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: Should prefix variable be used in function argument list Date: Fri, 08 Jul 2022 20:09:47 +0200 Message-ID: <87r12va32s.fsf@dataswamp.org> References: <87bktzbiyi.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="26081"; 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:efxSjKjLa/HGp4gXuQnVJY/7agw= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jul 08 20:11:25 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 1o9sRp-0006aV-2C for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 08 Jul 2022 20:11:25 +0200 Original-Received: from localhost ([::1]:57698 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o9sRn-0007CS-MA for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 08 Jul 2022 14:11:23 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:47898) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o9sQQ-0007Bt-Ta for help-gnu-emacs@gnu.org; Fri, 08 Jul 2022 14:10:00 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:55990) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o9sQP-0001C6-6B for help-gnu-emacs@gnu.org; Fri, 08 Jul 2022 14:09:58 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1o9sQM-0004v4-HO for help-gnu-emacs@gnu.org; Fri, 08 Jul 2022 20:09:54 +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:138386 Archived-At: > All arguments that have a nil they can take on and that > makes sense, all those cand be optional if they appear to > the right of the last argument from that isn't optional. > What will happen it will just be nil which. *which will then be used. (zzz :)) You can also check and see if it's nil and, if so, set it to something else. This can be used to give it a default value, one can have one for interactive use, and one for non-interactive, or the same for both. Here OTOH it's not an shame to one's family to do differently, on the contrary that can make a lot of sense. E.g., interactively the default can be (point) if that feels intuitive, while non-interactively that would be better set to (point-min). Again see this file and I'm happy to add more/better examples ... https://dataswamp.org/~incal/emacs-init/dwim.el -- underground experts united https://dataswamp.org/~incal