From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Text copied from *grep* buffer has NUL (0x00) characters Date: Sun, 09 May 2021 09:57:22 -0400 Message-ID: References: Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="27115"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:y7nhqkYx0yodveqsYf54pKGUz8A= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun May 09 15:57:58 2021 Return-path: Envelope-to: geh-help-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 1lfjwT-0006u9-O1 for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 09 May 2021 15:57:57 +0200 Original-Received: from localhost ([::1]:43890 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lfjwS-0005AK-RS for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 09 May 2021 09:57:56 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59322) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfjw5-00058m-LJ for help-gnu-emacs@gnu.org; Sun, 09 May 2021 09:57:33 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:49648) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfjw4-0000re-8A for help-gnu-emacs@gnu.org; Sun, 09 May 2021 09:57:33 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lfjw2-0006PG-Jn for help-gnu-emacs@gnu.org; Sun, 09 May 2021 15:57:30 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:129619 Archived-At: > 2) Copying text from a *grep* buffer that looks like ":" should not suddenly > deliver a NUL character instead. That's just unexpected and prone to > problems down the line. This "what you see in NOT what you get" is indeed undesirable. I'm not sure it's easy to fix in a reliable way in Emacs (beside not using `--null` as Eli points out), but I suggest you `M-x report-emacs-bug`. Maybe grep-mode can add a `filter-buffer-substring-function` that converts those NUL into `:`. For the detection of NULs in UTF-8 files, you could also ask for such a feature via `M-x report-emacs-bug` but it should be pretty easy to get something comparable with something like: (defun my-utf-8-nul-check () (save-excursion (goto-char (point-min)) (when (search-forward "\000" nil t) (error "NUL!!")))) (add-hook 'before-save-hook #'my-utf-8-nul-check) -- Stefan