From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: favorite subject DWIM Date: Sun, 15 Aug 2021 06:30:46 +0200 Message-ID: <87tujrs51l.fsf@zoho.eu> References: <8735rfueqg.fsf@zoho.eu> <8735rbe4r2.fsf@disroot.org> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="16990"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:QYDEX53QOkSWHcs3pdPevkI8ifY= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Aug 15 06:31:41 2021 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 1mF7oD-0004DM-3k for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 15 Aug 2021 06:31:41 +0200 Original-Received: from localhost ([::1]:35682 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mF7oB-0001rw-I4 for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 15 Aug 2021 00:31:39 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55058) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mF7ne-0001rn-Rr for help-gnu-emacs@gnu.org; Sun, 15 Aug 2021 00:31:06 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:50154) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mF7nZ-0002xQ-2A for help-gnu-emacs@gnu.org; Sun, 15 Aug 2021 00:31:06 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mF7nW-0003T5-VS for help-gnu-emacs@gnu.org; Sun, 15 Aug 2021 06:30:58 +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: -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-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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:132564 Archived-At: Abhiseck Paira wrote: >> ;;; -*- lexical-binding: t -*- >> ;;; >> ;;; this file: >> ;;; https://dataswamp.org/~incal/public_html/emacs-init/dwim.el > > This file is not found (404). You are right, here is the correct URL: https://dataswamp.org/~incal/emacs-init/dwim.el I still yank the whole file, last. >> (defun test-dwim (&optional beg end) >> (interactive (when (use-region-p) >> (list (region-beginning) (region-end)) )) >> (let ((bg (or beg (point-min))) >> (ed (or end (point-max))) ) >> (list bg ed) )) > > Why do you have interactive declaration? [...] Wouldn't most > of the time this function be called by some other function? It depends on the actual function but since it involves the region it is probably used most often interactively. > Nit-picking: I think the let form is unnecessary. Here the values are only returned but one can think of more complicated stuff where the values are used repeatedly. But actually it isn't a bad thing to be clear about that step and get it over first thing, it is needed for the &optional arguments which will be nil if called from Lisp without arguments. >> (when nil >> (progn >> (set-mark 10) >> (forward-line 3) >> (call-interactively #'test-dwim) ) ; (10 500) >> >> (call-interactively #'test-dwim) ; ( 1 604) >> >> (test-dwim 30 100) ; (30 100) >> >> (test-dwim) ; ( 1 604) >> ) > > Since I couldn't find your file, I may be lacking context, > what it seems here you're testing the function? Yes, as you see it can be used with a region, without a region (whole buffer acted upon - DWIM), with arguments from Lisp, and without - in which case again the whole buffer will be used, so the interactive/no-region is analogous to from-Lisp/no-arguments. DWIM! ;;; -*- lexical-binding: t -*- ;;; ;;; this file: ;;; https://dataswamp.org/~incal/emacs-init/dwim.el (defun test-dwim (&optional beg end) (interactive (when (use-region-p) (list (region-beginning) (region-end)) )) (let ((bg (or beg (point-min))) (ed (or end (point-max))) ) (list bg ed) )) (when nil (progn (set-mark 10) (forward-line 3) (call-interactively #'test-dwim) ) ; (10 500) (call-interactively #'test-dwim) ; ( 1 604) (test-dwim 30 100) ; (30 100) (test-dwim) ; ( 1 604) ) -- underground experts united https://dataswamp.org/~incal