Stefan Kangas <stefankangas@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 72344) by debbugs.gnu.org; 19 Aug 2024 16:55:44 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Aug 19 12:55:44 2024 Received: from localhost ([127.0.0.1]:59061 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sg5fU-00021W-0G for submit <at> debbugs.gnu.org; Mon, 19 Aug 2024 12:55:44 -0400 Received: from eggs.gnu.org ([209.51.188.92]:58128) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <rms@HIDDEN>) id 1sg5fR-000213-2s for 72344 <at> debbugs.gnu.org; Mon, 19 Aug 2024 12:55:42 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <rms@HIDDEN>) id 1sg5ed-0004UJ-Ti; Mon, 19 Aug 2024 12:54:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=Date:References:Subject:In-Reply-To:To:From: mime-version; bh=9IOSkeOVFz9xxpQDSmvlljOcPVXa+L7d01TW9XmHdY8=; b=R/wJuHAlI58E y4enDWcgCSwB1CFCjLoWYZoLcAzHFTB30j+uRNXGZTMUq4GVYA6nBzRG8P9DAewhpZgdmlTmbc8l5 6nFXueQ0tuq9Blt/TsVPMwk75wY8Q36S9jjvnTMtUvzaT2d/qs9uM8G2/qVvynD2TeJtOGfYoIqZc J2rrXSnV+0YagT2EKIyVBJUw54B6jP7GDi8ALGhgOSCy0rENUpoWFoMQoZY7ZbqngfBErzxJyTy3U S6qpbVWQz65ywkCUJ3Ujnz62iDVe04GJWY4xy2f/KESS/xVUkbaPVvlZIJCDRfwNaYEf5/jX7rmCh nQfQS1f0PIypvxs+f0a+lg==; Received: from rms by fencepost.gnu.org with local (Exim 4.90_1) (envelope-from <rms@HIDDEN>) id 1sg5eY-0003CP-N2; Mon, 19 Aug 2024 12:54:47 -0400 Content-Type: text/plain; charset=Utf-8 From: Richard Stallman <rms@HIDDEN> To: Eli Zaretskii <eliz@HIDDEN> In-Reply-To: <86bk1t7o7i.fsf@HIDDEN> (message from Eli Zaretskii on Thu, 15 Aug 2024 19:20:01 +0300) Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN> <87zfpg3r4q.fsf@HIDDEN> <87v80326ab.fsf@HIDDEN> <86mslffxfj.fsf@HIDDEN> <87o75vi43v.fsf@HIDDEN> <86jzgj89ev.fsf@HIDDEN> <87ikw2ioih.fsf@HIDDEN> <867cci8fl8.fsf@HIDDEN> <87y14x95s1.fsf@HIDDEN> <86bk1t7o7i.fsf@HIDDEN> Message-Id: <E1sg5eY-0003CP-N2@HIDDEN> Date: Mon, 19 Aug 2024 12:54:46 -0400 X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org, thuna.cing@HIDDEN, spwhitton@HIDDEN 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> Reply-To: rms@HIDDEN Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] I still maintain that we should integrate this fully accept this construct into Emacs, by deleting `cl-' from its name. -- Dr Richard Stallman (https://stallman.org) Chief GNUisance of the GNU Project (https://gnu.org) Founder, Free Software Foundation (https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 15 Aug 2024 16:22:59 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Aug 15 12:22:59 2024 Received: from localhost ([127.0.0.1]:49586 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sedFa-0002QM-LK for submit <at> debbugs.gnu.org; Thu, 15 Aug 2024 12:22:58 -0400 Received: from eggs.gnu.org ([209.51.188.92]:35462) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1sedFY-0002Q6-B9 for 72344 <at> debbugs.gnu.org; Thu, 15 Aug 2024 12:22:56 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1sedCm-00060C-9c; Thu, 15 Aug 2024 12:20:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=eDmV3A8dVA14PwKVnv6+vib6F9YIxEK/ljlXttwzrvY=; b=rabYlMUCt+8Q MW3Xi1PQBl1RfFRiHdVlNPD9T/X+RqWe0tZjFS+LrSak6dn0EEMy+QZELWOJKfgIcpBLL6XSY4x7Z NALJe384iUdjr24Icqn+ZfALBQYtJm7wmNlgfomVSYb73yM3OiE1m6Sihk7UsqeESpBRVbvvtXosU ZaqfU+TUFVO/Hqca9ddj0sDInPE83tKZt5578WM9IfT7Gjldcg42dPyBv9McQ5ohfN3VXwMZMLb58 MlNdZX3b/CBe37Rk6CVQJPX2gm3bRJFaGwJhxz4p9Ojqrgz1VH4l7dLbWcfGmcRo6uUu3ftC+oUks xx7GwQVuuKLT5dQPUva1zA==; Date: Thu, 15 Aug 2024 19:20:01 +0300 Message-Id: <86bk1t7o7i.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Thuna <thuna.cing@HIDDEN> In-Reply-To: <87y14x95s1.fsf@HIDDEN> (message from Thuna on Thu, 15 Aug 2024 17:15:10 +0200) Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN> <87zfpg3r4q.fsf@HIDDEN> <87v80326ab.fsf@HIDDEN> <86mslffxfj.fsf@HIDDEN> <87o75vi43v.fsf@HIDDEN> <86jzgj89ev.fsf@HIDDEN> <87ikw2ioih.fsf@HIDDEN> <867cci8fl8.fsf@HIDDEN> <87y14x95s1.fsf@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org, spwhitton@HIDDEN 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: -3.3 (---) > From: Thuna <thuna.cing@HIDDEN> > Cc: spwhitton@HIDDEN, 72344 <at> debbugs.gnu.org > Date: Thu, 15 Aug 2024 17:15:10 +0200 > > In the meanwhile, what do you think about the docstring? It seems to me > that it mentions what happens to FORMS more accurately, but if there are > problems with it then I'll also need to look into changing that. It still says something similar: + FORMS is +evaluated once during macroexpansion to obtain the list of forms. In +the fully expanded code those forms will be evaluated once before BODY +and their results will be bound to fresh uninterned variables, one for +each form. So I think we need to fix that as well. I hope once we have the text for the manual ready, it will be easier to figure out how to say the same in the doc string.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 15 Aug 2024 15:16:58 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Aug 15 11:16:58 2024 Received: from localhost ([127.0.0.1]:49536 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1secDi-0000ki-GV for submit <at> debbugs.gnu.org; Thu, 15 Aug 2024 11:16:58 -0400 Received: from mail-lj1-f177.google.com ([209.85.208.177]:53442) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <thuna.cing@HIDDEN>) id 1secDg-0000kU-J5 for 72344 <at> debbugs.gnu.org; Thu, 15 Aug 2024 11:16:57 -0400 Received: by mail-lj1-f177.google.com with SMTP id 38308e7fff4ca-2f029e9c9cfso15500051fa.2 for <72344 <at> debbugs.gnu.org>; Thu, 15 Aug 2024 08:16:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1723734914; x=1724339714; darn=debbugs.gnu.org; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=JdFpg/plmB4pljnPLfuVTPrXqMiJG2gcKoyCsGmYkFM=; b=Sz3GNdwefv88K+xAEHCsC5rjwTUjVDgFCQg4a2ng9uOx7L6gcou1Ga14ZzPe3grkmD O2h6+2ASUUA+oZfKLqRf3GWq2BCmn7Lu+VyISFdoXeBbUm7tVuKD5uW3fTmWIf2SgCEq rM3Dt5JBMDaeDwPa/dJQ//8NHTuR+VKNOGBY5k89PrG/Xu9pRzPseFMmdkW3WNa9UdwY hAU7iwpgIUsV5NQJgxJXv2h6LUvfXCdCqh5bFZFXrx5ROM1lmGG6I62zxorR+gRrCHyi jJ/Cr1bvXF/zbgvKQyDu+/O9GsPrGVvLVea5siAmavCGRgjUBBhzWQE9xTs7S7l+X0gK WlSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723734914; x=1724339714; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=JdFpg/plmB4pljnPLfuVTPrXqMiJG2gcKoyCsGmYkFM=; b=qGfA4e+KlJfCGKtwgDUigcrb3V1fTXvS0MP1f6dQPSJf0qaqdlWUPhRm3+vrvnebxQ RMov/RDEsHrh8LRC2Ifnyuncx4d8MF8Eq3rEUTcKo1dd81HXFYwTcT6PAvLI7sjl9G9I q++Ghnr+ZY1iVXaJrHPz37PslTN9gURbl2XA5j8WHIvMvGADX+075OsdCZUY2gkECLGh AEUf9+R+HYA6Nwa5qbGFtShVR2oGYMG0tQB/QqNozDddANWZJoW6S2nF9TakLggzvZ29 GTEIevhzvIEkd2ZxMDo3dcI3Ueiygr5dnufRvUoRh1a7qlM4bCWZi3t3YyPZLjb/4ji0 fWyg== X-Forwarded-Encrypted: i=1; AJvYcCV5flxRRKkozlFpT4lP0x4JoPiD+nayMKnJ2pDH9/CqyC+4xsgq7DE/GvKqLKIViQz9Y/GhzyjBEw9WxbLdC60yZyP2t+0= X-Gm-Message-State: AOJu0YxFoBOG9CZ5FZkq+kW6kU+8nBxz+zeNARb4OkZAeS+u0HU9bq4e LV2iisGRoEb/2Dn5o7ZUefyfxJTp0Di51SoXVDTU7QWX5doPsqtI3JH9rg== X-Google-Smtp-Source: AGHT+IGnYlOgXdOj7npkbfto+OTytLM7ogqQ7YlhO8rWvSpj4Rp13xYNvkgw8UqGtGE+K3cLwg8QuA== X-Received: by 2002:a2e:b889:0:b0:2ef:226e:e150 with SMTP id 38308e7fff4ca-2f3be5da1b0mr48591fa.32.1723734913136; Thu, 15 Aug 2024 08:15:13 -0700 (PDT) Received: from thuna-lis3 ([85.106.105.81]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a838396c62asm114459666b.209.2024.08.15.08.15.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Aug 2024 08:15:12 -0700 (PDT) From: Thuna <thuna.cing@HIDDEN> To: Eli Zaretskii <eliz@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <867cci8fl8.fsf@HIDDEN> References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN> <87zfpg3r4q.fsf@HIDDEN> <87v80326ab.fsf@HIDDEN> <86mslffxfj.fsf@HIDDEN> <87o75vi43v.fsf@HIDDEN> <86jzgj89ev.fsf@HIDDEN> <87ikw2ioih.fsf@HIDDEN> <867cci8fl8.fsf@HIDDEN> Date: Thu, 15 Aug 2024 17:15:10 +0200 Message-ID: <87y14x95s1.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org, spwhitton@HIDDEN 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: -1.0 (-) > Sorry, I'm now completely confused and bewildered. Earlier you said > 'it is "forms", which is evaluated to obtain a list of forms', now you > seem to be saying that this evaluation is not relevant to the macro > (i.e. is done before the macro is called)? No, no, it's rather that the evaluation is a given, the same way it is in, e.g. if-let (and also cl-once-only, where the evaluation of form(1) to obtain form(2) during 2 isn't explicitly mentioned). > Anyway, what I'm looking for is not _my_ understanding, but some text > for the manual and the doc strings which will explain this to the > reader. So maybe suggest text that you think is both accurate and not > supposed to confuse, and let's take it from there. Regardless, if even you are confused, then something has certainly gone wrong with my explanation, so I'll try to get another draft going. In the meanwhile, what do you think about the docstring? It seems to me that it mentions what happens to FORMS more accurately, but if there are problems with it then I'll also need to look into changing that.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Eli Zaretskii <eliz@HIDDEN>
To: Thuna <thuna.cing@HIDDEN>
In-Reply-To: <87ikw2ioih.fsf@HIDDEN> (message from Thuna on Thu, 15 Aug
2024 03:05:42 +0200)
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
References: <87y15l1aj8.fsf@HIDDEN>
<8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN>
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<86mslffxfj.fsf@HIDDEN> <87o75vi43v.fsf@HIDDEN>
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> From: Thuna <thuna.cing@HIDDEN>
> Cc: spwhitton@HIDDEN, 72344 <at> debbugs.gnu.org
> Date: Thu, 15 Aug 2024 03:05:42 +0200
>
> >> >> +@defmac cl-once-only* (variable forms) body
> >> > ^^^^^
> >> > Shouldn't this be "forms@dots{}"? or maybe "form@dots{}"?
> >>
> >> No, it is "forms", which is evaluated to obtain a list of forms, each of
> >> which is individually analogous to "form" in `cl-once-only' as used in
> >> the info. Maybe I have failed to communicate this properly. Would an
> >> example like
> >>
> >> (cl-defmacro foo ((&rest optforms) body &rest forms)
> >> (cl-once-only* (all-forms (append optforms forms)) ...))
> >>
> >> help?
