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+{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Layout.TwoPane
+-- Copyright   :  (c) Spencer Janssen <sjanssen@cse.unl.edu>
+-- License     :  BSD3-style (see LICENSE)
+-- 
+-- Maintainer  :  Spencer Janssen <sjanssen@cse.unl.edu>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A layout that splits the screen horizontally and shows two windows.  The
+-- left window is always the master window, and the right is either the
+-- currently focused window or the second window in layout order.
+--
+-----------------------------------------------------------------------------
+
+module XMonad.Layout.TwoPane (
+                              -- * Usage
+                              -- $usage
+                              TwoPane (..)
+                             ) where
+
+import XMonad
+import XMonad.Layouts ( Resize(..), splitHorizontallyBy )
+import XMonad.StackSet ( focus, up, down)
+
+-- $usage
+--
+-- You can use this module with the following in your Config.hs file:
+--
+-- > import XMonad.Layout.TwoPane
+--
+--  and add, to the list of layouts:
+--
+-- > , (Layout $ TwoPane 0.03 0.5)
+
+-- %import XMonad.Layout.TwoPane
+-- %layout , (Layout $ TwoPane 0.03 0.5)
+
+data TwoPane a = 
+    TwoPane Rational Rational 
+    deriving ( Show, Read )
+
+instance LayoutClass TwoPane a where
+    doLayout (TwoPane _ split) r s = return (arrange r s,Nothing)
+        where
+          arrange rect st = case reverse (up st) of
+                              (master:_) -> [(master,left),(focus st,right)]
+                              [] -> case down st of
+                                      (next:_) -> [(focus st,left),(next,right)]
+                                      [] -> [(focus st, rect)]
+              where (left, right) = splitHorizontallyBy split rect
+
+    handleMessage (TwoPane delta split) x = 
+        return $ case fromMessage x of
+                   Just Shrink -> Just (TwoPane delta (split - delta))
+                   Just Expand -> Just (TwoPane delta (split + delta))
+                   _           -> Nothing
+