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From: Jeff King <peff@peff.net>
To: Anders Waldenborg <anders@0x63.nu>
Cc: Christian Couder <christian.couder@gmail.com>,
	Junio C Hamano <gitster@pobox.com>, git <git@vger.kernel.org>,
	Jonathan Tan <jonathantanmy@google.com>
Subject: Re: Questions about trailer configuration semantics
Date: Mon, 27 Jul 2020 19:42:17 -0400	[thread overview]
Message-ID: <20200727234217.GA802697@coredump.intra.peff.net> (raw)
In-Reply-To: <875za8r2fu.fsf@0x63.nu>

On Tue, Jul 28, 2020 at 12:57:51AM +0200, Anders Waldenborg wrote:

> >> > > When configuring a value in trailer.<token>.key it causes the trailer to
> >> > > be normalized to that in "git interpret-trailers --parse".
> >> > > E.g:
> >> > >  $ printf '\naCKed: Zz\n' | \
> >> > >    git -c 'trailer.Acked.key=Acked' interpret-trailers --parse
> >> > >  will emit: "Acked: Zz"
> >>
> >> Yeah, I think that's nice, as it can make sure that the key appears in
> >> the same way. It's true that it would be better if it would be
> >> documented.
> >
> > I'd note that this also happens without --parse.
> 
> Right, and it also happens with "--only-input" (part of "--parse")
> 
> "--only-input" is documented as follows:
> 
>    Output only trailers that exist in the input; do not add any from the
>    command-line or by following configured trailer.* rules.

I think I meant there only that we wouldn't add new trailers (e.g., from
"trailers.*.ifMissing"). But I do agree that it might be simpler if we
can just say "we don't look at trailer.<token>.* config at all in
--only-input mode. I _think_ that's true (we probably do look at
trailer.separators, but the rest of the token-specific ones look like
they're all about writing or modifying, not reading).

> > I don't recall being aware of this prefix matching until this thread, so
> > I doubt that the current behavior of --parse was something I tried for
> > intentionally. It's mostly just using the existing code, plus a few
> > extra options (listed in the docs). I'm not opposed to adding an option
> > to do strict matching and/or avoid rewriting, and then possibly adding
> > that into --parse by default.
> 
> Would that option also be set for the parsing done by "%(trailers)"
> pretty format specifier?

I thnk %(trailers) isn't quite the same as "--parse", because you have
to say "only" or "unfold" yourself. But yeah, that option should
certainly be available there, if not the default.

> > I don't have much of an opinion on which behavior would be preferred.
> > I've never actually had a use case for configuring trailer.*.key, as I
> > usually am only looking at reading existing trailers to collect stats,
> > etc.
> 
> I'm also mainly using in reading trailers (mostly with pretty format
> "%(trailers:key=x)") and then these convenience shortcuts doesn't really
> seem helpful, they rather add a small risk of mangling my data. Not that
> this has caused any problems for me in practice.

Yeah, pondering it a bit more, I think trailer.<token>.* doesn't really
make any sense for any reading operation (including %(trailers) or
--parse). I guess it _could_ be useful to normalize names in some
instances, but it's as likely to confuse or break somebody as to help.

-Peff

  reply	other threads:[~2020-07-27 23:42 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-27 16:45 Anders Waldenborg
2020-07-27 17:18 ` Junio C Hamano
2020-07-27 18:37   ` Christian Couder
2020-07-27 19:40     ` Jeff King
2020-07-27 22:57       ` Anders Waldenborg
2020-07-27 23:42         ` Jeff King [this message]
2020-07-27 20:11     ` Junio C Hamano
2020-07-27 22:17       ` Anders Waldenborg
2020-07-27 23:05         ` Junio C Hamano
2020-07-28  0:01           ` Anders Waldenborg
2020-07-27 21:41     ` Anders Waldenborg
2020-07-27 22:53       ` Junio C Hamano
2020-07-27 23:17         ` Anders Waldenborg
2020-07-28  7:07       ` Christian Couder
2020-07-28 15:41         ` Jeff King
2020-07-28 16:40           ` Junio C Hamano

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