code to check player for buff

[Boradan]

What is the code you need to check if a unit("player") has a certain buff?
Woulldnt mind fitting that into my addon to check if the player has any of the following buffs:
Battle Shout,
Horn of Winter,
Kings,
Mark of the Wild,
Well Fed.
Am new to this lua stuff, so any assistance would be appreciated ....

[Rilgamon]

http://www.wowpedia.org/API_UnitAura

UnitAura allows you to check for buffs, debuffs

[Phanx]

Something like this:

--  Make a list of the buffs you want to check for:
local buffs = {
    ["Battle Shout"] = true,
    ["Blessing of Kings"] = true,
    ["Horn of Winter"] = true,
    ["Mark of the Wild"] = true,
    ["Well Fed"] = true,
}
 
------------------------------------------------------------------------
--  Create a frame.
--  Frames are the basic UI objects in WoW.
--  You need them in order to respond to events (things happening in the
--  game) or to show visible elements on the screen (graphics, text,
--  buttons, etc.).
------------------------------------------------------------------------
local frame = CreateFrame("Frame")
 
------------------------------------------------------------------------
--  Register for the UNIT_AURA event.
--  Events are how WoW tells addons that something has happened.
--  The UNIT_AURA event fires whenever any buff or debuff changes on any
--  unit that currently has a unit token (such as player, target, boss1,
--  focustarget, arena3, party2, or raid18pet).
------------------------------------------------------------------------
frame:RegisterEvent("UNIT_AURA")
 
------------------------------------------------------------------------
--  Set an OnEvent handler for the frame.
--  This is a function that will be run each time the frame receives
--  an event for which it has registered.
--  The function recieves a reference to the frame as its first
--  argument (conventionally named "self"), the name of the event
--  as the second argument (conventionally named "event"), and then
--  event-specific data from the third argument onward.
------------------------------------------------------------------------
frame:SetScript("OnEvent", function(self, event, ...)
    --------------------------------------------------------------------
    --  ... is called a vararg, and is a construct that contains any
    --  number of variables. It is used mainly when receiving variables
    --  without knowing how many of them there are. Since different
    --  events pass different numbers of arguments, a vararg is very
    --  common in event handling functions.
    --  Technically you don't need it here, since your frame is only
    --  registered for one event, but if you expand your addon later,
    --  it may become useful.
    --------------------------------------------------------------------
 
    --  Unpack the vararg into the variable(s) it contains:
    local unit = ...
 
    --  If the unit is not "player" you don't care about it, so
    --  you can quit out of the function early to save time:
    if unit ~= "player" then
        return
    end
 
    --  Loop through all of the buffs you want to check for:
    for buff in pairs(buffs) do
        --  Check to see if you have the buff:
        if UnitBuff("player", buff) then
            --  You have the buff.
            --  Do something here.
        else
            --  You don't have the buff.
            --  Do something here.
        end
    end
end)

[Boradan]

Hmmmm ... I think I wasnt specific enough in the original question ...

The addon I have done is up and running on wow interface ( http://www.wowinterface.com/download...enseStats.html )
It is working fine, apart from the fact that it assumes you have no buffs currently when it does all the calculations to output your CTC.
If you get a buff that you can select from the dropdowns, then effectively the buff is added twice to the calculations (these are the only buffs available that will affect your Combat Table Coverage (well, apart from different ranks and the myriad of food buffs that give lower stat rating boosts, but that would need a list faaaaaaar too long to factor into the equations) ....

Heres a pastebin of the lua as it stands:
http://pastebin.com/0prqsJwk

the issue I am running into is the UpdateBuffStats()
from line 336 to line 349

I want to check the player to see if he has any of the buffs you can select in the addon to see your raid buffed stats currently applied, and if so, to change the output of the UpdateBuffStats()

As it stands, the lines in question are :

    local food, strength, stat

    local function UpdateBuffStats()
    
        BuffStrengthAdjust = strength.StrengthValue + food.StrengthValue
        BuffParryAdjust =  food.ParryValue
        BuffDodgeAdjust =  food.DodgeValue
        BuffMasteryAdjust = food.MasteryValue
        BuffMultiplierAdjust = stat.BuffValue

    
        PAPERDOLL_STATINFO["TOTALAVOIDANCE"].updateFunc(Frame1, "player")
        PAPERDOLL_STATINFO["COMBATTABLE"].updateFunc(Frame2, "player")
    end

I need to check if the player has these buffs (it will need to be by spellId as the well fed buffs all return the name 'Well Fed' even though they give different stats .... (stupid way of blizzard doing this IMO)

