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: (interactive) and &optional Date: Thu, 23 Mar 2023 21:01:51 +0100 Message-ID: <87ilerkzio.fsf@dataswamp.org> 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="29159"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:6E+19w2/PJ7kInsDFdkoO29nj4c= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Mar 23 21:13:22 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 1pfRJK-0007OO-8a for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 23 Mar 2023 21:13:22 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pfRIr-0005A4-9F; Thu, 23 Mar 2023 16:12:53 -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 1pfR8M-0000T1-N5 for help-gnu-emacs@gnu.org; Thu, 23 Mar 2023 16:02:02 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pfR8L-0001WU-36 for help-gnu-emacs@gnu.org; Thu, 23 Mar 2023 16:02:02 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pfR8I-0000aY-ML for help-gnu-emacs@gnu.org; Thu, 23 Mar 2023 21:01:58 +0100 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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Thu, 23 Mar 2023 16:12:51 -0400 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:143100 Archived-At: Rainer Woitok wrote: > In an attempt to write a function with and optional argument > which is both, callable from Lisp and via "M-x", I ran into > some unexpected (by me) problems. Consider the following > function: > > (defun fun (&optional arg) > (interactive "Sarg: ") > (message "%s:%s.\n" 'val (symbol-name arg))) See this file. The lines like this (or beg (setq beg (point-min))) are what does it. If you do it like this, it always work both interactively and from Lisp and you are able to set a default value that is the same for both methods. ;;; -*- lexical-binding: t -*- ;; ;; this file: ;; https://dataswamp.org/~incal/emacs-init/dwim.el ;; ;; DWIM code helpers and examples. ;; ;; Advantages to this style: ;; ;; - the same default interactively and from Lisp ;; - the default is the whole buffer ;; - the region is never used from Lisp ;; - the variables are always set, to the default if not explicitely ;; - one can still have preceding, non-optional arguments (defun use-region (&optional both) (if (use-region-p) (list (region-beginning) (region-end)) (when both (list nil nil) ))) (defun test-dwim (&optional beg end) (interactive (use-region)) (or beg (setq beg (point-min))) (or end (setq end (point-max))) (message "%d %d" beg end) ) (defun test-dwim-2 (re &optional beg end) (interactive `(,(read-regexp "regexp: ") ,@(use-region))) (or beg (setq beg (point-min))) (or end (setq end (point-max))) (message "%s %d %d" re beg end) ) (provide 'dwim) -- underground experts united https://dataswamp.org/~incal