--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader/DependencyLoader.toc	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,11 @@
+## Interface: 40000
+
+## Notes: Bootstrap for DependencyLoader_Core
+## Author: mckenziemc
+
+## LoadManagers: !!!LoadFirst, AddonLoader
+## X-LoadFirst: true
+## X-LoadOn-Always: true
+
+
+start.xml

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader/bootstrap.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,36 @@
+--	bootstrap.lua
+--	Bootstrap code for DependencyLoader, allowing 
+--	the user to successfully load it without 
+--	explicitly enabling its own dependencies.
+
+
+local addonName, addonTable = ...
+
+--	TODO: move and use dependency parsing function here?
+local dependencies = {"LibStub", "LibPrint-1.0", "Ace3"}
+
+local canLoad = true
+for _, addon in pairs(dependencies) do
+	local reason = select(6, GetAddOnInfo(addon))
+	
+	if reason ~= nil and reason ~= "DISABLED" then
+		canLoad = false
+		break
+	end
+end
+
+if not canLoad then
+	print("Can't load DependencyLoader")
+	return
+end
+
+
+print("Loading DependencyLoader")
+
+for _, addon in pairs(dependencies) do
+	EnableAddOn(addon)
+end
+
+EnableAddOn("DependencyLoader_Core")
+LoadAddOn("DependencyLoader_Core")
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader/start.xml	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,1 @@
+<Ui xsi:schemaLocation="http://www.blizzard.com/wow/ui/ ..\FrameXML\UI.xsd">
  <Script file="bootstrap.lua"/>
</Ui>
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/Addon.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,152 @@
+--	Addon
+--	Represents individual addon modules
+
+
+local addonName, addonTable = ...
+
+print("running Addon.lua")
+
+--	NOTE: I assume that the API addon functions are 
+--	slightly quicker with an index than with a number.
+
+--	TODO: modify the dependency stuff to use the Errata module if available
+
+local Addon, addon = addonTable:NewClass("Addon")
+
+function Addon:New(id)
+	assert(type(id) == "number" or type(id) == "string")
+
+	local instance = {}
+	
+	setmetatable(instance, self.instanceMetatable)
+	
+	if type(id) == "number" then
+		--	TODO: make sure it's in range
+		instance.index = id
+		instance.name = GetAddOnInfo(id)
+	else
+		--	FIXME: allow blizzard addons?
+		local index
+		
+		for i=1,GetNumAddOns() do
+			if GetAddOnInfo(i) == id then
+				index = i
+				break
+			end
+		end
+		
+		if index then
+			instance.name = GetAddOnInfo(id)
+			instance.index = index
+		else
+			error("Addon not found")
+		end
+	end
+	
+	return instance
+end
+
+
+--	Checks if an addon exists with the specified name.
+--	@param	addon	Name of the addon.
+--	@return			True if the addon is present, false otherwise.
+function Addon:Exists(addon)
+	if type(addon) == "number" then
+		if addon >= 1 and addon <= GetNumAddOns() then
+			return true
+		else
+			return false
+		end
+	elseif type(addon) == "string" then
+		local status = select(6, GetAddOnInfo(addon))
+		
+		if status == "MISSING" then
+			return false
+		else
+			return true
+		end
+	else
+		error()
+	end
+end
+
+
+function addon:GetName()
+	return self.name
+end
+
+
+function addon:GetIndex()
+	return self.index
+end
+
+
+function addon:IsEnabled()
+	--	FIXME: written while tired; review later
+	local status = select(6, GetAddOnInfo(self.index))
+	
+	if status == "DISABLED"	then
+		return false
+	else
+		return true
+	end
+end
+
+--	FIXME: an addon may be present but unloadable if loading out of date addons is disabled.
+--	NOTE: CanForceLoad and CanLoD don't check the status of dependencies
+
+function addon:CanForceLoad()
+	return true		--	TODO: check if there's any reason addons can't be forceloaded
+end
+
+function addon:CanLoD()
+	--	FIXME: what will the client say about addons using LoadManagers if the LM was force-loaded?
+	if IsAddOnLoadOnDemand(self.name) then
+		return true
+	else
+		return false
+	end
+end
+
+--	NOTE: only call for LoD, not force-loading
+function addon:Load()
+	assert(self:CanLoD())
+	
+	EnableAddOn(self.name)
+	LoadAddOn(self.name)
+end
+
+function addon:ForceLoad()
+	assert(self:CanForceLoad())
+	--	TODO: make sure force-loading is available at this time
+	
+	EnableAddOn(self.name)	--	This should cause the game to also load this addon
+end
+
+
+function addon:GetDependencies()
+	return GetAddOnDependencies(self.index)
+end
+
+
+function addon:GetEmbeds()
+	local embeds = {}
+	
+	local embedString = GetAddOnMetadata(self.name, "X-Embeds")
+	
+	if embedString then
+		for match in string.gmatch(embedString, "[^,%s]+") do
+			table.insert(embeds, match)
+		end
+	end
+	
+	return unpack(embeds)
+end
+
+function addon:IsLoaded()
+	if IsAddOnLoaded(self.index) then
+		return true
+	else
+		return false
+	end
+end

