From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Thorsten Jolitz Newsgroups: gmane.emacs.help Subject: How to make (format "%S" ...) print nothing? Date: Sat, 12 Jul 2014 12:43:41 +0200 Message-ID: <87sim6luw2.fsf@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1405161874 10000 80.91.229.3 (12 Jul 2014 10:44:34 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 12 Jul 2014 10:44:34 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Jul 12 12:44:28 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5un1-0005vv-Sw for geh-help-gnu-emacs@m.gmane.org; Sat, 12 Jul 2014 12:44:24 +0200 Original-Received: from localhost ([::1]:48482 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X5un1-0005cw-Fv for geh-help-gnu-emacs@m.gmane.org; Sat, 12 Jul 2014 06:44:23 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:56954) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X5umi-0005ay-CK for help-gnu-emacs@gnu.org; Sat, 12 Jul 2014 06:44:11 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X5uma-0007Tn-La for help-gnu-emacs@gnu.org; Sat, 12 Jul 2014 06:44:04 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:41702) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X5uma-0007TS-Fl for help-gnu-emacs@gnu.org; Sat, 12 Jul 2014 06:43:56 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1X5umY-0005Rb-8I for help-gnu-emacs@gnu.org; Sat, 12 Jul 2014 12:43:54 +0200 Original-Received: from g231226016.adsl.alicedsl.de ([92.231.226.16]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 12 Jul 2014 12:43:54 +0200 Original-Received: from tjolitz by g231226016.adsl.alicedsl.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 12 Jul 2014 12:43:54 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 45 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: g231226016.adsl.alicedsl.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) Cancel-Lock: sha1:OQb4mDwnTt9Y1DbDD8fnZb7OaOI= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:98656 Archived-At: Hi List, I have a case where (format "%S" ...) is generally much more convenient than (format "%s" ...), because it prints symbol args as strings and string args as strings surrounded by double quotes, except for this one situation: Prints nothing: #+begin_src emacs-lisp (format "%s" "") #+end_src #+results: but all of these print something #+begin_src emacs-lisp (format "%S" "") #+end_src #+results: : "" #+begin_src emacs-lisp (format "%S" nil) #+end_src #+results: : nil #+begin_src emacs-lisp (format "%S" ()) #+end_src #+results: : nil Is there any way to use (format "%S"...) and have it print nothing when given an empty string, an empty list or nil (or something else)? -- cheers, Thorsten