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Date: Fri, 14 Oct 2016 20:12:00 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: Zsh Users <zsh-users@zsh.org>
Subject: Re: Default true boolean zstyle
Message-ID: <20161014201200.GB4531@fujitsu.shahaf.local2>
References: <CAKc7PVDZJH28+x-FPNB3tKxP7z1yY73KJAqjnX1tTQjgegdH4Q@mail.gmail.com>
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Bart Schaefer wrote on Fri, Oct 14, 2016 at 10:53:01 -0700:
> On Thu, Oct 13, 2016 at 11:27 PM, Sebastian Gniazdowski
> <sgniazdowski@gmail.com> wrote:
> >
> > Apparently, zstyle -b returns false when the boolean being read is
> > false.
> >
> > Is there a way to have default-true boolean with zstyle?
> 
> You have to use
>     zstyle -T :test-context test-style && test_var=yes || zstyle -b
> :test-context test-style test_var

It's still surprising (and undocumented) that -b returns false when the
value of the style is false.  I expected it to return 0 for the same
reason that _call_function returns 0 when the called function returns
non-zero: $? == 0 means retrieving the value succeeded; check $test_var
to see what the value is.

But it's been this way for 15+ years...