CombatLogFix.lua

local LogFixer = CreateFrame("Frame", "DEFAULT_CHAT_FRAME", UIParent);
local frame, instanceType, lastEvent

function LogFixer:ADDON_LOADED(event, addon)
	if( addon ~= "CombatLogFix" ) then return end
	frame:UnregisterEvent("ADDON_LOADED")
	
	CombatLogFixDB = CombatLogFixDB or {zone = true, auto = true, report = true, wait = false}
	self:CheckEvents()
end

function LogFixer:CheckEvents()
	if( CombatLogFixDB.zone ) then
		frame:RegisterEvent("ZONE_CHANGED_NEW_AREA")
		frame:RegisterEvent("PLAYER_ENTERING_WORLD")
	else
		frame:UnregisterEvent("ZONE_CHANGED_NEW_AREA")
		frame:UnregisterEvent("PLAYER_ENTERING_WORLD")
	end
	
	if( CombatLogFixDB.auto ) then
		frame:RegisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
		frame:RegisterEvent("UNIT_SPELLCAST_SUCCEEDED")
	else
		frame:UnregisterEvent("UNIT_SPELLCAST_SUCCEEDED")
		frame:UnregisterEvent("PLAYER_REGEN_ENABLED")
		frame:UnregisterEvent("COMBAT_LOG_EVENT_UNFILTERED")
		frame:Hide()
	end	
end

-- Clear on zone type change
function LogFixer:ZONE_CHANGED_NEW_AREA()
	local type = select(2, IsInInstance())
	if( instanceType and type ~= instanceType ) then
		CombatLogClearEntries()
	end
	
	instanceType = type
end

LogFixer.PLAYER_ENTERING_WORLD = LogFixer.ZONE_CHANGED_NEW_AREA

-- Queued clear
function LogFixer:PLAYER_REGEN_ENABLED()
	frame:UnregisterEvent("PLAYER_REGEN_ENABLED")
	CombatLogClearEntries()
end

-- When the cast is sent, we expect some sort of combat log event within the next 2
local playerSpells = setmetatable({}, {
	__index = function(tbl, name)
		local cost = select(4, GetSpellInfo(name))
		rawset(tbl, name, not not (cost and cost > 0))
		return rawget(tbl, name)
	end
})

function LogFixer:UNIT_SPELLCAST_SUCCEEDED(event, unit, name, rank, castID)
	if( unit == "player" and name and playerSpells[name] ) then
		frame.timeout = 0.50
		frame:Show()
	end
end

function LogFixer:COMBAT_LOG_EVENT_UNFILTERED()
	lastEvent = GetTime()
end

local function checkTimeout(self, elapsed)
	self.timeout = self.timeout - elapsed
	if( self.timeout > 0 ) then return end
	self:Hide()
	
	-- If the last combat log event was within a second of the cast succeeding, we're fine
	if( lastEvent and ( GetTime() - lastEvent ) <= 1 ) then return end

	-- Try and narrow it down
	if( CombatLogFixDB.report ) then
		if( not throttleBreak or throttleBreak < GetTime() ) then
			LogFixer:Print(string.format("%d filtered/%d events found. Cleared combat log, as it broke. Please report this!", CombatLogGetNumEntries(), CombatLogGetNumEntries(true)))
			throttleBreak = GetTime() + 60
		end
	end
	
	-- Might need to queue the clear
	if( CombatLogFixDB.wait and InCombatLockdown() ) then
		frame:RegisterEvent("PLAYER_REGEN_ENABLED")
	else
		CombatLogClearEntries()
	end
end

-- Slash commands
function LogFixer:Print(msg)
	DEFAULT_CHAT_FRAME:AddMessage(string.format("|cff33ff99Log Fixer|r: %s", msg))
end

frame = CreateFrame("Frame")
frame:RegisterEvent("ADDON_LOADED")
frame:SetScript("OnEvent", function(self, event, ...) LogFixer[event](LogFixer, event, ...) end)
frame:SetScript("OnUpdate", checkTimeout)
frame:Hide()

local optionText = {["zone"] = "Zone clearing", ["auto"] = "Auto clearing", ["report"] = "Message report", ["wait"] = "Wait on clear"}
SLASH_LOGFIXER1 = "/clf"
SLASH_LOGFIXER2 = "/fixer"
SLASH_LOGFIXER3 = "/logfix"
SlashCmdList["LOGFIXER"] = function(msg)
	msg = string.lower(msg or "")
	if( msg == "status" ) then
		LogFixer:Print("Showing set options")
		for key, text in pairs(optionText) do
			if( CombatLogFixDB[key] ) then
				DEFAULT_CHAT_FRAME:AddMessage(string.format("%s is |cff20ff20enabled|r", text))
			else
				DEFAULT_CHAT_FRAME:AddMessage(string.format("%s is |cffff2020disabled|r", text))
			end
		end
		return
	end
	
	-- Show help
	if( not optionText[msg] ) then
		LogFixer:Print("Slash commands")
		DEFAULT_CHAT_FRAME:AddMessage("/logfix zone - Toggles clearing on zone type change")
		DEFAULT_CHAT_FRAME:AddMessage("/logfix auto - Toggles clearing combat log when it breaks")
		DEFAULT_CHAT_FRAME:AddMessage("/logfix wait - Toggles not clearing until you drop combat")
		DEFAULT_CHAT_FRAME:AddMessage("/logfix report - Toggles reporting how many messages were found when it broke")
		DEFAULT_CHAT_FRAME:AddMessage("/logfix status - List of set options")
		return
	end
	
	CombatLogFixDB[msg] = not CombatLogFixDB[msg]
	LogFixer:CheckEvents()
	
	if( CombatLogFixDB[msg] ) then
		LogFixer:Print(string.format("%s is now |cff20ff20enabled|r", optionText[msg]))
	else
		LogFixer:Print(string.format("%s is now |cffff2020disabled|r", optionText[msg]))
	end
end