> >
> > Not really. What is missing is the explicit statement that FORMS is
> > evaluated to yield a list of forms. (Btw, why is it called "FORMS",
> > plural, when it is actually a single form that yields a list of forms
> > only when evaluated?). The text you wrote:
> >
> > +Each element of @var{variable} may be used to refer to the result of
> > +evaluating the corresponding form in @var{forms} within @var{body}.
> >
> > doesn't mention that FORMS is evaluated, and makes it sound like FORMS
> > includes several forms to begin with ("corresponding form in FORMS").
> >
> > This is in direct contradiction with what you explained now, and
> > therefore this text needs to be amended.
>
> Sorry, this whole thing is a bit confusing due to the layers involved, so let
> me try to explain it again and also try to explain my rationale. Maybe it
> will answer some of your questions and/or clear up some miscommunication.
>
> There are three evaluation times here:
> 1. [us] Evaluation of cl-once-only* while macroexpanding (defmacro foo ...)
> 2. [macro author] Evaluation of foo while macroexpanding (foo ...)
> 3. [macro user] Evaluation of the macroexpansion of (foo ...)
>
> During 1, FORMS is a single form(1) and VARIABLE is a (non-constant)
> symbol(1).
>
> During 2, this form(1) is evaluated to obtain a list of forms(2), and
> symbol(1) is bound to a list of symbols(2) within BODY.
>
> During 3, each symbol(2) is bound to the result of evaluating the
> corresponding form(2).
>
> The macro author interfaces with `cl-once-only*' by passing to it
> - a list of forms(2) which will be evaluated during 3.
> - a symbol(1) which, during 2, will be bound to a list of symbols(2), each of
> which will hold the value of the corresponding form(2) during 3.
> so from their perspective FORMS is in fact a list of forms.
>
> While I was writing I was trying to use terms the way a macro author would
> conceptualize, so the name "FORMS" follows from it being a list of forms(2)
> during 2.
>
> Also, again from the macro author's perspective,
> > corresponding form in FORMS
> > it ... is evaluated to obtain a list of forms
> > FORMS includes several forms to begin with
> ends up reading as
> > corresponding form(2) in [the list of forms(2)]
> > [form(1)] ... is evaluated to obtain [the] list of forms(2)
> > [the list of forms(2)] includes several forms to begin with
> which isn't a contradiction. I suspect you (understandably) read every `form'
> as form(1), under which interpretation it would indeed be a contradiction.
>
> I agree that it needs to be mentioned that FORMS is evaluated (during 2).
> I'll probably need to rewrite this thing again, so I'll try to put it in then.
Sorry, I'm now completely confused and bewildered. Earlier you said
'it is "forms", which is evaluated to obtain a list of forms', now you
seem to be saying that this evaluation is not relevant to the macro
(i.e. is done before the macro is called)?
Anyway, what I'm looking for is not _my_ understanding, but some text
for the manual and the doc strings which will explain this to the
reader. So maybe suggest text that you think is both accurate and not
supposed to confuse, and let's take it from there.
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From: Thuna <thuna.cing@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
In-Reply-To: <86jzgj89ev.fsf@HIDDEN>
References: <87y15l1aj8.fsf@HIDDEN>
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Date: Thu, 15 Aug 2024 03:05:42 +0200
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>> >> +@defmac cl-once-only* (variable forms) body
>> > ^^^^^
>> > Shouldn't this be "forms@dots{}"? or maybe "form@dots{}"?
>>
>> No, it is "forms", which is evaluated to obtain a list of forms, each of
>> which is individually analogous to "form" in `cl-once-only' as used in
>> the info. Maybe I have failed to communicate this properly. Would an
>> example like
>>
>> (cl-defmacro foo ((&rest optforms) body &rest forms)
>> (cl-once-only* (all-forms (append optforms forms)) ...))
>>
>> help?
>
> Not really. What is missing is the explicit statement that FORMS is
> evaluated to yield a list of forms. (Btw, why is it called "FORMS",
> plural, when it is actually a single form that yields a list of forms
> only when evaluated?). The text you wrote:
>
> +Each element of @var{variable} may be used to refer to the result of
> +evaluating the corresponding form in @var{forms} within @var{body}.
>
> doesn't mention that FORMS is evaluated, and makes it sound like FORMS
> includes several forms to begin with ("corresponding form in FORMS").
>
> This is in direct contradiction with what you explained now, and
> therefore this text needs to be amended.
Sorry, this whole thing is a bit confusing due to the layers involved, so let
me try to explain it again and also try to explain my rationale. Maybe it
will answer some of your questions and/or clear up some miscommunication.
There are three evaluation times here:
1. [us] Evaluation of cl-once-only* while macroexpanding (defmacro foo ...)
2. [macro author] Evaluation of foo while macroexpanding (foo ...)
3. [macro user] Evaluation of the macroexpansion of (foo ...)
During 1, FORMS is a single form(1) and VARIABLE is a (non-constant)
symbol(1).
During 2, this form(1) is evaluated to obtain a list of forms(2), and
symbol(1) is bound to a list of symbols(2) within BODY.
During 3, each symbol(2) is bound to the result of evaluating the
corresponding form(2).
The macro author interfaces with `cl-once-only*' by passing to it
- a list of forms(2) which will be evaluated during 3.
- a symbol(1) which, during 2, will be bound to a list of symbols(2), each of
which will hold the value of the corresponding form(2) during 3.
so from their perspective FORMS is in fact a list of forms.
While I was writing I was trying to use terms the way a macro author would
conceptualize, so the name "FORMS" follows from it being a list of forms(2)
during 2.
Also, again from the macro author's perspective,
> corresponding form in FORMS
> it ... is evaluated to obtain a list of forms
> FORMS includes several forms to begin with
ends up reading as
> corresponding form(2) in [the list of forms(2)]
> [form(1)] ... is evaluated to obtain [the] list of forms(2)
> [the list of forms(2)] includes several forms to begin with
which isn't a contradiction. I suspect you (understandably) read every `form'
as form(1), under which interpretation it would indeed be a contradiction.
I agree that it needs to be mentioned that FORMS is evaluated (during 2).
I'll probably need to rewrite this thing again, so I'll try to put it in then.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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Date: Wed, 14 Aug 2024 17:29:44 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Thuna <thuna.cing@HIDDEN>
In-Reply-To: <87o75vi43v.fsf@HIDDEN> (message from Thuna on Wed, 14 Aug
2024 16:14:12 +0200)
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
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> From: Thuna <thuna.cing@HIDDEN>
> Cc: spwhitton@HIDDEN, 72344 <at> debbugs.gnu.org
> Date: Wed, 14 Aug 2024 16:14:12 +0200
>
> >> +@defmac cl-once-only* (variable forms) body
> > ^^^^^
> > Shouldn't this be "forms@dots{}"? or maybe "form@dots{}"?
>
> No, it is "forms", which is evaluated to obtain a list of forms, each of
> which is individually analogous to "form" in `cl-once-only' as used in
> the info. Maybe I have failed to communicate this properly. Would an
> example like
>
> (cl-defmacro foo ((&rest optforms) body &rest forms)
> (cl-once-only* (all-forms (append optforms forms)) ...))
>
> help?
Not really. What is missing is the explicit statement that FORMS is
evaluated to yield a list of forms. (Btw, why is it called "FORMS",
plural, when it is actually a single form that yields a list of forms
only when evaluated?). The text you wrote:
+Each element of @var{variable} may be used to refer to the result of
+evaluating the corresponding form in @var{forms} within @var{body}.
doesn't mention that FORMS is evaluated, and makes it sound like FORMS
includes several forms to begin with ("corresponding form in FORMS").
This is in direct contradiction with what you explained now, and
therefore this text needs to be amended.
Thanks.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Thuna <thuna.cing@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
In-Reply-To: <86mslffxfj.fsf@HIDDEN>
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>> +@defmac cl-once-only* (variable forms) body
> ^^^^^
> Shouldn't this be "forms@dots{}"? or maybe "form@dots{}"?
No, it is "forms", which is evaluated to obtain a list of forms, each of
which is individually analogous to "form" in `cl-once-only' as used in
the info. Maybe I have failed to communicate this properly. Would an
example like
(cl-defmacro foo ((&rest optforms) body &rest forms)
(cl-once-only* (all-forms (append optforms forms)) ...))
help? (I am not sure how I would integrate this into the info but
still.)
>> +This macro is a version of @code{cl-once-only} which takes an
>> +arbitrarily long list of forms. This macro is primarily meant to be
>> +used where the number of forms is unknown and thus @code{cl-once-only}
>> +cannot work, such as those obtained by a @code{&body} argument.
>
> The last sentence above needs to be restructured. Perhaps simply move
> the "such as" part to the end of the previous sentence.
Yes, that would work.
>> +In a call like @code{(my-list ((pop foo) (cl-incf bar) ...) ...)} the
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Such long expressions should be wrapped in @w{..}, to prevent them
> from being split between two lines. Also, please use @dots{} instead
> of a literal "..." to generate ellipsis (it will look better in the
> printed version of the manual).
Yes, sorry, that was the case in the previous draft but I ended up
missing it when switching from the org document to texi.
>> +@code{pop} and @code{cl-incf} will be evaluated exactly once, ensuring
>> +their side effects are not applied twice. This code is however very
>> +complex, in the same way code not using @code{cl-once-only} is.
>> +
>> +Using @code{cl-once-only} is not possible directly due to it expecting
>> +individual forms which can be evaluated. This can be worked around by
>> +assigning to a variable @code{`(list ,@@vars)} which @emph{can} be
>> +evaluated:
>> +
>> +@example
>> +(defmacro my-list (vals &rest forms)
>> + (cl-once-only ((vals `(list ,@@vals)))
>> + `(list (cl-first ,vals)
>> + (cl-second ,vals)
>> + ,vals ; Does not splice
>> + (progn ,@@forms))))
>> +@end example
>> +
>> +There are two problems which both result from the fact that @code{vals}
>> +is not a list inside the body of @code{cl-once-only}: 1. @code{vals}
>> +cannot be spliced in the way it can in the previous example and
>> +2. accessing individual elements of @code{vals} can only be done by
>> +accessing the resulting list @emph{during evaluation}. Compare this to
>> +the example using @code{cl-once-only*}:
>
> Please replace "1. " and "2. " with "First, " and "Second, ",
> respectively. Alternatively, if you really want a numbered list, you
> could use
>
> @enumerate
> @item @code{vals} cannot be spliced in the way [...]
I'll switch to "{First,Second}, ".
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 14 Aug 2024 09:47:59 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Aug 14 05:47:59 2024 Received: from localhost ([127.0.0.1]:46135 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1seAbn-0006WR-Fn for submit <at> debbugs.gnu.org; Wed, 14 Aug 2024 05:47:59 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:33458) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1seAbk-0006WB-PS for 72344 <at> debbugs.gnu.org; Wed, 14 Aug 2024 05:47:57 -0400 DKIM-Signature: a=rsa-sha256; b=PxVVP81pALPu2iCO6o+teajJ7BQmrreX7E/aNPw2xzYFz583OsmAy1Bt7qQBLORrxLXbvFyT0Pj4MMZa0B3hOFShAvXWlTeRMRCdVOoyQJcXVIaTa/Y4e1V5Gt6+XDHMb1tk5aPruCU146D49LJ7SXAaX8BV9OuH/of8hmaSjczOsLlhJ5bBMLB3FvCJBSu448YBzL4k+dhyOVVGpjAGKnXJEmuKalr3TCyhT9JOrJ1IhgREirsLLxdBu9/Bjys3aRlBdFpinzuqXwH4JHTw1MrnML9DO4aCO9LNjDutaHl+Elc+TKK/hQjI9O/wJ1YW1stXP4UpTsicxu3FeEaaxA==; s=purelymail1; d=spwhitton.name; v=1; bh=nK/lshYWzzM3jFbMdY2w5fMoIDJoRIVrPK+5e155UuE=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=Aa2oKcMgJqcxmF5ktN8pd+aYaqCh8NniL3OZiGbbX5F3flNOpr5cJFnCC7lCMaJXpY+xHDh5R6v84faidcj1AjMAW0QmRJPiMWm09XqzNB5pP7I12hiwkfVHSszgm5zPGnJR1AEjex8lNoSISVF61bhoyF88xaNQkQt140XZYQsJlJH56A60KN1AnBRF/EA+NhHkpPmgoqvXahKJ4kuCmXyjQbbrr+i/PRIFXGUkRh29H+AMSKC9uGRp7oGc/zcUKbqxnTHv0l5STo1frS1r8MKg2Cm9VTa1d+z4sxRLrY6YXpI8Ttw7rcJQMaS5TqqbFk1nOlVq1/ZT2fxl5RnSPA==; s=purelymail1; d=purelymail.com; v=1; bh=nK/lshYWzzM3jFbMdY2w5fMoIDJoRIVrPK+5e155UuE=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id 939008562; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Wed, 14 Aug 2024 09:47:10 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id B80EB7EE260; Wed, 14 Aug 2024 17:47:05 +0800 (CST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <87v80326ab.fsf@HIDDEN> (Thuna's message of "Wed, 14 Aug 2024 04:21:32 +0200") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN> <87zfpg3r4q.fsf@HIDDEN> <87v80326ab.fsf@HIDDEN> Date: Wed, 14 Aug 2024 17:47:05 +0800 Message-ID: <87wmkj3086.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello, On Wed 14 Aug 2024 at 04:21am +02, Thuna wrote: >> You're not keen on either of my other suggestions, right? >> >> cl-once-only-many, cl-once-only-these > > No, I am really *really* not that enthusiastic about either of those > names. `*-these' is completely out of the question, and `*-many' > is... fine, but IMO sounds worse than `*-multiple'. Okay, then let's go with cl-once-only-multiple. -- Sean Whitton
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Date: Wed, 14 Aug 2024 09:09:04 +0300
Message-Id: <86mslffxfj.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Thuna <thuna.cing@HIDDEN>
In-Reply-To: <87v80326ab.fsf@HIDDEN> (message from Thuna on Wed, 14 Aug
2024 04:21:32 +0200)
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
References: <87y15l1aj8.fsf@HIDDEN>
<8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN>
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<87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN>
<87zfpg3r4q.fsf@HIDDEN> <87v80326ab.fsf@HIDDEN>
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> Cc: 72344 <at> debbugs.gnu.org
> From: Thuna <thuna.cing@HIDDEN>
> Date: Wed, 14 Aug 2024 04:21:32 +0200
>
> Oops, sorry for the bad patch, I've attached the full diff.
