From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: [External] : Re: How do I pass a variable defined in a wrapping let, to a lambda? Date: Sat, 12 Mar 2022 18:14:40 -0500 Message-ID: References: <871qz85bwh.fsf@ericabrahamsen.net> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="16949"; 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:W4eLoD/iJYQKwNjjGYiKWf1SKQw= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Mar 13 01:08:53 2022 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 1nTBn1-0004I6-Pp for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 13 Mar 2022 01:08:51 +0100 Original-Received: from localhost ([::1]:42334 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nTBn0-0000tu-P9 for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 12 Mar 2022 19:08:50 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:58582) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nTAwj-00061G-MX for help-gnu-emacs@gnu.org; Sat, 12 Mar 2022 18:14:49 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:56440) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nTAwh-0000Z0-Ur for help-gnu-emacs@gnu.org; Sat, 12 Mar 2022 18:14:49 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nTAwf-0001xG-Ac for help-gnu-emacs@gnu.org; Sun, 13 Mar 2022 00:14:45 +0100 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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sat, 12 Mar 2022 19:08:26 -0500 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:136507 Archived-At: > Here is something that I don't know how to port to lexical binding. > My functions that call `ee-template00' are all defined in files with > "-*- lexical-binding: nil; -*-" - they don't work if I put them in > files with "-*- lexical-binding: t; -*-". You can make it work by sprinkling enough `defvar`, of course: often add `-*- lexical-binding: t; -*-` is all it takes, but sometimes you have to work harder. I remember battling with this code to beat it into submission by restructuring it a bit so that it doesn't rely so heavily on `eval` and dynamic scoping. I must have sent you the resulting patch back then (that was around the time we added it to GNU ELPA). > ;; (let ((hi "Here: ") (a 22) (b 33)) (ee-template00 "{hi}{a}+{b}={(+ a b)}")) Try (dlet ((hi "Here: ") (a 22) (b 33)) (ee-template00 "{hi}{a}+{b}={(+ a b)}")) or (defvar hi) (defvar a) (defvar b) (let ((hi "Here: ") (a 22) (b 33)) (ee-template00 "{hi}{a}+{b}={(+ a b)}")) IIRC my patch changed `ee-template00` into a macro, instead, so the references inside your string template had lexical access to the variables. Stefan