From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: (interactive) and &optional Date: Fri, 24 Mar 2023 12:23:29 +0300 Message-ID: References: <25628.42021.832534.376361@woitok.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="13678"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.2.9+54 (af2080d) (2022-11-21) Cc: Help-Gnu-Emacs@Gnu.Org To: Dr Rainer Woitok Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Mar 24 16:58:41 2023 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 1pfjoN-0003Au-4T for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 24 Mar 2023 16:58:39 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pfigL-0008LF-4B; Fri, 24 Mar 2023 10:46:17 -0400 Original-Received: from [2001:470:142:3::10] (helo=eggs.gnu.org) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pfigJ-0008Jw-06 for Help-Gnu-Emacs@gnu.org; Fri, 24 Mar 2023 10:46:15 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pfig8-000357-TS for Help-Gnu-Emacs@gnu.org; Fri, 24 Mar 2023 10:46:07 -0400 Original-Received: from localhost ([::ffff:197.239.35.107]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 00000000000F5D3F.00000000641D7CB4.00006C31; Fri, 24 Mar 2023 03:34:27 -0700 Mail-Followup-To: Dr Rainer Woitok , Help-Gnu-Emacs@Gnu.Org Content-Disposition: inline In-Reply-To: <25628.42021.832534.376361@woitok.gmail.com> Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:143104 Archived-At: * Dr Rainer Woitok [2023-03-23 22:12]: > Am I really expected in a function that is both, callable from Lisp and > via "M-x", to code something along the lines of > > (cond ((or (null arg) (string-empty-p arg)) 'default-val) > (arg)) > > to check whether or not an optional argument has been passed? Are there > any more elegant ways to achieve this? I do not like involving `interactive' at all, so I do the handling by providing optional argument and telling function to check for it, or ask for it. (defun search-something (&optional query) "Search something by using QUERY." (interactive) (let* ((query (or query (read-from-minibuffer "Query: ")))) (do-the-search query))) -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/