From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: more url-utils? Date: Thu, 19 May 2011 10:28:05 -0300 Message-ID: References: <87fwogaxzb.fsf@stupidchicken.com> <87mxilezg8.fsf@lifelogs.com> <87boz0eov8.fsf@lifelogs.com> <87mxikrulm.fsf@lifelogs.com> <871uzw5asv.fsf@lifelogs.com> <87boyzcv0o.fsf@lifelogs.com> <87k4dnassv.fsf@lifelogs.com> <878vu23lpe.fsf@lifelogs.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1305811702 8695 80.91.229.12 (19 May 2011 13:28:22 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 19 May 2011 13:28:22 +0000 (UTC) Cc: emacs-devel@gnu.org To: Ted Zlatanov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu May 19 15:28:14 2011 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1QN3Gv-000661-1V for ged-emacs-devel@m.gmane.org; Thu, 19 May 2011 15:28:13 +0200 Original-Received: from localhost ([::1]:55778 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QN3Gu-00072h-Bf for ged-emacs-devel@m.gmane.org; Thu, 19 May 2011 09:28:12 -0400 Original-Received: from eggs.gnu.org ([140.186.70.92]:47000) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QN3Gr-00072Q-DB for emacs-devel@gnu.org; Thu, 19 May 2011 09:28:10 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QN3Gq-0005xm-Ie for emacs-devel@gnu.org; Thu, 19 May 2011 09:28:09 -0400 Original-Received: from fencepost.gnu.org ([140.186.70.10]:46259) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QN3Gq-0005xi-Ft for emacs-devel@gnu.org; Thu, 19 May 2011 09:28:08 -0400 Original-Received: from 213-159-126-200.fibertel.com.ar ([200.126.159.213]:47941 helo=ceviche.home) by fencepost.gnu.org with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1QN3Gp-000640-UU; Thu, 19 May 2011 09:28:08 -0400 Original-Received: by ceviche.home (Postfix, from userid 20848) id 4CD8266230; Thu, 19 May 2011 10:28:05 -0300 (ART) In-Reply-To: <878vu23lpe.fsf@lifelogs.com> (Ted Zlatanov's message of "Thu, 19 May 2011 07:43:09 -0500") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 140.186.70.10 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:139513 Archived-At: >>> OK. But if the status is nil we couldn't get any data so there are no >>> URL properties. So we can have just one callback parameter "url-info" >>> which is nil if the request failed and an alist if it worked. SM> I think that a boolean status is not sufficient. E.g. in case of SM> failure, we want to have some information about why (e.g. an error SM> message). > ..but we don't want to throw an error. Hrm. How about "url-info" is > three possible types: > 1) nil = failed, no information available (should happen only if there's > no handler for the URL's protocol) > 2) atom (string or symbol) = failed, information is the string or the > symbol's properties How 'bout: the result of url-fetch (either returned in passed to the callback), is list of the form (STATUS . INFO): if STATUS is nil, it means the call was a success and INFO is an alist of auxiliary info such as headers and stuff, and if STATUS is non-nil, it should be an error symbol and INFO is some failure information such that one can do (signal (car result) (cdr result)). Stefan