From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Re: How to check whether the current line is a comment-only one? Date: Thu, 18 Aug 2016 16:11:30 +0200 Message-ID: <87pop6p3ot.fsf@mbork.pl> References: <87vayyppop.fsf@mbork.pl> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1471529568 17763 195.159.176.226 (18 Aug 2016 14:12:48 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 18 Aug 2016 14:12:48 +0000 (UTC) User-Agent: mu4e 0.9.16; emacs 25.1.50.6 Cc: help-gnu-emacs@gnu.org To: Stefan Monnier Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Aug 18 16:12:43 2016 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1baO3m-0004P2-15 for geh-help-gnu-emacs@m.gmane.org; Thu, 18 Aug 2016 16:12:42 +0200 Original-Received: from localhost ([::1]:52911 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1baO3j-0005ph-48 for geh-help-gnu-emacs@m.gmane.org; Thu, 18 Aug 2016 10:12:39 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:54905) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1baO2i-0005l6-Ik for help-gnu-emacs@gnu.org; Thu, 18 Aug 2016 10:11:40 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1baO2e-0001QD-O4 for help-gnu-emacs@gnu.org; Thu, 18 Aug 2016 10:11:36 -0400 Original-Received: from mail.mojserwer.eu ([195.110.48.8]:34164) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1baO2e-0001Pr-GQ for help-gnu-emacs@gnu.org; Thu, 18 Aug 2016 10:11:32 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id F337FE647C; Thu, 18 Aug 2016 16:11:31 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7PFoXhsSIZQF; Thu, 18 Aug 2016 16:11:29 +0200 (CEST) Original-Received: from localhost (unknown [IPv6:2a01:114f:970:8d00:a288:b4ff:fe90:5e24]) by mail.mojserwer.eu (Postfix) with ESMTPSA id 38F5BE6029; Thu, 18 Aug 2016 16:11:29 +0200 (CEST) In-reply-to: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 195.110.48.8 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.help:111174 Archived-At: On 2016-08-18, at 09:44, Stefan Monnier wrote: >> is there a predicate function to determine whether the line the point = is >> in is entirely a comment line? > > I don't think there is one yet. Depending on what you mean by "entirel= y > a comment", it could be: > > (save-excursion > (forward-line 0) > (< (line-end-position) > (let ((ppss (syntax-ppss))) > (when (nth 4 ppss) > (goto-char (nth 8 ppss))) > (forward-comment (point-max)) > (point)))) Hi Stefan, from a cursory read of the above, this might be exactly what I need. Thanks. BTW, AUCTeX has a function called `TeX-in-commented-line'. Here's its docstring: --8<---------------cut here---------------start------------->8--- Return non-nil if point is in a line consisting only of a comment. The comment can be preceded by whitespace. This means that =E2=80=98TeX-in-commented-line=E2=80=99 is more general than =E2=80=98TeX= -in-line-comment=E2=80=99 which will not match commented lines with leading whitespace. But =E2=80=98TeX-in-commented-line=E2=80=99 will match commented lines withou= t leading whitespace as well. --8<---------------cut here---------------end--------------->8--- > -- Stefan Best, --=20 Marcin Borkowski http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski Faculty of Mathematics and Computer Science Adam Mickiewicz University