GNU logs - #79660, boring messages

Message sent to emacs@HIDDEN, me@HIDDEN, bug-gnu-emacs@HIDDEN:

Subject: bug#79660: 30.2.50; let-alist lambdas
Resent-From: Augusto Stoffel <arstoffel@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: emacs@HIDDEN, me@HIDDEN, bug-gnu-emacs@HIDDEN
Resent-Date: Mon, 20 Oct 2025 07:14:02 +0000
Resent-Message-ID: <handler.79660.B.176094439326920 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
To: 79660 <at> debbugs.gnu.org
Cc: Artur Malabarba <emacs@HIDDEN>, Eshel Yaron <me@HIDDEN>
From: Augusto Stoffel <arstoffel@HIDDEN>
Date: Mon, 20 Oct 2025 09:12:49 +0200
Message-ID: <87cy6i2gi6.fsf@HIDDEN>
MIME-Version: 1.0
Content-Type: text/plain
Received-SPF: pass client-ip=2a00:1450:4864:20::631;
 envelope-from=arstoffel@HIDDEN; helo=mail-ej1-x631.google.com
X-Spam_score_int: -20
X-Spam_score: -2.1
X-Spam_bar: --
X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,
 DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,
 RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,
 SPF_PASS=-0.001 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-Spam-Score: 1.0 (+)
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: -0.0 (/)

When working with lots of alists, I often find myself writing

  (lambda (alist) (let-alist alist BODY))

which, while simple, is pretty cacophonous.  So I'd like to suggest
adding a little new macro, let-alist-lambda or lambda-alist such that

  (lambda-alist BODY)

expands to the above.  Perhaps entirely superfluously, here are some
examples of how this would be used and looks pretty nice:

Find someone by name in a list of people:

  (seq-some (lambda-alist (equal .name "John"))
            people)

Sort a list of people by age:

  (sort people :key (lambda-alist .age))

Message sent:

Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Mailer: MIME-tools 5.505 (Entity 5.505)
Content-Type: text/plain; charset=utf-8
X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Augusto Stoffel <arstoffel@HIDDEN>
Subject: bug#79660: Acknowledgement (30.2.50; let-alist lambdas)
Message-ID: <handler.79660.B.176094439326920.ack <at> debbugs.gnu.org>
References: <87cy6i2gi6.fsf@HIDDEN>
X-Gnu-PR-Message: ack 79660
X-Gnu-PR-Package: emacs
Reply-To: 79660 <at> debbugs.gnu.org
Date: Mon, 20 Oct 2025 07:14:02 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

As you requested using X-Debbugs-CC, your message was also forwarded to
  Artur Malabarba <emacs@HIDDEN>, Eshel Yaron <me@eshelyaro=
n.com>
(after having been given a bug report number, if it did not have one).

Your message has been sent to the package maintainer(s):
 bug-gnu-emacs@HIDDEN

If you wish to submit further information on this problem, please
send it to 79660 <at> debbugs.gnu.org.

Please do not send mail to help-debbugs@HIDDEN unless you wish
to report a problem with the Bug-tracking system.

--=20
79660: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D79660
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79660: 30.2.50; let-alist lambdas
Resent-From: Eshel Yaron <me@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN
Resent-Date: Mon, 20 Oct 2025 11:31:01 +0000
Resent-Message-ID: <handler.79660.B79660.17609598061216 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
To: Augusto Stoffel <arstoffel@HIDDEN>
Cc: Artur Malabarba <emacs@HIDDEN>, 79660 <at> debbugs.gnu.org
From: Eshel Yaron <me@HIDDEN>
In-Reply-To: <87cy6i2gi6.fsf@HIDDEN>
References: <87cy6i2gi6.fsf@HIDDEN>
Date: Mon, 20 Oct 2025 13:29:55 +0200
Message-ID: <87jz0pbyks.fsf@HIDDEN>
User-Agent: Gnus/5.13 (Gnus v5.13)
MIME-Version: 1.0
Content-Type: text/plain
Precedence: list
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>

Hi Augusto,

Augusto Stoffel <arstoffel@HIDDEN> writes:

> When working with lots of alists, I often find myself writing
>
>   (lambda (alist) (let-alist alist BODY))
>
> which, while simple, is pretty cacophonous.  So I'd like to suggest
> adding a little new macro, let-alist-lambda or lambda-alist such that
>
>   (lambda-alist BODY)
>
> expands to the above.

Should this be (lambda-alist ALIST BODY...)?  Or is the intention to
"hardcode" the variable name 'alist' for the alist?

I assume I'm CC'd as the last person to touch let-alist, but actually
I've only investigated it to be able to analyze let-alist forms
correctly in what became elisp-scope.el, so I don't really have any
strong opinions about the proposed addition.  Since I'm already here,
I'll give my hot take: let-alist is currently not robust enough to
implement new constructs on top of it.  (Namely, the code analysis in
let-alist--deep-dot-search suffers from both false negatives and false
positives; I can elaborate if anybody's interested, I just don't want to
derail the discussion from adding a new macro to problems in let-alist.)

That said, lambda-alist seems simple enough that it doesn't introduce
any additional issues, and I see that the pattern it simplifies indeed
already occurs in core Emacs code, so why not? :)

Eshel

Last modified: Mon, 20 Oct 2025 11:30:02 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.