Thanks, a few comments about the changes to the manual:
> +@defmac cl-once-only* (variable forms) body
^^^^^
Shouldn't this be "forms@dots{}"? or maybe "form@dots{}"?
> +This macro is a version of @code{cl-once-only} which takes an
> +arbitrarily long list of forms. This macro is primarily meant to be
> +used where the number of forms is unknown and thus @code{cl-once-only}
> +cannot work, such as those obtained by a @code{&body} argument.
The last sentence above needs to be restructured. Perhaps simply move
the "such as" part to the end of the previous sentence.
> +In a call like @code{(my-list ((pop foo) (cl-incf bar) ...) ...)} the
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Such long expressions should be wrapped in @w{..}, to prevent them
from being split between two lines. Also, please use @dots{} instead
of a literal "..." to generate ellipsis (it will look better in the
printed version of the manual).
> +@code{pop} and @code{cl-incf} will be evaluated exactly once, ensuring
> +their side effects are not applied twice. This code is however very
> +complex, in the same way code not using @code{cl-once-only} is.
> +
> +Using @code{cl-once-only} is not possible directly due to it expecting
> +individual forms which can be evaluated. This can be worked around by
> +assigning to a variable @code{`(list ,@@vars)} which @emph{can} be
> +evaluated:
> +
> +@example
> +(defmacro my-list (vals &rest forms)
> + (cl-once-only ((vals `(list ,@@vals)))
> + `(list (cl-first ,vals)
> + (cl-second ,vals)
> + ,vals ; Does not splice
> + (progn ,@@forms))))
> +@end example
> +
> +There are two problems which both result from the fact that @code{vals}
> +is not a list inside the body of @code{cl-once-only}: 1. @code{vals}
> +cannot be spliced in the way it can in the previous example and
> +2. accessing individual elements of @code{vals} can only be done by
> +accessing the resulting list @emph{during evaluation}. Compare this to
> +the example using @code{cl-once-only*}:
Please replace "1. " and "2. " with "First, " and "Second, ",
respectively. Alternatively, if you really want a numbered list, you
could use
@enumerate
@item @code{vals} cannot be spliced in the way [...]
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Thuna <thuna.cing@HIDDEN>
To: Sean Whitton <spwhitton@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
In-Reply-To: <87zfpg3r4q.fsf@HIDDEN>
References: <87y15l1aj8.fsf@HIDDEN>
<8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN>
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<87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN>
<87zfpg3r4q.fsf@HIDDEN>
Date: Wed, 14 Aug 2024 04:21:32 +0200
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--=-=-=
Content-Type: text/plain
> You're not keen on either of my other suggestions, right?
>
> cl-once-only-many, cl-once-only-these
No, I am really *really* not that enthusiastic about either of those
names. `*-these' is completely out of the question, and `*-many'
is... fine, but IMO sounds worse than `*-multiple'.
> I guess I am hung up on how -multiple- is already used in CL names,
> but it comes *before* the things that are multiple. But I believe you
> don't like cl-multiple-once-only.
`multiple' seems to be used exclusively in `cl-multiple-value-*' names,
so there is some possibility that this might maybe be confused as a part
of that suite, but I don't think it's a particularly significant one.
> The interdiff isn't too helpful to me here. I'd prefer to review a
> complete patch against master.
Oops, sorry for the bad patch, I've attached the full diff.
--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline; filename=cl-texi-second-draft.patch
diff --git a/doc/misc/cl.texi b/doc/misc/cl.texi
index 113029700ec..de9f0565d03 100644
--- a/doc/misc/cl.texi
+++ b/doc/misc/cl.texi
@@ -999,7 +999,7 @@ Control Structure
* Iteration:: @code{cl-do}, @code{cl-dotimes}, @code{cl-dolist}, @code{cl-do-symbols}.
* Loop Facility:: The Common Lisp @code{loop} macro.
* Multiple Values:: @code{cl-values}, @code{cl-multiple-value-bind}, etc.
-* Macro-Writing Macros:: @code{cl-with-gensyms}, @code{cl-once-only}.
+* Macro-Writing Macros:: @code{cl-with-gensyms}, @code{cl-once-only}, @code{cl-once-only*}.
@end menu
@node Assignment
@@ -2683,6 +2683,73 @@ Macro-Writing Macros
@end example
@end defmac
+@defmac cl-once-only* (variable forms) body
+This macro is a version of @code{cl-once-only} which takes an
+arbitrarily long list of forms. This macro is primarily meant to be
+used where the number of forms is unknown and thus @code{cl-once-only}
+cannot work, such as those obtained by a @code{&body} argument.
+
+Each element of @var{variable} may be used to refer to the result of
+evaluating the corresponding form in @var{forms} within @var{body}.
+@code{cl-once-only*} binds @var{variable} to a list of fresh uninterned
+symbols. @code{cl-once-only*} furthermore wraps the final expansion
+such that each form is evaluated in order and its result is bound to the
+corresponding symbol.
+
+Like @code{cl-once-only}, the first argument can be a symbol @var{variable}, which
+is equivalent to writing @code{(variable variable)}.
+
+Consider the following macro:
+
+@example
+(defmacro my-list (vals &rest forms)
+ (let ((val-results (mapcar (lambda (_) (gensym)) vals)))
+ `(let* ,(cl-mapcar #'list val-results vals)
+ (list ,(cl-first val-results)
+ ,(cl-second val-results)
+ ,@@val-results
+ (progn ,@@forms)))))
+@end example
+
+In a call like @code{(my-list ((pop foo) (cl-incf bar) ...) ...)} the
+@code{pop} and @code{cl-incf} will be evaluated exactly once, ensuring
+their side effects are not applied twice. This code is however very
+complex, in the same way code not using @code{cl-once-only} is.
+
+Using @code{cl-once-only} is not possible directly due to it expecting
+individual forms which can be evaluated. This can be worked around by
+assigning to a variable @code{`(list ,@@vars)} which @emph{can} be
+evaluated:
+
+@example
+(defmacro my-list (vals &rest forms)
+ (cl-once-only ((vals `(list ,@@vals)))
+ `(list (cl-first ,vals)
+ (cl-second ,vals)
+ ,vals ; Does not splice
+ (progn ,@@forms))))
+@end example
+
+There are two problems which both result from the fact that @code{vals}
+is not a list inside the body of @code{cl-once-only}: 1. @code{vals}
+cannot be spliced in the way it can in the previous example and
+2. accessing individual elements of @code{vals} can only be done by
+accessing the resulting list @emph{during evaluation}. Compare this to
+the example using @code{cl-once-only*}:
+
+@example
+(defmacro my-list (vals &rest forms)
+ (cl-once-only* vals
+ `(list ,(cl-first vals)
+ ,(cl-second vals)
+ ,@@vals
+ (progn ,@@forms))))
+@end example
+
+which preserves the fact the @var{vals} is a list and removes
+boiler-plate code for generating and assigning temporary variables.
+@end defmac
+
@node Macros
@chapter Macros
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 2e501005bf7..adb9cb29104 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -2544,6 +2544,54 @@ cl-once-only
collect `(,(car name) ,gensym))
,@body)))))
+(defmacro cl-once-only* (listvar &rest body)
+ "Generate code to evaluate the list of FORMS just once in BODY.
+
+This is a macro to be used while defining other macros. FORMS is
+evaluated once during macroexpansion to obtain the list of forms. In
+the fully expanded code those forms will be evaluated once before BODY
+and their results will be bound to fresh uninterned variables, one for
+each form.
+
+Within the macro VARIABLE is a list of these symbols in order, such that
+each form in FORMS can be accessed by using the corresponding element in
+VARIABLE.
+
+The common case of `(cl-once-only* (VARIABLE VARIABLE) ...)' can be
+written shortly as `(cl-once-only* VARIABLE ...)'.
+
+For example, the following macro:
+
+ (defmacro my-list (head &rest args)
+ (cl-once-only* args
+ \\=`(list (,head ,@args) ,@args)))
+
+when called like
+
+ (let ((x \\='(1 5 4)))
+ (my-list + (pop x) (1+ (pop x)) (1- (pop x))))
+
+will expand into
+
+ (let ((x \\='(1 5 4)))
+ (let* ((arg1 (pop x)) (arg2 (1+ (pop x))) (arg3 (1- (pop x))))
+ (list (+ arg1 arg2 arg3) arg1 arg2 arg3)))
+
+and the arguments will be evaluated only once and in order.
+
+\(fn (VARIABLE FORMS) &body BODY)"
+ (declare (debug ([&or symbolp (symbolp form)] body)) (indent 1))
+ (let* ((variable (if (symbolp listvar) listvar (nth 0 listvar)))
+ (forms (if (symbolp listvar) listvar (nth 1 listvar)))
+ (results* (gensym (symbol-name variable))))
+ (cl-once-only (forms)
+ `(let ((,results*
+ (cl-loop for i from 1 to (length ,forms) collect
+ (make-symbol (format "%s$%d" ',(symbol-name variable) i)))))
+ `(let* ,(cl-mapcar #'list ,results* ,forms)
+ ,(let ((,variable ,results*))
+ ,@body))))))
+
;;; Multiple values.
;;;###autoload
--=-=-=--
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Sean Whitton <spwhitton@HIDDEN>
To: Thuna <thuna.cing@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
In-Reply-To: <874j7o2kcq.fsf@HIDDEN> (Thuna's message of "Tue, 13 Aug 2024
23:17:41 +0200")
References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN>
<87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN>
<871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN>
<874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN>
<874j7o2kcq.fsf@HIDDEN>
Date: Wed, 14 Aug 2024 08:05:57 +0800
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Hello,
On Tue 13 Aug 2024 at 11:17pm +02, Thuna wrote:
>>> If `cl-once-only-multiple' is fine by you then I would prefer that over
>>> `cl-once-only-rest' and `cl-once-only-mult'. It would help to get more
>>> suggestions, but I don't think anyone else will be chiming in at this
>>> point.
>>
>> It's just really long :)
>
> I do agree that it's decently long, but it's probably fine...?
> `cl-destructuring-bind' is the same length and I don't find that too
> annoying to write out, though maybe that's just me.
You're not keen on either of my other suggestions, right?
cl-once-only-many, cl-once-only-these
I guess I am hung up on how -multiple- is already used in CL names, but
it comes *before* the things that are multiple. But I believe you don't
like cl-multiple-once-only.
> I don't have any new ideas for the name, but here's a second draft which
> tries to adapt the example used in `cl-once-only'. I was unable to get
> the `mapcar' in the first example any more concise, so some thoughts on
> rewording and fixing various parts of the text would be nice.
The interdiff isn't too helpful to me here. I'd prefer to review a
complete patch against master.
