1 files changed, 91 insertions, 0 deletions
diff --git a/src/Xmobar/Plugins/XMonadLog.hs b/src/Xmobar/Plugins/XMonadLog.hs
new file mode 100644
index 0000000..a4f17bb
--- /dev/null
+++ b/src/Xmobar/Plugins/XMonadLog.hs
@@ -0,0 +1,91 @@
+{-# 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 Xmobar.Plugins.XMonadLog (XMonadLog(..)) where
+
+import Control.Monad
+import Graphics.X11
+import Graphics.X11.Xlib.Extras
+import Xmobar.Run.Commands
+#ifdef UTF8
+#undef UTF8
+import Codec.Binary.UTF8.String as UTF8
+#define UTF8
+#endif
+import Foreign.C (CChar)
+import Xmobar.Utils (nextEvent')
+import Xmobar.Actions (stripActions)
+
+data XMonadLog = XMonadLog
+               | UnsafeXMonadLog
+               | XPropertyLog String
+               | UnsafeXPropertyLog String
+               | NamedXPropertyLog String String
+               | UnsafeNamedXPropertyLog String String
+    deriving (Read, Show)
+
+instance Exec XMonadLog where
+    alias XMonadLog = "XMonadLog"
+    alias UnsafeXMonadLog = "UnsafeXMonadLog"
+    alias (XPropertyLog atom) = atom
+    alias (NamedXPropertyLog _ name) = name
+    alias (UnsafeXPropertyLog atom) = atom
+    alias (UnsafeNamedXPropertyLog _ name) = name
+
+    start x cb = do
+        let atom = case x of
+                XMonadLog -> "_XMONAD_LOG"
+                UnsafeXMonadLog -> "_XMONAD_LOG"
+                XPropertyLog a -> a
+                UnsafeXPropertyLog a -> a
+                NamedXPropertyLog a _ -> a
+                UnsafeNamedXPropertyLog a _ -> a
+            sanitize = case x of
+                UnsafeXMonadLog -> id
+                UnsafeXPropertyLog _ -> id
+                UnsafeNamedXPropertyLog _ _ -> id
+                _ -> stripActions
+
+        d <- openDisplay ""
+        xlog <- internAtom d atom False
+
+        root  <- rootWindow d (defaultScreen d)
+        selectInput d root propertyChangeMask
+
+        let update = do
+                        mwp <- getWindowProperty8 d xlog root
+                        maybe (return ()) (cb . sanitize . 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