From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: minor mode for highlighting character classes such as non-ascii (bug 47455) Date: Tue, 01 Jun 2021 19:48:01 +0300 Message-ID: <83lf7tzg3i.fsf@gnu.org> References: <23925.69978.953904.24758@gargle.gargle.HOWL> <878s3tczpg.fsf@telefonica.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24587"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: =?utf-8?Q?=C3=93scar?= Fuentes Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Jun 01 18:49:17 2021 Return-path: Envelope-to: ged-emacs-devel@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 1lo7Zt-0006Cq-9j for ged-emacs-devel@m.gmane-mx.org; Tue, 01 Jun 2021 18:49:17 +0200 Original-Received: from localhost ([::1]:43606 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lo7Zs-00072G-C7 for ged-emacs-devel@m.gmane-mx.org; Tue, 01 Jun 2021 12:49:16 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:44858) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lo7Yw-0006C9-5N for emacs-devel@gnu.org; Tue, 01 Jun 2021 12:48:18 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:36296) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lo7Yv-0007uT-Cd; Tue, 01 Jun 2021 12:48:17 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:3974 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lo7Yu-0006qL-WE; Tue, 01 Jun 2021 12:48:17 -0400 In-Reply-To: <878s3tczpg.fsf@telefonica.net> (message from =?utf-8?Q?=C3=93scar?= Fuentes on Tue, 01 Jun 2021 18:32:59 +0200) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:270220 Archived-At: > From: Óscar Fuentes > Date: Tue, 01 Jun 2021 18:32:59 +0200 > > "Roland Winkler" writes: > > > In the context of bug 47455 the idea emerged that it can be useful > > to have a minor mode that highlights non-ascii characters. I want > > to ask hear for feedback: does such a mode already exist? Can it be > > useful to have this minor mode more general such that the highlighted > > character classes become configurable? Are there possible use cases > > for this beyond non-ascii characters? > > Highlighting characters that does not belong to certain coding system > would be useful to me. Character cannot belong to a coding system. I think you mean "characters that cannot be safely encoded by a coding system". > Sometimes I work on source code encoded as UTF-8 but they must not > contain characters not encodable by windows-1252. More precisely, string > literals must be composed of characters encodable by windows-1252. We already make such tests when you save the buffer, so the code to do that exists, and can be reused. But I'm not sure this highlighting couldn't turn out to be somewhat expensive.