From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Nicolas Richard Newsgroups: gmane.emacs.help Subject: Re: How to test if the current line contains only white-spache? Date: Wed, 25 Nov 2015 15:04:07 +0100 Message-ID: <87r3jeb2g8.fsf@ulb.ac.be> References: <87r3js7e8l.fsf@linux-qg7d.fritz.box> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1448463135 21041 80.91.229.3 (25 Nov 2015 14:52:15 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 25 Nov 2015 14:52:15 +0000 (UTC) Cc: help-gnu-emacs@gnu.org To: Rolf Ade Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Nov 25 15:51:59 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1a1bQL-00011N-IH for geh-help-gnu-emacs@m.gmane.org; Wed, 25 Nov 2015 15:51:57 +0100 Original-Received: from localhost ([::1]:45745 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1bQN-00009P-Br for geh-help-gnu-emacs@m.gmane.org; Wed, 25 Nov 2015 09:51:59 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:41691) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1agC-0006Hu-W5 for help-gnu-emacs@gnu.org; Wed, 25 Nov 2015 09:04:17 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a1ag8-0001Wy-Bx for help-gnu-emacs@gnu.org; Wed, 25 Nov 2015 09:04:16 -0500 Original-Received: from mxin.ulb.ac.be ([164.15.128.112]:18260) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a1ag8-0001Wu-6L for help-gnu-emacs@gnu.org; Wed, 25 Nov 2015 09:04:12 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtEEALG+VVakD4Xx/2dsb2JhbABegmmCFIJfvVaGDwKCDQEBAQEBAYELhDUBAQR5EAgDISUPAQRJE4guuV+EJQELASCGVIR+iTkFlleWRZNOY4QFPTSFLAEBAQ Original-Received: from mathsrv4.ulb.ac.be (HELO localhost) ([164.15.133.241]) by smtp.ulb.ac.be with ESMTP; 25 Nov 2015 15:03:48 +0100 In-Reply-To: <87r3js7e8l.fsf@linux-qg7d.fritz.box> (Rolf Ade's message of "Sat, 14 Nov 2015 17:11:22 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 164.15.128.112 X-Mailman-Approved-At: Wed, 25 Nov 2015 09:51:42 -0500 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:108213 Archived-At: Rolf Ade writes: > For some random minor elisp code I need to know, if the current line > contains only white-space characters[1]. > > I came up with this somewhat convoluted code: > > (beginning-of-line) > (skip-chars-forward " \t") > (let ((text-start (current-column))) > (end-of-line) > (if (= text-start (current-column)) > t > nil) FWIW I would do : (save-excursion (beginning-of-line) (skip-chars-forward " \t") (eolp)) but IANAL(isper). -- Nico.