From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Juri Linkov Newsgroups: gmane.emacs.bugs Subject: bug#4136: 23.1; delete-pair Date: Sun, 16 Aug 2009 02:06:06 +0300 Organization: JURTA Message-ID: <87ab20znhd.fsf@mail.jurta.org> References: <19075.45378.67131.491453@winooski.ccs.neu.edu> <4A83E299.3060002@gmx.at> <87tz0bqqhm.fsf@mail.jurta.org> <4A850F6C.2080205@gmx.at> <873a7uc8mg.fsf@mail.jurta.org> <87eirfs56q.fsf@mail.jurta.org> <19076.47996.128071.281272@winooski.ccs.neu.edu> <87pray9ezq.fsf@mail.jurta.org> <19078.4981.525959.210519@winooski.ccs.neu.edu> Reply-To: Juri Linkov , 4136@emacsbugs.donarmstrong.com NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1250380094 26363 80.91.229.12 (15 Aug 2009 23:48:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 15 Aug 2009 23:48:14 +0000 (UTC) Cc: 4136@emacsbugs.donarmstrong.com To: Eli Barzilay Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Aug 16 01:48:07 2009 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1McSyj-0002lh-1v for geb-bug-gnu-emacs@m.gmane.org; Sun, 16 Aug 2009 01:48:05 +0200 Original-Received: from localhost ([127.0.0.1]:42897 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1McSyi-0003NS-Hn for geb-bug-gnu-emacs@m.gmane.org; Sat, 15 Aug 2009 19:48:04 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1McSxg-0002gx-Vg for bug-gnu-emacs@gnu.org; Sat, 15 Aug 2009 19:47:01 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1McSxb-0002ee-5a for bug-gnu-emacs@gnu.org; Sat, 15 Aug 2009 19:47:00 -0400 Original-Received: from [199.232.76.173] (port=52105 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1McSxa-0002eC-FS for bug-gnu-emacs@gnu.org; Sat, 15 Aug 2009 19:46:54 -0400 Original-Received: from rzlab.ucr.edu ([138.23.92.77]:51624) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1McSxZ-0004e9-Gu for bug-gnu-emacs@gnu.org; Sat, 15 Aug 2009 19:46:53 -0400 Original-Received: from rzlab.ucr.edu (rzlab.ucr.edu [127.0.0.1]) by rzlab.ucr.edu (8.14.3/8.14.3/Debian-5) with ESMTP id n7FNknFE010160; Sat, 15 Aug 2009 16:46:51 -0700 Original-Received: (from debbugs@localhost) by rzlab.ucr.edu (8.14.3/8.14.3/Submit) id n7FNU85G007472; Sat, 15 Aug 2009 16:30:08 -0700 X-Loop: owner@emacsbugs.donarmstrong.com Resent-From: Juri Linkov Resent-To: bug-submit-list@donarmstrong.com Resent-CC: Emacs Bugs Resent-Date: Sat, 15 Aug 2009 23:30:08 +0000 Resent-Message-ID: Resent-Sender: owner@emacsbugs.donarmstrong.com X-Emacs-PR-Message: followup 4136 X-Emacs-PR-Package: emacs X-Emacs-PR-Keywords: Original-Received: via spool by 4136-submit@emacsbugs.donarmstrong.com id=B4136.12503786076348 (code B ref 4136); Sat, 15 Aug 2009 23:30:08 +0000 Original-Received: (at 4136) by emacsbugs.donarmstrong.com; 15 Aug 2009 23:23:27 +0000 X-Spam-Bayes: score:0.5 Bayes not run. spammytokens:Tokens not available. hammytokens:Tokens not available. Original-Received: from mx1.starman.ee (smtp-out1.starman.ee [85.253.0.3]) by rzlab.ucr.edu (8.14.3/8.14.3/Debian-5) with ESMTP id n7FNNPhh006338 for <4136@emacsbugs.donarmstrong.com>; Sat, 15 Aug 2009 16:23:26 -0700 X-Virus-Scanned: by Amavisd-New at mx1.starman.ee Original-Received: from mail.starman.ee (82.131.53.206.cable.starman.ee [82.131.53.206]) by mx1.starman.ee (Postfix) with ESMTP id 3E2293F434B; Sun, 16 Aug 2009 02:23:19 +0300 (EEST) In-Reply-To: <19078.4981.525959.210519@winooski.ccs.neu.edu> (Eli Barzilay's message of "Fri, 14 Aug 2009 21:46:29 -0400") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.50 (x86_64-pc-linux-gnu) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 2) Resent-Date: Sat, 15 Aug 2009 19:47:00 -0400 X-BeenThere: bug-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:30243 Archived-At: >> It seems you and Martin prefer checking against the >> `insert-pair-alist' because the function name `delete-pair' suggests >> it should be a counterpart of `insert-pair'. > > ...this is exactly the issue: it is much better if `delete-foo' is > always an operation that reverts what `insert-foo' does. The exact reverse is impossible. For instance, put the cursor on the letter `f' in: foo "" bar and type `M-3 M-"' where M-" is bound to `insert-pair'. The result will be: "foo "" bar" Now what `delete-pair' should do to revert this back to the original? > The current state of `delete-pair' is so bad that my guess is that > hardly anyone used it, so adding another command doesn't make much > sense. How about making it do the proper thing (removing only > balanced pairs as specified by `insert-pair-alist'), and ignoring > errors with a prefix argument? I've been using `delete-pair' for many years several times a day without any problem because my lists are always correctly balanced thanks to `insert-pair' that I exclusively use to create balanced lists and strings. That's why even in the current state of `delete-pair' it is the useful reverse of `insert-pair' because the latter creates balanced lists and the former deletes them. >> This is fixed in the following version: >> [...] > > This version doesn't make much sense as an operation you'd want to do > on code: > > (foo '(x y z)) > --> > (foo 'x y z) It makes sense when `foo' is a multi-argument function like `list', e.g. (list 'x y z) So I see no reason to introduce more restrictions to decide what parens the user is allowed to delete in his/her code. -- Juri Linkov http://www.jurta.org/emacs/