From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Gnus: caching message headers? Date: Mon, 07 Sep 2020 17:50:02 +0000 Message-ID: References: <874ko9sgcn.fsf@ericabrahamsen.net> <87v9gpqyir.fsf@ericabrahamsen.net> Reply-To: Gregory Heytings Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=US-ASCII Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20558"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Alpine 2.22 (NEB 394 2020-01-19) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Sep 07 19:50:52 2020 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 1kFLI4-0005GQ-F4 for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 07 Sep 2020 19:50:52 +0200 Original-Received: from localhost ([::1]:35578 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kFLI3-0004Io-I5 for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 07 Sep 2020 13:50:51 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35394) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kFLHQ-00044b-BS for help-gnu-emacs@gnu.org; Mon, 07 Sep 2020 13:50:12 -0400 Original-Received: from mx.sdf.org ([205.166.94.24]:60194) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kFLHO-0000UX-7c for help-gnu-emacs@gnu.org; Mon, 07 Sep 2020 13:50:12 -0400 Original-Received: from sdf.org (IDENT:ghe@faeroes.freeshell.org [205.166.94.9]) by mx.sdf.org (8.15.2/8.14.5) with ESMTPS id 087Ho55p024575 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits) verified NO); Mon, 7 Sep 2020 17:50:05 GMT Original-Received: (from ghe@localhost) by sdf.org (8.15.2/8.12.8/Submit) id 087HoFVi009590; Mon, 7 Sep 2020 17:50:15 GMT In-Reply-To: <87v9gpqyir.fsf@ericabrahamsen.net> Received-SPF: pass client-ip=205.166.94.24; envelope-from=ghe@sdf.org; helo=mx.sdf.org X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/07 11:23:37 X-ACL-Warn: Detected OS = ??? X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham 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:123986 Archived-At: >> I'm clearly not an expert, but would it not be enough to save and >> retrieve the contents of nntp-server-buffer in nnimap-retrieve-headers? >> Or are you thinking about a more generic solution that would work with >> all backends? > > We could do something ad-hoc for nnimap, but yes I'm thinking of > something more generic. All the header data (what's used to create the > Summary display) is held in variables that are local to the Summary > buffer, so in principle there's no reason we couldn't just leave the > local data in place when we leave the buffer. There are plenty of > obstacles to making it work correctly, but in principle I don't see why > not. > I would be happy with an ad-hoc solution for nnimap, which I suppose is the most used backend these days (but I could be wrong). In fact I wasn't thinking of just leaving the local data in place when the summary buffer is left (which could eat a lot of memory), but instead to store them permanently in a cache on disk, and to read that file again instead of doing a "UID FETCH" on the server.