How to set exit trap from inner function?

How to set exit trap from inner function?

[Sebastian Gniazdowski]

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I want to automatically clear all functions created from outer function.

auto-unset-funcs() {
    # Don't leak any functions
    typeset -ga ef
    ef=( ${(k)functions} )
    # No localtraps – sets in outside scope
    trap "unset -f -- \"\${(k)functions[@]:|ef}\" &>/dev/null; unset ef"
EXIT
    trap "return 1" INT
}

Above code correctly clears new functions when pasted into the outer
function. However, I would like to avoid pasting and simply do:

outer() {
    emulate -L zsh
    auto-unset-funcs
    # freely define new functions…
}

However, the EXIT trap is executed when auto-unset-funcs exits, not when
outer() does… I thought that lack of localoptions localtraps would declare
the EXIT trap in the first function that has it (outer does, via emulate
-L). Doing setopt localoptions nolocaltraps in auto-unset-funcs didn't
help. Any ideas on having such auto-unset-funcs function?
-- 
Best regards,
Sebastian Gniazdowski

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Re: How to set exit trap from inner function?

[Bart Schaefer]

On Thu, Feb 23, 2023 at 6:10 PM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
>
> I want to automatically clear all functions created from outer function.
>
> Any ideas on having such auto-unset-funcs function?

Unclear what side-effect messing about with localtraps may have on
this, but you can use one EXIT trap to set another EXIT trap:

inner () {
  trap "print FROM INNER: \$0; trap 'print FROM OUTER: \$0' EXIT" EXIT
}
outer () {
  inner
}

% outer
FROM INNER: outer
FROM OUTER: Src/zsh


Getting the quoting right for something more complicated, is left as
an exercise.

Re: How to set exit trap from inner function?

[Sebastian Gniazdowski]

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Thanks. I've found a less invasive solution – to name all inner functions
witu tmp/… prefix, and unset them with nset -f -m tmp/\*


On Fri, 24 Feb 2023 at 23:41, Bart Schaefer <schaefer@brasslantern.com>
wrote:

> On Thu, Feb 23, 2023 at 6:10 PM Sebastian Gniazdowski
> <sgniazdowski@gmail.com> wrote:
> >
> > I want to automatically clear all functions created from outer function.
> >
> > Any ideas on having such auto-unset-funcs function?
>
> Unclear what side-effect messing about with localtraps may have on
> this, but you can use one EXIT trap to set another EXIT trap:
>
> inner () {
>   trap "print FROM INNER: \$0; trap 'print FROM OUTER: \$0' EXIT" EXIT
> }
> outer () {
>   inner
> }
>
> % outer
> FROM INNER: outer
> FROM OUTER: Src/zsh
>
>
> Getting the quoting right for something more complicated, is left as
> an exercise.
>


-- 
Best regards,
Sebastian Gniazdowski

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