[xmonad] Shutdown hook

[Juraj Hercek]

On 02/14/2010 12:55 AM, Don Stewart wrote:
> juhe_xmonad:
>    
>> Hello,
>>
>> There is a startupHook in XConfig. I'm missing shutdownHook however. Is
>> there any proper way to execute custom code when xmonad is about to exit?
>>
>>      
> xmonad exits by throwing an asynchronous exception from the inner loop
> out to main. The runtime catches this an exits gracefully.
>
> You can write your own shutdown hook by catching this exception in your
> config main, and running your hook, before rethrowing.
>
> I bet someone's already done this, and wrapped it up nicely, otherwise,
> look at Control.Exception in the Haskell base library for how to use the
> catch/handle functions.
>
> Pseudocode:
>
>      import Control.Exception
>      import XMonad
>
>      main = handle xmonad shutdown
>         where
>          shutdown e = do
>              ... my action ...
>              throw e
>    

Thanks for quick response!

-- Juraj