--
Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 14 Aug 2024 00:02:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Aug 13 20:02:06 2024 Received: from localhost ([127.0.0.1]:45705 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1se1Sn-0006fW-Tc for submit <at> debbugs.gnu.org; Tue, 13 Aug 2024 20:02:06 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:46062) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1se1Sl-0006eq-8r for 72344 <at> debbugs.gnu.org; Tue, 13 Aug 2024 20:02:04 -0400 DKIM-Signature: a=rsa-sha256; b=Id0v7La/I9W7G+JTSUlSuZj2WhgDG5LZwcCsDuEmplOS8hPW7o6PBAjyEnUtxHFIh8HJr3Ai29FhvVkqdNl9iYqvB29P1AbkHtgqnjxccywtd5rQtwTpzdFgeyekkkmtMLuJC/Gus+Q7kfPBLU7c/qa9+xBzHN6+Qb3/jHdwbQzoqxYcoMb+v5rn4X6/2HLRZ2C+rpjdyEqA/wVUKK+BC8N+ltTBvIk9xjRqTXJh7baJNMebWlfkh2nD9kiZin1x+mAeSKyVEfv30N9g3nTKzMPXew3feZzhTqp3bf02p3n4lyPt6/alYxPJAusfnqOg3ctxn+DtBJlDCMDBJ7sfcw==; s=purelymail1; d=spwhitton.name; v=1; bh=S0/9ORI4i22UV1L5jfI+zK1Cfg0y0yaZzPYz8t30aD0=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=TxOzcDL7R0z4vM136VZpDZrnWK+4v3nLAZ7qOsriUFERCxBRZQ1+SYyuFDwP1/7WlcBKlEz/BMGphlkkCJx2BKftrRE8q08TuApFG1JZ6rBLntASv7C2B30Zhqf1jT0SyHMmzpnXuIBmf+WHBUDn+ss9aDEHkvtl/mbfoEbynAaNMK4bFSPrmR7vPyXKzmXb4OV2wNyx0CXeTQV10m1tbZvSRvCd06Mmp5fDZlInS32iAtTxnIoXHpT78gjjWe6Td2FOWFszx8aAIv/lSfevTioEA8XvvYbGdLt+6D+ylhkwwVS1Sb4LwGnSm8m4pjKdU2T4+tHNq1VoNqB+WETNTw==; s=purelymail1; d=purelymail.com; v=1; bh=S0/9ORI4i22UV1L5jfI+zK1Cfg0y0yaZzPYz8t30aD0=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id -734656803; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Wed, 14 Aug 2024 00:01:20 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id 3E8FB7EC82B; Wed, 14 Aug 2024 08:01:16 +0800 (CST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: [External] : Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <87y15012yo.fsf@HIDDEN> (Thuna's message of "Wed, 14 Aug 2024 00:18:39 +0200") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN> <DS7PR10MB5232BABC88D397563AB472CBF3862@HIDDEN> <87y15012yo.fsf@HIDDEN> Date: Wed, 14 Aug 2024 08:01:16 +0800 Message-ID: <87bk1w55wz.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org, Drew Adams <drew.adams@HIDDEN> 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: -1.0 (-) Hello, On Wed 14 Aug 2024 at 12:18am +02, Thuna wrote: >>> If Drew wants to start a new conversation to move `cl-once-only' (and >>> also this) out of cl-lib we can also just go with any name now and then >>> finalize it afterwards, though of all the names the one I favor is still >>> `cl-once-only-multiple' above all others (sans `cl-once-only*' which is >>> not an option - unless if you changed your mind about it?). >> >> I've said all I have to say on the matter. I seem to be a minority of >> one, and won't bother starting any new thread about it. > > I don't know what the overall opinion is, but I do not necessarily > disagree with you that cl-lib should be for (and only for) emulating > Common Lisp. While I do not know the scope and extent of the changes > you want to make, I support moving with-gensyms and once-only (and > consequently this) out of cl-lib. However I simply do not have the > energy to start (more) arguments and try to convince people to make this > change. They were quite deliberately put under cl-, actually, when I added them. -- Sean Whitton
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Tue, 13 Aug 2024 22:57:21 +0000 From: Drew Adams <drew.adams@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: RE: [External] : Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms Thread-Topic: [External] : Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms Thread-Index: AQHa7c7E5MTcThhNNkaf80wrk/R6qbIly+Bw Date: Tue, 13 Aug 2024 22:57:21 +0000 Message-ID: <DS7PR10MB5232086F8A167DC6B381CAAFF3862@HIDDEN> References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> <87r0b1su7p.fsf@HIDDEN> <874j7o2kcq.fsf@HIDDEN> <DS7PR10MB5232BABC88D397563AB472CBF3862@HIDDEN> <87y15012yo.fsf@HIDDEN> In-Reply-To: <87y15012yo.fsf@HIDDEN> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DS7PR10MB5232:EE_|CH3PR10MB7986:EE_ x-ms-office365-filtering-correlation-id: 09bdfad9-0cc6-4065-c459-08dcbbeb49f8 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DS7PR10MB5232.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 09bdfad9-0cc6-4065-c459-08dcbbeb49f8 X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Aug 2024 22:57:21.1966 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: YIYwdrfxklwjEsZoSZbK2VfWmCZ0uHXKoOhONhQJ18R6ceTZJI+/btqH5dB3BrgvmCd1cCums8kTjfLyJai6xg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR10MB7986 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-13_12,2024-08-13_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxscore=0 bulkscore=0 phishscore=0 malwarescore=0 suspectscore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2407110000 definitions=main-2408130165 X-Proofpoint-ORIG-GUID: _15ywcY5f1czB3nnTTsZYZccFm6nKudd X-Proofpoint-GUID: _15ywcY5f1czB3nnTTsZYZccFm6nKudd X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: "72344 <at> debbugs.gnu.org" <72344 <at> debbugs.gnu.org>, Sean Whitton <spwhitton@HIDDEN> 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: -1.0 (-) > >> If Drew wants to start a new conversation to move `cl-once-only' (and > >> also this) out of cl-lib we can also just go with any name now and > then > >> finalize it afterwards, though of all the names the one I favor is > still > >> `cl-once-only-multiple' above all others (sans `cl-once-only*' which > is > >> not an option - unless if you changed your mind about it?). > > > > I've said all I have to say on the matter. I seem to be a minority of > > one, and won't bother starting any new thread about it. >=20 > I don't know what the overall opinion is, but I do not necessarily > disagree with you that cl-lib should be for (and only for) emulating > Common Lisp. While I do not know the scope and extent of the changes > you want to make, I support moving with-gensyms and once-only (and > consequently this) out of cl-lib. However I simply do not have the > energy to start (more) arguments and try to convince people to make this > change. Understood. Thanks for your consideration. > > I have no objection to using prefix cl-- (internal prefix) for utility > > functions & macros in the library - i.e., for plumbing needed to > > support the actual emulation. >=20 > When talking about this patch in a vacuum, I am vehemently opposed to > using the `cl--' prefix - this macro is a public-facing one, and making > it internal is a guaranteed way to make sure no one uses it. It also > does not make sense that this macro (and only this macro) should be left > out of cl-lib, since this is a near-identical version of `cl-once-only' > with minor changes. Also understood.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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I seem to be a minority of > one, and won't bother starting any new thread about it. I don't know what the overall opinion is, but I do not necessarily disagree with you that cl-lib should be for (and only for) emulating Common Lisp. While I do not know the scope and extent of the changes you want to make, I support moving with-gensyms and once-only (and consequently this) out of cl-lib. However I simply do not have the energy to start (more) arguments and try to convince people to make this change. > I have no objection to using prefix cl-- (internal prefix) for utility > functions & macros in the library - i.e., for plumbing needed to > support the actual emulation. When talking about this patch in a vacuum, I am vehemently opposed to using the `cl--' prefix - this macro is a public-facing one, and making it internal is a guaranteed way to make sure no one uses it. It also does not make sense that this macro (and only this macro) should be left out of cl-lib, since this is a near-identical version of `cl-once-only' with minor changes.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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I've said all I have to say on the matter. I seem to be a minority of one, and won't bother starting any new thread about it. I will however, repeat it here, for the record. We've deviated from prefix cl- being only for emulations of Common Lisp constructs. At first just a little, but more and more over time. I really don't see the point of that. And I've never heard any good reason for it. I understand that cl- is a library prefix, so the functions etc. defined there should take the library prefix. What I object to is adding non-internal constructs to this library that aren't part of Common Lisp (and are generally not even related). I have no objection to using prefix cl-- (internal prefix) for utility functions & macros in the library - i.e., for plumbing needed to support the actual emulation. Since the point of the library is (used to be, at least) ONLY to emulate CL constructs, I think cl- should be reserved for those constructs, and anything else in it should use cl--. Yes, that would mean moving un-CL functions etc. out of the library, to somewhere else. And yes, that would mean replacing their cl- prefix with whatever prefix is right for their new location. And enforce the rule thereafter that you don't get to add wonderful-whatever-function to the library and give it prefix cl-.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Thuna <thuna.cing@HIDDEN>
To: Sean Whitton <spwhitton@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
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--=-=-=
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>> If `cl-once-only-multiple' is fine by you then I would prefer that over
>> `cl-once-only-rest' and `cl-once-only-mult'. It would help to get more
>> suggestions, but I don't think anyone else will be chiming in at this
>> point.
>
> It's just really long :)
I do agree that it's decently long, but it's probably fine...?
`cl-destructuring-bind' is the same length and I don't find that too
annoying to write out, though maybe that's just me.
> Let's give ourselves time to think of something shorter.
I don't have any new ideas for the name, but here's a second draft which
tries to adapt the example used in `cl-once-only'. I was unable to get
the `mapcar' in the first example any more concise, so some thoughts on
rewording and fixing various parts of the text would be nice.
If Drew wants to start a new conversation to move `cl-once-only' (and
also this) out of cl-lib we can also just go with any name now and then
finalize it afterwards, though of all the names the one I favor is still
`cl-once-only-multiple' above all others (sans `cl-once-only*' which is
not an option - unless if you changed your mind about it?).
--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline; filename=cl-texi-second-draft.patch
diff --git a/doc/misc/cl.texi b/doc/misc/cl.texi
index 57e2f3a6c3b..de9f0565d03 100644
--- a/doc/misc/cl.texi
+++ b/doc/misc/cl.texi
@@ -2684,10 +2684,10 @@ Macro-Writing Macros
@end defmac
@defmac cl-once-only* (variable forms) body
-This macro is a version of @code{cl-once-only} which takes a list of
-forms. This macro is primarily meant to be used where the number of
-forms is unknown and thus @code{cl-once-only} cannot work, such as those
-obtained by a @code{&body} argument.
+This macro is a version of @code{cl-once-only} which takes an
+arbitrarily long list of forms. This macro is primarily meant to be
+used where the number of forms is unknown and thus @code{cl-once-only}
+cannot work, such as those obtained by a @code{&body} argument.
Each element of @var{variable} may be used to refer to the result of
evaluating the corresponding form in @var{forms} within @var{body}.
@@ -2696,38 +2696,58 @@ Macro-Writing Macros
such that each form is evaluated in order and its result is bound to the
corresponding symbol.
-Like @code{cl-once-only}, the first argument can be a symbol
-@var{variable}, which is equivalent to writing @code{(variable
-variable)}.
+Like @code{cl-once-only}, the first argument can be a symbol @var{variable}, which
+is equivalent to writing @code{(variable variable)}.
Consider the following macro:
@example
-(defmacro my-list (head &rest args)
- (cl-once-only ((args `(list ,@@args))
- `(list (apply #',head ,args)
- ,args
- (nth 1 ,args))))
+(defmacro my-list (vals &rest forms)
+ (let ((val-results (mapcar (lambda (_) (gensym)) vals)))
+ `(let* ,(cl-mapcar #'list val-results vals)
+ (list ,(cl-first val-results)
+ ,(cl-second val-results)
+ ,@@val-results
+ (progn ,@@forms)))))
@end example
-This macro is such that it will evaluate @var{args} only once, however
-that @var{args} was a list is lost once we are in @code{cl-once-only}.
-Furthermore, to access any specific element of @var{args} we must obtain
-the element during evaluation via @code{(nth N ,args)}.
+In a call like @code{(my-list ((pop foo) (cl-incf bar) ...) ...)} the
+@code{pop} and @code{cl-incf} will be evaluated exactly once, ensuring
+their side effects are not applied twice. This code is however very
+complex, in the same way code not using @code{cl-once-only} is.
-Consider the alternative using @code{cl-once-only*}:
+Using @code{cl-once-only} is not possible directly due to it expecting
+individual forms which can be evaluated. This can be worked around by
+assigning to a variable @code{`(list ,@@vars)} which @emph{can} be
+evaluated:
@example
-(defmacro my-list (head &rest args)
- (cl-once-only* args
- `(list (,head ,@@args)
- (list ,@@args)
- ,(nth 1 args))))
+(defmacro my-list (vals &rest forms)
+ (cl-once-only ((vals `(list ,@@vals)))
+ `(list (cl-first ,vals)
+ (cl-second ,vals)
+ ,vals ; Does not splice
+ (progn ,@@forms))))
+@end example
+
+There are two problems which both result from the fact that @code{vals}
+is not a list inside the body of @code{cl-once-only}: 1. @code{vals}
+cannot be spliced in the way it can in the previous example and
+2. accessing individual elements of @code{vals} can only be done by
+accessing the resulting list @emph{during evaluation}. Compare this to
+the example using @code{cl-once-only*}:
+
+@example
+(defmacro my-list (vals &rest forms)
+ (cl-once-only* vals
+ `(list ,(cl-first vals)
+ ,(cl-second vals)
+ ,@@vals
+ (progn ,@@forms))))
@end example
-which preserves the fact that @var{args} is a list and allows immediate
-access to individual arguments by simply choosing the corresponding
-element in @var{args}.
