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: dired-do-find-regexp failure with latin-1 encoding Date: Sun, 29 Nov 2020 19:18:58 +0200 Message-ID: <83mtz0krnh.fsf@gnu.org> References: <87blfhjr4q.fsf@gmx.net> <83k0u5mjvf.fsf@gnu.org> <877dq5jp51.fsf@gmx.net> <83im9pmh0v.fsf@gnu.org> <106736d6-1732-3f24-15c5-af7bcfd688c6@yandex.ru> <83blfhmdho.fsf@gnu.org> <247a8edb-7b70-ad32-1ba1-43b5458a82b0@yandex.ru> <42ba5cae-e0d7-afd1-9974-62e7ee5840c6@yandex.ru> <83360smbq8.fsf@gnu.org> <1142c209-27d4-292c-f087-e0ccb480d893@yandex.ru> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="38713"; mail-complaints-to="usenet@ciao.gmane.io" Cc: stephen.berman@gmx.net, emacs-devel@gnu.org To: Dmitry Gutov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Nov 29 18:19:39 2020 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 1kjQMN-0009yH-FE for ged-emacs-devel@m.gmane-mx.org; Sun, 29 Nov 2020 18:19:39 +0100 Original-Received: from localhost ([::1]:53652 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kjQMM-0002jO-Hs for ged-emacs-devel@m.gmane-mx.org; Sun, 29 Nov 2020 12:19:38 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:45252) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kjQLu-0002Ka-7A for emacs-devel@gnu.org; Sun, 29 Nov 2020 12:19:10 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:37001) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kjQLt-0005fc-Ra; Sun, 29 Nov 2020 12:19:09 -0500 Original-Received: from [176.228.60.248] (port=1701 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kjQLt-0007De-7g; Sun, 29 Nov 2020 12:19:09 -0500 In-Reply-To: <1142c209-27d4-292c-f087-e0ccb480d893@yandex.ru> (message from Dmitry Gutov on Sun, 29 Nov 2020 18:27:24 +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:260015 Archived-At: > Cc: stephen.berman@gmx.net, emacs-devel@gnu.org > From: Dmitry Gutov > Date: Sun, 29 Nov 2020 18:27:24 +0200 > > > How can --pre help? It still cannot easily support different > > encodings in the same command, right? > > It can help by calling iconv with different arguments depending on the > contents of each file. Which is valuable, I think, because we're > normally not piping file contents to grep (or, potentially, rg), instead > we pass multiple file names to it using xargs. > > That wouldn't be easy, but some script that performs conversion based on > file contents could work. It could work in principle, but I think in practice it will not be faster than doing everything in Emacs Lisp, because each file will need to be read twice. > > It would be brittle, unless that program actually reads the entire > > file (which will be slow). > > How does Emacs do it? Does it read until the end of the file? No, just a small initial part of it. That's one reason why the results are not guaranteed to be correct.