Split some code which is commonly used by GUI code off into its own file.

diff --git a/AckisRecipeList.toc b/AckisRecipeList.toc
index f0376d6..db26e86 100644
--- a/AckisRecipeList.toc
+++ b/AckisRecipeList.toc
@@ -72,6 +72,7 @@ Scanner.lua
 Player.lua

 # User Interface files
+interface.xml
 Frame.lua

 # Database files
diff --git a/Frame.lua b/Frame.lua
index 9a29394..9691a92 100644
--- a/Frame.lua
+++ b/Frame.lua
@@ -141,38 +141,16 @@ StaticPopupDialogs["ARL_SEARCHFILTERED"] = {
 }

 -------------------------------------------------------------------------------
--- Variables
--------------------------------------------------------------------------------
-local FilterValueMap		-- Assigned in InitializeFrame()
-
--------------------------------------------------------------------------------
 -- Upvalues
 -------------------------------------------------------------------------------
 local SetTextColor = private.SetTextColor
+local AcquireTable = private.AcquireTable
+local ReleaseTable = private.ReleaseTable

 local ListFrame
 local MainPanel

--------------------------------------------------------------------------------
--- Table cache mechanism
--------------------------------------------------------------------------------
-local AcquireTable, ReleaseTable
-do
-	local table_cache = {}
-
-	-- Returns a table
-	function AcquireTable()
-		local tbl = table.remove(table_cache) or {}
-		return tbl
-	end
-
-	-- Cleans the table and stores it in the cache
-	function ReleaseTable(tbl)
-		if not tbl then return end
-		table.wipe(tbl)
-		table.insert(table_cache, tbl)
-	end
-end	-- do block
+local FilterValueMap		-- Assigned in InitializeFrame()

 -------------------------------------------------------------------------------
 -- Close all possible pop-up windows
@@ -329,67 +307,6 @@ do
 end	-- do

 -------------------------------------------------------------------------------
--- Sort functions
--------------------------------------------------------------------------------
-local SortRecipeList
-do
-	addon.sorted_recipes = {}
-
-	local recipe_list = private.recipe_list
-	local sorted_recipes = addon.sorted_recipes
-
-	local function Sort_SkillAsc(a, b)
-		local reca, recb = recipe_list[a], recipe_list[b]
-
-		if reca.skill_level == recb.skill_level then
-			return reca.name < recb.name
-		else
-			return reca.skill_level < recb.skill_level
-		end
-	end
-
-	local function Sort_SkillDesc(a, b)
-		local reca, recb = recipe_list[a], recipe_list[b]
-
-		if reca.skill_level == recb.skill_level then
-			return reca.name < recb.name
-		else
-			return recb.skill_level < reca.skill_level
-		end
-	end
-
-	local function Sort_NameAsc(a, b)
-		return recipe_list[a].name < recipe_list[b].name
-	end
-
-	local function Sort_NameDesc(a, b)
-		return recipe_list[a].name > recipe_list[b].name
-	end
-
-	local RECIPE_SORT_FUNCS = {
-		["SkillAscending"]	= Sort_SkillAsc,
-		["SkillDescending"]	= Sort_SkillDesc,
-		["NameAscending"]	= Sort_NameAsc,
-		["NameDescending"]	= Sort_NameDesc,
-	}
-
-	-- Sorts the recipe_list according to configuration settings.
-	function SortRecipeList(recipe_list)
-		local sort_type = addon.db.profile.sorting
-		local skill_view = addon.db.profile.skill_view
-
-		local sort_func = RECIPE_SORT_FUNCS[(skill_view and "Skill" or "Name")..sort_type] or Sort_NameAsc
-
-		table.wipe(sorted_recipes)
-
-		for n, v in pairs(recipe_list) do
-			table.insert(sorted_recipes, n)
-		end
-		table.sort(sorted_recipes, sort_func)
-	end
-end	-- do
-
--------------------------------------------------------------------------------
 -- Tooltip functions and data.
 -------------------------------------------------------------------------------
 local spell_tip = CreateFrame("GameTooltip", "arlSpellTooltip", UIParent, "GameTooltipTemplate")
@@ -2653,7 +2570,7 @@ do
 				local recipe_list = private.acquire_list[acquire_id].recipes
 				local sorted_recipes = addon.sorted_recipes

