From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89C79C43460 for ; Fri, 14 May 2021 09:06:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 60FA061406 for ; Fri, 14 May 2021 09:06:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233763AbhENJHX (ORCPT ); Fri, 14 May 2021 05:07:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230525AbhENJHW (ORCPT ); Fri, 14 May 2021 05:07:22 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD7B5C061574; Fri, 14 May 2021 02:06:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=wJ/s2QfMNTOyTmAVrtCY2CXjxIzIo3n63jc+NCKOLVA=; b=qSdZ8XEu7oRfN3BBgzEHopiTqS jG82n131hUCIcPhL/w7BpeBcjIKG4Se8cut+H2eYH3uOfbcNc7XGdGIVO0uSQfx4iK4PzAeAUbF47 s4NeyxYEZrokaZG8vXvllhAVi13S8TKrRyssrgAp/z1xL56gQXAHbyDmNqp2B+nCcPBR4b3vKKP/6 WZap8/pZ+M0Fu6/S+LcKQXTZOBM21oBFJBC6bs4YY8zXYLoGfBXcTU+OOoEdKTC+f8945eYS5r8vY zeI/I13z7D3mRVVokdlbY8t5yWaIvIxQI9QWgqVafmOYRy9Cc/IPb3MSh4WbRqO6atJAiwzvd5UcX 0kfhSlGA==; Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=iad7-dhcp-95-145-115.iad7.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lhTln-00BqP5-JN; Fri, 14 May 2021 09:06:08 +0000 Message-ID: <61c286b7afd6c4acf71418feee4eecca2e6c80c8.camel@infradead.org> Subject: Re: [PATCH v2 00/40] Use ASCII subset instead of UTF-8 alternate symbols From: David Woodhouse To: Mauro Carvalho Chehab Cc: Linux Doc Mailing List , linux-kernel@vger.kernel.org, Jonathan Corbet , Mali DP Maintainers , alsa-devel@alsa-project.org, coresight@lists.linaro.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-wired-lan@lists.osuosl.org, keyrings@vger.kernel.org, kvm@vger.kernel.org, linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-edac@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, linux-integrity@vger.kernel.org, linux-media@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-rdma@vger.kernel.org, linux-sgx@vger.kernel.org, linux-usb@vger.kernel.org, mjpeg-users@lists.sourceforge.net, netdev@vger.kernel.org, rcu@vger.kernel.org Date: Fri, 14 May 2021 10:06:01 +0100 In-Reply-To: <20210514102118.1b71bec3@coco.lan> References: <20210514102118.1b71bec3@coco.lan> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-yaWQTSPMGuNj6joXfKRG" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org --=-yaWQTSPMGuNj6joXfKRG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-05-14 at 10:21 +0200, Mauro Carvalho Chehab wrote: > Em Wed, 12 May 2021 18:07:04 +0100 > David Woodhouse escreveu: >=20 > > On Wed, 2021-05-12 at 14:50 +0200, Mauro Carvalho Chehab wrote: > > > Such conversion tools - plus some text editor like LibreOffice or si= milar - have > > > a set of rules that turns some typed ASCII characters into UTF-8 alte= rnatives, > > > for instance converting commas into curly commas and adding non-break= able > > > spaces. All of those are meant to produce better results when the tex= t is > > > displayed in HTML or PDF formats. =20 > >=20 > > And don't we render our documentation into HTML or PDF formats?=20 >=20 > Yes. >=20 > > Are > > some of those non-breaking spaces not actually *useful* for their > > intended purpose? >=20 > No. >=20 > The thing is: non-breaking space can cause a lot of problems. >=20 > We even had to disable Sphinx usage of non-breaking space for > PDF outputs, as this was causing bad LaTeX/PDF outputs. >=20 > See, commit: 3b4c963243b1 ("docs: conf.py: adjust the LaTeX document outp= ut") >=20 > The afore mentioned patch disables Sphinx default behavior of > using NON-BREAKABLE SPACE on literal blocks and strings, using this > special setting: "parsedliteralwraps=3Dtrue". >=20 > When NON-BREAKABLE SPACE were used on PDF outputs, several parts of=20 > the media uAPI docs were violating the document margins by far, > causing texts to be truncated. >=20 > So, please **don't add NON-BREAKABLE SPACE**, unless you test > (and keep testing it from time to time) if outputs on all > formats are properly supporting it on different Sphinx versions. And there you have a specific change with a specific fix. Nothing to do with whether NON-BREAKABLE SPACE is =E2=88=89 ASCII, and *certainly* nothin= g to do with the fact that, like *every* character in every kernel file except the *binary* files, it's representable in UTF-8. By all means fix the specific characters which are typographically wrong or which, like NON-BREAKABLE SPACE, cause problems for rendering the documentation. > Also, most of those came from conversion tools, together with other > eccentricities, like