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: Underline the current line (function inside) Date: Fri, 11 Jun 2021 18:33:45 +0300 Message-ID: References: <83lf7ga1yk.fsf@gnu.org> 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="34915"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) Cc: help-gnu-emacs@gnu.org To: Eli Zaretskii Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jun 11 18:26:06 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 1lrjyw-0008rz-Iz for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 11 Jun 2021 18:26:06 +0200 Original-Received: from localhost ([::1]:48980 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lrjyu-0005DR-K0 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 11 Jun 2021 12:26:04 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57344) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lrjyJ-0005D4-SL for help-gnu-emacs@gnu.org; Fri, 11 Jun 2021 12:25:27 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:43179) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lrjyI-0003N7-AV; Fri, 11 Jun 2021 12:25:27 -0400 Original-Received: from localhost ([::ffff:197.157.0.23]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 00000000000D59E2.0000000060C38349.000069F0; Fri, 11 Jun 2021 08:37:45 -0700 Mail-Followup-To: Eli Zaretskii , help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: <83lf7ga1yk.fsf@gnu.org> Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -3 X-Spam_score: -0.4 X-Spam_bar: / X-Spam_report: (-0.4 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_SORBS_WEB=1.5, SPF_HELO_PASS=-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:130763 Archived-At: * Eli Zaretskii [2021-06-11 17:53]: > > Date: Fri, 11 Jun 2021 17:32:26 +0300 > > From: Jean Louis > > > > This function is handy to underline the current line: > > > > (defun underline-line () > > "Underline the current line." > > (interactive) > > (let* ((start (line-beginning-position)) > > (end (line-end-position)) > > (length (- end start))) > > (end-of-line) > > (newline) > > (insert (make-string length ?=)) > > (newline))) > > This assumes that each character takes 1 column. That is false in > general, because some characters have zero width on display, and some > others take closer to two columns. > > You need to use string-width instead, or count columns instead of > buffer positions. > > And, of course, all this assumes fixed-pitch font. Thanks. (defun underline-line () "Underline the current line." (interactive) (let* ((start (line-beginning-position)) (end (line-end-position)) (length (string-width (buffer-substring-no-properties start end)))) (end-of-line) (newline) (insert (make-string length ?=)) (newline)))