+which preserves the fact the @var{vals} is a list and removes
+boiler-plate code for generating and assigning temporary variables.
@end defmac
@node Macros
--=-=-=--
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 9 Aug 2024 05:45:15 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Aug 09 01:45:15 2024 Received: from localhost ([127.0.0.1]:37524 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1scIR9-00046e-7k for submit <at> debbugs.gnu.org; Fri, 09 Aug 2024 01:45:15 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:33786) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1scIR6-00046R-K8 for 72344 <at> debbugs.gnu.org; Fri, 09 Aug 2024 01:45:13 -0400 DKIM-Signature: a=rsa-sha256; b=ZymhelagQS5n5p7ay8aUY6eOnOXikNaj6MdVdBukUvCH6fpPWzr1eAc1xpwoGghbF8SlpTrN7NF76yqEJ20dZoBT6bYE31dAvAl6rH9sJzCGkSM4W2j7fLj2j4o7N4UmkrQGotnYIyrQHGMAo0qRHvG1Mk4r6tigvPTLiuRdhMuXH8bwnYJtp4S6nYADf+Nz8Dk/erASfghaUzDyEuZC+4HhvrQ15cx655v7cWTJ/zUMGHbYVHsC7b6k7Y/7FOx1Rb5YqXuEkQAtSY52SfwxX3fTtfTLBUNM4MxTLlJMhVL5A68IiT6B7no3PIRVlrFG16fWuCf0yQFimQKfkeUNZg==; s=purelymail3; d=spwhitton.name; v=1; bh=s7LUBeFpR6l8E8p9c+SBGcyqlgLTPI5M0bMbNny4IiE=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=MLCTJ3vtPvyfMO6fegkFOrIRy67xD6Uczs0E6S1uzfYM1i341Psz3oz2rNuAPjus2ZIXap0nQybnH8iT1rRKgiRTKO2RCGono/IkQ8uCcoOvzveCFsMb3BJtB9qfBz43s4G1wed1wVJ35Dujep9LeH4euJ+m68xsPcM/sYD3jRZQJuweOeVVm9E/DArhmhrrI1MHXQGMQhGmVXBtY4GeuXc7tWN9RMKsqubgcrxJQ1geHhsafFBxi1Qn2neudMuQ4YOf0GvdHYi7TnpCYnc/ZAGnBcIsGP/pQqN2eMWAU+aeug8n48qUL6PGNN5vj3MVGxjW1CIVLn2XxYR5bkUl/w==; s=purelymail3; d=purelymail.com; v=1; bh=s7LUBeFpR6l8E8p9c+SBGcyqlgLTPI5M0bMbNny4IiE=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id 1119003421; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Fri, 09 Aug 2024 05:44:36 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id DD5CB7E7FD1; Fri, 9 Aug 2024 14:44:32 +0900 (KST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <87wmkuzak2.fsf@HIDDEN> (Sean Whitton's message of "Tue, 06 Aug 2024 09:47:57 +0800") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <87wmkuzak2.fsf@HIDDEN> Date: Fri, 09 Aug 2024 13:44:32 +0800 Message-ID: <87ikwal073.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello Thuna, cl-once-only-many cl-once-only-these ? -- Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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None of the constructs mentioned correspond to actual Common Lisp constructs.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 6 Aug 2024 12:38:10 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Aug 06 08:38:10 2024 Received: from localhost ([127.0.0.1]:60387 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sbJS6-0003V9-FE for submit <at> debbugs.gnu.org; Tue, 06 Aug 2024 08:38:10 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:57764) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1sbJS4-0003Us-Dv for 72344 <at> debbugs.gnu.org; Tue, 06 Aug 2024 08:38:09 -0400 DKIM-Signature: a=rsa-sha256; b=HJX97oNcGYykTCKdynQpNDdRWcAbCUcefeganN99GclcRzH28zHrJW12GOUe8qQLHdqrZmR9RW/fL1oramEY2nCLrlG2oRWpMmrS6h+V9Rc7dc+ZcYLs4XNXswPFcUzL9Datbj8GnLqIjajmiMfOVfqjnnbQ9Y9MsuxyJcM3lDWMQtr118+u0IP7/HsD+MiWPkOjzQ7fxmkczfYFPBxp/sC178Nqo3xTbOFv6sC3PadNNyxH9bpFs+Z7P4Ux8/72P4SOmVh0wsck2DDF47G3zosAd8GUP4jiU4g0K9nRw9x88u3UkWzvOVDsD+ITyAFARo8jA0mTuIwztz0gn1aFqA==; s=purelymail3; d=spwhitton.name; v=1; bh=oz2tIZ7KGHmxV/jx0tHf93sKqKxooUE9VoGAUwpEzBU=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=dPfJRr72EGjtPjQeViRtj2R9bu8Um/qe/Z2XrgsTGc4KJaYKxtVY+EJQUFuB6Uqs20uCt+1Td/+asLCCom1CK4xbtZjYp85LjQeQ7qQzMiytStvVa39LeA5Y675+mq+KJJUvUGyxkDBkgYY6Ux/5PvL3CkUnyOPnkkePeQliiFKhV1F7sqv+bSpRksl2l0YgewGT/xkwtrXM83nVIuuM3g28dXQYLrKSvVqBf+eCj+n154CbMNOBWJtBKbSN4K1grNDkc9QTeMK9L+L7d+8h3jlkFvLdMI6PMrQgq1q6XfR5mWOaGFrBQfO15BM2APi6gPUfCcGpbx+Jog51erJp1A==; s=purelymail3; d=purelymail.com; v=1; bh=oz2tIZ7KGHmxV/jx0tHf93sKqKxooUE9VoGAUwpEzBU=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id 195583735; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Tue, 06 Aug 2024 12:37:32 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id 2B1537E77B3; Tue, 6 Aug 2024 21:37:30 +0900 (KST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <874j7xzvgx.fsf@HIDDEN> (Thuna's message of "Tue, 06 Aug 2024 14:28:30 +0200") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> <874j7xzvgx.fsf@HIDDEN> Date: Tue, 06 Aug 2024 20:37:30 +0800 Message-ID: <87r0b1su7p.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello, On Tue 06 Aug 2024 at 02:28pm +02, Thuna wrote: > If `cl-once-only-multiple' is fine by you then I would prefer that over > `cl-once-only-rest' and `cl-once-only-mult'. It would help to get more > suggestions, but I don't think anyone else will be chiming in at this > point. It's just really long :) Let's give ourselves time to think of something shorter. -- Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 6 Aug 2024 12:30:05 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Aug 06 08:30:05 2024 Received: from localhost ([127.0.0.1]:60380 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sbJKH-0003Eh-FZ for submit <at> debbugs.gnu.org; Tue, 06 Aug 2024 08:30:05 -0400 Received: from mail-wr1-f43.google.com ([209.85.221.43]:54709) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <thuna.cing@HIDDEN>) id 1sbJKF-0003Dn-6E for 72344 <at> debbugs.gnu.org; Tue, 06 Aug 2024 08:30:04 -0400 Received: by mail-wr1-f43.google.com with SMTP id ffacd0b85a97d-3683178b226so304717f8f.1 for <72344 <at> debbugs.gnu.org>; Tue, 06 Aug 2024 05:29:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1722947313; x=1723552113; darn=debbugs.gnu.org; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=bqPIQ6+voRJZuqqo0Ns73MvjYOhaSe1Ao3X109B7hKs=; b=S5Eg+fWyPznMGWZ95obido2FyhcDdZi9eUf4C2pLRTptu/uNlwcyseRa//Mtyc2Dwp Pc7TtiOmOM7DMNnrEpKZCeXkkP6ImyeoUbOKwB0vaNUuqE9dbnGDe1I1cQGoBCTG1AWo gHSOVxSH+ZG64BG3e6kCci+1kuJrdhOJR3C5MfyA4G8oqmA7SAbjAh5SQxLJ+oCUKESW G9TlzLS19jtv22JeHYzgO1yCu6JUxn6QZeHQjpBOOrgN6T6MIglNOJdFn1EjjAK5BFNh DWlbLt0kh0k0zwObA2EzPjrTfp67/6Sj14KMJ0UYTxAog2y7hXxKyFm16b/njklylESN Hujg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722947313; x=1723552113; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bqPIQ6+voRJZuqqo0Ns73MvjYOhaSe1Ao3X109B7hKs=; b=XpO2UqDsGt2P+J2G82RGyD3nZPK7uPVaTB4iDqpHfnRYGFAFHKmKo5Nk8t9d+a1TDi 1utDCp1+ws0jmwpTQFvhkdQkNE/g1S27vPyQpJxtoo3mtipdGaPTZ1z3jJ0MiJBmdGsL F3LQkO0KieiGeHUes2vFG7qF5peRObMYVoxpcVKy+HFVQ6lLvftB8XbgkuNTip/NoivT iYgv4KZ91kZ66UHPu1qaKljAORBlruWS33tHxw6pWdY9+XFDZqXLwJfLGg7GhWP+Wk8P 8lNHu+X5r+2kTOYziJLXLHlHeiRHNqdxKLERyMo4fJUIWqA8Klee5/t5QaYX/OMIYwop 6aNQ== X-Gm-Message-State: AOJu0YzuONgHpbl2MopqQQeAuimx/3fEPiPzYqcRbd+nUC7rRNdRcMAd Lcvtypjn069yxgjp2SH6DflJlt+WhNOGf/6Gvw9LvQyk3IYEKOMMduRQ1A== X-Google-Smtp-Source: AGHT+IEvz0cXeJilwebh3Hgx4jpZC+cK6qo9v2vcFk4aKr7JdydDvRcNVvVZdt3JYKseMR3tWgHbcw== X-Received: by 2002:adf:e98a:0:b0:368:4d33:9aac with SMTP id ffacd0b85a97d-36bbc0fc757mr8456282f8f.31.1722947312804; Tue, 06 Aug 2024 05:28:32 -0700 (PDT) Received: from thuna-lis3 ([85.106.105.81]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36bbd02a451sm13038952f8f.63.2024.08.06.05.28.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Aug 2024 05:28:32 -0700 (PDT) From: Thuna <thuna.cing@HIDDEN> To: Sean Whitton <spwhitton@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <871q321l7d.fsf@HIDDEN> References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> Date: Tue, 06 Aug 2024 14:28:30 +0200 Message-ID: <874j7xzvgx.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) > Looks good. I wonder if it might be easier to read if you could somehow > extend the example I used for cl-once-only ? I'll look into it, though the whole thing really needs a do-over, and I am not sure if I am the right person for that. I'll whip up another draft in a day or so and we can see how that looks. >> (Do we want a NEWS entry also?) > > Yes, probably appropriate. What about something like this? +++ *** New macro `cl-once-only*'. This macro is a version of `cl-once-only' which takes a list of forms. This can be used when there are an arbitrary number of arguments which need to be evaluated exactly once. Also, I put it under "Lisp Changes in Emacs" but is that right? >>> cl-seq-once-only ? >> >> How about `cl-once-only-multiple'? The name should probably be of the >> form `cl-once-only<something>', rather than `cl-<something>-once-only' I >> think. > > There are already several cl-multiple-... so maybe cl-once-only-mult ? > cl-once-only-multiple is fine with me, though. > > cl-once-only-rest, as a reference to &rest ? If `cl-once-only-multiple' is fine by you then I would prefer that over `cl-once-only-rest' and `cl-once-only-mult'. It would help to get more suggestions, but I don't think anyone else will be chiming in at this point.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 6 Aug 2024 01:48:35 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Aug 05 21:48:35 2024 Received: from localhost ([127.0.0.1]:59624 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sb9JT-0006NR-JL for submit <at> debbugs.gnu.org; Mon, 05 Aug 2024 21:48:35 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:58486) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1sb9JQ-0006NB-SV for 72344 <at> debbugs.gnu.org; Mon, 05 Aug 2024 21:48:33 -0400 DKIM-Signature: a=rsa-sha256; b=JW4GLHJns66jV0fqUUCPuRnMJ/h9xqz/jyjiawcVXZNVeWHgX5VL9pVNSrOgYCGm1qa49nVOW5PdiExuwJ7kLIdKuyGXZC3v9Noqqr4HWUYb/Ow/+WBF51vaVpvqn5KBq/qQ4ajQtlB+IPFTD8ZIWF79s0a51OdfWOhvPrCHeEJyaiUQFh5OCNlQqoaRsfVUEPJtw60TPoqhCjG9Gl8K0wJX2Gbbl3HobW/gNsAxaK561+t1SEoV9EpRn9ctsuW7RHCbPx0ggP2MoaRjHSiFjPSsKDQOtH5lqd4ZyRftxz4/k0VZNvFBsizXwBQT5lqTFnd0XEn+79Jzarak0nHG1w==; s=purelymail3; d=spwhitton.name; v=1; bh=CbVpVqZqvPWsvWkS0j+6UMoEpaU7X9eUFTBnx/HTe64=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=WLSzsVRDhh3xe8iLFnggEWcgXLJvltzGGbJvAVZyWneE6Gydhs1OveAJwlAhL7bpI0E+bO9CSMmjQT0DVWw8vhdEsZ1Ydam3kNten7zjyRB5QJtGusUzXzPo5m0mR59viyzB/ImEV90iD6HplSbyiBvMwa0l6/yy1uRQJoLPuCJ9g6AUOVx+94JmzyVZYunWBho9aat8UUFvxC4r0luQXBfwMVDdRSlsHQbhaDj3PaECNuLLcHIVG9YEOod0fmx2r6wJhRGpFC092/3xSMVeAYQB8j3toXIQbW2qf291D9Qfa1nwienKkFjnOjS19PsMPhhRC9l0dYEKFLjNzcC9ww==; s=purelymail3; d=purelymail.com; v=1; bh=CbVpVqZqvPWsvWkS0j+6UMoEpaU7X9eUFTBnx/HTe64=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id 1467900547; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Tue, 06 Aug 2024 01:48:01 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id 8BC517E5B96; Tue, 6 Aug 2024 10:47:57 +0900 (KST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <871q321l7d.fsf@HIDDEN> (Sean Whitton's message of "Tue, 06 Aug 2024 09:41:58 +0800") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> <871q321l7d.fsf@HIDDEN> Date: Tue, 06 Aug 2024 09:47:57 +0800 Message-ID: <87wmkuzak2.