From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: xenodasein--- via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Explanation Request for the Function set-transient-map in subr.el Date: Sun, 28 Nov 2021 21:48:47 +0100 (CET) Message-ID: References: Reply-To: xenodasein@tutanota.de Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24998"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Help Gnu Emacs To: Stefan Monnier , michael_heerdegen@web.de Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Nov 28 21:49:13 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 1mrR6n-0006Hp-Ar for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 28 Nov 2021 21:49:13 +0100 Original-Received: from localhost ([::1]:50058 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mrR6m-0002JT-7Q for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 28 Nov 2021 15:49:12 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:35580) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mrR6R-0002JJ-RO for help-gnu-emacs@gnu.org; Sun, 28 Nov 2021 15:48:51 -0500 Original-Received: from w1.tutanota.de ([81.3.6.162]:53406) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mrR6P-0004YO-Lo for help-gnu-emacs@gnu.org; Sun, 28 Nov 2021 15:48:50 -0500 Original-Received: from w3.tutanota.de (unknown [192.168.1.164]) by w1.tutanota.de (Postfix) with ESMTP id E62F5FBF55C; Sun, 28 Nov 2021 20:48:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1638132527; s=s1; d=tutanota.de; h=From:From:To:To:Subject:Subject:Content-Description:Content-ID:Content-Type:Content-Type:Content-Transfer-Encoding:Content-Transfer-Encoding:Cc:Cc:Date:Date:In-Reply-To:In-Reply-To:MIME-Version:MIME-Version:Message-ID:Message-ID:Reply-To:References:References:Sender; bh=bCrz5C3YjTs+GWDVnbdLypHGkFasyeFZbOB0BBGP4kc=; b=FWeVmlvLkZ3BZ2km8vpRAEQJ1R5iw9Gu/esfmbtEMBxKr/y95q3Aay5O/2VG1bdF ymXGhRupbpAgQapHIfU8a7E+DOHFPd0DUdP/oEwL3dn0FX/bpWC9/f7k7W//SxeFYj3 751ETaG5tz/Y2jC8RklD7HMcybGyH00xTyrA+lFHuGzmiQl9YvvbFU2IXp5Xh1MZLjs sDarETituIY/Ik5FZsUS2918LTihjFDGYrPzwTDqNbQ7UXQne17cdeItZyvd1wjoCor kcNa7rvzSnbaCij5oLT0zva2iK1TMujxEm/aebBYCIbuKdI53apKs63N61L3kw9t34p e7++NjjDHg== In-Reply-To: Received-SPF: pass client-ip=81.3.6.162; envelope-from=xenodasein@tutanota.de; helo=w1.tutanota.de 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, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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:134711 Archived-At: > This tests whether the user typed a key-sequence from `map` as opposed > to some other one. > > E.g. when you use `text-scale-adjust`, you want to "stay" in the > transient map as long as the user uses one of the keys in the `map` > (basically, +, -, or 0) and if the user types some other key, we > immediately/automatically exit from this transient map. > > Stefan > As Stefan and the comment tried to describe: this checks whether the > execution of current command happened using a key binding from the > transient MAP. > What are the possible values of mc here on the last line? > This test is done to fullfill this part of the docstring: >| [...] if the optional argument KEEP-PRED is t, MAP stays active if a >| key from MAP is used > If this is the case, it's as you described, and the test succeeds.=C2=A0 = But > when the current command has not been invoked using a binding in the > transient map, mc is `nil' and the `eq'ality test fails as we want to > disable the transient map. But then, isn't that second expression redundant? Lookup key is already loo= king in our transient map, if it succeeds mc will be non-nil and equal this-comm= and, if it does not, 'and' will return nil anyway?