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: How to read an integer from the minibuffer Date: Tue, 16 Nov 2021 07:39:52 +0100 Message-ID: <87lf1o38p3.fsf@zoho.eu> References: <87ee7nqomk.fsf@mbork.pl> <874k8jz372.fsf@yahoo.com> <87czn7qhx7.fsf@mbork.pl> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="21218"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:VLdrEB1KpiNBuKuESClkXURxces= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Nov 16 07:42:22 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 1mmsAg-0005L9-7W for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 16 Nov 2021 07:42:22 +0100 Original-Received: from localhost ([::1]:53026 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mmsAe-0006iJ-Nf for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 16 Nov 2021 01:42:20 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:45218) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mms8c-0006i6-Po for help-gnu-emacs@gnu.org; Tue, 16 Nov 2021 01:40:14 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:54614) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mms8Y-0000V8-1B for help-gnu-emacs@gnu.org; Tue, 16 Nov 2021 01:40:12 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mms8P-0002kw-I7 for help-gnu-emacs@gnu.org; Tue, 16 Nov 2021 07:40:01 +0100 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: 2.1.29 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:134623 Archived-At: Jean Louis wrote: >> A form control for integer numbers only permits typing >> digits (as you initially asked). Now the user cannot enter >> -42. > > Integers may be negative. It is better to make _one_ "string-to-number" that makes sense, then one can easily add extra checks with `integerp' and `(< 0 n)' and whatever to make it more specific from there... Here is a start ... (defun string-to-number-number (str) (if (string= str "0") 0 (let ((num (string-to-number str))) (unless (zerop num) num) ))) ;; (string-to-number-number "10") ;; (string-to-number-number "1.5") ;; (string-to-number-number "0") ;; (string-to-number-number "-1.5") ;; (string-to-number-number "-10") ;; (string-to-number-number "not a number") ; nil -- underground experts united https://dataswamp.org/~incal