From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: (call-interactively FN) leaks prefix arg into FN when called from within an interactive command Date: Tue, 24 Apr 2018 09:21:59 -0400 Message-ID: References: NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1524576042 21974 195.159.176.226 (24 Apr 2018 13:20:42 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 24 Apr 2018 13:20:42 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Apr 24 15:20:38 2018 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 1fAxs5-0005cl-20 for geh-help-gnu-emacs@m.gmane.org; Tue, 24 Apr 2018 15:20:37 +0200 Original-Received: from localhost ([::1]:58505 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fAxuC-0005Pz-0w for geh-help-gnu-emacs@m.gmane.org; Tue, 24 Apr 2018 09:22:48 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:40205) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fAxte-0005Pj-5U for help-gnu-emacs@gnu.org; Tue, 24 Apr 2018 09:22:19 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fAxta-0003n7-3a for help-gnu-emacs@gnu.org; Tue, 24 Apr 2018 09:22:14 -0400 Original-Received: from [195.159.176.226] (port=37448 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fAxtZ-0003m8-SS for help-gnu-emacs@gnu.org; Tue, 24 Apr 2018 09:22:10 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fAxrQ-0004n9-5n for help-gnu-emacs@gnu.org; Tue, 24 Apr 2018 15:19:56 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 28 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:rH6FnpgzU/hT7KCyML8A6/9JbSE= 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:116593 Archived-At: > | (if (null arg) (call-interactively #'find-file) > | (let (current-prefix-arg) > | (call-interactively #'ffap)))) > `---- I'd use (let ((current-prefix-arg nil)) (call-interactively (if arg #'ffap #'find-file))) > So the prefix argument to gk-find-file leaks to ffap, The (interactive "P") does not *consume* the value of current-prefix-arg, indeed. It just uses it to set the value of `arg`. > Is this intentional, or a bug? Neither. It's a consecuence of the design. > But is it really the _current_ command when it's invoked by > call-interactively? The "current command" is defined in terms of read-eval-loop, not in terms of `call-interactively`. For the same reason `call-interactively` does not run pre-command-hook and post-command-hook. Stefan