add TargetCast support in Classic (#8)

This change adds support for using LibCasterCasterino to get your
target's casting info to enable the TargetCast module. It's not as
clean as the newer retail native calls but works well enough for
most interrupts.

Note: because LibCasterCasterino is using combat log events to get
casting info if a spell cast starts and is immediately cancelled or
interrupted the log may not get updated and the cast bar will zombie
complete.

LibCasterCasterino can be found at:

https://github.com/rgd87/LibClassicCasterino

IceCastBar.lua

@@ -23,6 +23,19 @@ if IceHUD.WowClassic then
 	UnitChannelInfo = ChannelInfo
 end
 
+-- Fulzamoth 2019-09-27 : Use LibClassicCasterino if it's there so we can use TargetCast 
+--                        module in Classic WoW
+if IceHUD.WowClassic then
+	LibClassicCasterino = LibStub("LibClassicCasterino", true)
+	UnitCastingInfo = function(unit)
+		return LibClassicCasterino:UnitCastingInfo(unit)
+	end
+	UnitChannelInfo = function(unit)
+		return LibClassicCasterino:UnitChannelInfo(unit)
+	end
+end
+-- end Fulzamoth change
+
 local AuraIconWidth = 20
 local AuraIconHeight = 20
 
@@ -46,21 +59,55 @@ end
 function IceCastBar.prototype:Enable(core)
 	IceCastBar.super.prototype.Enable(self, core)
 
-	self:RegisterEvent("UNIT_SPELLCAST_SENT", "SpellCastSent") -- "player", spell, rank, target
+	-- Fulzamoth 2019-09-27 : LibClassicCasterino support
-	self:RegisterEvent("CURRENT_SPELL_CAST_CHANGED", "SpellCastChanged")
+	--                        Setup callback to the library, and route events to
-	self:RegisterEvent("UNIT_SPELLCAST_START", "SpellCastStart") -- unit, spell, rank
+	--                        IceHUD's handler functions.
-	self:RegisterEvent("UNIT_SPELLCAST_STOP", "SpellCastStop") -- unit, spell, rank
+	if LibClassicCasterino then
+			local CastbarEventHandler = function(event, ...) -- unitTarget, castGUID, spellID
+				if (event == "UNIT_SPELLCAST_START") then
+					return IceCastBar.prototype.SpellCastStart(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_DELAYED") then
+					return IceCastBar.prototype.SpellCastDelayed(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_STOP") then
+					return IceCastBar.prototype.SpellCastStop(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_FAILED") then
+					return IceCastBar.prototype.SpellCastFailed(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_INTERRUPTED") then
+					return IceCastBar.prototype.SpellCastInterrupted(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_CHANNEL_START") then
+					return IceCastBar.prototype.SpellCastChannelStart(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_CHANNEL_UPDATE") then
+					return IceCastBar.prototype.SpellCastChannelUpdate(self, event, ...)
+				elseif (event == "UNIT_SPELLCAST_CHANNEL_STOP") then
+					return IceCastBar.prototype.SpellCastChannelStop(self, event, ...)
+				end
+			end
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_START", CastbarEventHandler) 
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_DELAYED", CastbarEventHandler) -- only for player
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_STOP", CastbarEventHandler)
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_FAILED", CastbarEventHandler)
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_INTERRUPTED", CastbarEventHandler)
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_CHANNEL_START", CastbarEventHandler)
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_CHANNEL_UPDATE", CastbarEventHandler) -- only for player
+			LibClassicCasterino.RegisterCallback(self,"UNIT_SPELLCAST_CHANNEL_STOP", CastbarEventHandler)
+	else -- No LibClassicCasterino, or we're not on Classic, so use IceHUD's normal event handlers.
 
-	self:RegisterEvent("UNIT_SPELLCAST_FAILED", "SpellCastFailed") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_SENT", "SpellCastSent") -- "player", spell, rank, target
-	self:RegisterEvent("UNIT_SPELLCAST_INTERRUPTED", "SpellCastInterrupted") -- unit, spell, rank
+		self:RegisterEvent("CURRENT_SPELL_CAST_CHANGED", "SpellCastChanged")
+		self:RegisterEvent("UNIT_SPELLCAST_START", "SpellCastStart") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_STOP", "SpellCastStop") -- unit, spell, rank
 
-	self:RegisterEvent("UNIT_SPELLCAST_DELAYED", "SpellCastDelayed") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_FAILED", "SpellCastFailed") -- unit, spell, rank
-	self:RegisterEvent("UNIT_SPELLCAST_SUCCEEDED", "SpellCastSucceeded") -- "player", spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_INTERRUPTED", "SpellCastInterrupted") -- unit, spell, rank
 
-	self:RegisterEvent("UNIT_SPELLCAST_CHANNEL_START", "SpellCastChannelStart") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_DELAYED", "SpellCastDelayed") -- unit, spell, rank
-	self:RegisterEvent("UNIT_SPELLCAST_CHANNEL_UPDATE", "SpellCastChannelUpdate") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_SUCCEEDED", "SpellCastSucceeded") -- "player", spell, rank
-	self:RegisterEvent("UNIT_SPELLCAST_CHANNEL_STOP", "SpellCastChannelStop") -- unit, spell, rank
 
+		self:RegisterEvent("UNIT_SPELLCAST_CHANNEL_START", "SpellCastChannelStart") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_CHANNEL_UPDATE", "SpellCastChannelUpdate") -- unit, spell, rank
+		self:RegisterEvent("UNIT_SPELLCAST_CHANNEL_STOP", "SpellCastChannelStop") -- unit, spell, rank
+
+	end
 	self:Show(false)
 end
 
@@ -371,8 +418,11 @@ function IceCastBar.prototype:StartBar(action, message)
 		end
 	end
 
-	if not spell then
+	-- Fulzamoth 2019-09-27 : LibClassicCasterino won't return spell info on target's failed or interrupted cast
-		return
+	if LibClassicCasterino and not spell then
+		self:StopBar()
+	elseif not spell then
+	  return
 	end
 
 	if icon ~= nil then

modules/TargetCast.lua

@@ -65,7 +65,12 @@ function TargetCast.prototype:GetDefaultSettings()
 	settings["side"] = IceCore.Side.Right
 	settings["offset"] = 3
 	settings["flashInstants"] = "Never"
-	settings["flashFailures"] = "Never"
+	-- Fulzamoth 2019-09-27 : let the flash handler work if in Classic and LibClassicCasterino exists
+	if LibClassicCasterino then
+		settings["flashFailures"] = ""
+	else
+		settings["flashFailures"] = "Never"
+	end 
 	settings["shouldAnimate"] = false
 	settings["hideAnimationSettings"] = true
 	settings["usesDogTagStrings"] = false
@@ -197,7 +202,8 @@ end
 -------------------------------------------------------------------------------
 
 
+-- Fulzamoth 2019-09-27 : load in Classic if LibClassicCasterino exists
 -- Load us up
-if not IceHUD.WowClassic then
+if not IceHUD.WowClassic or LibClassicCasterino then
 	IceHUD.TargetCast = TargetCast:new()
 end