Barrel Bunching

local sortLocations = {
    up = { "minecraft:apple", "minecraft:pufferfish", "minecraft:cookie" },
    down = { "minecraft:paper", "minecraft:barrel" }
}

local function InTable(t, value)
    for i, v in pairs(t) do
        if v == value then
            return true
        end
    end

    return false
end

local function GetBarrel()
    -- get the correct barrel based off of its lore tag
    for slot = 1, 16 do
        if turtle.getItemCount(slot) > 0 then
            local data = turtle.getItemDetail(slot, true)

            if data.lore ~= nil and (data.lore[1] == "The fabled prize awaits at the bottom...") then
                turtle.select(slot)
                turtle.transferTo(1)
                turtle.select(1)

                return true
            end
        end
    end

    return false
end

local function SortDrops()
    -- sort drops from barrel into other barrels (up for cookies and apples and pufferfish bottom for papers and barrels)
    for slot = 1, 16 do
        if turtle.getItemCount(slot) > 0 then
            local data = turtle.getItemDetail(slot, true)

            if not (data.lore ~= nil and data.lore[1] == "The fabled prize awaits at the bottom...") then
                if InTable(sortLocations.down, data.name) then
                    turtle.select(slot)
                    turtle.dropDown()
                end

                if InTable(sortLocations.up, data.name) then
                    turtle.select(slot)
                    turtle.dropUp()
                end
            end
        end
    end
end

while true do
    if turtle.detect() then
        turtle.dig()

        SortDrops()
    end

    if GetBarrel() then
        turtle.place()
    end
end