    -----------------------------------------------------------------------------
    -- |
    -- Module      :  XMonad.Actions.DwmPromote
    -- Copyright   :  (c) Miikka Koskinen 2007
    -- License     :  BSD3-style (see LICENSE)
    --
    -- Maintainer  :  arcatan@kapsi.fi
    -- Stability   :  stable
    -- Portability :  unportable
    --
    -- Dwm-like swap function for xmonad.
    --
    -- Swaps focused window with the master window. If focus is in the
    -- master, swap it with the next window in the stack. Focus stays in the
    -- master.
    --
    -----------------------------------------------------------------------------

    module XMonad.Actions.DwmPromote (
                                     -- * Usage
                                     -- $usage
                                     dwmpromote
                                    ) where

    import XMonad
    import XMonad.StackSet

    -- $usage
    --
    -- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:
    --
    -- >    import XMonad.Actions.DwmPromote
    --
    -- then add a keybinding or substitute 'dwmpromote' in place of promote:
    --
    -- >   , ((modm,               xK_Return), dwmpromote)
    --
    -- For detailed instructions on editing your key bindings, see
    -- "XMonad.Doc.Extending#Editing_key_bindings".

    -- | Swap the focused window with the master window. If focus is in
    --   the master, swap it with the next window in the stack. Focus
    --   stays in the master.
    dwmpromote :: X ()
    dwmpromote = windows $ modify' $
                 \c -> case c of
                       Stack _ [] []     -> c
                       Stack t [] (x:rs) -> Stack x [] (t:rs)
                       Stack t ls rs     -> Stack t [] (ys ++ x : rs) where (x:ys) = reverse ls