From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: design ponderings: plist to alist Date: Wed, 16 Apr 2014 13:29:56 -0400 Message-ID: References: <87a9bl7rkd.fsf@zigzag.favinet> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1397669459 23751 80.91.229.3 (16 Apr 2014 17:30:59 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 16 Apr 2014 17:30:59 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Apr 16 19:30:52 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 1WaTff-0005gv-S9 for geh-help-gnu-emacs@m.gmane.org; Wed, 16 Apr 2014 19:30:51 +0200 Original-Received: from localhost ([::1]:55954 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WaTff-00063R-Eh for geh-help-gnu-emacs@m.gmane.org; Wed, 16 Apr 2014 13:30:51 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:33388) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WaTf8-0005xs-LB for help-gnu-emacs@gnu.org; Wed, 16 Apr 2014 13:30:26 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WaTf0-00065b-3P for help-gnu-emacs@gnu.org; Wed, 16 Apr 2014 13:30:18 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:51385) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WaTez-00065T-TQ for help-gnu-emacs@gnu.org; Wed, 16 Apr 2014 13:30:10 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WaTey-000437-92 for help-gnu-emacs@gnu.org; Wed, 16 Apr 2014 19:30:08 +0200 Original-Received: from 192.171.35.19 ([192.171.35.19]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 16 Apr 2014 19:30:08 +0200 Original-Received: from monnier by 192.171.35.19 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 16 Apr 2014 19:30:08 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 45 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 192.171.35.19 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) Cancel-Lock: sha1:tiSSZFsTVr+sNcE7jj4JS00vexU= 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:97155 Archived-At: > includes a function to convert plist (succinct to humans) to alist > (succinct to computers). I spent 20 minutes poking around the Emacs > source searching for something builtin, to no avail. I saw a few cases > of the opposite direction (alist to plist) and many cases where plists > are walked at time of use (e.g., the C code for text-properties), so > maybe this is a hint that plist to alist (pre-use) is a net lose. :-/ > What do people think? I dislike plists, so the only thing that would make some sense would be some kind of macro. (defmacro plist (&rest args) (let ((l '())) (while args (push '(cons ,(pop l) ,(pop l)) args)) `(list ,@(nreverse l)))) Then you'd write (let ((root (gnugo--root-node))) (cl-flet ((r! (alist) (gnugo--decorate root alist))) (r! (plist :SZ board-size :DT (format-time-string "%Y-%m-%d") :RU (if (string-match "--chinese-rules" args) "Chinese" "Japanese") :AP (cons "gnugo.el" gnugo-version) :KM komi)) (let ((gb (gnugo--blackp (gnugo-other user-color)))) (r! (plist (if gb :PW :PB) (user-full-name) (if gb :PB :PW) (concat "GNU Go " (gnugo-query "version"))))) (unless (zerop handicap) (r! (plist :HA handicap :AB (mapcar (gnugo--as-cc-func) (gnugo-lsquery "fixed_handicap %d" handicap))))))) which would also be more efficient by avoiding the &rest processing. Stefan PS: Not sure why I chose "plist" for that macro's name: a bad choice.