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello, On Tue 06 Aug 2024 at 09:41am +08, Sean Whitton wrote: > There are already several cl-multiple-... so maybe cl-once-only-mult ? > cl-once-only-multiple is fine with me, though. cl-once-only-rest, as a reference to &rest ? -- Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 6 Aug 2024 01:42:36 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Aug 05 21:42:36 2024 Received: from localhost ([127.0.0.1]:59618 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sb9Df-0006Ae-NV for submit <at> debbugs.gnu.org; Mon, 05 Aug 2024 21:42:36 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:57696) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1sb9Dd-0006AM-8M for 72344 <at> debbugs.gnu.org; Mon, 05 Aug 2024 21:42:34 -0400 DKIM-Signature: a=rsa-sha256; b=D1APaRvg/F/tYVI4ijlW1Igh7WTJmzMCh8uusE103czSwA6z8eA4f8T+64IasuF0H5RSJZefk0C81eCzTNRMt1H8lNwqCRqYsxJEGJuS/1B0hiTEBcWGDvxfaDHYhTra5y/vT1h0h90jQ9V5Eypc+b4kJcV6KVHmwuJQP6FRtMKvwmOdQmYk6QB1lP6C2iIPi4BPxWXouYdUVWnG0PoufQueNxm6HixJhN1gq0zVRlLLvjMMj8QdEkoHu8qST4pi4aiabAn66tMFk1LZHrQyZS+K8mXhqg57TEhNGkFEe30bjyOORBo8IL/Lr1A/kBOrqTsMclBuzjP4FisU1w7xWg==; s=purelymail3; d=spwhitton.name; v=1; bh=FSiWdToayv4nDtg+i7rHv5SWyF4aYOkMWwe5ptOhVgQ=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=LmOg827TptGDN9ePlxfAPkR/5UvvsnjTWElnnhdHhKkplAI0uEpP6k4hiToaYF2TFv4t6penC7t3YC36/xSwfNWV/FYlvjA7Y+3WbkPG8b8RABZ2SpyxZItWnL/89MKos8dtIlM5tPyccdzCYIpU3FPcFiYZziiFLIAm2WtjM47WmUQIf/DLnFwi93zFYYYDovBjt87B9BuXkCQe5oT+CZzLf/i+6XlN4W48jgqpkpW1r5Wg9T5OwUgg5Ig12IUt+tdNr6fvc5/Me27QRlI8v3nUiRh0aO0GhesJG65I+UTwEu6UjDFPvsc8AWvsOG7SPYiV3Mp6Z9VrmpCwZ4Ei7g==; s=purelymail3; d=purelymail.com; v=1; bh=FSiWdToayv4nDtg+i7rHv5SWyF4aYOkMWwe5ptOhVgQ=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id -1554353320; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Tue, 06 Aug 2024 01:42:01 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id 24BF67E4C3F; Tue, 6 Aug 2024 10:41:58 +0900 (KST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <871q35mdrd.fsf@HIDDEN> (Thuna's message of "Sun, 04 Aug 2024 00:40:22 +0200") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> <87ikwi5neo.fsf@HIDDEN> <871q35mdrd.fsf@HIDDEN> Date: Tue, 06 Aug 2024 09:41:58 +0800 Message-ID: <871q321l7d.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello, On Sun 04 Aug 2024 at 12:40am +02, Thuna wrote: > I've written a draft for what it could look like. It needs proofreading > and editing, but it should be a fine-ish place to start from at least. > It uses `cl-once-only*' as the name of the macro but that's just a > placeholder for now. Looks good. I wonder if it might be easier to read if you could somehow extend the example I used for cl-once-only ? > (Do we want a NEWS entry also?) Yes, probably appropriate. > I've also made it so that the first argument can either be of the form > (VARIABLE FORMS) or VARIABLE - how it worked before - which stands for > (VARIABLE VARIABLE), so as to keep parity with `cl-once-only'. Nice. >> I think we should reserve the starred name for now. As you said, your >> macro doesn't come up often, and we might later come up with a variant >> of cl-once-only that we want to use very often. > > I see that point, and it is completely fair. I have no problem > conceding the starred name. Cool. >> cl-seq-once-only ? > > How about `cl-once-only-multiple'? The name should probably be of the > form `cl-once-only<something>', rather than `cl-<something>-once-only' I > think. There are already several cl-multiple-... so maybe cl-once-only-mult ? cl-once-only-multiple is fine with me, though. -- Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Thuna <thuna.cing@HIDDEN>
To: Sean Whitton <spwhitton@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
In-Reply-To: <87ikwi5neo.fsf@HIDDEN>
References: <87y15l1aj8.fsf@HIDDEN>
<8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN>
<87ikwi5neo.fsf@HIDDEN>
Date: Sun, 04 Aug 2024 00:40:22 +0200
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> Thanks. If you have indeed been coming across this in practice, then it
> seems worth adding a macro like this.
>
> Btw, I think we would want to see an update to cl.texi along with your
> change.
I've written a draft for what it could look like. It needs proofreading
and editing, but it should be a fine-ish place to start from at least.
It uses `cl-once-only*' as the name of the macro but that's just a
placeholder for now. (Do we want a NEWS entry also?)
I've also made it so that the first argument can either be of the form
(VARIABLE FORMS) or VARIABLE - how it worked before - which stands for
(VARIABLE VARIABLE), so as to keep parity with `cl-once-only'.
I've attached the change to cl.texi and the full implementation of
`cl-once-only*' as a single patch.
>> I don't necessarily think that that name is bad but it doesn't quite get
>> to the heart of the macro either.
>>
>> The macro is meant to be a `cl-once-only' which works on a list of
>> forms, and I feel that the "of forms" part is more important than the
>> "list" part, which is conceptually more likely to take on a meaning of
>> some ambiguous "collection" rather than a chain of cons cells.
>
> I think we should reserve the starred name for now. As you said, your
> macro doesn't come up often, and we might later come up with a variant
> of cl-once-only that we want to use very often.
I see that point, and it is completely fair. I have no problem
conceding the starred name.
> cl-seq-once-only ?
How about `cl-once-only-multiple'? The name should probably be of the
form `cl-once-only<something>', rather than `cl-<something>-once-only' I
think.
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
filename=0001-Add-a-version-of-cl-once-only-which-works-on-a-list-.patch
From 18f72562f888d0abe56601544b23358429b7afcd Mon Sep 17 00:00:00 2001
From: Thuna <thuna.cing@HIDDEN>
Date: Sun, 4 Aug 2024 00:30:44 +0200
Subject: [PATCH] Add a version of cl-once-only which works on a list of forms
---
doc/misc/cl.texi | 49 +++++++++++++++++++++++++++++++++++++-
lisp/emacs-lisp/cl-macs.el | 48 +++++++++++++++++++++++++++++++++++++
2 files changed, 96 insertions(+), 1 deletion(-)
diff --git a/doc/misc/cl.texi b/doc/misc/cl.texi
index 113029700ec..57e2f3a6c3b 100644
--- a/doc/misc/cl.texi
+++ b/doc/misc/cl.texi
@@ -999,7 +999,7 @@ Control Structure
* Iteration:: @code{cl-do}, @code{cl-dotimes}, @code{cl-dolist}, @code{cl-do-symbols}.
* Loop Facility:: The Common Lisp @code{loop} macro.
* Multiple Values:: @code{cl-values}, @code{cl-multiple-value-bind}, etc.
-* Macro-Writing Macros:: @code{cl-with-gensyms}, @code{cl-once-only}.
+* Macro-Writing Macros:: @code{cl-with-gensyms}, @code{cl-once-only}, @code{cl-once-only*}.
@end menu
@node Assignment
@@ -2683,6 +2683,53 @@ Macro-Writing Macros
@end example
@end defmac
+@defmac cl-once-only* (variable forms) body
+This macro is a version of @code{cl-once-only} which takes a list of
+forms. This macro is primarily meant to be used where the number of
+forms is unknown and thus @code{cl-once-only} cannot work, such as those
+obtained by a @code{&body} argument.
+
+Each element of @var{variable} may be used to refer to the result of
+evaluating the corresponding form in @var{forms} within @var{body}.
+@code{cl-once-only*} binds @var{variable} to a list of fresh uninterned
+symbols. @code{cl-once-only*} furthermore wraps the final expansion
+such that each form is evaluated in order and its result is bound to the
+corresponding symbol.
+
+Like @code{cl-once-only}, the first argument can be a symbol
+@var{variable}, which is equivalent to writing @code{(variable
+variable)}.
+
+Consider the following macro:
+
+@example
+(defmacro my-list (head &rest args)
+ (cl-once-only ((args `(list ,@@args))
+ `(list (apply #',head ,args)
+ ,args
+ (nth 1 ,args))))
+@end example
+
+This macro is such that it will evaluate @var{args} only once, however
+that @var{args} was a list is lost once we are in @code{cl-once-only}.
+Furthermore, to access any specific element of @var{args} we must obtain
+the element during evaluation via @code{(nth N ,args)}.
+
+Consider the alternative using @code{cl-once-only*}:
+
+@example
+(defmacro my-list (head &rest args)
+ (cl-once-only* args
+ `(list (,head ,@@args)
+ (list ,@@args)
+ ,(nth 1 args))))
+@end example
+
+which preserves the fact that @var{args} is a list and allows immediate
+access to individual arguments by simply choosing the corresponding
+element in @var{args}.
+@end defmac
+
@node Macros
@chapter Macros
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 2e501005bf7..adb9cb29104 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -2544,6 +2544,54 @@ cl-once-only
collect `(,(car name) ,gensym))
,@body)))))
+(defmacro cl-once-only* (listvar &rest body)
+ "Generate code to evaluate the list of FORMS just once in BODY.
+
+This is a macro to be used while defining other macros. FORMS is
+evaluated once during macroexpansion to obtain the list of forms. In
+the fully expanded code those forms will be evaluated once before BODY
+and their results will be bound to fresh uninterned variables, one for
+each form.
+
+Within the macro VARIABLE is a list of these symbols in order, such that
+each form in FORMS can be accessed by using the corresponding element in
+VARIABLE.
+
+The common case of `(cl-once-only* (VARIABLE VARIABLE) ...)' can be
+written shortly as `(cl-once-only* VARIABLE ...)'.
+
+For example, the following macro:
+
+ (defmacro my-list (head &rest args)
+ (cl-once-only* args
+ \\=`(list (,head ,@args) ,@args)))
+
+when called like
+
+ (let ((x \\='(1 5 4)))
+ (my-list + (pop x) (1+ (pop x)) (1- (pop x))))
+
+will expand into
+
+ (let ((x \\='(1 5 4)))
+ (let* ((arg1 (pop x)) (arg2 (1+ (pop x))) (arg3 (1- (pop x))))
+ (list (+ arg1 arg2 arg3) arg1 arg2 arg3)))
+
+and the arguments will be evaluated only once and in order.
