From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philip Kaludercic Newsgroups: gmane.emacs.help Subject: Re: (interactive) and &optional Date: Fri, 24 Mar 2023 20:52:23 +0000 Message-ID: <87sfdt6feg.fsf@posteo.net> References: <25628.42021.832534.376361@woitok.gmail.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="5134"; mail-complaints-to="usenet@ciao.gmane.io" 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 21:53:15 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 1pfoPT-0000mn-8b for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 24 Mar 2023 21:53:15 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pfoOp-0000gQ-Bj; Fri, 24 Mar 2023 16:52:35 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pfoOn-0000gB-30 for Help-Gnu-Emacs@Gnu.Org; Fri, 24 Mar 2023 16:52:33 -0400 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pfoOk-0002rk-Pa for Help-Gnu-Emacs@Gnu.Org; Fri, 24 Mar 2023 16:52:32 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id A191724020B for ; Fri, 24 Mar 2023 21:52:25 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1679691145; bh=nZaiX7rbv3NOsGbRohjzIJecig1cYGpebC1Mo0bmjHU=; h=From:To:Cc:Subject:Autocrypt:Date:From; b=JydiF+7CwJ69cOEgn2elrvFf8xTmajBkT4/gP3gCXkf5GY2xo9sTBc4xYBW2NahYn 0kMMJcQko4aiUSXQK3eDVogV4vqaMDuQYImYXfzsCOuaNOaMEy7JY0QhsfE4uZ1Z2t vH+B6Nn0Gtj1pRugvfrcFobTl5Dk/gPqcTtTLdTdfm8g3Yjl96mRSmFiKbZlFUWGV5 dyur15DYeg1YmPOpJOgZC/dsf2NA3dxJZzgB82uKyYy8GVWA/12APJxKh/CEpjqLAq 3D5laikQnFYTr2TbSBBGwpR0gsg+CM5H7mlVloDvxvtLSpQQ1XtcNomEhtZbGf1i2/ MhAdoWU9VFxtg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4PjvXm6lj6z6tnw; Fri, 24 Mar 2023 21:52:24 +0100 (CET) In-Reply-To: (Jean Louis's message of "Fri, 24 Mar 2023 12:23:29 +0300") Autocrypt: addr=philipk@posteo.net; keydata= mDMEZBBQQhYJKwYBBAHaRw8BAQdAHJuofBrfqFh12uQu0Yi7mrl525F28eTmwUDflFNmdui0QlBo aWxpcCBLYWx1ZGVyY2ljIChnZW5lcmF0ZWQgYnkgYXV0b2NyeXB0LmVsKSA8cGhpbGlwa0Bwb3N0 ZW8ubmV0PoiWBBMWCAA+FiEEDg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwMFCQHhM4AFCwkI BwIGFQoJCAsCBBYCAwECHgECF4AACgkQ8xYDWXahwulikAEA77hloUiSrXgFkUVJhlKBpLCHUjA0 mWZ9j9w5d08+jVwBAK6c4iGP7j+/PhbkxaEKa4V3MzIl7zJkcNNjHCXmvFcEuDgEZBBQQhIKKwYB BAGXVQEFAQEHQI5NLiLRjZy3OfSt1dhCmFyn+fN/QKELUYQetiaoe+MMAwEIB4h+BBgWCAAmFiEE Dg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwwFCQHhM4AACgkQ8xYDWXahwukm+wEA8cml4JpK NeAu65rg+auKrPOP6TP/4YWRCTIvuYDm0joBALw98AMz7/qMHvSCeU/hw9PL6u6R2EScxtpKnWof z4oM Received-SPF: pass client-ip=185.67.36.65; envelope-from=philipk@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=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:143106 Archived-At: Jean Louis writes: > * 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))) The issue here is that the function is difficult to re-use from other scripts. If the interactive stuff is encapsulated within an (interactive) form then you avoid the issue. -- Philip Kaludercic