From: Bart Schaefer <schaefer@brasslantern.com>
To: Ray Andrews <rayandrews@eastlink.ca>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: limit scope of variable
Date: Tue, 3 Aug 2021 13:39:28 -0700 [thread overview]
Message-ID: <CAH+w=7a5k9-Eg44z8zyE7zcdYzMGKWHipg2s5ca7pcVAAh1-Eg@mail.gmail.com> (raw)
In-Reply-To: <bd1be7c6-1bcd-c762-9add-031abc1744c5@eastlink.ca>
On Tue, Aug 3, 2021 at 1:15 PM Ray Andrews <rayandrews@eastlink.ca> wrote:
>
> I have a function that requires this:
>
> local IFS=$'\n'
>
> ... but the function calls other functions in which I need to protect
> $IFS from that change. Can I limit the scope?
That's what the zsh/param/private module is for, but unfortunately,
because IFS is a special parameter, you can't declare it private.
You can, however, declare IFS local in both functions, to avoid having
to explicitly restore it in the "inner" function.
calling_function() {
local OLDIFS=$IFS
local IFS=$'\n'
called_function
}
called_function() {
local IFS=$OLDIFS
...
}
However, it seems odd to me that called_function cares about the
$OLDIFS value. I would think it either does not care, or needs to
declare its own value explicitly. That is, I would think you don't
need $OLDIFS, and instead can do something like
called_function() {
local IFS; unset IFS # use default
...
}
next prev parent reply other threads:[~2021-08-03 20:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-03 20:15 Ray Andrews
2021-08-03 20:39 ` Bart Schaefer [this message]
2021-08-04 0:09 ` Ray Andrews
2021-08-03 20:41 ` Vin Shelton
2021-08-03 20:44 ` Bart Schaefer
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