Nugget Lever simple help to stack item.

[rcb chief]

I've got this script, which gives me a golden nugg each time I press a lever.
My question is: How can I make it so that whenever I buy a gold nugget it stacks with other gold nuggets. Simple as that.

  ----- Config -----
local config = {
        cost = 100, -- Price
        item_id = 2157, -- item

}

local name = getItemNameById(2157) -- Same as item_id above
----- End Config -----
function onUse(cid, item, fromPosition, itemEx, toPosition)
        if doPlayerRemoveMoney(cid, config.cost) == TRUE then
                local bp = doPlayerAddItem(cid, config.item_id , 1)
                        doSendMagicEffect(fromPosition, CONST_ME_GIFT_WRAPS)
                        doSendAnimatedText(fromPosition, "Exchanged", TEXTCOLOR_RED)
                        doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_RED, "You changed ".. name .."s for ".. config.cost .." gold.")
   
                else
                        doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_BLUE, "You need ".. config.cost .." gold to change coins to  ".. name .."s.")
                end
        return TRUE
end

 

[Critico]

Lib:

function getItemsInContainerById(container, itemid) -- Function By Kydrai
            local items = {}
            if isContainer(container) and getContainerSize(container) > 0 then
                            for slot=0, (getContainerSize(container)-1) do
                                            local item = getContainerItem(container, slot)
                                            if isContainer(item.uid) then
                                                            local itemsbag = getItemsInContainerById(item.uid, itemid)
                                                            for i=0, #itemsbag do
                                                                            table.insert(items, itemsbag[i])
                                                            end
                                            else
                                                            if itemid == item.itemid then
                                                                            table.insert(items, item.uid)
                                                            end
                                            end
                            end
            end
            return items
end
function doPlayerAddItemStacking(cid, itemid, quant) -- by mkalo
    local item = getItemsInContainerById(getPlayerSlotItem(cid, 3).uid, itemid)
    local piles = 0
    if #item > 0 then
            for i,x in pairs(item) do
                    if getThing(x).type < 100 then
                            local it = getThing(x)
                            doTransformItem(it.uid, itemid, it.type+quant)
                            if it.type+quant > 100 then
                                    doPlayerAddItem(cid, itemid, it.type+quant-100)
                            end
                    else
                           piles = piles+1
                    end
            end
    else
            return doPlayerAddItem(cid, itemid, quant)
    end
    if piles == #item then
            doPlayerAddItem(cid, itemid, quant)
    end
end

script

  ----- Config -----
local config = {
        cost = 100, -- Price
        item_id = 2157, -- item

}

local name = getItemNameById(2157) -- Same as item_id above
----- End Config -----
function onUse(cid, item, fromPosition, itemEx, toPosition)
        if doPlayerRemoveMoney(cid, config.cost) == TRUE then
        if isItemStackable(config.item_id) then
	doPlayerAddItemStacking(cid, config.item_id, 1)
	else
	doPlayerAddItem(cid, config.item_id,1)
	end
                        doSendMagicEffect(fromPosition, CONST_ME_GIFT_WRAPS)
                        doSendAnimatedText(fromPosition, "Exchanged", TEXTCOLOR_RED)
                        doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_RED, "You changed ".. name .."s for ".. config.cost .." gold.")
   
                else
                        doPlayerSendTextMessage(cid, MESSAGE_STATUS_CONSOLE_BLUE, "You need ".. config.cost .." gold to change coins to  ".. name .."s.")
                end
        return TRUE
end