From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: How to tame compiler? Date: Fri, 30 Apr 2021 18:50:36 -0400 Message-ID: References: <874kfn292f.fsf@disroot.org> <87eeerh1g9.fsf@zoho.eu> <87sg37flpu.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="2440"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:qHNMZ96deF9YTnAkTsVAPhNnx0Q= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat May 01 00:51:14 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 1lcbyc-0000Z3-06 for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 01 May 2021 00:51:14 +0200 Original-Received: from localhost ([::1]:49586 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lcbyb-0004a1-4e for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 30 Apr 2021 18:51:13 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55064) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lcby8-0004Wg-Pc for help-gnu-emacs@gnu.org; Fri, 30 Apr 2021 18:50:44 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:36500) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lcby7-00046v-Br for help-gnu-emacs@gnu.org; Fri, 30 Apr 2021 18:50:44 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1lcby4-000AVi-Tz for help-gnu-emacs@gnu.org; Sat, 01 May 2021 00:50:40 +0200 X-Injected-Via-Gmane: http://gmane.org/ 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: 2.1.23 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:129236 Archived-At: >> Here, as in your other example, you have to use `eval`, >> because `command-history` was defined to contain a list of >> ELisp expressions and those can't be used other than via >> `eval`. >> >> So I'll grant you a pass for this time. >> >> If you were in a position to control the format of history >> variable, then you wouldn't have to use `eval` here, OTOH: >> you could define that variable to hold a list of *functions* >> and you'd just use `funcall` instead of `eval`. > > OK, clear... Of course, you can't "search" for functions the way you do with the `cl-find-if`, and functions can't be printed in a user-friendly way, so there's a good reason for `command-history` not to contain just functions. So if you wanted to replace it with a history that can be used without `eval`, you'd probably make the new variable contain a list where every element is of the form (FUNCTION . ARGS), so that you'd replace `eval` with `apply`, and you'd recommend that the FUNCTION be a symbol rather than an anonymous function, to be sure that it can be compared and printed in a useful way. Stefan