From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> Newsgroups: gmane.emacs.bugs Subject: bug#67611: [PATCH] Add a Pcase pattern `cl-lambda` equivalent to `cl-destructuring-bind` Date: Fri, 12 Jan 2024 10:38:50 -0500 Message-ID: <jwvle8uefqj.fsf-monnier+emacs@gnu.org> References: <277dd49a-e96d-4faf-a22e-aca952354a37@protonmail.com> <jwvplzllrrm.fsf-monnier+emacs@gnu.org> <30f1bf76-1cf1-493e-be4f-38e405d0ecf6@protonmail.com> <CADwFkm=7bc5__WNzZftWt01cnQt4NpnFez+LmqJo9qnieN2nCQ@mail.gmail.com> <CALDnm51VjpjCp4xLPfQ-qR1iwxdDc5XX0i3=8M1vW6vUDizMTw@mail.gmail.com> <jwvwmsfntmc.fsf-monnier+emacs@gnu.org> <CALDnm52=voD5PrnsU58wQR1omwymYdUALEAueqsQTZujU6i0rQ@mail.gmail.com> Reply-To: Stefan Monnier <monnier@iro.umontreal.ca> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; 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Fri, 12 Jan 2024 10:38:51 -0500 (EST) Original-Received: from alfajor (unknown [23.233.149.155]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 92FE2120BA0; Fri, 12 Jan 2024 10:38:51 -0500 (EST) In-Reply-To: <CALDnm52=voD5PrnsU58wQR1omwymYdUALEAueqsQTZujU6i0rQ@mail.gmail.com> ("=?UTF-8?Q?Jo=C3=A3o_?= =?UTF-8?Q?T=C3=A1vora?="'s message of "Fri, 12 Jan 2024 10:46:43 +0000") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs.gnu.org> List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-gnu-emacs>, <mailto:bug-gnu-emacs-request@gnu.org?subject=unsubscribe> List-Archive: <https://lists.gnu.org/archive/html/bug-gnu-emacs> List-Post: <mailto:bug-gnu-emacs@gnu.org> List-Help: <mailto:bug-gnu-emacs-request@gnu.org?subject=help> List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-gnu-emacs>, <mailto:bug-gnu-emacs-request@gnu.org?subject=subscribe> Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:278041 Archived-At: <http://permalink.gmane.org/gmane.emacs.bugs/278041> >> I don't think there's a clear enough need for it right now in Emacs core >> to motivate its integration in Emacs proper. Also, because several >> people have expressed an opinion that leans towards recommending that >> Emacs's own code should probably better avoid using this functionality. > Those people are trying to come up with alternative pattern-matching > libraries which we start to see are not simpler or as powerful > as pcase. Only some of them are. Others are perfectly happy with using `pcase` but still aren't super happy about combining the complexity of `pcase` with that of CL destructuring syntax. Personally I'm rather put off by the difficulty of figuring out which part is using CL syntax and which part is using Pcase: the transition from Pcase to CL is fairly clear (marked by `cl-arglist` or somesuch), but the other is much less so. I'd be happier with a `cl-arglist` which cannot contain nested Pcase patterns (i.e. a one-way street from Pcase to CL) with `cl-destructuring-bind` reimplemented on top of it. I'd also be interested in a new Pcase pattern that provides the part of `cl-arglist` functionality that's missing from current Pcase patterns (like "optional" elements in a list), but with a syntax that blends better in Pcase patterns. > IOW there is no general purpose-util like Alexandria's > 'parse-ordinary-lambda-list', and this could be it. It could > not only be used to simplify and add coherence to many of these > existing compile-time structures, for example helping simplify > things and address FIXMEs in cl-lib.el. That's a different question: improving up cl-lib's implementation would be welcome, yes. That's not what the current patch does, tho. Stefan