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From: Mikael Magnusson <mikachu@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zach Riggle <zachriggle@gmail.com>,
	Roman Neuhauser <neuhauser@sigpipe.cz>,
	 Zsh Users <zsh-users@zsh.org>
Subject: Re: Silly question on :h and = expansion
Date: Wed, 18 Aug 2021 04:55:05 +0200	[thread overview]
Message-ID: <CAHYJk3Tm9JugtdpRApxsyLS5roRh3fSdSm4nAMfBSrzdvdsVvw@mail.gmail.com> (raw)
In-Reply-To: <CAH+w=7a0mQ9xDXvE2QAVdt8FV9FLtziU4csAwWXSgESDyQbFZw@mail.gmail.com>

On 8/18/21, Bart Schaefer <schaefer@brasslantern.com> wrote:
> On Tue, Aug 17, 2021 at 4:27 PM Zach Riggle <zachriggle@gmail.com> wrote:
>>
>> Awesome!!! These are all wonderful.  "=foo(:h)" is the most concise
>> way I see, and fits with my style.
>
> It might be worth noting:  That formulation only works in contexts
> where globbing is done, so not e.g. in conditionals.
>
> % [[ -f =zsh ]] && echo yes
> yes
> % [[ -d =zsh(:h) ]] && echo yes || echo no
> no
> % [[ -d ${${:-=zsh}:h} ]] && echo yes || echo no
> yes

You can use this form to enable globbing in conditionals,
% [[ -d =zsh(#q:h) ]] && echo yes || echo no
yes

but using = in conditionals is not very useful anyway since when it
fails it aborts, rather than returning an error (and (N) doesn't
suppress it since it's not a glob),
% [[ -f =bloo ]] || echo no
zsh: bloo not found!

-- 
Mikael Magnusson


  reply	other threads:[~2021-08-18  2:55 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17 17:39 Zach Riggle
2021-08-17 17:59 ` Bart Schaefer
2021-08-17 21:35   ` Roman Neuhauser
2021-08-17 21:49     ` Bart Schaefer
2021-08-17 23:27       ` Zach Riggle
2021-08-18  0:12         ` Bart Schaefer
2021-08-18  2:55           ` Mikael Magnusson [this message]
2021-08-18  3:25             ` Bart Schaefer
2021-08-17 21:31 ` Paul
2021-08-17 21:39   ` Roman Neuhauser

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