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From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
To: Daniel Shahaf <d.s@daniel.shahaf.name>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: Disabling null elision (was: Re: Most Recent File)
Date: Mon, 25 Oct 2021 23:20:39 +0200	[thread overview]
Message-ID: <CAN=4vMqeHzo=B+413xX_9P=NyjC=M113QFAzR-=wiTLdCaFOdQ@mail.gmail.com> (raw)
In-Reply-To: <048e0b3d-6da9-4905-b1ad-253647cea0d3@www.fastmail.com>

On Mon, Oct 25, 2021 at 10:42 PM Daniel Shahaf <d.s@daniel.shahaf.name> wrote:
>
> Roman Perepelitsa wrote on Mon, 25 Oct 2021 20:02 +00:00:
>
> > It's also nice that this option would affect parsing, only evaluation,
> > so it won't be necessary to care about it when defining functions.
>
> How so?

Some options can be set within a function for the function to work as
the author has intended. For example, extended_glob.

    function foo() {
      emulate -L zsh -o extended_glob
      # can extended-glob here to one's heart's content
      [[ $1 == a## ]]
    }

Other options must be set when the function is defined. For example,
brace_expand.

    # if brace_expand is unset here, bar is screwed
    unset brace_expand  # bwa-ha-ha

    function bar() {
      emulate -L zsh -o brace_expand  # this won't help
      typeset var{1,2,3}=42
    }

    setopt brace_expand  # this won't help either
    bar  # oh no!

Options of the second kind cause more grief.

As Bar says, autoload -Uz is key when it comes to loading plugins and
sourcing is a losing game (I learned this from Bart earlier).
Sometimes you still have to have a function in a plugin that must run
with user options but at least that's just for evaluation and not for
parsing.

Roman.


  parent reply	other threads:[~2021-10-25 21:22 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-23 16:15 Most Recent File Vin Shelton
2021-10-23 16:43 ` Dominik Vogt
2021-10-23 16:58   ` Peter Stephenson
2021-10-23 17:24     ` Dominik Vogt
2021-10-23 17:32       ` Peter Stephenson
2021-10-23 18:39         ` Bart Schaefer
2021-10-23 19:07         ` Vin Shelton
2021-10-23 19:26           ` Bart Schaefer
2021-10-23 20:43             ` Vin Shelton
2021-10-23 20:56               ` Pier Paolo Grassi
2021-10-23 22:42                 ` Bart Schaefer
2021-10-24  0:24                   ` Pier Paolo Grassi
2021-10-24  0:32                     ` Paul
2021-10-24  1:45                       ` Dominik Vogt
2021-10-24  7:22                         ` Roman Perepelitsa
2021-10-25 19:45                           ` Disabling null elision (was: Re: Most Recent File) Daniel Shahaf
2021-10-25 20:02                             ` Roman Perepelitsa
2021-10-25 20:41                               ` Daniel Shahaf
2021-10-25 21:00                                 ` Ray Andrews
2021-10-25 21:09                                   ` Bart Schaefer
2021-10-25 21:05                                 ` Bart Schaefer
2021-10-25 21:20                                 ` Roman Perepelitsa [this message]
2021-10-25 20:05                             ` Bart Schaefer
2021-10-24  1:37                     ` Most Recent File Dominik Vogt
2021-10-23 16:47 ` david rayner
2021-10-23 16:54   ` Vin Shelton
2021-10-23 16:51 ` david rayner

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