From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: result of completing-read contradicting require-match Date: Sat, 9 Jul 2022 16:17:57 +0300 Message-ID: References: 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="15329"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/+ () (2022-06-11) Cc: carlmarcos@tutanota.com, Help Gnu Emacs To: Yuri Khan Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jul 10 08:51:15 2022 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 1oAQmh-0003kE-KP for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 10 Jul 2022 08:51:15 +0200 Original-Received: from localhost ([::1]:48600 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oAQmg-0007rM-6w for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 10 Jul 2022 02:51:14 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oAQmA-0007qx-4v for help-gnu-emacs@gnu.org; Sun, 10 Jul 2022 02:50:42 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:37079) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oAQm8-0006vY-1S for help-gnu-emacs@gnu.org; Sun, 10 Jul 2022 02:50:41 -0400 Original-Received: from localhost ([::ffff:102.84.15.163]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 00000000000A3AEF.0000000062CA769D.00006975; Sat, 09 Jul 2022 23:50:04 -0700 Mail-Followup-To: Yuri Khan , carlmarcos@tutanota.com, Help Gnu Emacs Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 5.0 requ) BAYES_00=-1.9, DATE_IN_PAST_12_24=1.049, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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:138411 Archived-At: * Yuri Khan [2022-07-02 22:56]: > On Sun, 3 Jul 2022 at 02:29, Jean Louis wrote: > > > REQUIRE-MATCH can take the following values: > > - a function, which will be called with the input as the parameter. > > If it returns a non-nil value, the minibuffer is exited with that value. > > > other way to persist asking until you get the true result is here: > > > > (defun rcd-repeat-until-not-empty-string (function &rest args) > > "Repeat FUNCTION with optional ARGS until result is not empty string." > > (let ((result)) > > (while (string-empty-p (setq result (apply function args)))) > > result)) > > Based on the quoted part of the docstring, you could probably pass a > function that returns t for an allowed value, and nil for disallowed > values, including an empty string or nil. I would like to do that Yuri. I was thinking about it, and it bothers me. I would like to merge these two functions and use each of them sometimes singly. The third merged one would check for both values. (defun rcd-repeat-until-not-nil (function &rest args) "Repeat FUNCTION with optional ARGS until result is not nil." (let ((result)) (while (not (setq result (apply function args)))) result)) (defun rcd-repeat-until-not-empty-string (function &rest args) "Repeat FUNCTION with optional ARGS until result is not empty string." (let ((result)) (while (string-empty-p (setq result (apply function args)))) result)) You say to pass the function to check for allowed values. Do you mean then to have something like (defun rcd-repeat- (function check-function &args) ? Example usage would be like: (rdc-repeat-until-something 'read-from-minibuffer) but also (rdc-repeat-until-something 'read-number) and here is what I come up with, (defun rcd-is-something-p (thing) "Return TRUE if THING is something." (cond ((and (stringp thing) (seq-empty-p thing)) nil) ((and (numberp thing) (not thing)) nil) (t t))) (defun rcd-repeat-until-something (function &rest args) "Repeat FUNCTION with optional ARGS until result is something. Result shall be non empty string or number." (let ((result)) (while (rcd-is-nothing-p (setq result (apply function args)))) result)) Then I can tell for example: rcd-repeat-until-something 'read-from-minibuffer "Say: ") ⇒ "Something" without being allowed to exit the loop until the result is there. But then I am also checking for number to be non-nil as well. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/