[syslog-ng]macro expansion in program destinations

[Nate Campi]

I might be missing something obvious here, but is there a way to get
macros to expand when used as arguments to external scripts?

ex:
----------------
destination test-script {
        program("/tmp/testscript /var/log/HOSTS/$HOST/$YEAR/$MONTH/$DAY/$FACILITY_$HOST_$YEAR_$MONTH_$DAY");
};

log {   
        source(src);
        destination(test-script);
};
----------------

Here's /tmp/testscript:
----------------
#!/bin/sh
echo $1 > /tmp/arg
----------------

# cat /tmp/arg
/var/log/HOSTS/////

I'd like to be able to pass these things, especially message-specific
things like facility. Is there a way and I'm just not seeing it?
-- 
Nate Campi    http://www.campin.net