From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Kevin Rodgers Newsgroups: gmane.emacs.help Subject: Re: Filename of buffer into kill-ring functionality Date: Thu, 31 Aug 2006 14:40:21 -0600 Organization: IHS Message-ID: References: <9ofyfdql0b.fsf@gonzo.vircinity> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: sea.gmane.org 1157057067 23597 80.91.229.2 (31 Aug 2006 20:44:27 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Thu, 31 Aug 2006 20:44:27 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Aug 31 22:44:25 2006 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1GItNh-0006P3-Ob for geh-help-gnu-emacs@m.gmane.org; Thu, 31 Aug 2006 22:43:22 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GItNh-0002Vd-1K for geh-help-gnu-emacs@m.gmane.org; Thu, 31 Aug 2006 16:43:21 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1GItNN-0002VC-VQ for help-gnu-emacs@gnu.org; Thu, 31 Aug 2006 16:43:02 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1GItNK-0002Ug-IQ for help-gnu-emacs@gnu.org; Thu, 31 Aug 2006 16:43:00 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1GItNK-0002Ud-CU for help-gnu-emacs@gnu.org; Thu, 31 Aug 2006 16:42:58 -0400 Original-Received: from [80.91.229.2] (helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA:32) (Exim 4.52) id 1GItX1-0006Lr-44 for help-gnu-emacs@gnu.org; Thu, 31 Aug 2006 16:52:59 -0400 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1GItMe-00068h-Od for help-gnu-emacs@gnu.org; Thu, 31 Aug 2006 22:42:17 +0200 Original-Received: from 207.167.42.206 ([207.167.42.206]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 31 Aug 2006 22:42:16 +0200 Original-Received: from ihs_4664 by 207.167.42.206 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 31 Aug 2006 22:42:16 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-To: help-gnu-emacs@gnu.org Original-Lines: 38 Original-X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 207.167.42.206 User-Agent: Thunderbird 1.5.0.5 (Windows/20060719) In-Reply-To: X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:37088 Archived-At: Reiner Steib wrote: > On Thu, Aug 31 2006, Kevin Rodgers wrote: > >> (defun kill-new-string-variable (variable) >> "Make the string value of VARIABLE the latest kill in the kill ring." >> (interactive (let ((current-buffer (current-buffer))) >> (intern (completing-read "Variable: " obarray >> (lambda (symbol) >> (with-current-buffer current-buffer >> (and (boundp symbol) >> (stringp >> (symbol-value symbol))))) > > Is there a reason why you use (boundp symbol) inside > (with-current-buffer ...)? In other words: Is there any difference > between these variants? > > (with-current-buffer current-buffer > (and (boundp symbol) > (stringp (symbol-value symbol)))) > > (and (boundp symbol) > (with-current-buffer current-buffer > (stringp (symbol-value symbol)))) The reason with-current-buffer is necessary at all is that the predicate is run by completing-read with the minibuffer as the current buffer. I did it the first way when I first realized that, and it was simpler to just wrap the entire body of the predicate. Whether there's a difference between the two depends on whether a variable with a buffer local value can be unbound globally (or in other buffers, like the minibuffer). I think that depends on how buffer local bindings are implemented, and the first way is safer since it doesn't depend on how that. -- Kevin