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-rw-r--r--XMonad.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/XMonad.hs b/XMonad.hs
index 24c7899..a628fd0 100644
--- a/XMonad.hs
+++ b/XMonad.hs
@@ -26,6 +26,7 @@ import Control.Monad.State
import System.IO
import System.Process (runCommand)
import Graphics.X11.Xlib
+import Control.Exception
-- | XState, the window manager state.
-- Just the display, width, height and a window list
@@ -72,7 +73,8 @@ io = liftIO
-- | spawn. Launch an external application
spawn :: String -> X ()
-spawn x = io (runCommand x) >> return ()
+spawn x = do v <- io $ handle (return . Just) (runCommand x >> return Nothing)
+ whenJust v $ \e -> trace $ "xmonad:spawn: unable to fork "++show x++": "++show e
-- | Run a side effecting action with the current workspace. Like 'when' but
whenJust :: Maybe a -> (a -> X ()) -> X ()