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: Re: Doing something different for the last element of a sequence (partition)? Date: Mon, 16 Nov 2020 11:40:37 +0000 Organization: http://www.tim-landscheidt.de/ Message-ID: <878sb1edhm.fsf@passepartout.tim-landscheidt.de> References: <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="39038"; 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:V8YjAYn6r1K2LIEbKH5dWWRLyHE= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Nov 16 12:42:03 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 1kectW-000A4j-TL for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 12:42:02 +0100 Original-Received: from localhost ([::1]:44240 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kectW-0006LZ-0E for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 16 Nov 2020 06:42:02 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48812) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kecsI-0005uR-Vf for help-gnu-emacs@gnu.org; Mon, 16 Nov 2020 06:40:46 -0500 Original-Received: from static.214.254.202.116.clients.your-server.de ([116.202.254.214]:34402 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 1kecsH-0004Vr-8e for help-gnu-emacs@gnu.org; Mon, 16 Nov 2020 06:40:46 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kecsE-0008P4-6E for help-gnu-emacs@gnu.org; Mon, 16 Nov 2020 12:40:42 +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:125282 Archived-At: 2QdxY4RzWzUUiLuE@potatochowder.com wrote: >> 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. > Or handle the first one as the special case (completely untested): > (cl-do (((firefox-urls (seq-partition (seq-sort all-urls #'string<) x)) > (delay 0 y))) > (sleep-for delay) > (apply 'call-process "firefox" nil "*firefox*" nil firefox-urls)) Inspiration! I initially looked at seq-reduce, but dismiss- ed it because I was focussing on the /last/ partition. But it is rather simple: | (let | ((all-urls (mapcar 'number-to-string (number-sequence 1 25)))) | (message "all-urls = %S" all-urls) | (seq-reduce | (lambda (not-first-call firefox-urls) | (if not-first-call | (message "Would sleep")) | (message "firefox-urls = %S" firefox-urls) | t) ;; Set not-first-call for subsequent calls. | (seq-partition (seq-sort #'string< all-urls) 3) | nil)) Thanks! Tim