From: Nicolas Vigier <boklm@mars-attacks.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, Pierre Habouzit <madcoder@debian.org>
Subject: Re: [PATCH] rev-parse --parseopt: fix handling of optional arguments
Date: Wed, 16 Oct 2013 01:47:01 +0200 [thread overview]
Message-ID: <20131015234701.GY4589@mars-attacks.org> (raw)
In-Reply-To: <xmqq4n8ib0uv.fsf@gitster.dls.corp.google.com>
On Tue, 15 Oct 2013, Junio C Hamano wrote:
> Nicolas Vigier <boklm@mars-attacks.org> writes:
>
> > git rev-parse --parseopt does not allow us to see the difference
> > between an option with an optional argument starting with a dash, and an
> > option with an unset optional argument followed by an other option.
> >
> > If I use this script :
> >
> > $ cat /tmp/opt.sh
> > #!/bin/sh
> > OPTIONS_SPEC="\
> > git [options]
> > --
> > q,quiet be quiet
> > S,gpg-sign? GPG-sign commit"
> > echo "$OPTIONS_SPEC" | git rev-parse --parseopt $parseopt_extra -- "$@"
> >
> > Then the following two commands give us the same result :
> >
> > $ /tmp/opt.sh -S -q
> > set -- -S -q --
> > $ /tmp/opt.sh -S-q
> > set -- -S '-q' --
> >
> > We cannot know if '-q' is an argument to '-S' or a new option.
> >
> > With this patch, rev-parse --parseopt will always give an argument to
> > optional options, as an empty string if the argument is unset.
> >
> > The same two commands now give us :
> >
> > $ /tmp/opt.sh -S -q
> > set -- -S '' -q --
> > $ /tmp/opt.sh -S-q
> > set -- -S '-q' --
>
> Two are different, but the former "set -- -S '' -q --" is not what
> you want, either, no? -S with an explicit empty argument and -S
> alone without argument may mean two totally different things, which
> is the whole point of "option with an optional parameter". If some
> code that have been using "rev-parse --parseopt" was happy with
>
> $ /tmp/opt.sh -S
> set -- -S --
>
> and then your updated version gave it this instead:
>
> $ /tmp/opt.sh -S
> set -- -S '' --
>
> wouldn't it be a regression to them?
Indeed, this could be a regression to them. I couldn't find any script
using "rev-parse --parseopt" with an option with an optional argument,
but yes, it doesn't mean that nobody uses that.
next prev parent reply other threads:[~2013-10-15 23:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-15 12:00 [PATCH] rev-parse --parseopt: fix handling of optional arguments Nicolas Vigier
2013-10-15 22:55 ` Junio C Hamano
2013-10-15 23:47 ` Nicolas Vigier [this message]
2013-10-15 23:14 ` Jonathan Nieder
2013-10-15 23:33 ` Junio C Hamano
2013-10-15 23:57 ` Jonathan Nieder
2013-10-16 7:04 ` Johannes Sixt
2013-10-16 8:53 ` Jeff King
2013-10-16 21:40 ` Junio C Hamano
2013-10-16 21:50 ` Jeff King
2013-10-16 10:58 ` Nicolas Vigier
2013-10-16 14:14 ` Nicolas Vigier
2013-10-16 22:33 ` Jonathan Nieder
2013-10-25 20:18 ` [PATCH] rev-parse --parseopt: add the --sticked-long mode Nicolas Vigier
2013-10-25 22:01 ` Junio C Hamano
2013-10-25 22:52 ` Nicolas Vigier
2013-10-25 22:55 ` Junio C Hamano
2013-10-26 21:55 ` Philip Oakley
2013-10-28 15:47 ` Junio C Hamano
2013-10-31 11:08 ` sticked -> stuck Nicolas Vigier
2013-10-31 11:08 ` [PATCH 1/2] Use the word 'stuck' instead of 'sticked' Nicolas Vigier
2013-10-31 19:35 ` Junio C Hamano
2013-10-31 11:08 ` [PATCH 2/2] rev-parse --parseopt: add the --stuck-long mode Nicolas Vigier
2013-10-27 5:45 ` [PATCH] rev-parse --parseopt: add the --sticked-long mode Michael Haggerty
2013-10-15 23:53 ` [PATCH] rev-parse --parseopt: fix handling of optional arguments Nicolas Vigier
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