From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: How to store list of variable values into another dynamically created variables Date: Tue, 05 Jan 2021 14:38:34 -0500 Message-ID: References: <86turvqm1b.fsf@x201.butler.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="38193"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:mRgA/CIS85vKuHiuQE/hym0AsKk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jan 05 20:39:07 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kwsAc-0009qN-Kw for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 05 Jan 2021 20:39:06 +0100 Original-Received: from localhost ([::1]:60146 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kwsAb-00040R-JH for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 05 Jan 2021 14:39:05 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50352) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kwsAE-00040I-Bl for help-gnu-emacs@gnu.org; Tue, 05 Jan 2021 14:38:42 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:56344) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kwsAC-0004dX-TV for help-gnu-emacs@gnu.org; Tue, 05 Jan 2021 14:38:42 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kwsAA-0009KD-NW for help-gnu-emacs@gnu.org; Tue, 05 Jan 2021 20:38:38 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:127002 Archived-At: > Your save and restore functions are then dead easy: > > #+begin_src emacs-lisp > (defun mu4e-save (l) > (mapcar (lambda(x) (set (cdr x) (symbol-value (car x)))) l)) > > (defun mu4e-restore (l) > (let ((lrev (mapcar (lambda(x) (cons (cdr x) (car x))) l))) > (mu4e-save lrev))) FWIW, in most of the minor modes where I've needed such a thing, I found it more convenient to use a single "save" variable, e.g. something like: (defvar FOO--saved-vals nil) (define-minor-mode FOO-mode "blabla FOO blabla" ;; Revert to original values. (dolist (x (prog1 FOO--saved-vals (setq FOO--saved-vals nil))) (if (consp x) (set (car x) (cdr x)) (mkunbound x))) ;; Set minor mode's values. (when FOO-mode (setq FOO--saved-vals (mapcar (lambda (v) (if (boundp v) (cons v (symbol-value v)) v)) '(mu4e-headers-seen-mark ... mu4e-headers-duplicate-prefix))) ..etc..)) -- Stefan