From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Juri Linkov Newsgroups: gmane.emacs.devel Subject: Re: vc-find-revision-no-save? Date: Mon, 24 Oct 2022 22:37:48 +0300 Organization: LINKOV.NET Message-ID: <86h6zt812r.fsf@mail.linkov.net> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29707"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu) Cc: Emacs developers To: John Yates Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Oct 24 21:53:07 2022 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 1on3VQ-0007YX-No for ged-emacs-devel@m.gmane-mx.org; Mon, 24 Oct 2022 21:53:04 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1on3Qf-0002nj-BE; Mon, 24 Oct 2022 15:48:09 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1on3Qd-0002mS-CT for emacs-devel@gnu.org; Mon, 24 Oct 2022 15:48:07 -0400 Original-Received: from relay10.mail.gandi.net ([2001:4b98:dc4:8::230]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1on3QU-0004ED-Qw for emacs-devel@gnu.org; Mon, 24 Oct 2022 15:48:07 -0400 Original-Received: (Authenticated sender: juri@linkov.net) by mail.gandi.net (Postfix) with ESMTPSA id 88B91240004; Mon, 24 Oct 2022 19:47:52 +0000 (UTC) In-Reply-To: (John Yates's message of "Sun, 23 Oct 2022 20:27:24 -0400") Received-SPF: pass client-ip=2001:4b98:dc4:8::230; envelope-from=juri@linkov.net; helo=relay10.mail.gandi.net X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: "Emacs-devel" Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:298415 Archived-At: > vc.el contains the following defcustom: > > (defcustom vc-find-revision-no-save nil > "If non-nil, `vc-find-revision' doesn't write > the created buffer to file." > :type 'boolean > :version "27.1") > > Notice that the default is nil. What is the logic in allowing an > historic revision to be associated with a file? Why is it not merely > a readonly buffer with no backing file? The default value is nil just to keep its previous default behaviour. I don't know why previously it saved every visited revision to a file, thus littering the source directories with useless files. > Perhaps I have been too influenced by git... My mental model is that > revisions are immutable _values_. Is that not vc's model? I don't know a reason why anyone might want to edit an old revision. But anyway when one needs to save a revision to file, it's easy to do with 'C-x C-w RET', when the default value will be changed to t.