From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: Prefix Argument and optional argument Date: Thu, 07 Jul 2022 13:51:36 +0200 Message-ID: <87edyxf8dz.fsf@dataswamp.org> References: <87h73t5gyi.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="15341"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:5f/umQQdMqCOBj06lp6z6Rz8EdA= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jul 07 13:52:14 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 1o9Q3I-0003ar-9V for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 07 Jul 2022 13:52:12 +0200 Original-Received: from localhost ([::1]:39386 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o9Q3G-0005pr-QU for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 07 Jul 2022 07:52:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53262) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o9Q2t-0005pT-EH for help-gnu-emacs@gnu.org; Thu, 07 Jul 2022 07:51:47 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:39552) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o9Q2r-00072m-Qd for help-gnu-emacs@gnu.org; Thu, 07 Jul 2022 07:51:47 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1o9Q2o-0002mf-Ne for help-gnu-emacs@gnu.org; Thu, 07 Jul 2022 13:51:42 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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:138341 Archived-At: Michael Heerdegen wrote: >> Why using &optional is ok, but not ok without it? > > Non-interactive calls don't come with a prefix arg. When you > call your function from Lisp, it's often not useful to > provide something for that argument so it makes no sense to > make it mandatory. You can make it mandatory if the argument > also has a meaning for calls from ELisp. Mess as little as possible with all the interactive stuff from Lisp. Uhm, what is all the interactive stuff exactly now again? -- underground experts united https://dataswamp.org/~incal