From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tim Landscheidt Newsgroups: gmane.emacs.help Subject: Doing something different for the last element of a sequence (partition)? Date: Mon, 16 Nov 2020 10:28:52 +0000 Organization: http://www.tim-landscheidt.de/ Message-ID: <87ft59egt7.fsf@passepartout.tim-landscheidt.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37379"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:icH9pMdWStn1qHr0bkFDXtQDbx0= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Nov 16 11:29:51 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 1keblf-0009dP-Ca for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 11:29:51 +0100 Original-Received: from localhost ([::1]:58178 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1keble-0003DX-Eq for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 05:29:50 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55644) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kebku-0003Ca-1n for help-gnu-emacs@gnu.org; Mon, 16 Nov 2020 05:29:04 -0500 Original-Received: from static.214.254.202.116.clients.your-server.de ([116.202.254.214]:35372 helo=ciao.gmane.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kebks-0003SD-6Y for help-gnu-emacs@gnu.org; Mon, 16 Nov 2020 05:29:03 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kebkn-0008Uv-Dj for help-gnu-emacs@gnu.org; Mon, 16 Nov 2020 11:28:57 +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-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/16 05:28:58 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, 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:125280 Archived-At: Hi, I have a list of URLs (all-urls) and I want to launch a Firefox window for the first x URLs, then wait y seconds, then launch another one, etc., and then prompt the user if the source of URLs can be deleted (provided that everything went smoothly). If I do: | (seq-doseq (firefox-urls (seq-partition (seq-sort all-urls #'string<) x)) | (apply 'call-process "firefox" nil "*firefox*" nil firefox-urls) | (sleep-for y)) that works fine, except that it also waits for y seconds af- ter the last launch. Looking at seq's toolbox, it seems to me that the only way to avoid that last sleep would be: - seq-sort the URLs alphabetically, - then seq-partition, - then seq-reverse, - then use seq-map-indexed to add the indexes to the subse- quences in a kind of Schwartzian transform, marking the logically last partition with the index 0, - then seq-reverse, - then seq-doseq and sleep only if the index is not 0. Ugh. Is there something I missed? Some form of mapconcat that accepts a function as separator? Tim