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/Core.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,298 @@
+
+
+local addonName, addonTable = ...
+
+
+print("running Core.lua")
+
+--	TODO: prevent infinite loops in the recursive functions
+
+
+local Core, core = addonTable:NewClass("Core")
+
+local Addon = addonTable.classes.Addon
+
+function Core:New()
+	local instance = {}
+	setmetatable(instance, self.instanceMetatable)
+	
+	instance.addons = {}
+	instance.nameToIndex = {}
+	
+	for i=1,GetNumAddOns() do
+		local newAddon = Addon:New(i)
+		
+		instance.addons[i] = newAddon
+		instance.nameToIndex[newAddon:GetName()] = i
+	end
+	
+	--	TODO: enable dependencies for any addons that have already loaded
+	
+	return instance
+end
+
+
+--	@param	addon	Name or index of the addon to retrieve.
+--	@return 		The addon object, or nil if not found
+function core:GetAddon(addon)
+	if not Addon:Exists(addon) then
+		return nil
+	end
+	
+	local index
+
+	if type(addon) == "string" then
+		index = self.nameToIndex[addon]
+	elseif type(addon) == "number" then
+		index = addon
+	end
+	
+	return self.addons[index]
+end	
+
+
+--	Checks if the tree rooted at the specified addon can be force-loaded.
+--	@param	root	The name or index of the root addon.
+function core:CanForceLoadTree(root)
+	--	convert root to an Addon object
+	root = self:GetAddon(root)
+	assert(root)
+	
+	if root:IsLoaded() then
+		return true
+	end
+	
+	--	check if the root itself can be force-loaded
+	if not root:CanForceLoad() then
+		return false
+	end
+	
+	--	now check dependencies recursively
+	--	FIXME: prevent infinite recursion
+
+	local dependencies = {root:GetDependencies()}
+	for i, depName in pairs(dependencies) do
+		local dep = self:GetAddon(depName)
+		
+		if dep == nil then
+			return false		--	missing dependency
+		end
+		
+		--	if it's already loaded then skip to next one
+		if not dep:IsLoaded() then
+			if not self:CanForceLoadTree(depName) then
+				return false
+			end
+		end
+	end
+	
+	return true
+end
+
+--	NOTE: any tree that can be loaded on demand is also eligible for force-loading
+--	Checks if the tree rooted at the specified addon can be loaded on demand.
+--	@param	root	The name or index of the root addon.
+function core:CanLoDTree(root)
+	root = self:GetAddon(root)
+	assert(root)
+
+	--	since this will be used recursively, return true if 
+	--	this is already loaded.
+	if root:IsLoaded() then
+		return true
+	end
+	
+	--	true if all dependencies are loaded or LoD
+	
+	if not root:CanLoD() then
+		return false
+	end
+	
+	--	now check dependencies recursively
+	local dependencies = {root:GetDependencies()}
+	for i, depName in pairs(dependencies) do
+		local dep = self:GetAddon(depName)
+		
+		if not dep then
+			return false		--	missing
+		end
+		
+		if not dep:IsLoaded() then
+			if not self:CanLoDTree(depName) then
+				return false
+			end
+		end
+	end
+	
+	return true
+end
+
+
+--	Checks if the tree rooted at the specified addon 
+--	can be loaded if all dependencies are enabled 
+--	the UI is reloaded.
+--	Basically makes sure all dependencies are installed.
+function core:CanReloadTree(root)
+	--	convert root to an Addon object
+	root = self:GetAddon(root)
+	assert(root)
+	
+	if root:IsLoaded() then
+		return true
+		--	FIXME: 	deps may have been disabled
+	end
+	
+	--	TODO: make sure the root isn't incompatible
+	
+	--	now check dependencies recursively
+	--	FIXME: prevent infinite recursion
+
+	local dependencies = {root:GetDependencies()}
+	for i, depName in pairs(dependencies) do
+		local dep = self:GetAddon(depName)
