From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings Newsgroups: gmane.emacs.help Subject: Re: How to read an integer from the minibuffer Date: Thu, 11 Nov 2021 14:30:11 +0000 Message-ID: References: <87ee7nqomk.fsf@mbork.pl> <87v90ybymh.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="9733"; mail-complaints-to="usenet@ciao.gmane.io" Cc: help-gnu-emacs@gnu.org To: Emanuel Berg Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Nov 11 15:33:35 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 1mlB8w-0002Fx-W6 for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 11 Nov 2021 15:33:35 +0100 Original-Received: from localhost ([::1]:60146 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mlB8v-0007Ax-MK for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 11 Nov 2021 09:33:33 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:44068) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mlB5j-0002RR-KX for help-gnu-emacs@gnu.org; Thu, 11 Nov 2021 09:30:15 -0500 Original-Received: from heytings.org ([95.142.160.155]:34398) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mlB5h-0000Kq-QE for help-gnu-emacs@gnu.org; Thu, 11 Nov 2021 09:30:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20210101; t=1636641011; bh=ZbffdWTvhgg2Z4WJscNLB2E5aPx07OfAPcDhsKf/rsE=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=rs8Zg2twAC2ktsfnhR1T5b7Q0jOh6ksoB3f45vuM1Mnkl8OijTo4q2wiSHNBWfom7 uEvrQqe1KtNB083xl3Xr53HkSRDYzUmZpCWU+dhlst2lmlM2VtyWSrroTElApaLYMs xGIeI/WZVVbLPvZbTcugUuVhVBtrjpxWFUGUk5h7QhdUgPfT0Q5tyaCE/G/yeUKIjH gVd6jmddZcFHAtkMLJPtdq44S+UJDy/bL+vtizRLywLQaK09YQUsfFoNNvyIIWjBVe /A/chN0OdxIDVslkaeU+HirccjaJBid9lHn7JQuf1VK7JlIdF/rSyGH5JGIcsYq2TK 4NqiwJ6GFCS5g== In-Reply-To: <87v90ybymh.fsf@zoho.eu> Received-SPF: pass client-ip=95.142.160.155; envelope-from=gregory@heytings.org; helo=heytings.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: 2.1.29 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:134485 Archived-At: > > Cool (honestly). But do show how to use that to read an integer and only > an integer ... > You mean, how these two answers can be combined? (defun restricted-read-from-minibuffer (prompt regexp &optional allowed-chars) "Read a string from the minibuffer, with additional constraints. If the input does not match REGEXP, read a string again. If ALLOWED-CHARS is a string, the only allowed characters are those in that string." (let ((map nil) (string nil)) (when (stringp allowed-chars) (let ((m (make-keymap))) (define-key m [t] (lambda () (interactive) (message "Character not allowed"))) (define-key m (kbd "RET") #'exit-minibuffer) (define-key m (kbd "") #'exit-minibuffer) (define-key m (kbd "C-j") #'exit-minibuffer) (define-key m (kbd "C-g") #'abort-minibuffers) (dolist (c (split-string allowed-chars "" t)) (define-key m c #'self-insert-command)) (setq map m))) (while (progn (setq string (read-from-minibuffer prompt nil map)) (when regexp (unless (string-match regexp string nil t) (message "Unexpected input.") (sit-for 1) t)))) string)) With this, (restricted-read-from-minibuffer "Integer? " "^[0-9][0-9]*$" "0123456789") will read "an integer and only an integer". And you can wrap it into a string-to-number to get the integer itself. (BTW, it seems that there's no way in Elisp to "expand" a regexp charset, e.g. "[0-9]" into "0123456789". That would make the ALLOWED-CHARS argument easier to type in.)