From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eric Abrahamsen Newsgroups: gmane.emacs.help Subject: Re: Persistence of variables Date: Mon, 26 Mar 2018 09:48:43 +0800 Message-ID: <874ll3bo90.fsf@ericabrahamsen.net> References: <87a7v20xlf.fsf@mbork.pl> <83a7v1lxxz.fsf@gnu.org> <87605p28ma.fsf@mbork.pl> <874ll94uvs.fsf@ericabrahamsen.net> <77e3430c-8533-4962-92fa-3b87e2226563@default> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1522028997 25613 195.159.176.226 (26 Mar 2018 01:49:57 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 26 Mar 2018 01:49:57 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Mon Mar 26 03:49:53 2018 Return-path: Envelope-to: geh-help-gnu-emacs@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 1f0HGj-0006YZ-Id for geh-help-gnu-emacs@m.gmane.org; Mon, 26 Mar 2018 03:49:53 +0200 Original-Received: from localhost ([::1]:53112 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f0HIl-0002xW-83 for geh-help-gnu-emacs@m.gmane.org; Sun, 25 Mar 2018 21:51:59 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:56463) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f0HIH-0002wz-PV for help-gnu-emacs@gnu.org; Sun, 25 Mar 2018 21:51:31 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f0HIE-0006sA-NL for help-gnu-emacs@gnu.org; Sun, 25 Mar 2018 21:51:29 -0400 Original-Received: from [195.159.176.226] (port=56781 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1f0HIE-0006ik-Ga for help-gnu-emacs@gnu.org; Sun, 25 Mar 2018 21:51:26 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1f0HG8-0005zf-CS for help-gnu-emacs@gnu.org; Mon, 26 Mar 2018 03:49:16 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 44 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:dlo+yVrFqjvyA3w11Kj51ggkZLo= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:116280 Archived-At: Drew Adams writes: >> > But no, way too heavy. I want _one variable_ to persist, and nothing >> > more. >> >> If you already use savehist-mode, you can add your variable to >> savehist-additional-variables. > > There are several possibilities, including these: > > 1. `savehist.el' (what Eric said) > 2. Customize (option value) > 3. Bookmark (e.g., Bookmark+ variable-list bookmark) > 4. Desktop > > If you only want to save one variable, just use an option. To muddy the waters further, there's also eieio-persistent: (require 'eieio-base) (defclass my-var-persister (eieio-persistent) ((directory :initarg :directory :initform "" :type string))) (setq persister (make-instance 'my-var-persister :directory "~/dir" :file "~/.emacs.d/persist")) (eieio-persistent-save persister) ;; Restart Emacs (setq persister (eieio-persistent-read "~/.emacs.d/persist")) (slot-value persister 'directory) ; "~/.dir" Probably too heavy-weight for what you're describing, but it's another option. If you ever want to save more complex data than just a single value, it's not a bad choice. Eric