From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: RFC: String interpolation Date: Tue, 13 Dec 2016 10:05:42 -0800 Organization: UCLA Computer Science Department Message-ID: <4e9c0a7e-2d44-5fc7-79d8-7b19758fef01@cs.ucla.edu> References: <51825111-ace4-f750-4077-026a3b648d27@gmail.com> <8737hwnc52.fsf@lifelogs.com> <8c117f5c-209a-97d8-79ce-a78f707f0545@gmail.com> <76c9c475-0180-aa49-3d4a-006d4e3f943c@gmail.com> <89a6a20d-e135-caad-6b31-760ab7ac90fc@cs.ucla.edu> <87fultkjte.fsf@lifelogs.com> <3ff9e7e4-aee7-191e-5e3b-4d4ac0006a1f@cs.ucla.edu> <9e138d20-782d-2a56-75f8-37e3fa1885df@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1481652366 27360 195.159.176.226 (13 Dec 2016 18:06:06 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 13 Dec 2016 18:06:06 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 Cc: larsi@gnus.org, emacs-devel@gnu.org To: rms@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Dec 13 19:06:03 2016 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cGrSe-0005yZ-CN for ged-emacs-devel@m.gmane.org; Tue, 13 Dec 2016 19:05:56 +0100 Original-Received: from localhost ([::1]:39879 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cGrSi-0002PG-Mp for ged-emacs-devel@m.gmane.org; Tue, 13 Dec 2016 13:06:00 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:36932) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cGrSc-0002P9-Pz for emacs-devel@gnu.org; Tue, 13 Dec 2016 13:05:55 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cGrSY-0002O6-Po for emacs-devel@gnu.org; Tue, 13 Dec 2016 13:05:54 -0500 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:35416) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cGrSY-0002Nc-Jq; Tue, 13 Dec 2016 13:05:50 -0500 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 31E31160083; Tue, 13 Dec 2016 10:05:49 -0800 (PST) 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 SJQXqRLDdN2a; Tue, 13 Dec 2016 10:05:47 -0800 (PST) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id DFF15160084; Tue, 13 Dec 2016 10:05:47 -0800 (PST) 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 Lcnspo16sHDa; Tue, 13 Dec 2016 10:05:47 -0800 (PST) Original-Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id C45DF160083; Tue, 13 Dec 2016 10:05:47 -0800 (PST) In-Reply-To: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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:210410 Archived-At: On 12/13/2016 09:42 AM, Richard Stallman wrote: > We have seen various proposals for what string interpolation should do. > What spec does your patch implement? It implements Lars's proposal here: http://lists.gnu.org/archive/html/emacs-devel/2016-12/msg00504.html His example: (format "Altitude= %.2f%" (+ alt 100) ", direction = %.2f%" (- dir) ".") might generate: "Altitude= 400.57, direction = -240.93." The idea is that if a format string's first conversion specifier is followed by "%" and end-of-string, the value to be formatted is followed by another format string that continues the first string. This is an extension to the current behavior of 'format', where the trailing "%" is an error. Similar rules apply to other formatting functions like 'message'. For example, this code in org-clock.el: (message (concat "Clock stopped at %s after " (org-minutes-to-clocksum-string (+ (* 60 h) m)) "%s") te (if remove " => LINE REMOVED" "")) could be rewritten this way: (message "Clock stopped at %s%" te " after %s%" (org-minutes-to-clocksum-string (+ (* 60 h) m)) "%s" (if remove " => LINE REMOVED" ""))