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.bugs Subject: bug#31796: 27.1; dired-do-find-regexp-and-replace fails to find multiline regexps Date: Wed, 02 Dec 2020 19:47:43 +0200 Message-ID: <83wny0f6bk.fsf@gnu.org> References: <10120030-8b8d-b702-add4-8f099f934ed5@chalmers.se> <831rgivl7l.fsf@gnu.org> <83lfequ30g.fsf@gnu.org> <83a6v6tss9.fsf@gnu.org> <08c0bbce-051e-7a49-106a-d6d0629b2224@yandex.ru> <83k0u1il6c.fsf@gnu.org> <83blfcgst9.fsf@gnu.org> <83zh2wf6or.fsf@gnu.org> <0646a65f-db21-b377-6897-caeb6ff3e10c@yandex.ru> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="3368"; mail-complaints-to="usenet@ciao.gmane.io" Cc: abela@chalmers.se, rms@gnu.org, 31796@debbugs.gnu.org To: Dmitry Gutov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Dec 02 18:49:29 2020 Return-path: Envelope-to: geb-bug-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 1kkWFt-0000m4-NE for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 02 Dec 2020 18:49:29 +0100 Original-Received: from localhost ([::1]:46482 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kkWFs-0004rv-Ot for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 02 Dec 2020 12:49:28 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39772) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kkWFS-0004qA-Bu for bug-gnu-emacs@gnu.org; Wed, 02 Dec 2020 12:49:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:53945) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kkWFS-0003s8-46 for bug-gnu-emacs@gnu.org; Wed, 02 Dec 2020 12:49:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1kkWFS-00056F-2x for bug-gnu-emacs@gnu.org; Wed, 02 Dec 2020 12:49:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 02 Dec 2020 17:49:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 31796 X-GNU-PR-Package: emacs Original-Received: via spool by 31796-submit@debbugs.gnu.org id=B31796.160693128619541 (code B ref 31796); Wed, 02 Dec 2020 17:49:02 +0000 Original-Received: (at 31796) by debbugs.gnu.org; 2 Dec 2020 17:48:06 +0000 Original-Received: from localhost ([127.0.0.1]:37258 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kkWEY-000555-8k for submit@debbugs.gnu.org; Wed, 02 Dec 2020 12:48:06 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:49500) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kkWEU-00054X-9S for 31796@debbugs.gnu.org; Wed, 02 Dec 2020 12:48:05 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:54587) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kkWEN-0003hm-Ey; Wed, 02 Dec 2020 12:47:55 -0500 Original-Received: from [176.228.60.248] (port=2642 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kkWED-0006pU-ML; Wed, 02 Dec 2020 12:47:46 -0500 In-Reply-To: <0646a65f-db21-b377-6897-caeb6ff3e10c@yandex.ru> (message from Dmitry Gutov on Wed, 2 Dec 2020 19:43:52 +0200) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:194822 Archived-At: > Cc: rms@gnu.org, abela@chalmers.se, 31796@debbugs.gnu.org > From: Dmitry Gutov > Date: Wed, 2 Dec 2020 19:43:52 +0200 > > >> Although... since it has to scan the full file anyway, it could first do > >> a quick detection, and then maybe rescan from the beginning if the > >> encoding turns out to be something else. > > > > That'd be too late, as some matches were already output. > > It could buffer them until the full file has been parsed. Encoding > detection and conversion must add a certain overhead anyway, so I'm not > sure how expensive the extra buffering would be in comparison. > > As a bonus, per-file buffering like that would allow easier > parallelization of searches. Buffering means you don't output matches as soon as you find them, which might be regarded as a kind of regression -- see Richard's bug reports a few days ago. And since you never know where in the file the telltale byte sequences will appear, you will need to always wait until the entire file is read -- which could be prohibitive for very large files.