spruce

local function sapling()

    turtle.suckDown()

    turtle.select(1)
    turtle.placeDown()

end

while true do

    local success, data = turtle.inspect()
    if data.name == "minecraft:spruce_log" then

        turtle.suckUp()

        turtle.down()
        turtle.back()
        turtle.turnLeft()
        turtle.forward()
        turtle.forward()
        turtle.down()

        for i = 1, 5 do
            turtle.suckDown()
        end

        turtle.up()
        turtle.back()
        turtle.back()
        turtle.turnRight()
        turtle.forward()
        turtle.up()

        local side = 0

        turtle.dig()
        turtle.forward()
        turtle.turnLeft()
        turtle.dig()
        turtle.turnRight()

        while turtle.detectUp() do
            turtle.digUp()
            turtle.dig()
            turtle.forward()
            turtle.turnLeft()
            turtle.dig()
            turtle.digUp()
            turtle.up()
            side = side + 1
        end

        while not turtle.detectDown() do
            turtle.down()
        end

        side = side%4
        if side == 1 then
            turtle.turnRight()
            turtle.back()
        elseif side == 2 then
            turtle.forward()
            turtle.turnLeft()
            turtle.forward()
            turtle.turnLeft()
        elseif side == 3 then
            turtle.forward()
            turtle.turnLeft()
        end

        turtle.up()
        sapling()
        turtle.forward()
        sapling()
        turtle.turnLeft()
        turtle.forward()
        sapling()
        turtle.turnLeft()
        turtle.forward()
        sapling()

        turtle.dig()
        turtle.forward()
        turtle.turnLeft()
        turtle.dig()
        turtle.forward()
        turtle.turnLeft()
        turtle.down()

        while turtle.getFuelLevel() < 250 do
            print('refueling...')
            for slot = 2, 16 do
                local item = turtle.getItemDetail(slot)

                if item and item.name == 'minecraft:spruce_log' then
                    turtle.select(slot)
                    turtle.refuel()
                    break
                end

            end
        end

        turtle.turnLeft()
        turtle.turnLeft()

        for slot = 2, 16 do

            turtle.select(slot)
            turtle.drop()

        end

        turtle.turnLeft()
        turtle.turnLeft()
    end

    os.sleep(10)

end