[xmonad] X () with side effects

[Jochen Keil]

Hello,

I am trying to write a function which has side-effects, e.g. call spawn.

foo :: X ()
foo = do
  io $ spawn "myprogram"
  doSomethingElseOrReturn
  foo -- recursion

However, if I call foo from a keybinding

((modMask, xK_x), foo)

the spawned program will run but not mapped. This means that I can see
the console output in xmonad stdout/stderr but the window will not pop
up. I think this is because of the internal handling of keyevents in
xmonads main. Is there a way I could bypass this and have my windows
mapped as soon as I call the program with spawn?

I hope this is clear enough.. if not, I'll come back with the actual
code I have written. It's some kind of of vi-mode behaviour for xmonad.
Pure X actions (like focusing up/down) work without problems but
spawning doesn't.

Many thanks and best regards,

Jochen

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