the usage of U+FEFF (BOM) character at the > start of some documents. The remaining ones seem to came from=20 > cut-and-paste. ... or which are just entirely redundant and gratuitous, like a BOM in an environment where all files are UTF-8 and never 16-bit encodings anyway. > > > While it is perfectly fine to use UTF-8 characters in Linux, and spec= ially at > > > the documentation, it is better to stick to the ASCII subset on su= ch > > > particular case, due to a couple of reasons: > > >=20 > > > 1. it makes life easier for tools like grep; =20 > >=20 > > Barely, as noted, because of things like line feeds. >=20 > You can use grep with "-z" to seek for multi-line strings(*), Like: >=20 > $ grep -Pzl 'grace period started,\s*then' $(find Documentation/ -type f= ) > Documentation/RCU/Design/Data-Structures/Data-Structures.rst Yeah, right. That works if you don't just use the text that you'll have seen in the HTML/PDF "grace period started, then", and if you instead craft a *regex* for it, replacing the spaces with '\s*'. Or is that [[:space:]]* if you don't want to use the experimental Perl regex feature? $ grep -zlr 'grace[[:space:]]\+period[[:space:]]\+started,[[:space:]]\+the= n' Documentation/RCU Documentation/RCU/Design/Data-Structures/Data-Structures.rst And without '-l' it'll obviously just give you the whole file. No '-A5 -B5' to see the surroundings... it's hardly a useful thing, is it? > (*) Unfortunately, while "git grep" also has a "-z" flag, it > seems that this is (currently?) broken with regards of handling multi= lines: >=20 > $ git grep -Pzl 'grace period started,\s*then' > $ Even better. So no, multiline grep isn't really a commonly usable feature at all. This is why we prefer to put user-visible strings on one line in C source code, even if it takes the lines over 80 characters =E2=80=94 to all= ow for grep to find them. > > > 2. they easier to edit with the some commonly used text/source > > > code editors. =20 > >=20 > > That is nonsense. Any but the most broken and/or anachronistic > > environments and editors will be just fine. >=20 > Not really. >=20 > I do use a lot of UTF-8 here, as I type texts in Portuguese, but I rely > on the US-intl keyboard settings, that allow me to type as "'a" for =C3= =A1. > However, there's no shortcut for non-Latin UTF-codes, as far as I know. >=20 > So, if would need to type a curly comma on the text editors I normally= =20 > use for development (vim, nano, kate), I would need to cut-and-paste > it from somewhere[1]. That's entirely irrelevant. You don't need to be able to *type* every character that you see in front of you, as long as your editor will render it correctly and perhaps let you cut/paste it as you're editing the document if you're moving things around. > [1] If I have a table with UTF-8 codes handy, I could type the UTF-8=20 > number manually... However, it seems that this is currently broken= =20 > at least on Fedora 33 (with Mate Desktop and US intl keyboard with= =20 > dead keys). >=20 > Here, U is not working. No idea why. I haven't=20 > test it for *years*, as I din't see any reason why I would > need to type UTF-8 characters by numbers until we started > this thread. Please provide the bug number for this; I'd like to track it. > But even in the best case scenario where I know the UTF-8 and > U works, if I wanted to use, for instance, a curly > comma, the keystroke sequence would be: >=20 > U201csome stringU201d >=20 > That's a lot harder than typing and has a higher chances of > mistakenly add a wrong symbol than just typing: >=20 > "some string" >=20 > Knowing that both will produce *exactly* the same output, why > should I bother doing it the hard way? Nobody's asked you to do it the "hard way". That's completely irrelevant to the discussion we were having. > Now, I'm not arguing that you can't use whatever UTF-8 symbol you > want on your docs. I'm just saying that, now that the conversion=20 > is over and a lot of documents ended getting some UTF-8 characters > by accident, it is time for a cleanup. All text documents are *full* of UTF-8 characters. If there is a file in the source code which has *any* non-UTF8, we call that a 'binary file'. Again, if you want to make specific fixes like removing non-breaking spaces and byte order marks, with specific reasons, then those make sense. But it's got very little to do with UTF-8 and how easy it is to type them. 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