From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: avoid narrow-to-region (was: Re: replace-regexp) Date: Sun, 09 May 2021 14:43:40 +0200 Message-ID: <87czu02i2r.fsf@zoho.eu> References: <87tunf1mz5.fsf@zoho.eu> <87v97v6mxg.fsf@gnu.org> <87wnsaz9df.fsf@zoho.eu> <877dkaytwu.fsf@zoho.eu> <87eeegx25w.fsf_-_@zoho.eu> <87fsywtp3f.fsf@zoho.eu> <87bl9ktms2.fsf@zoho.eu> <875yzsrxd9.fsf@zoho.eu> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="10460"; 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:/UsLAM/sTqv9yxeNicJyKWLkmng= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun May 09 14:44:31 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 1lfinP-0002bt-G1 for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 09 May 2021 14:44:31 +0200 Original-Received: from localhost ([::1]:52426 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lfinO-0005Jx-07 for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 09 May 2021 08:44:30 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49816) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfimk-0005Jh-N3 for help-gnu-emacs@gnu.org; Sun, 09 May 2021 08:43:50 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:43764) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfimj-0004x4-44 for help-gnu-emacs@gnu.org; Sun, 09 May 2021 08:43:50 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lfimh-0001im-5z for help-gnu-emacs@gnu.org; Sun, 09 May 2021 14:43:47 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never 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:129614 Archived-At: Yuri Khan wrote: > (defun yk-shuffle-lines (begin end) > "Reorder lines between BEGIN and END randomly. > If BEGIN or END is in the middle of a line, that line is included. > Any markers inside the region may move > to the beginning or end of their respective lines, > and won’t follow the text they were associated with." > (interactive "*r") > (save-excursion > (let ((nlines (count-lines begin end))) > (goto-char begin) > (while (> nlines 1) > (let* ((begin1 (line-beginning-position)) > (line1 (let ((end1 (line-end-position))) > (prog1 (buffer-substring begin1 end1) > (delete-region begin1 end1)))) > (_ (forward-line (random nlines))) > (line2 (let* ((begin2 (line-beginning-position)) > (end2 (line-end-position))) > (prog1 (buffer-substring begin2 end2) > (delete-region begin2 end2))))) > (insert line1) > (goto-char begin1) > (insert line2)) > (forward-line) > (setq nlines (1- nlines)))))) > > (The structure of let*/let/let* bindings may seem > excessively complex, but I’m taking care here to not expose > bindings beyond their validity. E.g. as soon as > (delete-region begin1 end1) is executed, end1 no longer > refers to anything meaningful, so I drop that binding asap.) Alright, that more like it. Scientific randomness at you service! Well, yes, `let' within a let body I think I've seen and even done a couple of times, let inside a let varlist I believe is a new experience but why not :) -- underground experts united https://dataswamp.org/~incal