Zsh Mailing List Archive Messages sorted by: Reverse Date, Date, Thread, Author

Re: unshift

X-seq: zsh-users 29753
From: Ray Andrews <rayandrews@xxxxxxxxxxx>
To: zsh-users@xxxxxxx
Subject: Re: unshift
Date: Mon, 1 Apr 2024 09:11:25 -0700
Archived-at: <https://zsh.org/users/29753>
In-reply-to: <CAN=4vMrdheVwmTYYUaoZF2mwRO_BLeV+yJU+iUzOUDnfc0cJiQ@mail.gmail.com>
List-id: <zsh-users.zsh.org>
References: <f1e0b92a-07b6-46c0-a2d6-6eeda828620b@eastlink.ca> <CAN=4vMrdheVwmTYYUaoZF2mwRO_BLeV+yJU+iUzOUDnfc0cJiQ@mail.gmail.com>



On 2024-04-01 07:38, Roman Perepelitsa wrote:

On Mon, Apr 1, 2024 at 3:52 PM Ray Andrews <rayandrews@xxxxxxxxxxx> wrote:

Can we unshift the positional params?

That's an interesting challenge. A start:

Very interesting! Could it be official? Maybe not worth it's weightbut ...

=================================


   alias shift='emulate zsh -o typeset_silent -c "local -a _shift_a _shift_n"
                _shift_a+=("$@")
                _shift_n+=(-$#)
                shift'

   alias unshift='set -- "${(@)_shift_a[_shift_n[-1],-1]}"
                  _shift_a[_shift_n[-1],-1]=()
                  _shift_n[-1]=()'

unshift undoes the last call to `shift [ -p ] [ n ]`. I think (not
entirely sure) that it works with all options. Unfortunately, it does
not work for `shift [ -p ] [ n ] name ...`.

Roman.

Follow-Ups:
- Re: unshift
  - From: Roman Perepelitsa

References:
- unshift
  - From: Ray Andrews
- Re: unshift
  - From: Roman Perepelitsa

Messages sorted by: Reverse Date, Date, Thread, Author