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From: Bart Schaefer <schaefer@brasslantern.com>
To: Pier Paolo Grassi <pierpaolog@gmail.com>
Cc: Zsh-Users List <zsh-users@zsh.org>
Subject: Re: while alias
Date: Mon, 7 Nov 2022 22:13:53 -0800	[thread overview]
Message-ID: <CAH+w=7an3D6d-6XX+PG=yNE4nJZdRR3NmnMWL7ENjxTbV2ra+g@mail.gmail.com> (raw)
In-Reply-To: <CAP+y1xA2rYkSgO2Xpo7NfDKeJwE5+Gc8BdFCsw8b8Mw0RGBvsg@mail.gmail.com>

On Mon, Nov 7, 2022 at 5:57 PM Pier Paolo Grassi <pierpaolog@gmail.com> wrote:
>
> Hello, I have the following alias defined:
>
> WI='while {read -r it; ! [[ $? -ne 0 && -z $it ]]}'
>
> that works fine except in command substitution:

Put spaces around your braces.

alias WI='while { read -r it; ! [[ $? -ne 0 && -z $it ]] }'

Aliases in command substitutions are parsed by a complicated dance
requiring that they be expanded and then backtracked over and then
re-parsed.  The character count for the "{" and/or "}" tokens is off
by one for the backtracking step when they don't have surrounding
whitespace.  (Leaving it to PWS, who choreographed this dance number,
to fix the footwork if possible.)


  reply	other threads:[~2022-11-08  6:14 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-08  1:56 Pier Paolo Grassi
2022-11-08  6:13 ` Bart Schaefer [this message]
2022-11-08 12:39   ` Peter Stephenson
2022-11-09 11:11     ` Pier Paolo Grassi

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