From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Thibaut Verron Newsgroups: gmane.emacs.devel Subject: Re: inverse of add-to-list: remove-from-list Date: Fri, 16 Oct 2020 13:14:03 +0200 Message-ID: References: <87pn5mtt2x.fsf@mat.ucm.es> Reply-To: thibaut.verron@gmail.com Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="4894"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Oct 16 13:15:15 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kTNha-00019Y-Lm for ged-emacs-devel@m.gmane-mx.org; Fri, 16 Oct 2020 13:15:14 +0200 Original-Received: from localhost ([::1]:51102 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kTNhZ-0005ST-OK for ged-emacs-devel@m.gmane-mx.org; Fri, 16 Oct 2020 07:15:13 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55196) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kTNge-0004zH-Rm for emacs-devel@gnu.org; Fri, 16 Oct 2020 07:14:16 -0400 Original-Received: from mail-yb1-xb36.google.com ([2607:f8b0:4864:20::b36]:41920) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kTNgd-0006al-78 for emacs-devel@gnu.org; Fri, 16 Oct 2020 07:14:16 -0400 Original-Received: by mail-yb1-xb36.google.com with SMTP id x20so1600003ybs.8 for ; Fri, 16 Oct 2020 04:14:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:reply-to:from:date:message-id :subject:to:cc:content-transfer-encoding; bh=AYR2nZrBr03HlRFBAFejPanJ0k6Wf6JHL6ATrbjTgmw=; b=ehPQ3Cqv+WYVugDMdKU3FKCktQXCx7Ogs4vXeTCR44d/cPZvZUWc5L2JJodjpO/oWQ n9nq97nKXnyaErlXDxs79mPS6KvTrIZ+xc63ub89KESt7ujDH6odiTH7rmIOjJZmTKS6 g4+dA+7d6FM0A9jRALJTaeOYB8Hs89Sh+HHpvN5gLZuSpuXhz+4LHRWRaLkn3FcEnjsU OL1X8BcP9v8I0Q3dYOO5YpBcVky2oQ5OTLJ2+esiWWoXougizz+3HB4xtUsza9ItEJDF 3PHwnIAB7UucHs5z5ftqz2ZtxZo2IFyBjEWTkxJcd1N1+M+1XA/N4nfWRxMzlSbE1RUg j32w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:reply-to :from:date:message-id:subject:to:cc:content-transfer-encoding; bh=AYR2nZrBr03HlRFBAFejPanJ0k6Wf6JHL6ATrbjTgmw=; b=A16eCZNLDyUMH1ejrtdJQvzEKLwc1knSifSX4Jq8veXyxZHz2YEQphMQX2/gS3Ij5a Fcjcxe2Xcw/7DXervGMubs2RKDJEfL40VnLW9LO0WnozmOwEtN6k7GvrCwoJedTMvNq7 29Z4K5fIfiH5VZUEoQXUtoqhwcJS+jHkYA0NSQiKluG6Ur8rdpXs9/OzbzF4uVRXF4eh 6eVF7lPy5HGnvZTVSQzse1yCnjXHMrkNwuU3xqbYzjXbYVVpSDnULZm7GfyerUvDEOVs zQbBTJP0YPI+6pT20QCrKgvtNQVXWnjMoPxqKsUsu0/ucjEBRYW0F0jVcZZFW1NYJJk6 2P7A== X-Gm-Message-State: AOAM5321X74O8xzmztRlQlkev4+C3QPC0DvFvu6H+enCmGCYwSL9qEqO hNJTaWKzAfIoGGuCO+0yUhw9S5R9MXmGXPiDO5qF454f X-Google-Smtp-Source: ABdhPJwsh2j2UpU+q15M5Q96tWCgYkJHYdSQ6cl32261rJgBFv7L9ineu2vIW/6xVKEbB7EQkfARufRIuBj4c6cyMHU= X-Received: by 2002:a25:6585:: with SMTP id z127mr4673620ybb.33.1602846854197; Fri, 16 Oct 2020 04:14:14 -0700 (PDT) In-Reply-To: Received-SPF: pass client-ip=2607:f8b0:4864:20::b36; envelope-from=thibaut.verron@gmail.com; helo=mail-yb1-xb36.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:257796 Archived-At: Le jeu. 15 oct. 2020 =C3=A0 18:31, Stefan Monnier a =C3=A9crit : > > > I might be missing something, but where would the harm be in using > >> (add-hook 'org-export-filter-src-block-functions 'my-html-filter-src-b= locks) > > even if it is not a hook? > > I think none, but it would be harmful to do: > > (add-hook 'org-export-filter-src-block-functions > #'my-html-filter-src-blocks > nil t) Oh, right, thanks. > > So basically the answer would be, instead of looking for an opposite > > to add-to-list, use cl-pushnew which has a natural opposite in > > cl-remove. Is that so? > > `cl-remove` is not the opposite of `cl-pushnew`, because > > (cl-pushnew V X :test F) > (cl-remove V X :test F) > > will usually result in X being different from what it started (because > `cl-remove` does not modify its argument X). Oops. I guess it goes to say how confusing the situation is. :)