+
+\(fn (VARIABLE FORMS) &body BODY)"
+ (declare (debug ([&or symbolp (symbolp form)] body)) (indent 1))
+ (let* ((variable (if (symbolp listvar) listvar (nth 0 listvar)))
+ (forms (if (symbolp listvar) listvar (nth 1 listvar)))
+ (results* (gensym (symbol-name variable))))
+ (cl-once-only (forms)
+ `(let ((,results*
+ (cl-loop for i from 1 to (length ,forms) collect
+ (make-symbol (format "%s$%d" ',(symbol-name variable) i)))))
+ `(let* ,(cl-mapcar #'list ,results* ,forms)
+ ,(let ((,variable ,results*))
+ ,@body))))))
+
;;; Multiple values.
;;;###autoload
--
2.44.2
--=-=-=--
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 3 Aug 2024 02:52:21 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Aug 02 22:52:21 2024 Received: from localhost ([127.0.0.1]:53935 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sa4sX-0005FL-AH for submit <at> debbugs.gnu.org; Fri, 02 Aug 2024 22:52:21 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:60428) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1sa4sU-0005F3-9A for 72344 <at> debbugs.gnu.org; Fri, 02 Aug 2024 22:52:19 -0400 DKIM-Signature: a=rsa-sha256; b=dFVs3kAgsB19uxdw/PMmIdhlnK0MpfRfCn99itFEr56yCLD5fxEQHyE/W7bJYmYTyoIwXhkTEx5BsW3VdhlucKuaYLzfOjEMGeeu/Mp0M7AqBXK7jWnJcGBTldRpbfQE6UECx8nQtzJ70w9pxMOIByxdRT6oyfMDO0IfnG/6Cxvo1tnagKHJMmLFG1SxikV5E6DqZqYg5QphmVBf007KELibwqemWmabdf9043ePi1OyZYooF5tyvrRlzx390FQBCjhtuY8XAf6o4C9Xlnfm/JCzSyA11LlGWJDYVCyTNRwsDUMgOx6cGWTi038RF4n/7ybRU1tTvDiFHFn94nokLA==; s=purelymail2; d=spwhitton.name; v=1; bh=MtDYlEbh6oBWphvajBjPaQvWjJ2l09E06fkoxypJ6Fk=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=oo4UKODeJbAUoK7gc4ixXpwyj6aOSQ02mxjPi0N2I0QYclQA7XHvfA0/07dZlctKy+V7dMKyD2xvHHcSyxmwi3SI2RYfsOlO06N09e12tkD/n08FATXJNEIhsE7YuRmb6RyjOVN7HFu7RPthEFp2ME3njjgoVXUYeEx1njoI7e9/D+InI4YDN5X6Ub0oELzbPwP4D8Kb3H6gUNh0wPSNkh4sPalaZOGjJEgHNDNRX1y0AK+omiwVt9MjCmzsdRB7YTBGOakk0iwF+p/FWU/Xbr6eL8v0tYrRfqxjyOdcUxuo3MpWy5CzjbpIziaNjulQWKQA567xzjRppg9klgLldA==; s=purelymail2; d=purelymail.com; v=1; bh=MtDYlEbh6oBWphvajBjPaQvWjJ2l09E06fkoxypJ6Fk=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id 797358454; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Sat, 03 Aug 2024 02:51:46 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id 32F767E0CF5; Sat, 3 Aug 2024 11:51:43 +0900 (KST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <87plqw0y9j.fsf@HIDDEN> (Thuna's message of "Mon, 29 Jul 2024 21:54:48 +0200") References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN> <87plqw0y9j.fsf@HIDDEN> Date: Sat, 03 Aug 2024 10:51:43 +0800 Message-ID: <87ikwi5neo.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello, On Mon 29 Jul 2024 at 09:54pm +02, Thuna wrote: > `cl-once-only*' is meant to work in situations where `cl-once-only' does > not, namely a situation where you do not know the number of forms to be > evaluated. > > While such a situation *could* exist without, the cases which benefit > from `cl-once-only*' are overwhelmingly likely to be of the > > (defmacro _ (control &rest args) > `(progn > (do-something-with-control ,@args) > (foo ,@args))) > > variety. The problem here is that the forms in ARGS will be evaluated > twice while we only want it to happen once. An alternative way to > achieve this would be to do > > (defmacro _ (control &rest args) > (cl-with-gensyms (argslist) > `(let ((,argslist (list ,@args))) > ...))) > > and either let-bind ARGS to ARGSLIST or only refer to ARGSLIST within > the body, keeping in mind that ARGSLIST is only a symbol during > macroexpansion and that in order to refer to individual arguments you > need to do (nth N ,ARGSLIST) such that the expanded code itself finds > the relevant argument among all the ones. > > With `cl-once-only*', ARGSLIST (or rather ARGS) is not a symbol but a > list of symbols so to refer to the individual argument you do ,(nth N > ARGS) and you can simply wrap your macro which worked (sans the double > evaluating) without the `cl-once-only*' and it should simply* work out of > the box. Thanks. If you have indeed been coming across this in practice, then it seems worth adding a macro like this. Btw, I think we would want to see an update to cl.texi along with your change. > I don't necessarily think that that name is bad but it doesn't quite get > to the heart of the macro either. > > The macro is meant to be a `cl-once-only' which works on a list of > forms, and I feel that the "of forms" part is more important than the > "list" part, which is conceptually more likely to take on a meaning of > some ambiguous "collection" rather than a chain of cons cells. I think we should reserve the starred name for now. As you said, your macro doesn't come up often, and we might later come up with a variant of cl-once-only that we want to use very often. cl-seq-once-only ? -- Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Thuna <thuna.cing@HIDDEN>
To: Sean Whitton <spwhitton@HIDDEN>
Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles
lists of forms
In-Reply-To: <8734nsk72i.fsf@HIDDEN>
References: <87y15l1aj8.fsf@HIDDEN> <8734nsk72i.fsf@HIDDEN>
Date: Mon, 29 Jul 2024 21:54:48 +0200
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> To be honest, cl-once-only* seems quite esoteric. Could you perhaps
> show me a direct comparison between some cl-once-only code and how it is
> made more readable by cl-once-only*? That seems to me to be the key
> criteria.
`cl-once-only*' is meant to work in situations where `cl-once-only' does
not, namely a situation where you do not know the number of forms to be
evaluated.
While such a situation *could* exist without, the cases which benefit
from `cl-once-only*' are overwhelmingly likely to be of the
(defmacro _ (control &rest args)
`(progn
(do-something-with-control ,@args)
(foo ,@args)))
variety. The problem here is that the forms in ARGS will be evaluated
twice while we only want it to happen once. An alternative way to
achieve this would be to do
(defmacro _ (control &rest args)
(cl-with-gensyms (argslist)
`(let ((,argslist (list ,@args)))
...)))
and either let-bind ARGS to ARGSLIST or only refer to ARGSLIST within
the body, keeping in mind that ARGSLIST is only a symbol during
macroexpansion and that in order to refer to individual arguments you
need to do (nth N ,ARGSLIST) such that the expanded code itself finds
the relevant argument among all the ones.
With `cl-once-only*', ARGSLIST (or rather ARGS) is not a symbol but a
list of symbols so to refer to the individual argument you do ,(nth N
ARGS) and you can simply wrap your macro which worked (sans the double
evaluating) without the `cl-once-only*' and it should simply* work out of
the box.
(* There is a problem with, say, checking `macroexp-const-p' on the
given arguments, but that is not something that is too difficult to
correct, within reason, and `cl-once-only' doesn't do it either so I
don't think it matters too much.)
> Also, I wonder if a name like cl-list-once-only would be better.
I don't necessarily think that that name is bad but it doesn't quite get
to the heart of the macro either.
The macro is meant to be a `cl-once-only' which works on a list of
forms, and I feel that the "of forms" part is more important than the
"list" part, which is conceptually more likely to take on a meaning of
some ambiguous "collection" rather than a chain of cons cells.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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Mon, 29 Jul 2024 19:54:17 +0000 From: Drew Adams <drew.adams@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: RE: [External] : bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms Thread-Topic: [External] : bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms Thread-Index: AQHa4e3AlxkPazB2UkqYPBrLTWpNAbIOGJjg Date: Mon, 29 Jul 2024 19:54:17 +0000 Message-ID: <SJ0PR10MB548835D2E62D95E503E3C702F3B72@HIDDEN> References: <87y15l1aj8.fsf@HIDDEN> <SJ0PR10MB5488E62CFB86E131962E3CAFF3B72@HIDDEN> <87sevs0zel.fsf@HIDDEN> In-Reply-To: <87sevs0zel.fsf@HIDDEN> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SJ0PR10MB5488:EE_|CY8PR10MB6803:EE_ x-ms-office365-filtering-correlation-id: 6b834b38-1fe8-4b47-afcd-08dcb0083b0b x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; ARA:13230040|366016|1800799024|376014|38070700018; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: XT0NStxTzv0zE6TDWegoJpq99zL5cXN6mATILlvHnXEXG9GNFAinHMr1Cf5EiyB03LBdela9qq/8U1Q78B4iFAvkqjIP9Lz6xvCfyv1Gj0zS80uzw2AJ5m9UPLpl9qXTzHB4v0OBoEi6Q86Rd8fkwWf+0aHqqSt/QjWozqFgOul7Jl5wV5WVdQwoWwb/NAv1CG5VAQ+vJaLcugoblLsA90HXWM/qvafZ+VQCUkSRLAr/eYKaCb12HtNBnftm22S3hN2pkbPgvmxNgLaJlIbs3ZucQoL6pzUUoR05uCu9xZwZb/GxcSnlBEi2vva7YFlMGPlFLqlPTCc/z8lWUwX4S9axwxM3uN1V1cLv7rF/k1380AUAOrvpNQqUAEE1rV2NG13V5iS9bhE3ZsUn0MX7mq02R5KB7gtk9aOL6G7ndvf4PAoEsG4x3CqiwTEMv8hjxAxfruZy7sPHObeGfjAjFgsq9b80kBt0twDJRdBTlFEVFgGl5E/daMOHtMu9FeZWe7dV9FYiupOmT1TwCZuZeIaFpOvi5Ue61/+vroVkB+XtaELfScmv/BJjT+mkS8ud5sOHhRzSp3y3q2+iZTLDUWAuRAVr9M7BJqG2tVzkonY= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ0PR10MB5488.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6b834b38-1fe8-4b47-afcd-08dcb0083b0b X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Jul 2024 19:54:17.6580 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9g/P0WQHxCLk6zbFa+etTrx5D0Uwx969eI2ST3t9qs9MCfo/SRRs6+U4WDAI6a3dZ2D2kmOMKEx9gRQC7SoJAA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR10MB6803 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-29_18,2024-07-26_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 malwarescore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2407110000 definitions=main-2407290134 X-Proofpoint-GUID: 9sN-9dTTAsm0f2qC6-jFz_eGQu26MFMT X-Proofpoint-ORIG-GUID: 9sN-9dTTAsm0f2qC6-jFz_eGQu26MFMT X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: "72344 <at> debbugs.gnu.org" <72344 <at> debbugs.gnu.org> 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: -1.0 (-) > > What does this have to do with Common Lisp or its > > emulation? >=20 > It is not about emulating Common Lisp, but it makes sense to keep this > next to `cl-once-only' as it is a variation of it. >=20 > > We shouldn't have _any_ functions, vars, macros, ... > > whose names use the prefix `cl-' (and not `cl--'). > > It's really unfortunate that we still do have some. >=20 > I assume you mean that the `cl-' prefix should only be for names which > exist in Common Lisp, and while I am sympathetic towards that opinion > `cl-once-only' and `cl-with-gensyms' are macros which are firmly(?) > embedded in cl-lib. Yes, my plaint is also for `cl-once-only' and the like. Firmly? Those were both just added by Someone(TM) in Emacs 29 - after _decades_ of Elisp CL emulation. The original direction/intent of that emulation is running down the drain - first a drip drip, then a trickle, soon a steady stream... Might as well use prefix `xl-' or `xxl-'. > The only other place where they would make sense, > as far as I am aware, is subr or subr-x, but I am not particularly > interested in making and defending the argument that they should be > moved there. As I said, it would be fine to use `cl--' as the prefix, indicating that it's in some sense "internal". In this case, at least in the sense that it doesn't emulate any CL construct. As I said, just one opinion. Those who don't care whether users can tell what's intended to emulate CL, and what's not, won't agree. What's not CL emulation is (1) just "plumbing" for some actual emulation or (2) unrelated stuff that Someone(TM) thought was clever to add. Too bad.