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Re: Is it possible to clear empty :-tied elements?

X-seq: zsh-users 27908
From: Phil Pennock <zsh-workers+phil.pennock@xxxxxxxxxxxx>
To: zsh-users@xxxxxxx
Subject: Re: Is it possible to clear empty :-tied elements?
Date: Wed, 20 Jul 2022 15:32:27 -0400
Archived-at: <https://zsh.org/users/27908>
In-reply-to: <CAKc7PVAbCrSRNZtQ_b3ZX3iBOe9tjNdFX8bV1BMKSb7Wxj=mZQ@mail.gmail.com>
List-id: <zsh-users.zsh.org>
Openpgp: url=https://www.security.spodhuis.org/PGP/keys/keys-2013rsa-2020cv25519.asc
References: <CAKc7PVAbCrSRNZtQ_b3ZX3iBOe9tjNdFX8bV1BMKSb7Wxj=mZQ@mail.gmail.com>

On 2022-07-19 at 21:54 +0200, Sebastian Gniazdowski wrote:
> export -UT CMAKE_PREFIX_PATH="$ZPFX:$CMAKE_PREFIX_PATH" cmake_prefix_path
> 
> The problem is that the variable/array will contain empty element if the
> variable is empty when export is run.
> 
> I wonder if is it possible to somehow clear such empty entry (i.e.: to
> remove :: from "a::b") without another line of code?

Assign it as an array and do _not_ quote the $ZPFX, so that empty values
are not preserved.

  export -UT CMAKE_PREFIX_PATH cmake_prefix_path=($ZPFX "${(s,:,)CMAKE_PREFIX_PATH}")

If you have to be resilient to SH_WORD_SPLIT being enabled, then replace
$ZPFX with ${==ZPFX} instead.

-Phil

References:
- Is it possible to clear empty :-tied elements?
  - From: Sebastian Gniazdowski

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