From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Re: Is there a way of setting a variable only when it exists? Date: Tue, 15 Mar 2022 08:45:42 +0100 Message-ID: <878rtbveu1.fsf@mbork.pl> References: <87lexdul8e.fsf@mbork.pl> <878rtcir1h.fsf@zoho.eu> <87a6drviwp.fsf@mbork.pl> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33348"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.1.0; emacs 29.0.50 Cc: help-gnu-emacs@gnu.org, Emanuel Berg To: Jean Louis Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Mar 15 08:46:26 2022 Return-path: Envelope-to: geh-help-gnu-emacs@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 1nU1sw-0008TC-CD for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 15 Mar 2022 08:46:26 +0100 Original-Received: from localhost ([::1]:55158 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nU1sv-0002KZ-6Q for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 15 Mar 2022 03:46:25 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:56688) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nU1sV-0002K5-3D for help-gnu-emacs@gnu.org; Tue, 15 Mar 2022 03:45:59 -0400 Original-Received: from mail.mojserwer.eu ([195.110.48.8]:59222) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nU1sS-0001Sc-83 for help-gnu-emacs@gnu.org; Tue, 15 Mar 2022 03:45:58 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id 72E17E70B0; Tue, 15 Mar 2022 08:45:51 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yHOMo2LG90X3; Tue, 15 Mar 2022 08:45:43 +0100 (CET) Original-Received: from localhost (178235147016.dynamic-3-poz-k-0-1-0.vectranet.pl [178.235.147.16]) by mail.mojserwer.eu (Postfix) with ESMTPSA id 1876FE653B; Tue, 15 Mar 2022 08:45:43 +0100 (CET) In-reply-to: Received-SPF: pass client-ip=195.110.48.8; envelope-from=mbork@mbork.pl; helo=mail.mojserwer.eu X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:136568 Archived-At: On 2022-03-15, at 07:58, Jean Louis wrote: > * Marcin Borkowski [2022-03-15 09:28]: >> What if it's an internal Emacs variable which might become a user option >> one day (I submitted a bug report about it) and then my customization >> silently disappears? It's the "silently" part I want to guard >> against... > > I am trying to understand: > > - what is user option? It is defined in the Emacs manual. > Now, if variable becomes in future "user option" most probably your > settings will still be kept in place, your customization will not > silently disappear unless you delete it from your files. > > Did I understand it all well? No. If an internal variable (= one whose name contains two dashes) becomes a user option, its name will most probably change. Best, -- Marcin Borkowski http://mbork.pl