From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [RFC] Re: Convert 'git blame' to parse_options()
Date: Mon, 23 Jun 2008 14:23:58 -0700
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Jeff King <peff@peff.net>,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	Git Mailing List <git@vger.kernel.org>
To: Pierre Habouzit <madcoder@debian.org>
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In-Reply-To: <20080623210935.GC13395@artemis.madism.org> (Pierre Habouzit's
 message of "Mon, 23 Jun 2008 23:09:35 +0200")
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Pierre Habouzit <madcoder@debian.org> writes:

>   With that, you write parsers this way:
>
> {
>     struct parse_opt_ctx_t ctx;
>
>     parse_options_start(&ctx, argc, argv, 0);
>
>     for (;;) {
>         const char *arg;
>
>         switch (parse_options_step(&ctx, options, usagestr)) {
>         case PARSE_OPT_HELP:
>             /* dump your help here, the one for options/usagestr is already dumped */
>             exit(129);
>         case PARSE_OPT_DONE:
>             goto done;
>         }
>
>         arg = *ctx->argv++;
>         ctx->argc--;
>
>         if (strcmp(arg, "-")) {
>             /* you're on baby ! */
>         } else if ....
>         } else {
>             error("unknown option %s", arg);
>             parse_options_usage(options, usagestr);
>             /* dump your help here */
>             exit(129);
>         }
>     }
>
> done:
>     argc = parse_options_end(&ctx);
> }

Nice.  I have started doing the same (insignificant details are different;
e.g. I used "positive is unknown" convention instead ) and then the
solution is sitting in my mbox ;-)