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 29 Jul 2024 19:31:35 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Jul 29 15:31:35 2024 Received: from localhost ([127.0.0.1]:46385 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sYW5m-0004o7-PM for submit <at> debbugs.gnu.org; Mon, 29 Jul 2024 15:31:35 -0400 Received: from mail-lf1-f52.google.com ([209.85.167.52]:50555) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <thuna.cing@HIDDEN>) id 1sYW5k-0004nr-GD for 72344 <at> debbugs.gnu.org; Mon, 29 Jul 2024 15:31:33 -0400 Received: by mail-lf1-f52.google.com with SMTP id 2adb3069b0e04-52efbc57456so4095318e87.1 for <72344 <at> debbugs.gnu.org>; Mon, 29 Jul 2024 12:31:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1722281413; x=1722886213; darn=debbugs.gnu.org; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:from:to:cc:subject:date:message-id:reply-to; bh=7Rkw0O2J2LAALtCXduTb1B5CCiGrn8c+d3yhuIY+Lnw=; b=PWERWaaj0gbo5849BZhk2aDRRQcSfAr9dyM8JqTfm03mX/JjIHhgYcEcAcU2X86aS4 qRlehyUl6gvm01PLJ6EIszh0MQFCkhdP6ZzHkcn/D35MScxkUHL+13JoY9NxY4jYKTYj U1CzaUe15XW/pE2K1q8SwM04ErvkRbHljKilXxO4RrXGEi7B+JwkuawxKUbhosIqtZfu oDz8iW3GQvpgL6hNf+eDIY7Mr9lCieKv+16rqCX+LV/82VtAECr4tWcw40htU89OtNqa sLbVfg5Y3FJex3UZO+nKAtXbjZuChyzxQYR4gn3X0XPhsf0oXBNSqoyOi8i9kh2nT5RO ZSlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722281413; x=1722886213; h=mime-version:message-id:date:references:in-reply-to:subject:cc:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=7Rkw0O2J2LAALtCXduTb1B5CCiGrn8c+d3yhuIY+Lnw=; b=X87SHqYkifmX35TbwE5rODfY96RudzkBbFZAg2xYloAmKtbaMcZW09gqFYhY0GiGQ0 ngiuz6RNeyAAeP4Ft4SfruAKvtNLIJ+8V2RZmisTOveVweRNascyo22A0iIXwI7WCW4n FQEjtUULfEOV1AFouN5ZC0AC4owxB97Z08hObI3L7asYIKcLS1ngaIJnvp8tdn4mZuxm YBcgyhUVjYMvznY4mc4qiigQLG8lc+kflHUK9otZlsD2I2Q0a9fLdkTBCdJNNWntcPCC epDoFkzhRvdoTBqdsYJGdlgPSpie0672o7g4e1rGuE1Y2ZNhZc7hTC2ssynBK2MKJ9UL wSfA== X-Gm-Message-State: AOJu0YxSwkVnYQA3ABS7pqr5SySwao8UPzhlOL8h4sMoTexY9PReFUAO r5ZVB0mdxcssi9DBWxlygXS+BSwodbNnTf04R/RFhiVtC+qNGMKMxqeOVcIrRGI= X-Google-Smtp-Source: AGHT+IHtFLVKPj7o0pdbOb7oiPfeF8hZ64E22npESuHf65R3FGXZ9qGU/GC1Zjkw9WU+ubNAONEbwg== X-Received: by 2002:ac2:5f8b:0:b0:52c:def4:386b with SMTP id 2adb3069b0e04-5309b280a5dmr5453992e87.35.1722281412216; Mon, 29 Jul 2024 12:30:12 -0700 (PDT) Received: from thuna-lis3 ([85.106.105.81]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5b10e20dbb8sm3333308a12.49.2024.07.29.12.30.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jul 2024 12:30:11 -0700 (PDT) From: Thuna <thuna.cing@HIDDEN> To: Drew Adams <drew.adams@HIDDEN> Subject: RE: [External] : bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <SJ0PR10MB5488E62CFB86E131962E3CAFF3B72@HIDDEN> References: <87y15l1aj8.fsf@HIDDEN> <SJ0PR10MB5488E62CFB86E131962E3CAFF3B72@HIDDEN> Date: Mon, 29 Jul 2024 21:30:10 +0200 Message-ID: <87sevs0zel.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) > What does this have to do with Common Lisp or its > emulation? It is not about emulating Common Lisp, but it makes sense to keep this next to `cl-once-only' as it is a variation of it. > We shouldn't have _any_ functions, vars, macros, ... > whose names use the prefix `cl-' (and not `cl--'). > It's really unfortunate that we still do have some. I assume you mean that the `cl-' prefix should only be for names which exist in Common Lisp, and while I am sympathetic towards that opinion `cl-once-only' and `cl-with-gensyms' are macros which are firmly(?) embedded in cl-lib. The only other place where they would make sense, as far as I am aware, is subr or subr-x, but I am not particularly interested in making and defending the argument that they should be moved there.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.Received: (at 72344) by debbugs.gnu.org; 29 Jul 2024 07:10:08 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Jul 29 03:10:08 2024 Received: from localhost ([127.0.0.1]:44801 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sYKWF-0002eB-OA for submit <at> debbugs.gnu.org; Mon, 29 Jul 2024 03:10:08 -0400 Received: from sendmail.purelymail.com ([34.202.193.197]:40704) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <spwhitton@HIDDEN>) id 1sYKWD-0002dW-8t for 72344 <at> debbugs.gnu.org; Mon, 29 Jul 2024 03:10:06 -0400 DKIM-Signature: a=rsa-sha256; b=jnBBTz2f0QLE7TiqugJGkNDmLGBemmxzhnAl3Cs4djUO+2tqsj/39yq0RNoasb1YwCY2aYoqyHpDQwJzzfniTkD0d4dzcb7fLewJuw+2mzOGrwWoKsDmkOHzsdkHYwvLIuYDS9pV0tko5VKJ18r8pc480byrZpElsf0K2Q0mU6OPN4eFPI1U1BT+gD+BHwmYz8p2kcequrUsICavneYladjypCTrP8fupAM2EKWLbIECxGVz5ubBRiN3cgl7cPqbTnLyk4p2czXpeOyHlleoSNtt4sRgplHBB8el8BqLTxOoimmelqjXfkDcpQAvO06mJSRDir+WUMG5szDE9YblTQ==; s=purelymail1; d=spwhitton.name; v=1; bh=7bhm1DjlvqTfOi9SW4kZhjHF203lid7/QuJU0JvFDvQ=; h=Received:Received:From:To:Subject:Date; DKIM-Signature: a=rsa-sha256; b=pbuKcsvI8bzwq6w7Xf0h1LGTQZYbIueYujyE38q0jeAgckp5Obsz0XUzHJj/yuhSmTS++woRgFfnUAeM7zIBxsH3za6n0sfdHP5V4GCZiH5Ba2Z305dtvqyrByHb6pPqXhwAGWYSbIcjQtwZ8Z75n0e2S9ll/e9imOTc1VHq75lWLX7btx9+nsDC8h9AVEM0iZbmD6BRPbZWetJHHTNTNJmygQ6VzLMdFz0THB+DrWXSgTsvbZznoMTl2a3Aht9m9qmu96ZsVRCtz8k7ibRkfukxt4UmdwmYKOp/8D/zr9cp0zi+gRaknr20ihQIyVHEZGz6S05EbWn4Jqyi6CNE/Q==; s=purelymail1; d=purelymail.com; v=1; bh=7bhm1DjlvqTfOi9SW4kZhjHF203lid7/QuJU0JvFDvQ=; h=Feedback-ID:Received:Received:From:To:Subject:Date; Feedback-ID: 20115:3760:null:purelymail X-Pm-Original-To: 72344 <at> debbugs.gnu.org Received: by smtp.purelymail.com (Purelymail SMTP) with ESMTPSA id 259145025; (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Mon, 29 Jul 2024 07:09:44 +0000 (UTC) Received: by melete.silentflame.com (Postfix, from userid 1000) id 911E57EE8A9; Mon, 29 Jul 2024 16:09:41 +0900 (KST) From: Sean Whitton <spwhitton@HIDDEN> To: Thuna <thuna.cing@HIDDEN> Subject: Re: bug#72344: [PATCH] Add a version of cl-once-only which handles lists of forms In-Reply-To: <87y15l1aj8.fsf@HIDDEN> (Thuna's message of "Sun, 28 Jul 2024 23:17:31 +0200") References: <87y15l1aj8.fsf@HIDDEN> Date: Mon, 29 Jul 2024 16:09:41 +0900 Message-ID: <8734nsk72i.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 72344 Cc: 72344 <at> debbugs.gnu.org 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: -1.0 (-) Hello Thuna, On Sun 28 Jul 2024 at 11:17pm +02, Thuna wrote: > Attached is the macro `cl-once-only*', which takes a symbol which is > bound to a list of form (such as those contained in a `&rest args' in > `defmacro') and binds that variable to a list of symbols where each > symbol is bound to the result of evaluating (in order) the corresponding > form. The docstring provides an example which might illustrate what it > does better then I did here. > > I don't expect this to be used too often but it could be somewhat handy > in macros with a `&rest args' which are supposed to be evaluated. > > (My motivation for this is to use this macro in another patch which I > didn't want to make longer with out-of-scope additions. If this is > considered not worth polluting the `cl-' namespace over I can just write > the forms by hand so it's fine either way.) I'm the author of cl-once-only. I'm interested in macro-writing macros in the CL tradition. To be honest, cl-once-only* seems quite esoteric. Could you perhaps show me a direct comparison between some cl-once-only code and how it is made more readable by cl-once-only*? That seems to me to be the key criteria. Also, I wonder if a name like cl-list-once-only would be better. Thanks! -- Sean Whitton
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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The docstring provides an example which might illustrate what it > does better then I did here. >=20 > I don't expect this to be used too often but it could be somewhat handy > in macros with a `&rest args' which are supposed to be evaluated. >=20 > (My motivation for this is to use this macro in another patch which I > didn't want to make longer with out-of-scope additions. If this is > considered not worth polluting the `cl-' namespace over I can just write > the forms by hand so it's fine either way.) What does this have to do with Common Lisp or its emulation? We shouldn't have _any_ functions, vars, macros, ... whose names use the prefix `cl-' (and not `cl--'). It's really unfortunate that we still do have some. Using `cl--` (the internal prefix) isn't problematic, a priori. ___ Just one opinion.
bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
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From: Thuna <thuna.cing@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: [PATCH] Add a version of cl-once-only which handles lists of forms
Date: Sun, 28 Jul 2024 23:17:31 +0200
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Attached is the macro `cl-once-only*', which takes a symbol which is
bound to a list of form (such as those contained in a `&rest args' in
`defmacro') and binds that variable to a list of symbols where each
symbol is bound to the result of evaluating (in order) the corresponding
form. The docstring provides an example which might illustrate what it
does better then I did here.
I don't expect this to be used too often but it could be somewhat handy
in macros with a `&rest args' which are supposed to be evaluated.
(My motivation for this is to use this macro in another patch which I
didn't want to make longer with out-of-scope additions. If this is
considered not worth polluting the `cl-' namespace over I can just write
the forms by hand so it's fine either way.)
--=-=-=
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filename=0001-Add-a-version-of-cl-once-only-which-handles-lists-of.patch
From e8af4374454965d541ad3b8062e6793217d4e86f Mon Sep 17 00:00:00 2001
From: Thuna <thuna.cing@HIDDEN>
Date: Sun, 28 Jul 2024 22:26:41 +0200
Subject: [PATCH] Add a version of cl-once-only which handles lists of forms
* lisp/emacs-lisp/cl-macs.el (cl-once-only*): Define macro.
---
lisp/emacs-lisp/cl-macs.el | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 2e501005bf7..70d66b3a250 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -2544,6 +2544,43 @@ cl-once-only
collect `(,(car name) ,gensym))
,@body)))))
+(defmacro cl-once-only* (listvar &rest body)
+ "Generate code to evaluate the list of forms LISTVAR just once in BODY.
+
+This is a macro to be used while defining other macros. LISTVAR should
+be a variable which holds a list of forms, such as ARGS in a function
+call of the form \\=`(,head ,@args). Within BODY, the variable LISTVAR
+will be bound to a list of uninterned symbols of the same length, all of
+which are variables in the final macroexpansion which are bound to the
+result of evaluating the corresponding form.
+
+For example, the following macro
+
+ (defmacro my-list (head &rest args)
+ (cl-once-only* args
+ \\=`(list (,head ,@args) ,@args)))
+
+when called like
+
+ (let ((x \\='(1 5 4)))
+ (my-list + (pop x) (1+ (pop x)) (1- (pop x))))
+
+will expand into
+
+ (let ((x \\='(1 5 4)))
+ (let* ((arg1 (pop x)) (arg2 (1+ (pop x))) (arg3 (1- (pop x))))
+ (list (+ arg1 arg2 arg3) arg1 arg2 arg3)))
+
+and the arguments will be evaluated only once and in order."
+ (declare (debug (arg body)) (indent 1))
+ (let ((args (gensym (symbol-name listvar))))
+ `(let ((,args
+ (cl-loop for i from 1 to (length ,listvar) collect
+ (make-symbol (format "%s$%d" ',(symbol-name args) i)))))
+ `(let* ,(cl-mapcar #'list ,args ,listvar)
+ ,(let ((,listvar ,args))
+ ,@body)))))
+
;;; Multiple values.
;;;###autoload
--
2.44.2
--=-=-=--
Thuna <thuna.cing@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#72344; Package emacs.
Full text available.
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