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commit f3e0219cc6
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+-- LibStub is a simple versioning stub meant for use in Libraries.  http://www.wowace.com/wiki/LibStub for more info
+-- LibStub is hereby placed in the Public Domain Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
+local LIBSTUB_MAJOR, LIBSTUB_MINOR = "LibStub", 2 -- NEVER MAKE THIS AN SVN REVISION! IT NEEDS TO BE USABLE IN ALL REPOS!
+local _G = getfenv()
+local strfind, strfmt = string.find, string.format
+local LibStub = _G[ LIBSTUB_MAJOR ]
+
+if not LibStub or LibStub.minor < LIBSTUB_MINOR then
+  LibStub = LibStub or { libs = {}, minors = {} }
+  _G[ LIBSTUB_MAJOR ] = LibStub
+  LibStub.minor = LIBSTUB_MINOR
+
+  function LibStub:NewLibrary( major, minor )
+    assert( type( major ) == "string", "Bad argument #2 to `NewLibrary' (string expected)" )
+    local _, _, num = strfind( minor, "(%d+)" )
+    minor = assert( tonumber( num ), "Minor version must either be a number or contain a number." )
+
+    local oldminor = self.minors[ major ]
+    if oldminor and oldminor >= minor then return nil end
+    self.minors[ major ], self.libs[ major ] = minor, self.libs[ major ] or {}
+    return self.libs[ major ], oldminor
+  end
+
+  function LibStub:GetLibrary( major, silent )
+    if not self.libs[ major ] and not silent then
+      error( strfmt( "Cannot find a library instance of %q.", tostring( major ) ), 2 )
+    end
+    return self.libs[ major ], self.minors[ major ]
+  end
+
+  function LibStub:IterateLibraries() return pairs( self.libs ) end
+
+  setmetatable( LibStub, { __call = LibStub.GetLibrary } )
+end