completion pb: non mandatory parameter for option

completion pb: non mandatory parameter for option

[arno.]

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Hi,
I'm trying to get an updated completion for debian command debchange.

It has on option : --news, and that option can take a file as a 
parameter, but that is not mandatory.

Handling of that case is (in perl) :
$opt_news = 'debian/NEWS' if defined $opt_news and $opt_news eq '';

I'd like to have something similar to _alternative: completion for 
--news parameter, and also for other parameters of debchange.

If I use _alternative 'news file::_files' 'normal::_normal', I go in a
infinite recursive function call
If I just use _alternative 'news files::_files', I *must* enter a file 
name before I return to normal completion

Is there a way to do that ?

thanks
arno

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