From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: pjb@informatimago.com (Pascal J. Bourguignon) Newsgroups: gmane.emacs.help Subject: Re: Element-Relative Sequence Insertion Date: Thu, 11 Jun 2009 14:38:22 +0200 Organization: Anevia SAS Message-ID: <7czlcf0wu9.fsf@pbourguignon.anevia.com> References: NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1244724216 9838 80.91.229.12 (11 Jun 2009 12:43:36 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 11 Jun 2009 12:43:36 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Jun 11 14:43:33 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1MEjcz-0005Hq-FM for geh-help-gnu-emacs@m.gmane.org; Thu, 11 Jun 2009 14:43:33 +0200 Original-Received: from localhost ([127.0.0.1]:45573 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MEjcy-0003IH-Ec for geh-help-gnu-emacs@m.gmane.org; Thu, 11 Jun 2009 08:43:32 -0400 Original-Path: news.stanford.edu!headwall.stanford.edu!news.glorb.com!news2.glorb.com!news.wiretrip.org!proxad.net!feeder1-2.proxad.net!cleanfeed1-a.proxad.net!nnrp2-2.free.fr!not-for-mail Original-Newsgroups: gnu.emacs.help Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en X-Disabled: X-No-Archive: no User-Agent: Gnus/5.101 (Gnus v5.10.10) Emacs/22.2 (gnu/linux) Cancel-Lock: sha1:ZmRmZGI5ZThkYWMzMDg5NjQzZjdkNmY0YmFiNDFmMDg2NDBjYjAxOA== Original-Lines: 40 Original-NNTP-Posting-Date: 11 Jun 2009 14:38:23 MEST Original-NNTP-Posting-Host: 88.170.236.224 Original-X-Trace: 1244723903 news-1.free.fr 9745 88.170.236.224:49366 Original-X-Complaints-To: abuse@proxad.net Original-Xref: news.stanford.edu gnu.emacs.help:169936 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:65166 Archived-At: Nordlöw writes: > How do I insert an element (object) relative to another in a sequence > (or list in my case)? Example: > > (insert-after 'X '(a b c) 'b) => '(a b X c) > (insert-before 'X '(a b c) b) => '(a X b c) This is not what you want. You don't what these function to return a 2-element lists, the first of which is the symbol quote. Unless you're doing meta-programming you never want to have such a result. You wan this: (insert-after 'X '(a b c) 'b) --> (a b X c) (insert-before 'X '(a b c) 'b) --> (a X b c) Also, you may want to mention whether your insert-after and insert-before function are destructive or non-destructive. Since you show as only specification examples using literal data, we will assume you want them to be non-destructive. So you do that, just by doing it. There's nothing simplier. (qrsha vafreg-nsgre (arj yvfg byq) (pbaq ((ahyy yvfg) '()) ((rdy byq (pne yvfg)) (pbaf (pne yvfg) (pbaf arj (pqe yvfg)))) (g (pbaf (pne yvfg) (vafreg-nsgre arj (pqe yvfg) byq))))) (qrsha vafreg-orsber (arj yvfg byq) (pbaq ((ahyy yvfg) '()) ((rdy byq (pne yvfg)) (pbaf arj yvfg)) (g (pbaf (pne yvfg) (vafreg-orsber arj (pqe yvfg) byq))))) -- __Pascal Bourguignon__