From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Ted Zlatanov Newsgroups: gmane.emacs.devel Subject: lexbind: how to replace lexical-let approach to hide secrets (was: lexbind ready for merge) Date: Wed, 30 Mar 2011 08:24:46 -0500 Organization: =?utf-8?B?0KLQtdC+0LTQvtGAINCX0LvQsNGC0LDQvdC+0LI=?= @ Cienfuegos Message-ID: <87lizwd9lt.fsf_-_@lifelogs.com> References: <4D926EA9.5080509@gmail.com> <4D92AD2B.40502@gmail.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: dough.gmane.org 1301491527 30569 80.91.229.12 (30 Mar 2011 13:25:27 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 30 Mar 2011 13:25:27 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Mar 30 15:25:22 2011 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Q4vOi-0008KC-V2 for ged-emacs-devel@m.gmane.org; Wed, 30 Mar 2011 15:25:21 +0200 Original-Received: from localhost ([127.0.0.1]:43196 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q4vOi-0005Kw-BH for ged-emacs-devel@m.gmane.org; Wed, 30 Mar 2011 09:25:20 -0400 Original-Received: from [140.186.70.92] (port=58626 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q4vOY-0005Jc-JZ for emacs-devel@gnu.org; Wed, 30 Mar 2011 09:25:11 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q4vOX-00071V-FG for emacs-devel@gnu.org; Wed, 30 Mar 2011 09:25:10 -0400 Original-Received: from lo.gmane.org ([80.91.229.12]:36686) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q4vOX-00070J-9W for emacs-devel@gnu.org; Wed, 30 Mar 2011 09:25:09 -0400 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1Q4vOU-00089S-53 for emacs-devel@gnu.org; Wed, 30 Mar 2011 15:25:06 +0200 Original-Received: from 38.98.147.130 ([38.98.147.130]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 30 Mar 2011 15:25:06 +0200 Original-Received: from tzz by 38.98.147.130 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 30 Mar 2011 15:25:06 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 24 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: 38.98.147.130 X-Face: bd.DQ~'29fIs`T_%O%C\g%6jW)yi[zuz6; d4V0`@y-~$#3P_Ng{@m+e4o<4P'#(_GJQ%TT= D}[Ep*b!\e,fBZ'j_+#"Ps?s2!4H2-Y"sx" User-Agent: Gnus/5.110016 (No Gnus v0.16) Emacs/24.0.50 (gnu/linux) Cancel-Lock: sha1:VL+4nSPYsEhFGDzOBd33FBhI8rE= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 80.91.229.12 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:137909 Archived-At: On Wed, 30 Mar 2011 13:35:56 +0200 Juanma Barranquero wrote: JB> On Wed, Mar 30, 2011 at 06:10, Daniel Colascione JB> wrote: >> Even if it's not particularly common, being consistent with Common Lisp and >> having fewer special cases are good things.  Some people use constructs like >> this to create module-private variables (which is a bad idea, but that >> doesn't stop people doing it.) JB> Why a bad idea? It's a common idiom for private, persistent variables. Slightly related: auth-source.el uses `lexical-let' to define lambda accessors for secrets (so printing them, for instance, won't show a password). Will the secrets still be hidden in the lexbind branch? And is there a smarter way to do it? Sample code: (let ((data "my secret")) (lexical-let ((data data)) (lambda () data))) Thanks Ted