Hierarchify

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+{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Layout.Square
+-- Copyright   :  (c) David Roundy <droundy@darcs.net>
+-- License     :  BSD3-style (see LICENSE)
+-- 
+-- Maintainer  :  David Roundy <droundy@darcs.net>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A layout that splits the screen into a square area and the rest of the
+-- screen.
+-- This is probably only ever useful in combination with 
+-- "XMonad.Layout.Combo".
+-- It sticks one window in a square region, and makes the rest
+-- of the windows live with what's left (in a full-screen sense).
+--
+-----------------------------------------------------------------------------
+
+module XMonad.Layout.Square (
+                             -- * Usage
+                             -- $usage
+                             Square(..) ) where
+
+import XMonad
+import Graphics.X11.Xlib
+import XMonad.StackSet ( integrate )
+
+-- $usage
+-- You can use this module with the following in your Config.hs file:
+--
+-- >   import XMonad.Layout.Square
+--
+-- An example layout using square together with "XMonad.Layout.Combo"
+-- to make the very last area square:
+--
+-- > , combo (combo (mirror $ twoPane 0.03 0.85),1)] (twoPane 0.03 0.5) )
+-- >                [(twoPane 0.03 0.2,1),(combo [(twoPane 0.03 0.8,1),(square,1)]
+-- >         [(tabbed,3),(tabbed,30),(tabbed,1),(tabbed,1)]
+
+-- %import XMonad.Layout.Square
+
+data Square a = Square deriving ( Read, Show )
+
+instance LayoutClass Square a where
+    pureLayout Square r s = arrange (integrate s)
+        where arrange ws@(_:_) = map (\w->(w,rest)) (init ws) ++ [(last ws,sq)]
+              arrange [] = [] -- actually, this is an impossible case
+              (rest, sq) = splitSquare r
+
+splitSquare :: Rectangle -> (Rectangle, Rectangle)
+splitSquare (Rectangle x y w h)
+    | w > h = (Rectangle x y (w - h) h, Rectangle (x+fromIntegral (w-h)) y h h)
+    | otherwise = (Rectangle x y w (h-w), Rectangle x (y+fromIntegral (h-w)) w w)