-				SortRecipeList(recipe_list)
+				private.SortRecipeList(recipe_list)

 				for index = 1, #sorted_recipes do
 					local spell_id = sorted_recipes[index]
@@ -2695,7 +2612,7 @@ do
 				local recipe_list = private.location_list[location_id].recipes
 				local sorted_recipes = addon.sorted_recipes

-				SortRecipeList(recipe_list)
+				private.SortRecipeList(recipe_list)

 				for index = 1, #sorted_recipes do
 					local spell_id = sorted_recipes[index]
diff --git a/Interface/Common.lua b/Interface/Common.lua
new file mode 100644
index 0000000..202d2e4
--- /dev/null
+++ b/Interface/Common.lua
@@ -0,0 +1,99 @@
+-------------------------------------------------------------------------------
+-- Localized Lua globals.
+-------------------------------------------------------------------------------
+local _G = getfenv(0)
+
+local table = _G.table
+local string = _G.string
+
+-------------------------------------------------------------------------------
+-- AddOn namespace.
+-------------------------------------------------------------------------------
+local LibStub = LibStub
+
+local MODNAME	= "Ackis Recipe List"
+local addon	= LibStub("AceAddon-3.0"):GetAddon(MODNAME)
+
+-- Set up the private intra-file namespace.
+local private	= select(2, ...)
+
+-------------------------------------------------------------------------------
+-- Table cache mechanism
+-------------------------------------------------------------------------------
+do
+	local table_cache = {}
+
+	-- Returns a table
+	function private.AcquireTable()
+		local tbl = table.remove(table_cache) or {}
+		return tbl
+	end
+
+	-- Cleans the table and stores it in the cache
+	function private.ReleaseTable(tbl)
+		if not tbl then return end
+		table.wipe(tbl)
+		table.insert(table_cache, tbl)
+	end
+end	-- do block
+
+-------------------------------------------------------------------------------
+-- Sort functions
+-------------------------------------------------------------------------------
+do
+	addon.sorted_recipes = {}
+
+	local recipe_list = private.recipe_list
+	local sorted_recipes = addon.sorted_recipes
+
+	local function Sort_SkillAsc(a, b)
+		local reca, recb = recipe_list[a], recipe_list[b]
+
+		if reca.skill_level == recb.skill_level then
+			return reca.name < recb.name
+		else
+			return reca.skill_level < recb.skill_level
+		end
+	end
+
+	local function Sort_SkillDesc(a, b)
+		local reca, recb = recipe_list[a], recipe_list[b]
+
+		if reca.skill_level == recb.skill_level then
+			return reca.name < recb.name
+		else
+			return recb.skill_level < reca.skill_level
+		end
+	end
+
+	local function Sort_NameAsc(a, b)
+		return recipe_list[a].name < recipe_list[b].name
+	end
+
+	local function Sort_NameDesc(a, b)
+		return recipe_list[a].name > recipe_list[b].name
+	end
+
+	local RECIPE_SORT_FUNCS = {
+		["SkillAscending"]	= Sort_SkillAsc,
+		["SkillDescending"]	= Sort_SkillDesc,
+		["NameAscending"]	= Sort_NameAsc,
+		["NameDescending"]	= Sort_NameDesc,
+	}
+
+	-- Sorts the recipe_list according to configuration settings.
+	function private.SortRecipeList(recipe_list)
+		local sort_type = addon.db.profile.sorting
+		local skill_view = addon.db.profile.skill_view
+
+		local sort_func = RECIPE_SORT_FUNCS[(skill_view and "Skill" or "Name")..sort_type] or Sort_NameAsc
+
+		table.wipe(sorted_recipes)
+
+		for n, v in pairs(recipe_list) do
+			table.insert(sorted_recipes, n)
+		end
+		table.sort(sorted_recipes, sort_func)
+	end
+end	-- do
+