CycleWS: a couple of simple functions to cycle between workspaces

CycleWS.hs

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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonadContrib.CycleWS
+-- Copyright   :  (C) 2007 Andrea Rossato
+-- License     :  BSD3
+-- 
+-- Maintainer  :  andrea.rossato@unibz.it
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A module to cycle between Workspaces
+--
+-----------------------------------------------------------------------------
+
+module XMonadContrib.CycleWS (
+                             -- * Usage
+                             -- $usage
+                             nextWS
+                             , prevWS
+                              ) where
+
+import XMonad
+import Operations
+import qualified StackSet as W
+import {-# SOURCE #-} Config (workspaces)
+import Data.List
+
+-- $usage
+-- Import this module in Config.hs:
+--
+-- > import XMonadContrib.CycleWS
+--
+-- And add, in you key bindings:
+--
+-- >     , ((modMask              , xK_comma ), prevWS ) 
+-- >     , ((modMask              , xK_period), nextWS ) 
+
+nextWS, prevWS :: X ()
+nextWS = withWindowSet $ \s -> view (workspaces !! (setWS s N))
+prevWS = withWindowSet $ \s -> view (workspaces !! (setWS s P))
+
+data Dir = P | N deriving Eq
+setWS :: WindowSet -> Dir -> Int
+setWS s d 
+    | d == N && cur == (lw - 1) = 0
+    | d == N                    = cur + 1
+    | d == P && cur == 0        = lw - 1
+    | otherwise                 = cur - 1
+      where 
+        cur = maybe 0 id $ elemIndex (W.tag (W.workspace ((W.current s)))) workspaces
+        lw  = length workspaces