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Subject: Re: exported unset variables [was: 'export -p' lacks POSIX output]
To: Bart Schaefer <schaefer@brasslantern.com>,
        Zsh hackers list <zsh-workers@zsh.org>
References: <ca368ae0-3c79-0245-6905-09a5fc563c28@inlv.org>
 <9a5b08ae-f45b-d1df-9b3b-dd47a0f62412@inlv.org>
 <161028143156.ZM19947@torch.brasslantern.com>
 <bec1e0c3-ad4a-6513-726e-049723d18c24@inlv.org>
 <161028171859.ZM2366@torch.brasslantern.com>
From: Martijn Dekker <martijn@inlv.org>
Message-ID: <6db9e2a5-8f0b-71a2-95e6-8a8bbf4a281e@inlv.org>
Date: Sat, 29 Oct 2016 09:11:32 +0100
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Op 29-10-16 om 01:18 schreef Bart Schaefer:
[...]
> All my patch did was cause "export -p" to output the state of the
> environment variable instead of the state of the shell variable.

Understood.

> See if the patch below will help.

Seems like it's about halfway there:

$ PS1='%% ' Src/zsh -f -o posixbuiltins
% export var; echo ${var+set} ${var-unset}; typeset -p var
unset
export var
% var=; echo ${var+set} ${var-unset}; typeset -p var
set
typeset var=''

The variable name loses its export attribute upon assignment; it should
retain it.

> } (Also, is it correct/expected behaviour that zsh doesn't parse comments
> } on the interactive command line? Blindly copying/pasting the above won't
> } work for that reason.)
> 
> Yes, the option INTERACTIVE_COMMENTS has to be set to recognize comments
> at the command line.  Should this be on in POSIX mode?

I think so. All the other shells recognise comments in interactive mode
by default. The spec for comments at
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03
(#9) does not distinguish between interactive and non-interactive shells.

Thanks,

- M.