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From: Bart Schaefer <schaefer@brasslantern.com>
Date: Tue, 2 Jan 2018 11:35:33 -0800
Message-ID: <CAH+w=7bAies3vR4=zQrLMOoVHnp=Q5YbcyELhayyXYH5iVkMLg@mail.gmail.com>
Subject: Re: Handling of *ARGZERO options, for Zsh <= 5.3
To: dana <dana@dana.is>
Cc: Sebastian Gniazdowski <psprint@zdharma.org>, "zsh-workers@zsh.org" <zsh-workers@zsh.org>
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On Tue, Jan 2, 2018 at 8:57 AM, dana <dana@dana.is> wrote:
>
> If the problem is ZSH_ARGZERO, shouldn't this work in like 5.0+?
>
>   () {
>     setopt local_options posix_argzero
>     MY_ARGZERO=$0
>   }

For considerably older (but still not the oldest) zsh you can use
$funcfiletrace:

zmodload zsh/parameter
print -r -- ${ZSH_ARGZERO:=${${funcfiletrace[-1]}[(ws/:/)1]}}