Track hidden aura?

[CodeDonkey]

I'm trying to figure out how to track if 4pc bonus is active or not using Tell Me When. I've tried playing around with the aura settings and the item setting, I just can't get it to work. Here is the spell I'm trying to track:
http://www.wowhead.com/spell=211045/...frost-4p-bonus
I'm trying to make a full rotation for frost dk's but the rotation changes slightly based on whether you have 4pc or not. Any help would be great

[d87]

i'm pretty sure you can't track it directly

I used to track set pieces for this. It's not TMW tho... Here's the code:

local ItemSetsRegistered = {}

local function TrackItemSet(tiername, itemArray)
    ItemSetsRegistered[tiername] = ItemSetsRegistered[tiername] or {}
    if not ItemSetsRegistered[tiername].items then
        ItemSetsRegistered[tiername].items = {}
        ItemSetsRegistered[tiername].callbacks = {}
        local bitems = ItemSetsRegistered[tiername].items
        for _, itemID in ipairs(itemArray) do
            bitems[itemID] = true
        end
    end
end

local function RegisterSetBonusCallback(tiername, pieces, handle_on, handle_off)
    local tier = ItemSetsRegistered[tiername]
    if not tier then error(string.format("Itemset '%s' is not registered", tiername)) end
    tier.callbacks[pieces] = {}
    tier.callbacks[pieces].equipped = false
    tier.callbacks[pieces].on = handle_on
    tier.callbacks[pieces].off = handle_off
end


local function IsSetBonusActive(tiername, bonuscount)
        local tier = ItemSetsRegistered[tiername]
        local tier_items = tier.items
        local pieces_equipped = 0
        for _, slot in ipairs(tierSlots) do
            local itemID = GetInventoryItemID("player", slot)
            if tier_items[itemID] then pieces_equipped = pieces_equipped + 1 end
        end
        return (pieces_equipped >= bonuscount)
end

local tierSlots = {
    (GetInventorySlotInfo("ChestSlot")),
    (GetInventorySlotInfo("HeadSlot")),
    (GetInventorySlotInfo("ShoulderSlot")),
    (GetInventorySlotInfo("LegsSlot")),
    (GetInventorySlotInfo("HandsSlot")),
}

local setwatcher = CreateFrame("Frame", nil, UIParent)
setwatcher:SetScript("OnEvent", function(self, event, ...)
    return self[event](self, event, ...)
end)

setwatcher:RegisterEvent("PLAYER_LOGIN")

function setwatcher:PLAYER_LOGIN()
    if next(ItemSetsRegistered) then
        self:RegisterUnitEvent("UNIT_INVENTORY_CHANGED", "player")
        self:UNIT_INVENTORY_CHANGED(nil, "player")
    end
end


function setwatcher:UNIT_INVENTORY_CHANGED(event, unit)
    for tiername, tier in pairs(ItemSetsRegistered) do
        local tier_items = tier.items
        local pieces_equipped = 0
        for _, slot in ipairs(tierSlots) do
            local itemID = GetInventoryItemID("player", slot)
            if tier_items[itemID] then pieces_equipped = pieces_equipped + 1 end
        end

        for bp, bonus in pairs(tier.callbacks) do
            if pieces_equipped >= bp then
                if not bonus.equipped then
                    if bonus.on then bonus.on() end
                    bonus.equipped = true
                end
            else
                if bonus.equipped then
                    if bonus.off then bonus.off() end
                    bonus.equipped = false
                end
            end
        end
    end
end

Usage example:

TrackItemSet("Shadow_T15", {
    96674, 96675, 96676, 96677, 96678, --heroic
    95300, 95301, 95302, 95303, 95304, --normal
    95930, 95931, 95932, 95933, 95934, --lfr
})
RegisterSetBonusCallback("Shadow_T15", 2,
    function()
        -- setbonus on
    end,
    function()
        -- setbonus off
    end
)

[CodeDonkey]

This looks damn near exactly what I'm looking for, thanks a bunch