+		
+		if dep == nil then
+			return false		--	missing dependency
+		end
+
+		--	TODO: make sure it's compatible
+	end
+	
+	return true
+end
+
+--	Loads the tree rooted at the specified addon.
+--	FIXME: load the root too or not?
+--	Supports both LoD addons and those that require force-loading.
+function core:LoadTree(addon)
+	--	don't check if the tree can actually be loaded.
+	--	external code should do that itself to check if it 
+	--	should even call this at all.
+
+	if self:ForceLoadAvailable() then
+		--	LoD trees can also be force-loaded
+		self:ForceLoadTree(addon)
+	else
+		self:LoadLoDTree(addon)
+	end
+end
+
+
+--	load the root too, since it may actually be a leaf
+function core:ForceLoadTree(root)
+	root = self:GetAddon(root)
+	assert(root)
+	
+	--	load dependencies
+	local dependencies = {root:GetDependencies(addon)}
+	for i, depName in pairs(dependencies) do
+		self:ForceLoadTree(depName)
+	end
+
+	--	load embeds, if they are available separately
+	local embeds = {root:GetEmbeds(addon)}
+	for i, embedName in pairs(embeds) do
+		if Addon:Exists(embedName) then
+			self:ForceLoadTree(embedName)
+		end
+	end
+	
+	root:ForceLoad()
+end
+
+
+function core:LoadLoDTree(root)
+	root = self:GetAddon(root)
+	assert(root)
+	
+	--	load dependencies
+	local dependencies = {root:GetDependencies(addon)}
+	for i, depName in pairs(dependencies) do
+		self:LoadLoDTree(depName)
+	end
+
+	--	load embeds, if they are available separately
+	local embeds = {root:GetEmbeds(addon)}
+	for i, embedName in pairs(embeds) do
+		if Addon:Exists(embedName) then
+			self:LoadLoDTree(embedName)
+		end
+	end
+	
+	root:LoD()
+end
+
+
+--	I think the problem this solves is a major issue with 
+--	migrating to separate libs. think about it more and document 
+--	here and in project description
+function core:PrepareLoDTree(root)
+	root = self:GetAddon(root)
+	assert(root)
+	
+	--	assume root is LoD
+	
+	--	check dependencies
+	local dependencies = {root:GetDependencies(addon)}
+	for i, depName in pairs(dependencies) do
+		local dep = self:GetAddon(depName)
+		
+		--	assume external code made sure it exists
+		
+		if dep:CanLoD() then
+			--	don't load it now but make sure its dependencies are prepared
+			self:PrepareLoDTree(depName)
+		else
+			--	FIXME: if it's already loaded
+			--	force-load it now so we can load the parent on demand
+			self:ForceLoadTree(depName)
+		end
+	end
+
+	--	prepare embeds, if they are available separately
+	local embeds = {root:GetEmbeds(addon)}	--	FIXME: addon?
+	for i, embedName in pairs(embeds) do
+		local embed = self:GetAddon(embedName)
+		
+		if embed then
+			if embed:CanLoD() then
+				--	don't load it now but make sure its dependencies are prepared
+				self:PrepareLoDTree(embedName)
+			else
+				--	FIXME: if it's already loaded
+				--	force-load it now so we can load the parent on demand
+				self:ForceLoadTree(depName)
+			end
+		end
+	end
+end
+
+
+function Core:PrepareReloadTree(addon)
+	root = self:GetAddon(root)
+	assert(root)
+	
+	root:Enable()
+	
+	--	check dependencies
+	local dependencies = {root:GetDependencies()}
+	for i, depName in pairs(dependencies) do
+		self:PrepareReloadTree(depName)
+	end
+
+	--	prepare embeds, if they are available separately
+	local embeds = {root:GetEmbeds(addon)}
+	for i, embedName in pairs(embeds) do
+		local embed = self:GetAddon(embedName)
+		
+		if embed then
+			self:PrepareReloadTree(embedName)
+		end
+	end
+end
+
+
+function Core:ForceLoadAvailable()
+	return true
+	--	FIXME: use field and a frame registered for PLAYER_LOGIN
+end

