From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: Is there symbol-plist functionality in Emacs Lisp? Date: Sat, 8 May 2021 19:36:43 +0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17238"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.6 (2021-03-06) Cc: help-gnu-emacs@gnu.org To: Stefan Monnier Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat May 08 18:38:56 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 1lfPyh-0004LT-Rc for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 08 May 2021 18:38:55 +0200 Original-Received: from localhost ([::1]:50928 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lfPyg-0002UA-Po for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 08 May 2021 12:38:54 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36422) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfPyO-0002U1-5H for help-gnu-emacs@gnu.org; Sat, 08 May 2021 12:38:36 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:60835) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lfPyM-0006Mm-Df for help-gnu-emacs@gnu.org; Sat, 08 May 2021 12:38:35 -0400 Original-Received: from localhost ([::ffff:102.84.101.70]) (AUTH: PLAIN securesender, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 00000000000ABF29.000000006096BE86.00004563; Sat, 08 May 2021 09:38:29 -0700 Mail-Followup-To: Stefan Monnier , help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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: 2.1.23 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:129573 Archived-At: * Stefan Monnier [2021-05-08 18:48]: > >> > While `symbol-plist' in Common Lisp returns the definition as below. > >> Is that really true of Common Lisp, or just of some implementations? > >> I can't seem to find that documented in the CLHS. > > True, it works just in CLISP. Is there equivalent in Emacs that I can > > get a function definition this way? > > Depends what you mean by "function definition", IOW depends what you > want to do with it. There `symbol-function` of course, and there are > also things like `find-function-noselect`. Thank you. When I was working in Common Lisp REPL, I have used CLISP, and it was handy to save a function that is deleted from file. (defun save-function () "Saves function at point" (interactive) (let ((function (function-called-at-point))) (when (and (symbolp function) (y-or-n-p (format "Save `%s'" (symbol-name function)))) (let* ((fun (symbol-function function)) (type (car fun)) (file (concat "/tmp/function-" (symbol-name function) ".el"))) (cond ((eq type 'lambda) (setq fun (append (list 'defun function) (cdr fun)))) ((eq type 'closure) (setq fun (append (list 'defun function) (nthcdr 2 fun))))) (message (string-to-file-force (prin1-to-string fun) file)))))) (defun save-function-delete () (save-function) (beginning-of-line) (mark-sexp) (delete-active-region)) Now if I wish to delete a function, but save it before hand, I would go to "save-function-delete" and invoke the key to run `safe-function-delete' It would save itself from memory, not from file as for future possible introspection and delete it from the file in the same time. -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns Sign an open letter in support of Richard M. Stallman https://stallmansupport.org/ https://rms-support-letter.github.io/