XMonad

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------------------------------------------------------------------------------
--- |
--- Module      :  WMonad.hs
--- Copyright   :  (c) Spencer Janssen 2007
--- License     :  BSD3-style (see LICENSE)
--- 
--- Maintainer  :  sjanssen@cse.unl.edu
--- Stability   :  unstable
--- Portability :  not portable, uses cunning newtype deriving
---
------------------------------------------------------------------------------
---
--- The W monad, a state monad transformer over IO, for the window
--- manager state, and support routines.
---
-
-module WMonad (
-    W, WorkSpace, WState(..),runW, withDisplay, io, spawn, trace, whenJust
-  ) where
-
-import StackSet (StackSet)
-
-import Control.Monad.State
-import System.IO
-import System.Process (runCommand)
-import Graphics.X11.Xlib (Display,Window)
-
--- | WState, the window manager state.
--- Just the display, width, height and a window list
-data WState = WState
-    { display       :: Display
-    , screenWidth   :: {-# UNPACK #-} !Int
-    , screenHeight  :: {-# UNPACK #-} !Int
-    , workspace     :: {-# UNPACK #-} !WorkSpace      -- ^ workspace list
-    }
-
-type WorkSpace = StackSet Window
-
--- | The W monad, a StateT transformer over IO encapuslating the window
--- manager state
-newtype W a = W (StateT WState IO a)
-    deriving (Functor, Monad, MonadIO, MonadState WState)
-
--- | Run the W monad, given a chunk of W monad code, and an initial state
--- Return the result, and final state
-runW :: WState -> W a -> IO ()
-runW st (W a) = runStateT a st >> return ()
-
--- | Run a monad action with the current display settings
-withDisplay :: (Display -> W ()) -> W ()
-withDisplay f = gets display >>= f
-
-------------------------------------------------------------------------
-
--- | Lift an IO action into the W monad
-io :: IO a -> W a
-io = liftIO
-{-# INLINE io #-}
-
--- | spawn. Launch an external application
-spawn :: String -> W ()
-spawn x = io (runCommand x) >> return ()
-
--- | Run a side effecting action with the current workspace. Like 'when' but
-whenJust :: Maybe a -> (a -> W ()) -> W ()
-whenJust mg f = maybe (return ()) f mg
-
--- | A 'trace' for the W monad. Logs a string to stderr. The result may
--- be found in your .xsession-errors file
-trace :: String -> W ()
-trace msg = io $! do hPutStrLn stderr msg; hFlush stderr