From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: encode-time vs decode-time Date: Sat, 17 Aug 2019 02:25:48 -0700 Organization: UCLA Computer Science Department Message-ID: <47b9fb2f-3ae6-14d3-5f68-7dda13d92e5d@cs.ucla.edu> References: <502b23f8-58ed-38ff-ae50-fae391129a10@cs.ucla.edu> <87v9viuivo.fsf@mouse.gnus.org> <87o9119p8i.fsf@mouse.gnus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="80269"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 Cc: Andy Moreton , emacs-devel@gnu.org To: Lars Ingebrigtsen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Aug 17 11:26:25 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hyuyf-000Kkz-2i for ged-emacs-devel@m.gmane.org; Sat, 17 Aug 2019 11:26:25 +0200 Original-Received: from localhost ([::1]:35120 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hyuyd-0003ro-BK for ged-emacs-devel@m.gmane.org; Sat, 17 Aug 2019 05:26:23 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52520) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hyuy9-0003rT-B8 for emacs-devel@gnu.org; Sat, 17 Aug 2019 05:25:54 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hyuy8-0002gm-Ap for emacs-devel@gnu.org; Sat, 17 Aug 2019 05:25:53 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:46500) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hyuy8-0002g1-5Y for emacs-devel@gnu.org; Sat, 17 Aug 2019 05:25:52 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 5BFA9162714; Sat, 17 Aug 2019 02:25:50 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id B0G46sSl50Jx; Sat, 17 Aug 2019 02:25:49 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 81B0316278A; Sat, 17 Aug 2019 02:25:49 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id qCneaQ_jCose; Sat, 17 Aug 2019 02:25:49 -0700 (PDT) Original-Received: from [192.168.1.9] (cpe-23-242-74-103.socal.res.rr.com [23.242.74.103]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 48765162714; Sat, 17 Aug 2019 02:25:49 -0700 (PDT) In-Reply-To: <87o9119p8i.fsf@mouse.gnus.org> Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 131.179.128.68 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:239404 Archived-At: Lars Ingebrigtsen wrote: > I thought it would be good to introduce a new function, say > `get-current-time', that could have our new signature. We'd then > deprecate `current-time' It's not just current-time; it's also encode-time, file-attributes, directory-files-and-attributes, visited-file-modtime, current-idle-time, process-attributes, get-internal-run-time, make-frame-visible, time-add, time-subtract, and no doubt other primitives written in C that make Lisp timestamps visible to user code, along with the many functions written in Lisp (e.g., time-since) that call these primitives and give Lisp timestamps to users. We'd have to come up with new names for all these functions, and all the user-visible variables these functions store into, and deprecate all the old names. And during this deprecation period, Emacs-defined and user-defined code would have to support both old- and new-format timestamps since code could generate either. Of course it would be possible but it'll be easier for everyone concerned if we just bite the bullet at some point - not in the next version of course, but eventually, with an option to not-bite-the-bullet-quite-yet for people who need that option.