vanilla-wow-addons – Rev 1

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-- GrimoireKeeper.lua

GrimoireKeeperData = {};
local GKOld_MerchantFrame_UpdateMerchantInfo;

function GrimoireKeeper_OnLoad()
        this:RegisterEvent("VARIABLES_LOADED");
        GKOld_MerchantFrame_UpdateMerchantInfo = MerchantFrame_UpdateMerchantInfo;
        MerchantFrame_UpdateMerchantInfo = GrimoireKeeper_ColorMerchantInfo;
end

function GrimoireKeeper_OnEvent(event)
        if event == "VARIABLES_LOADED" then
                this:RegisterEvent("PET_BAR_UPDATE");
        elseif event == "PET_BAR_UPDATE" then 
                GrimoireKeeper_ParsePetSkills();
        end
end

function GrimoireKeeper_ParsePetSkills()
        local hasPetSpells, petToken = HasPetSpells();
        if hasPetSpells ~= nil and petToken == "DEMON" then
                local i = 1;
                local name, rank = GetSpellName(i, BOOKTYPE_PET)
                while name ~= nil do
                        _,_,rank = string.find(rank, "(%d)")
                        if rank == nil then rank = "0" end;
                        GrimoireKeeperData[name] = tonumber(rank);
                        i = i + 1;
                        name, rank = GetSpellName(i, BOOKTYPE_PET);
                end
        else return;
        end
end

function GrimoireKeeper_ColorMerchantInfo()
        GKOld_MerchantFrame_UpdateMerchantInfo();
        local total = GetMerchantNumItems();
        local name, item;
        for i=1, MERCHANT_ITEMS_PER_PAGE, 1 do
                local index = (((MerchantFrame.page - 1) * MERCHANT_ITEMS_PER_PAGE) + i);
                if (index <= total) then
                        item = GetMerchantItemInfo(index);
                        if item == nil then return end;
                        if string.find(item, "Grimoire") then
                                _,_,name, rank = string.find(item, "Grimoire of ([%w%s]+) %(Rank (%d+)%)");
                                if name == nil then _,_,name = string.find(item, "Grimoire of ([%w%s]+)") end;
                                if name ~= nil and GrimoireKeeperData[name] ~= nil then
                                        local itemButton = getglobal("MerchantItem"..i.."ItemButton");
                                        local merchantButton = getglobal("MerchantItem"..i);
                                        if rank ~= nil then rank = tonumber(rank) end;
                                        if (rank == nil) or (rank <= GrimoireKeeperData[name]) then 
                                                SetItemButtonNameFrameVertexColor(merchantButton, 0, 0.75, 0.75);
                                                SetItemButtonSlotVertexColor(merchantButton, 0, 0.75, 0.75);
                                                SetItemButtonTextureVertexColor(itemButton, 0, 0.65, 0.65);
                                                SetItemButtonNormalTextureVertexColor(itemButton, 0, 0.65, 0.65);
                                        end
                                end
                        end
                end
        end
end

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