ShellPrompt: a graphical shell prompt

This module requires readline and so a modification to xmonad.cabal. See
usage for instructions.

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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonadContrib.ShellPrompt
+-- Copyright   :  (C) 2007 Andrea Rossato
+-- License     :  BSD3
+-- 
+-- Maintainer  :  andrea.rossato@unibz.it
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A shell prompt for XMonad
+--
+-----------------------------------------------------------------------------
+
+module XMonadContrib.ShellPrompt (
+                             -- * Usage
+                             -- $usage
+                             shellPrompt
+                              ) where
+{-
+usage:
+1. In xmonad.cabal change: 
+build-depends:      base>=2.0, X11>=1.2.1, X11-extras>=0.2, mtl>=1.0, unix>=1.0
+to
+build-depends:      base>=2.0, X11>=1.2.1, X11-extras>=0.2, mtl>=1.0, unix>=1.0, readline >= 1.0
+
+2. In Config.hs add:
+> import XMonadContrib.ShellPrompt
+
+3. In your keybindings add something like:
+
+>   , ((modMask .|. controlMask, xK_x), shellPrompt defaultPromptConfig)
+
+-}
+
+import XMonad
+import XMonadContrib.XPrompt
+
+import Control.Monad
+import Data.List
+import System.Console.Readline
+import System.Environment
+
+data Shell = Shell
+
+instance XPrompt Shell where
+    showXPrompt Shell = "Run:   "
+
+
+shellPrompt :: XPConfig -> X ()
+shellPrompt c = mkXPrompt Shell c getShellCompl spawn
+
+getShellCompl :: String -> IO [String]
+getShellCompl s 
+    | s /= "" && last s /= ' ' = do
+  fl <- filenameCompletionFunction (last . words $ s)
+  c <- commandCompletionFunction (last . words $ s)
+  return $ sort . nub $ fl ++ c
+    | otherwise = return []
+
+commandCompletionFunction :: String -> IO [String]
+commandCompletionFunction str 
+    | '/' `elem` str = return []
+    | otherwise = do
+  p <- getEnv "PATH"
+  cl p
+    where
+      cl = liftM (nub . rmPath . concat) . mapM fCF . map addToPath . split ':'  
+      addToPath = flip (++) ("/" ++ str)
+      fCF = filenameCompletionFunction
+      rmPath [] = []
+      rmPath s = map (last . split '/') s
+
+split :: Eq a => a -> [a] -> [[a]]
+split _ [] = []
+split e l =
+    f : split e (rest ls)
+        where 
+          (f,ls) = span (/=e) l
+          rest s | s == [] = []
+                 | otherwise = tail s
+