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/DependencyLoader_Core.toc	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,14 @@
+## Interface: 40000
+
+#  TODO: actually explain what DependencyLoader does.
+## Notes: Core module of DependencyLoader
+## Author: mckenziemc
+
+#  TODO: figure out some way to allow AddonLoader 
+#  to work with DependencyLoader
+## Dependencies: DependencyLoader, LibStub, LibPrint-1.0, Ace3
+
+## LoadOnDemand: 1
+
+
+start.xml

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/class.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,23 @@
+--	class.lua
+--	Implements a generic class builder.
+
+
+local addonName, addonTable = ...
+
+
+print( string.format([[running %s\class.lua]], addonName) )
+
+addonTable.classes = {}
+
+function addonTable:NewClass(name)
+	local class, prototype, metatable = {}, {}, {}
+	
+	class.prototype = prototype
+	
+	metatable.__index = prototype
+	class.instanceMetatable = metatable
+	
+	self.classes[name] = class
+	
+	return class, prototype
+end

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/frontend.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,83 @@
+--	main.lua
+--	
+
+local addonName, addonTable = ...
+
+
+local DependencyLoader = LibStub("AceAddon-3.0"):NewAddon(addonName)
+_G[addonName] = DependencyLoader
+
+local libPrint = LibStub("LibPrint-1.0")
+DependencyLoader.printStream = libPrint:NewStream("DependencyLoader", "DpLdr", print)
+DependencyLoader.debugStream = libPrint:NewStream("DependencyLoader", "DpLdr", "mcm")
+
+--	temp
+DependencyLoader.classes = addonTable.classes
+
+function DependencyLoader:Print(...)
+	self.printStream:Print(...)
+end
+
+
+function DependencyLoader:Debug(...)
+	self.debugStream:Print(...)
+end
+
+
+function DependencyLoader:OnInitialize()
+	self:Debug("Initializing and enabling", addonName)
+	self:Enable()
+end
+
+
+function DependencyLoader:OnEnable()
+	self.core = addonTable.classes.Core:New()
+	
+	self:Print("Enabled", addonName)
+	
+	self:FixCurrentAddons()
+end
+
+function DependencyLoader:OnDisable()
+	self:Print("Disabled", addonName)
+end
+
+
+--	TODO: move this into core?
+
+--	Enables any dependencies needed by the addons 
+--	that have already been enabled
+function DependencyLoader:FixCurrentAddons()
+	local core = self.core
+
+	for i=1, GetNumAddOns() do
+		local addon = self.core:GetAddon(i)
+		
+		if addon:IsEnabled() then
+			if addon:IsLoaded() then
+				--	TODO: it might still help to enable its embeds
+			else
+				self:Debug("Checking", addon:GetName())
+				
+				if addonTable.classes.Core:ForceLoadAvailable() then
+					if core:CanForceLoadTree(addon:GetName()) then
+						core:ForceLoadTree(addon:GetName())
+					else
+						print("Can't force load", addon:GetName())
+					end
+				else
+					if core:CanLoDTree(addon:GetName()) then
+						core:PrepareLoDTree(addon:GetName())
+					else
+						print("Couldn't load", addon:GetName(), "on demand.")
+					end
+				end
+			end
+		end
+	end
+end
+		
+		
+		
+		
+		
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/start.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,21 @@
+--	start.lua
+--	Initializes components of DependencyLoader
+
+
+local addonName, addonTable = ...
+
+
+print( string.format([[running %s\start.lua]], addonName) )
+
+--	NOTE: We don't have to check if this module's dependencies 
+--	are available: it lists them normally in its .toc file and 
+--	the bootstrap module will take care of enabling them first.
+
+--	prepare output functions
+local lp = LibStub("LibPrint-1.0")
+local printStream = lp:NewStream("DependencyLoader", "DepLoader", "DepLdr", print)
+local debugStream = lp:NewStream("DependencyLoader", "DepLoader", "DepLdr", "mcm")
+
+addonTable.print = function(...) printStream:Print(...) end
+addonTable.debug = function(...) debugStream:Print(...) end
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Core/start.xml	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,1 @@
+<ui xsi:schemaLocation="http://www.blizzard.com/wow/ui/ ..\FrameXML\UI.xsd">
  <script file="start.lua"/>
  <script file="class.lua"/>
  
  <script file="Addon.lua"/>
  <script file="Core.lua"/>
  
  <script file="frontend.lua"/>
</ui>
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Errata/DependencyLoader_Errata.toc	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,10 @@
+## Interface: 40000
+
+## Author: mckenziemc
+
+## Dependencies: DependencyLoader
+
+## LoadOnDemand: 1
+
+
+start.xml

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Errata/main.lua	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,1 @@
+print("running DependencyLoader_Errata\main.lua")

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DependencyLoader_Errata/start.xml	Tue Nov 30 16:13:04 2010 -0800
@@ -0,0 +1,3 @@
+<ui>
+	<script file="main.lua"/>
+</ui>