Farm

local arg = {...}

local crop = arg[1]
local timeout = 800
local cycles = 0
local length = 0
local travel = 0

while true do
    local success, data = turtle.inspectDown()

    if data.state ~= nil then
        if data.name == 'minecraft:stone' then
            turtle.turnRight()
        end

        if data.name == 'minecraft:planks' then
            turtle.turnLeft()
        end

        if data.name == 'minecraft:stonebrick' then
            print('Found a stone block! Unloading and sleeping '..timeout..' seconds...')
            if turtle.detectUp() then
                for n = 3, 16, 1 do
                    turtle.select(n)
                    turtle.dropUp()
                end
            end
            sleep(timeout)
            cycles = cycles + 1
            length = math.max(length, travel)
            print (cycles..' CYCLE')
            if turtle.getItemCount(1) < length/80 then
                print('Waiting for fuel')
            end
            while turtle.getItemCount(1) < length/80 do
                sleep(1)
            end
        end

        if data.state.age == 7 then
            print('Found a grown crop! Harvesting...')
            turtle.digDown('right')
        end
    end

    if not turtle.detectDown() then
        print('Is this an empty spot? Tilling and replanting...')
        turtle.digDown('right')
        turtle.select(2)
        turtle.placeDown()
    end

    if turtle.getFuelLevel() < 1 then
        print('Out of fuel! Refuelling...')
        turtle.select(1)
        turtle.refuel(1)
    end

    turtle.forward()
    travel = travel + 1
end