From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: inverse of add-to-list: remove-from-list Date: Tue, 13 Oct 2020 09:57:13 -0400 Message-ID: References: <87pn5mtt2x.fsf@mat.ucm.es> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29761"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Oct 13 15:58:32 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 1kSKox-0007e5-1c for ged-emacs-devel@m.gmane-mx.org; Tue, 13 Oct 2020 15:58:31 +0200 Original-Received: from localhost ([::1]:41766 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kSKow-0003bs-3b for ged-emacs-devel@m.gmane-mx.org; Tue, 13 Oct 2020 09:58:30 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51008) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSKnr-0002io-Q8 for emacs-devel@gnu.org; Tue, 13 Oct 2020 09:57:23 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:17898) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSKnl-0004pv-79 for emacs-devel@gnu.org; Tue, 13 Oct 2020 09:57:22 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id C0E65441043; Tue, 13 Oct 2020 09:57:15 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 7EDDE441041; Tue, 13 Oct 2020 09:57:14 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1602597434; bh=heYsAqeMLffPoUMSNV3R0mMHiq8EbpREAwM541raAvA=; h=From:To:Subject:References:Date:In-Reply-To:From; b=GypxtFVhdDWUofvLD/GYLGFDp6aahz9Sw7jMf2bICEwHV6PtIkCAS1jAciQFGDUqp 3644eW0IswXyoBkCEBv2eWU4BjL9+4+SSWHFOPJiM82bJcWPvaTntRJeyXOucmDLS0 sT5nJYXeqtY0Ci1B337n68dJM7PK6Jqv+rtriRnD1QYYDYa1TkxaJY3gpOE99IBXqt F78DO7PWscMShIhxl6yyV/TDptheuXWHGAUkbX3xsZfutmDP+5pkwBjSbNK0hkLx5n N4GBcqrtjrT9SnUysDaDnlDIG0KVdQXnaq2PsHCzV0R/dziXMhgNZzUyU97IoPhKwz RwGjaGlGEX8JQ== Original-Received: from alfajor (unknown [157.52.9.240]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 5B975120294; Tue, 13 Oct 2020 09:57:14 -0400 (EDT) In-Reply-To: <87pn5mtt2x.fsf@mat.ucm.es> (Uwe Brauer's message of "Tue, 13 Oct 2020 10:42:46 +0200") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/13 09:23:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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:257531 Archived-At: Uwe Brauer [2020-10-13 10:42:46] wrote: > This has always bothered me: for example > > (add-to-list 'org-export-filter-src-block-functions > 'my-html-filter-src-blocks) I think this reflects a misdesign in `org-export-filters-alist`. It should use hooks rather than lists of functions. This way you'd use `add-hook` instead of `add-to-list`. > (remove-from-list 'org-export-filter-src-block-functions > 'my-html-filter-src-blocks) > > Does not exist. Wouldn't that be useful? I think if we want to add something to remove an element from a variable holding a list, then we should make it accept a "place" rather than a symbol as argument. I.e. make it the opposite of `push` (or `cl-pushnew`) rather than the opposite of `add-to-list`. Stefan "who dislikes `add-to-list`"