From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS4713 221.184.0.0/13 X-Spam-Status: No, score=-4.0 required=3.0 tests=AWL,BAYES_00, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from neon.ruby-lang.org (neon.ruby-lang.org [221.186.184.75]) by dcvr.yhbt.net (Postfix) with ESMTP id AC2911F461 for ; Mon, 19 Aug 2019 09:12:37 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 73F1212097F; Mon, 19 Aug 2019 18:12:29 +0900 (JST) Received: from o1678948x4.outbound-mail.sendgrid.net (o1678948x4.outbound-mail.sendgrid.net [167.89.48.4]) by neon.ruby-lang.org (Postfix) with ESMTPS id 950C012097F for ; Mon, 19 Aug 2019 18:12:26 +0900 (JST) Received: by filter0155p3mdw1.sendgrid.net with SMTP id filter0155p3mdw1-29307-5D5A67FB-3A 2019-08-19 09:12:27.767844693 +0000 UTC m=+142616.848943087 Received: from herokuapp.com (unknown [54.80.45.23]) by ismtpd0010p1iad1.sendgrid.net (SG) with ESMTP id _dRYIZAUTpCpdX7uzIH4ZQ for ; Mon, 19 Aug 2019 09:12:27.745 +0000 (UTC) Date: Mon, 19 Aug 2019 09:12:27 +0000 (UTC) From: shyouhei@ruby-lang.org Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 69979 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 16112 X-Redmine-Issue-Author: k0kubun X-Redmine-Sender: shyouhei X-Mailer: Redmine X-Redmine-Host: bugs.ruby-lang.org X-Redmine-Site: Ruby Issue Tracking System X-Auto-Response-Suppress: All Auto-Submitted: auto-generated X-SG-EID: =?us-ascii?Q?jcfQDMoo=2FMGCmP3uu1SeyLQUxUPXq5PjHpHz3xSFn15Q00E5r6exO5wIZxOls6?= =?us-ascii?Q?MYQgsWhypcol6sX5GrDvfeL69afKeyh=2FOiPMvZj?= =?us-ascii?Q?0Fhd5KtK617wdSybt4B77XXKJypmC0eI32xw4Aq?= =?us-ascii?Q?WkK=2FDMAUwfhEQvN57V4LonIw9l5S59VyuW+2QAs?= =?us-ascii?Q?=2Fdyszmx1AuGwpRuf2NdPv3BxMiXu71qYB6A=3D=3D?= To: ruby-core@ruby-lang.org X-ML-Name: ruby-core X-Mail-Count: 94431 Subject: [ruby-core:94431] [Ruby master Misc#16112] Reduce the possibility of "expand tabs" commit occurrences X-BeenThere: ruby-core@ruby-lang.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Ruby developers List-Id: Ruby developers List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ruby-core-bounces@ruby-lang.org Sender: "ruby-core" Issue #16112 has been updated by shyouhei (Shyouhei Urabe). Option 4 is not a lethal tab killer, but nevertheless a good thing to have. ---------------------------------------- Misc #16112: Reduce the possibility of "expand tabs" commit occurrences https://bugs.ruby-lang.org/issues/16112#change-80856 * Author: k0kubun (Takashi Kokubun) * Status: Open * Priority: Normal * Assignee: ---------------------------------------- ## Problem * While we agreed to use only spaces for indentation in [Bug #14246], we sometimes hit "expand tabs" commit when we just edit a part of existing lines with hard tab indentation. * "expand tabs" commit bothers people when we need to perform a revert or a backport. * However, because [Bug #14246] aimed to eventually make indentations consistent, we do not want to just drop "expand tabs". * One of the motivations to solve [Bug #14246] is that having hard tabs makes preprocessed MJIT header ugly and it makes debugging on GCC hard. As MJIT may introduce C-code inlining for sources outside vm.c in the future, we want to fix the issue in almost all sources which can be run on runtime. ## Possible Solutions There would be some options to approach the problem. I'd like to hear opinions about these options. 1. Expand all tabs at once for all files managed by auto-style. * In [Bug #14246], this was clearly objected for the reason "Indents should become consistent over time". * In my understanding, not folliwng "Indents should become consistent over time" would be problematic mainly for polluting "git blame" and conflicts on backport. * For the first point, we can use `-w` option of `git blame` to ignore that. * For backport, it's a trade-off with many "expand tabs" commits. We need opinions about this from @usa and @nagachika . * Also reverting a commit before the commit expanding all tabs would be bothering, for a short while. 2. Skip expand tabs for existing lines when indentation is not changed, and expand tabs only in newly-added lines. * If editors are configured properly, "expand tabs" would not happen for new patches in this approach. * Even in this approach, at least we will not go to the opposite direction of eventually achieving [Bug #14246]. So it seems acceptable. 3. Prepare a local pre-commit hook to perform "expand tabs", and let people who do not want "expand tabs" use it. 4. Make pull request CI fail when there's diff to be expanded, and let people who do not want "expand tabs" commit things from pull requests. -- https://bugs.ruby-lang.org/