    -----------------------------------------------------------------------------
    -- |
    -- Module      :  XMonad.Prompt.Workspace
    -- Copyright   :  (C) 2007 Andrea Rossato, David Roundy
    -- License     :  BSD3
    --
    -- Maintainer  :  droundy@darcs.net
    -- Stability   :  unstable
    -- Portability :  unportable
    --
    -- A workspace prompt for XMonad
    --
    -----------------------------------------------------------------------------

    module XMonad.Prompt.Workspace (
                                 -- * Usage
                                 -- $usage
                                 workspacePrompt
                                  ) where

    import XMonad hiding ( workspaces )
    import XMonad.Prompt
    import XMonad.StackSet ( workspaces, tag )
    import XMonad.Util.WorkspaceCompare ( getSortByIndex )

    -- $usage
    -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
    --
    -- > import XMonad.Prompt
    -- > import XMonad.Prompt.Workspace
    --
    -- >   , ((modMask x .|. shiftMask, xK_m     ), workspacePrompt defaultXPConfig (windows . W.shift))
    --
    -- For detailed instruction on editing the key binding see
    -- "XMonad.Doc.Extending#Editing_key_bindings".

    data Wor = Wor String

    instance XPrompt Wor where
        showXPrompt (Wor x) = x

    workspacePrompt :: XPConfig -> (String -> X ()) -> X ()
    workspacePrompt c job = do ws <- gets (workspaces . windowset)
                               sort <- getSortByIndex
                               let ts = map tag $ sort ws
                               mkXPrompt (Wor "") c (mkCompl ts) job

    mkCompl :: [String] -> String -> IO [String]
    mkCompl l s = return $ filter (\x -> take (length s) x == s) l