"Mark of the Wild" = 79061
"Blessing of Kings" = 79063
"Horn of Winter" = 57330
"Battle Shout" = 6673
"Well Fed" = 87554  --Dodge food Buff
"Well Fed" = 87555   --Parry Food Buff
"Well Fed" = 87549   --Mastery Food Buff
"Well Fed" = 87545   --Strength Food Buff

I know WHAT I need to do, but cant, for the life of me incorporate it into the addon.....
Once getting the spellId of all buffs currently on the player (using spellId = UnitAura("player",i) ), the current values for BuffStrengthAdjust, BuffParryAdjust, BuffDodgeAdjust, BuffMasteryAdjust and BufMultiplierAdjust would need to be worked out in the following way:

if  (spellId ~= 79061 and spellId ~= 79063) then BuffMultiplierAdjust = stat.BuffValue else BuffMultiplierAdjust = 1

if  spellId ~= 87549 then BuffMasteryAdjust = food.MasteryValue else BuffMasteryAdjust = 0

if  spellId ~= 87554 then BuffDodgeAdjust = food.DodgeValue else BuffDodgeAdjust = 0

if spellId ~= 87555 then BuffParryAdjust = food.ParryValue else BuffParryAdjust = 0

--this next formula is a bit more complex as there are 3 combinations :(  

if  (spellId ~= 57330 and spellId ~= 6673 and spellId ~= 87545) then BuffStrengthAdjust = strength.StrengthValue + food.StrengthValue
else if (spellId = 57330 or spellId = 6673) and spellId ~= 87545 then BuffStrengthAdjust = food.StrengthValue
else if (spellId ~= 57330 and spellId ~= 6637) and spellId = 87545 then BuffStrengthAdjust = strength.StrengthValue

I have no feckin idea how to get this lot into the lua to factor in the current buffs when working out the new stat values ( I actually DID get it working once, but the values didnt update if the buff disappeared (like Battle shout with its 2 minute cooldown), but much to my chagrin, this poxy village suffered a power cut at that time and I lost the file )

I may be going about this in totally the wrong way, as it may be simpler to factor in the Current buffs when you are selecting the raid buffs from the dropdown menu (though that would be complicated when choosing from the list of food buffs )

Andy

[kaels]

Here's how you would modify Phanx's code to do what you want to do:

local buffs = {
    -- setting the defaults to false so that you can start out assuming the player doesn't have the buff
    ["Battle Shout"] = false,
    ["Blessing of Kings"] = false,
    ["Horn of Winter"] = false,
    ["Mark of the Wild"] = false,
    -- add the spell IDs for food buffs here - you can feed them into UnitBuff with the same syntax as spell names
    87554 = false,
    87555 = false,
    87549 = false,
    87545 = false,
}
 
local frame = CreateFrame("Frame")
 
frame:RegisterEvent("UNIT_AURA")
-- probably want to check for buffs on login as well, I'm not sure if Unit_Aura fires
frame:RegisterEvent("PLAYER_ENTERING_WORLD")
 
frame:SetScript("OnEvent", function(self, event, ...)
    if (unit and unit ~= "player") then
        return
    end
 
    for buff in pairs(buffs) do
        if UnitBuff("player", buff) then
            -- If you have the buff, check to see if it's already been factored in
            if not buffs[buff] then
                -- If it hasn't been factored in, adjust accordingly
                buffs[buff] = true
                AddBuffAdjustment(buff)
            end
        else
            -- If you don't have the buff, check to see if you're still adjusting for it
            if buffs[buff] then
                -- If you're still adjusting for it, remove the adjustment
                buffs[buff] = false
                RemoveBuffAdjustment(buff)
            end
        end
    end
end)
 
local function AddBuffAdjustment(buff)
    if buff == "Battle Shout" then
        -- do whatever you need to do when Battle Shout is added
    elseif buff == "Blessing of Kings" or buff = "Mark of the Wild" then
        -- do whatever you need to do when BoK/Mark is added
    elseif
        -- and so forth
    else
    
    end
end
 
local function RemoveBuffAdjustment(buff)
    if buff == "Battle Shout" then
        -- do whatever you need to do when Battle Shout is removed
    elseif buff == "Blessing of Kings" or buff == "Mark of the Wild" then
        -- do whatever you need to do when BoK/Mark is removed
    elseif
        -- and so forth
    else
    
    end
end

You'll have to calculate a bit differently than you've been doing, but it should actually be simpler.