From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stephen Berman Newsgroups: gmane.emacs.help Subject: Re: Printing comment-start of various modes Date: Tue, 13 Aug 2024 23:13:57 +0200 Message-ID: <875xs486sq.fsf@gmx.net> References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="39129"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Heime via Users list for the GNU Emacs text editor To: Heime Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Aug 13 23:14:46 2024 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 1sdyqr-0009x8-Qz for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 13 Aug 2024 23:14:45 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sdyqE-0003Kt-Qa; 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envelope-from=stephen.berman@gmx.net; helo=mout.gmx.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:147662 Archived-At: On Tue, 13 Aug 2024 20:09:57 +0000 Heime wrote: > This function should print the value of comment-start for various modes, > but I am not getting any comment-start outputs from it. > > (defun costart () > "Loop through various major modes and print the value of `comment-start`." > > (interactive) > > (let ( (modes '(sh-mode perl-mode python-mode > emacs-lisp-mode lisp-interaction-mode > org-mode tex-mode latex-mode texi-mode > c-mode c++-mode f90-mode fortran-mode > html-mode css-mode js-mode > java-mode php-mode) ) > > (output-buffer (generate-new-buffer "Costart")) ) > > (with-current-buffer output-buffer > (insert "Mode \t\t Comment Start \n") > (insert "---- \t\t ------------- \n")) > > (dolist (mode modes) > (with-temp-buffer > (funcall mode) > (let ((comment-start (or comment-start "None"))) > (with-current-buffer output-buffer > (insert (format "%s \t\t %s \n" mode comment-start)))))) > > (switch-to-buffer output-buffer))) You successively bind mode-specific value of comment-start in a temporary buffer, and then switch to output-buffer to print the values, but this buffer is in fundamental-mode, where comment-start has the value nil by default. Using the temporary buffer seems superfluous, you could just use output-buffer: (defun costart () "Loop through various major modes and print the value of `comment-start`." (interactive) (let ((modes '(sh-mode perl-mode python-mode emacs-lisp-mode lisp-interaction-mode org-mode tex-mode latex-mode texi-mode c-mode c++-mode f90-mode fortran-mode html-mode css-mode js-mode java-mode php-mode) ) (output-buffer (generate-new-buffer "Costart"))) (with-current-buffer output-buffer (insert "Mode \t\t Comment Start \n") (insert "---- \t\t ------------- \n")) (dolist (mode modes) (with-current-buffer output-buffer (funcall mode) (let ((comment-start (or comment-start "None"))) (insert (format "%s \t\t %s \n" mode comment-start))))) (switch-to-buffer output-buffer) (fundamental-mode))) Steve Berman