[xmonad] how to redirect dynamicLogXinerama output to a FIFO/named pipe?

[Lara Michaels]

I would like to be able to have xmonad write the output of its dynamicLogXinerama to a FIFO (that I can then read from a Unity app indicator and thus display the workspaces being currently used). 


I modified my desktop config so that rather than executing xmonad directly it instead runs a simple wrapper script
#!/bin/sh

mkfifo /tmp/xmonad-fifo
xmonad >/tmp/xmonad-fifo

but to my surprise running 'tail -f /tmp/xmonad-fifo' shows no 
output, while if I simply start xmonad in a terminal I can see it 
printing information about the workspaces being used to the terminal:
[1]
[1]
[2]1
[2]1
...

It would be awesome if anyone could tell me why xmonad's dynamicLog output is not showing up  in the FIFO. xmonad 
itself is clearly running (from the moment I start reading data from the FIFO.)

thanks! 

~l
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