add safeIO which catches and logs exceptions.

darcs-hash:20070611153650-72aca-c802f2ac167c0e9232d17a2897163aca5a5479f0

1 files changed, 4 insertions, 1 deletions

diff --git a/XMonad.hs b/XMonad.hs
index e08956d..4309fe1 100644
--- a/XMonad.hs
+++ b/XMonad.hs
@@ -17,7 +17,7 @@
 module XMonad (
     X, WindowSet, WorkspaceId(..), ScreenId(..), XState(..), XConf(..), Layout(..),
     Typeable, Message, SomeMessage(..), fromMessage,
-    runX, io, withDisplay, withWindowSet, isRoot, spawn, restart, trace, whenJust, whenX,
+    runX, io, safeIO, withDisplay, withWindowSet, isRoot, spawn, restart, trace, whenJust, whenX,
     atom_WM_STATE, atom_WM_PROTOCOLS, atom_WM_DELETE_WINDOW
   ) where
 
@@ -137,6 +137,9 @@ fromMessage (SomeMessage m) = cast m
 io :: IO a -> X a
 io = liftIO
 
+safeIO :: IO () -> X ()
+safeIO f = liftIO (f `catch` \e -> do hPutStrLn stderr (show e); hFlush stderr)
+
 -- | spawn. Launch an external application
 spawn :: String -> X ()
 spawn x = io $ do