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+{-# LANGUAGE CPP #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module : Plugins.StdinReader
+-- Copyright : (c) Spencer Janssen
+-- License : BSD-style (see LICENSE)
+--
+-- Maintainer : Spencer Janssen <spencerjanssen@gmail.com>
+-- Stability : unstable
+-- Portability : unportable
+--
+-- A plugin to display information from _XMONAD_LOG, specified at
+-- http://code.haskell.org/XMonadContrib/XMonad/Hooks/DynamicLog.hs
+--
+-----------------------------------------------------------------------------
+
+module Plugins.XMonadLog (XMonadLog(..)) where
+
+import Control.Monad
+import Graphics.X11
+import Graphics.X11.Xlib.Extras
+import Plugins
+#ifdef UTF8
+#undef UTF8
+import Codec.Binary.UTF8.String as UTF8
+#define UTF8
+#endif
+import Foreign.C (CChar)
+import XUtil (nextEvent')
+
+
+data XMonadLog = XMonadLog
+ deriving (Read, Show)
+
+instance Exec XMonadLog where
+ start XMonadLog cb = do
+ d <- openDisplay ""
+ xlog <- internAtom d "_XMONAD_LOG" False
+
+ root <- rootWindow d (defaultScreen d)
+ selectInput d root propertyChangeMask
+
+ let update = do
+ mwp <- getWindowProperty8 d xlog root
+ maybe (return ()) (cb . decodeCChar) mwp
+
+ update
+
+ allocaXEvent $ \ep -> forever $ do
+ nextEvent' d ep
+ e <- getEvent ep
+ case e of
+ PropertyEvent { ev_atom = a } | a == xlog -> update
+ _ -> return ()
+
+ return ()
+
+decodeCChar :: [CChar] -> String
+#ifdef UTF8
+#undef UTF8
+decodeCChar = UTF8.decode . map fromIntegral
+#define UTF8
+#else
+decodeCChar = map (toEnum . fromIntegral)
+#endif