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Date: Sun, 2 Nov 2014 21:37:13 +0000
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Ray Andrews <rayandrews@eastlink.ca>, Zsh Users <zsh-users@zsh.org>
Subject: Re: for loop question
Message-ID: <20141102213713.GA4412@chaz.gmail.com>
Mail-Followup-To: Bart Schaefer <schaefer@brasslantern.com>,
	Ray Andrews <rayandrews@eastlink.ca>, Zsh Users <zsh-users@zsh.org>
References: <5456984A.3020001@eastlink.ca>
 <CAH+w=7aWS0xyS4CXRJBphDjesfUFQOsyJRMaG3RZRxmuj7xkOg__20885.3257158355$1414962125$gmane$org@mail.gmail.com>
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2014-11-02 13:00:14 -0800, Bart Schaefer:
> > I've fiddled around with various modifications but it seems to dislike "
> [ -n "$TLC[i]" ] "
> > even though the 'while' loop is happy with it.  That expression evaluates
> to true or
> > false, does it not? So why won't 'for' swallow it?
> 
> The double parents (( )) are special arithmetic syntax.  You can't use an
> ordinary shell command like "test" ( for which "[" is an alias) inside that
> construct.

You could with:

for ((i=1; (z[$([ -n "$TLC[i]" ])0]),$? == 0; i++))
  print -ru2 -- $TLC[i]

(not that you would want to).

Here, you more likely want:

for i ("$TLC[@]") print -ru2 -- $i

or

print -rlu2 -- "$TLC[@]"

or:

for ((i = 1; i <= $#TLC; i++)) print -ru2 -- $TLC[i]


Or (to print only till the first empty element):

for ((i = 1; $#TLC[i]; i++)) print -ru2 -- "$TLC[i]"

Or:

print -rlu2 -- "${(@)TLC[1,TLC[(i)]-1]}"

-- 
Stephane