content: -----------------------------------------------------------------------------
  -- |
  -- 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
  