From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: default value with interactive Date: Sun, 19 Nov 2017 20:08:05 +0100 Message-ID: <86a7zi13ze.fsf@zoho.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1511118534 23256 195.159.176.226 (19 Nov 2017 19:08:54 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 19 Nov 2017 19:08:54 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Nov 19 20:08:50 2017 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eGUxV-0005p9-Pg for geh-help-gnu-emacs@m.gmane.org; Sun, 19 Nov 2017 20:08:49 +0100 Original-Received: from localhost ([::1]:54092 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eGUxd-0004JL-8k for geh-help-gnu-emacs@m.gmane.org; Sun, 19 Nov 2017 14:08:57 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:53813) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eGUx7-0004Ix-MJ for help-gnu-emacs@gnu.org; Sun, 19 Nov 2017 14:08:29 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eGUx4-0003GK-Gl for help-gnu-emacs@gnu.org; Sun, 19 Nov 2017 14:08:25 -0500 Original-Received: from [195.159.176.226] (port=40677 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eGUx4-0003FV-9x for help-gnu-emacs@gnu.org; Sun, 19 Nov 2017 14:08:22 -0500 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1eGUwp-0003Pf-Pb for help-gnu-emacs@gnu.org; Sun, 19 Nov 2017 20:08:07 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Original-Lines: 41 Original-X-Complaints-To: usenet@blaine.gmane.org Mail-Copies-To: never Cancel-Lock: sha1:EHsP7v9KwLPDLANuFu87zhOe+3U= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:114981 Archived-At: I'm preparing one of my packs for MELPA so I go thru the list of formal style suggestions [1] ... One I don't know how to do is when there is a default value. The info node that is referenced in the suggestion list, namely (info "(elisp) Programming Tips") says the prompt string should look like this Enter the answer (default 42): However then it says it should be implemented like this (defun foo (pos) (interactive (list (if SPECIFIED SPECIFIED-POS))) (unless pos (setq pos DEFAULT-POS)) ...) Note that DEFAULT-POS in this example does not appear in the `interactive' form! So how does it appear in the prompt string at all? And even if it did, how do you then get around it without having to compute/fetch DEFAULT-POS two times? One time for the prompt string, and then again to set pos (in the abstract example above)? Is there a real-code example somewhere when this is done the right way? [1] https://github.com/melpa/melpa/blob/master/CONTRIBUTING.md -- underground experts united http://user.it.uu.se/~embe8573