtle.compareDown() == true then
		 turtle.forward()
		 if turtle.compareDown() == true then
			return true
		 end
		end
	end
end
while true do

turtle.select(1)
rednet.open("right")
local senderId, msg = rednet.receive()

if msg == "harvest" then
	turtle.forward()
	turtle.digDown()
	turtle.down()
	repeat
		till()
		y = y + 1
	until endOfPlotCheck()
	goHome(y)
	empty()
	os.reboot()
end
end