[BrizonTG]

-- First addon, just mess around and figuring out the API.
 
-- NOTICE: PLEASE SEE 'README.TXT' FOR INFORMATION REGARDING THIS ADDON, COMPLIANT TO
-- [url]https://account.elderscrollsonline.com/add-on-terms[/url]
 
local Addon = 
{
    name,
    inCombat,   
};
 
Addon.name = "test"
 
-----------------------------------------------------------------------------
-- Boilerplate Lua...
-- Here's  our hack to get the 'connect line' back...
 
local AddonManager = {};
function AddonManager:connect(f)
    EVENT_MANAGER:RegisterForEvent(Addon.name, EVENT_ADD_ON_LOADED, f);
end
 
function AddonManager:disconnect()
    EVENT_MANAGER:UnregisterForEvent(Addon.name, EVENT_ADD_ON_LOADED);
end
 
local CombatManager = {};
function CombatManager:connect(f)
    EVENT_MANAGER:RegisterForEvent(Addon.name, EVENT_PLAYER_COMBAT_STATE, f);
end
 
function warn(string)
    d(string);
end
 
function wait(time)
    local init = os.clock() / 100;
    repeat until (os.clock() / 100) > init + time;
end
 
local clock = os.clock
function sleep(n)  -- seconds
  local t0 = clock();
  while clock() - t0 <= n do end --os.clock isn't available, and this crashes anyway if we use GetTimeFromMilliseconds()
end
 
-----------------------------------------------------------------------------
local timer = 0;
local tldgui;   -- Make us our thing...
local lblcntr;
 
function OnPlayerCombatState(event, inCombat)
    if (inCombat ~= Addon.inCombat)
    then
        Addon.inCombat = inCombat;
        tldgui:SetHidden(not inCombat);
    end
    if (inCombat)
        then
            warn("Entering Combat...");
            while (inCombat) do
                timer = timer + 1;
                --if (timer > 0)
                --then
                    lblCounter:SetText("Counter: " .. timer);
                --else
                --  lblCounter:SetText("Entering Combat!");
                --end
                --wait(1); --???? Why is this invalid?
                --sleep();
            end
        else
            warn("Leaving Combat...");
            timer = 0;
    end
end
 
-- Borrowed from the tutorial, hate XML, rather do this.
function Addon:CreateGui()
    tldgui = GetWindowManager():CreateTopLevelWindow("tldgui");
    tldgui:SetDimensions(200, 100);
    tldgui:SetResizeToFitDescendents(true);
    tldgui:SetAnchor(CENTER, GuiRoot, CENTER, 0,0);
    tldgui:SetMovable(true);
    tldgui:SetMouseEnabled(true);
    
    local bdBackdrop = GetWindowManager():CreateControl("bdBackDrop", tldgui, CT_BACKDROP);
    bdBackDrop:SetEdgeColor(0.4,0.4,0.4);
    bdBackDrop:SetCenterColor(0.1,0.1,0.1);
    bdBackDrop:SetAnchor(TOPLEFT, tldgui, TOPLEFT, 0, 0);
    bdBackDrop:SetDimensions(200,100);
    bdBackDrop:SetAlpha(1);
    bdBackDrop:SetDrawLayer(0);
    
    lblCounter = GetWindowManager():CreateControl("lblCounter", tldgui, CT_LABEL)
    lblCounter:SetColor(0.8, 0.8, 0.8, 1);
    lblCounter:SetFont("ZoFontAlert");
    lblCounter:SetScale(1);
    lblCounter:SetWrapMode(TEX_MODE_CLAMP);
    lblCounter:SetDrawLayer(1);
    lblCounter:SetText("Click Counts: 0");
    lblCounter:SetAnchor(CENTER, GuiRoot, CENTER, 0,0);
    lblCounter:SetDimensions(100,25);
end
 
function Addon:Init()
    Addon:CreateGui();
    tldgui:SetHidden(true);
    Addon.inCombat = IsUnitInCombat("player");
    CombatManager:connect(OnPlayerCombatState);
    AddonManager:disconnect();
end
 
AddonManager:connect(Addon.Init);

There's a lot more problems than just wait() here, and I'm still figuring out the differences between ESO's Lua and the implementation of Lua I know.