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: Fri, 12 Nov 2021 01:28:32 +0100 Message-ID: <87y25u9pzj.fsf@zoho.eu> References: <87ee7nqomk.fsf@mbork.pl> <87v90ybymh.fsf@zoho.eu> 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="39625"; 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:h5tAtKXtud9Po26lH77EuL/bixk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Nov 12 01:29:11 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 1mlKRK-000A8M-RZ for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 12 Nov 2021 01:29:10 +0100 Original-Received: from localhost ([::1]:59178 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mlKRJ-0003qY-O2 for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 11 Nov 2021 19:29:09 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:39478) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mlKQv-0003q4-4S for help-gnu-emacs@gnu.org; Thu, 11 Nov 2021 19:28:45 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:42126) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mlKQt-0001Tw-5L for help-gnu-emacs@gnu.org; Thu, 11 Nov 2021 19:28:44 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mlKQr-0009WY-MU for help-gnu-emacs@gnu.org; Fri, 12 Nov 2021 01:28:41 +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: -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: 2.1.29 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:134502 Archived-At: Gregory Heytings wrote: >> 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? Nope, I don't like the first solution since it disallows certain input chars, that feels like the shell would disallow -j after 'ls' just because there is no such option to ls(1) ... i.e., that doesn't feel good. This time try it for real: (read-number "try enter a string: ") That's better. Rather, I meant show how to use the second solution to solve the OPs example, i.e. to read an integer and only an integer. > (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]*$" "0123456789") I get if: Wrong number of arguments: string-match, 4 but that's a minor bug I suspect ... You can also write the integer regexp like below (string-match "^[0-9]\\{1,\\}$" "99") ; 0, The Great One (string-match "^[0-9]\\{1,\\}$" "88") ; 0, Big Eric or maybe "^[1-9][0-9]*$" ... > 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.) There is such a package, xr - the reverse of rx, LOL :) https://elpa.gnu.org/packages/xr.html -- underground experts united https://dataswamp.org/~incal