From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Glenn Morris Newsgroups: gmane.emacs.bugs Subject: bug#11000: 24.0.94; Caching '--dired' is a bad idea Date: Tue, 13 Mar 2012 19:47:42 -0400 Message-ID: References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1331682491 7180 80.91.229.3 (13 Mar 2012 23:48:11 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 13 Mar 2012 23:48:11 +0000 (UTC) Cc: 11000@debbugs.gnu.org To: Leo Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Mar 14 00:48:10 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1S7bRq-0000F0-8t for geb-bug-gnu-emacs@m.gmane.org; Wed, 14 Mar 2012 00:48:10 +0100 Original-Received: from localhost ([::1]:58302 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S7bRp-0000qz-Lx for geb-bug-gnu-emacs@m.gmane.org; Tue, 13 Mar 2012 19:48:09 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:39059) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S7bRm-0000qO-7U for bug-gnu-emacs@gnu.org; Tue, 13 Mar 2012 19:48:07 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1S7bRk-0004ag-KB for bug-gnu-emacs@gnu.org; Tue, 13 Mar 2012 19:48:05 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:42626) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1S7bRk-0004aV-FS for bug-gnu-emacs@gnu.org; Tue, 13 Mar 2012 19:48:04 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1S7buk-00055w-JR for bug-gnu-emacs@gnu.org; Tue, 13 Mar 2012 20:18:02 -0400 X-Loop: help-debbugs@gnu.org In-Reply-To: Resent-From: Glenn Morris Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 14 Mar 2012 00:18:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 11000 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 11000-submit@debbugs.gnu.org id=B11000.133168427519570 (code B ref 11000); Wed, 14 Mar 2012 00:18:02 +0000 Original-Received: (at 11000) by debbugs.gnu.org; 14 Mar 2012 00:17:55 +0000 Original-Received: from localhost ([127.0.0.1]:49458 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1S7buc-00055a-8H for submit@debbugs.gnu.org; Tue, 13 Mar 2012 20:17:54 -0400 Original-Received: from fencepost.gnu.org ([208.118.235.10]:37509) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1S7buQ-00055K-Ql for 11000@debbugs.gnu.org; Tue, 13 Mar 2012 20:17:53 -0400 Original-Received: from rgm by fencepost.gnu.org with local (Exim 4.71) (envelope-from ) id 1S7bRO-0001Bf-IJ; Tue, 13 Mar 2012 19:47:42 -0400 X-Spook: mailbomb freedom Agfa Telex Chobetsu Becker FTS2000 Craig X-Ran: bTph({TCkl,3D_bmQOs.plomi'1i4d$ List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:57777 Archived-At: Leo wrote: > On 2012-03-13 00:47 +0800, Glenn Morris wrote: >> Not caching it is a worse idea. > > Could you elaborate on this point? I really would like to know. Just that it sounds very inefficient for everybody to have test what options `ls' supports on every invocation, just because you are doing something that sounds frankly rather odd. There are many places in Emacs that test for features in external commands the first time only, then make the IMO reasonable assumption that the command isn't going to change underneath. rmail-movemail-variant-in-use, find-exec-terminator, etc.