use XPrompt in WorkspaceDir.

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diff --git a/DirectoryPrompt.hs b/DirectoryPrompt.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonadContrib.DirectoryPrompt
+-- Copyright   :  (C) 2007 Andrea Rossato, David Roundy
+-- License     :  BSD3
+-- 
+-- Maintainer  :  droundy@darcs.net
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A directory prompt for XMonad
+--
+-----------------------------------------------------------------------------
+
+module XMonadContrib.DirectoryPrompt (
+                             -- * Usage
+                             -- $usage
+                             directoryPrompt
+                              ) where
+
+import XMonad
+import XMonadContrib.XPrompt
+import XMonadContrib.Dmenu ( runProcessWithInput )
+
+-- $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.XPrompt
+-- > import XMonadContrib.ShellPrompt
+--
+-- 3. In your keybindings add something like:
+--
+-- >   , ((modMask .|. controlMask, xK_x), shellPrompt defaultXPConfig)
+--
+
+data Dir = Dir String
+
+instance XPrompt Dir where
+    showXPrompt (Dir x) = x
+
+directoryPrompt :: XPConfig -> String -> (String -> X ()) -> X ()
+directoryPrompt c prom job = mkXPrompt (Dir prom) c getDirCompl job
+
+getDirCompl :: String -> IO [String]
+getDirCompl s = (filter notboring . lines) `fmap`
+                runProcessWithInput "/bin/bash" [] ("compgen -A directory " ++ s ++ "\n")
+
+notboring ('.':'.':_) = True
+notboring ('.':_) = False
+notboring _ = True