From: Shawn Bohrer <shawn.bohrer@gmail.com>
Date: Thu, 19 Jun 2008 14:25:27 GMT
Subject: Re: [PATCH 1/2] parse_options: Add flag to prevent errors for further processing
Message-ID: <20080619142527.GA8429@mediacenter>
In-Reply-To: <7v8wx2zibp.fsf@gitster.siamese.dyndns.org>

On Wed, Jun 18, 2008 at 11:52:42AM -0700, Junio C Hamano wrote:
> Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:
> 
> > On Tue, 17 Jun 2008, Junio C Hamano wrote:
> >
> >> Jeff King <peff@peff.net> writes:
> >> 
> >> > I think the only right way to accomplish this is to convert the revision
> >> > and diff parameters into a parseopt-understandable format.
> >> 
> >> Not necessarily.  You could structure individual option parsers like how 
> >> diff option parsers are done.  You iterate over argv[], feed diff option 
> >> parser the current index into argv[] and ask if it is an option diff 
> >> understands, have diff eat the option (and possibly its parameter) to 
> >> advance the index, or allow diff option to say "I do not understand 
> >> this", and then handle it yourself or hand it to other parsers.
> >
> > AFAIR Pierre tried a few ways, and settled with a macro to introduce the 
> > diff options into a caller's options.
> >
> > IOW it would look something like this:
> >
> > static struct option builtin_what_options[] = {
> > 	[... options specific to this command ...]
> > 	DIFF__OPT(&diff_options)
> > };
> 
> I think that is the more painful approach Jeff mentioned, and my comment
> was to show that it is not the only way.
> 

It seems to me that you could implement Jeff's
PARSE_OPT_STOP_AT_UNKNOWN, and then if multiple option parsers are
needed you would simply loop over parse_options for each of the
commands, waiting for argc to stop changing.  Of course Jeff's flag
would also need to stop parse_options from eating the first argument.
Is this sort of what you are suggesting Junio?

--
Shawn