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From: Erin Dahlgren <eedahlgren@gmail.com>
To: Jeff King <peff@peff.net>
Cc: Junio C Hamano <gitster@pobox.com>,
	git@vger.kernel.org,
	Johannes Schindelin <johannes.schindelin@gmx.de>
Subject: Re: [PATCH v2] Simplify handling of setup_git_directory_gently() failure cases.
Date: Thu, 27 Dec 2018 15:46:10 -0800	[thread overview]
Message-ID: <CAP_Smy0tMe=mq2u6OFBfYzutHvoLETOyRtFEzLVViupjMLVLrA@mail.gmail.com> (raw)
In-Reply-To: <20181227162417.GA23147@sigill.intra.peff.net>

On Thu, Dec 27, 2018 at 8:24 AM Jeff King <peff@peff.net> wrote:
>
> On Wed, Dec 26, 2018 at 02:22:39PM -0800, Junio C Hamano wrote:
>
> > >> Side note: One of the secondary goals of my patch was to make it
> > >> really obvious that neither the GIT_DIR_HIT_CEILING nor the
> > >> GIT_DIR_HIT_MOUNT_POINT case can get us into the block protected by
> > >> (startup_info->have_repository || getenv(GIT_DIR_ENVIRONMENT)). With
> > >> your suggestion (and it's a fair one) I don't think that's feasible
> > >> without more significant refactoring. Should I just settle with a
> > >> comment that explains this?
> > >
> > > Yeah, I think a comment would probably be sufficient. Though we could
> > > also perhaps make the two cases (i.e., we found a repo or not) more
> > > clear. Something like:
> > >
> > >   if (!*nongit_ok || !*nongit_ok) {
> >
> > WTH is (A || A)?
>
> Heh, I should learn to cut and paste better. This should be:
>
>   if (!nongit_ok || !*nongit_ok)
>
> (which comes from the current code).

Yep, but I think we can benefit from De Morgan's law here, where:

  (!nongit_ok || !*nongit_ok) == (!(nongit_ok && *nongit_ok))

PATCH v3 (just sent) uses that transformation like this:

if (nongit_ok && *nongit_ok) {
  ... startup_info->has_repository = 0;
} else {
  // !nongit_ok || !*nongit_ok
  .. startup_info->has_repository = 1;
}

Because IMHO (nongit_ok && *nongit_ok) is easier to read and reason
about. Added brief comments as well.

Thanks.

- Erin

>
> -Peff

  reply	other threads:[~2018-12-27 23:46 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-13 17:30 [PATCH] " Erin Dahlgren
2018-12-14 10:32 ` Johannes Schindelin
2018-12-16  1:05   ` Erin Dahlgren
2018-12-16  1:05 ` [PATCH v2] " Erin Dahlgren
2018-12-18 12:35   ` Johannes Schindelin
2018-12-18 19:50     ` Erin Dahlgren
2018-12-18 17:54   ` Jeff King
2018-12-18 20:54     ` Erin Dahlgren
2018-12-19 15:59       ` Jeff King
2018-12-26 22:22         ` Junio C Hamano
2018-12-27 16:24           ` Jeff King
2018-12-27 23:46             ` Erin Dahlgren [this message]
2019-01-03  4:54               ` Jeff King
2018-12-27 23:36   ` [PATCH v3] " Erin Dahlgren
2019-01-03  5:14     ` Jeff King
2019-01-03 18:09       ` Junio C Hamano
2019-01-04  8:25         ` Jeff King
2019-01-05 16:57           ` Erin Dahlgren
2019-01-06  6:22             ` Jeff King

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