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From: Zoltan Hidvegi <hzoli@cs.elte.hu>
Message-Id: <199607150102.DAA03226@turan.elte.hu>
Subject: Re: Another patch to compctl-examples CVS compctl, and a bug?
To: schaefer@nbn.com
Date: Mon, 15 Jul 1996 03:02:23 +0200 (MET DST)
Cc: zsh-workers@math.gatech.edu
In-Reply-To: <960713173425.ZM5697@candle.brasslantern.com> from Bart Schaefer at "Jul 13, 96 05:34:22 pm"
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> It's now possible to avoid several external processes in generating the
> list of CVS-controlled files in the `cvstargets' function.  The key is
> this wonderful "parameter" (boy, is that misnamed) subsitution:
> 
> 	"${${${(f@)$({<${pref}CVS/Entries} 2>/dev/null)}#/}%%/*}"

There are two problems with that.  First I've modified the lexer so that
!, [[, { and } are reserved words now.  This means that these must be
delimited.  So {echo} no longer works, { echo } should be used instead.
Similarily [[-z $foo]] does not work, [[ -z $foo ]] should be used.

The other problem is that this depends on READNULLCMD being cat.
$(<...) always works since it is always recognized as a special command
substitution.  That's why the 2> redirection does not work in that case
(but a space between `(' and `<' fixes that problem).

> If there's a better way than `for f in ... do echo ... done' to prefix
> every element of the resulting array with ${pref}, I'd love to see it.

It's simply

 	"${pref}${^${${(f@)$({<${pref}CVS/Entries} 2>/dev/null)}#/}%%/*}"

> works fine.  However, if no CVS directory exists at all, the above
> subsitution prints a newline to the terminal -- which messes up zle.

Are you sure that there is not empty element in the reply?  The above
`parameter expansion' always produces at least one element.

Zoltan