From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-27972-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 6231 invoked by alias); 25 May 2010 13:32:00 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
X-Seq: 27972
Received: (qmail 2330 invoked from network); 25 May 2010 13:31:58 -0000
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,UNPARSEABLE_RELAY
	autolearn=ham version=3.3.1
Received-SPF: none (ns1.primenet.com.au: domain at yahoo.fr does not designate permitted sender hosts)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=yahoo.fr;
  h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Date:From:To:Cc:Subject:Message-ID:Mail-Followup-To:References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To:User-Agent;
  b=dYtVl6x24sdg7xQXA5XH62SbO6rg9o2KZbACcVpTKr0eJgiK7khvurxTAslxBmNoXS45Ny00//+b200Xq5xvjAnPq6G6wJekGsgzgnTqILLgO0OYj4MvG/Ec94M+EwGQZEvyFaSJCyqOIN3jdxAIAtde7Z6zo6NEFfExAQX0Rxk=  ;
X-Yahoo-SMTP: V1UR0WuswBDVD1eFhM33188Ir8ciBckz4W8ZMsAh
X-YMail-OSG: Wq3_qkUVM1kXOY7kcNYn_2RtgoOEdGxsKRv8iOdso.nBAVbZYyPUE9mvuWryiWb3qSZ0OApWHexqKEaUzF.AYPpk.9iTVYUmzoaoVm7NG9l6ZbjQwTzEr4.KmiPuLxRZ6mH5gmLXIR1ZnYYxVixSIJbmvISXHMxJcPti8CU.Pb5A7BxmQEDmVPnNhWKbPkKW4fxmUUyQb8ByIBxIdMokn9boAtEF6n4ipd49liFI5fM_
X-Yahoo-Newman-Property: ymail-3
Date: Tue, 25 May 2010 14:25:13 +0100
From: Stephane Chazelas <stephane_chazelas@yahoo.fr>
To: Peter Stephenson <p.w.stephenson@ntlworld.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: ${(q)...} for newline
Message-ID: <chaz20100525132513.GB4384@yahoo.fr>
Mail-Followup-To: Peter Stephenson <p.w.stephenson@ntlworld.com>,
	Zsh hackers list <zsh-workers@zsh.org>
References: <p.w.stephenson@ntlworld.com> <10739.1274644720@pws-pc> <201005232045.o4NKjdLO027329@pws-pc.ntlworld.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <201005232045.o4NKjdLO027329@pws-pc.ntlworld.com>
User-Agent: Mutt/1.5.16 (2007-09-19)

2010-05-23 21:45:39 +0100, Peter Stephenson:
> Peter Stephenson wrote:
> > Param-style simple (i.e. backslash) quoting of a newline appends a real
> > newline in double quotes.  It seems to me it would occasion far fewer
> > surprises if this never output a literal newline, so this uses $'\n'.
> 
> Also, would I be right in thinking this is an accident waiting to
> happen?
> 
> % foo=(one '' three)
> % print ${(q)foo}
> one three
> 
> Certainly
> 
> % printf "%q\n" ''
> 
> 
> which uses the same quoting internally is incompatible with what bash
> does (it outputs '').  It looks like in both cases (and all explicit
> uses of backslash-quoting --- completion is different) empty strings
> might be better turned into an explicit ''.
[...]

Not in the first case though, as array expansion removes the
empty elements. But in "${(@q)foo}" yes maybe, at least to be
consistent with bash and ksh93 printf %q.

$ zsh -c 'a=(a "" b); printf "<%s>\n" ${(q)a}'
<a>
<b>
$ zsh -c 'a=(a "" b); printf "<%s>\n" "${(q@)a}"'
<a>
<>
<b>

-- 
Stephane