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Date: Sun, 2 Nov 2014 14:57:22 -0800
Message-ID: <CAH+w=7b55P0QdPaeA_dpmPbGaYERcm5nFXthFxN_5YpvFRDGyw@mail.gmail.com>
Subject: Re: for loop question
From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh Users <zsh-users@zsh.org>
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On Nov 2, 2014 2:42 PM, "Ray Andrews" <rayandrews@eastlink.ca> wrote:
>
> But it does show that 'for ((' CAN stop and digest  ' [ -n "$TLC[i]" ] '
if it wants too,
> it just has to make it obscenely difficult. Why can't the truth test of a
command just be taken
> as 'arithmetic' plain and simple?

It's a matter of order-of-evaluation and contextual tokenization.  Once the
parser encounters "for ((" it stops looking for ordinary shell command
tokens and starts looking for math tokens; a word like "test" in that
context is a numeric variable name, not a command name, and "[" has another
meaning as well.  But "$" introduces an expansion in either context, so
$(...) switches back into the regular parsing mode.

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