* prevent hook vanishing
@ 2018-05-18 8:23 akrl
2018-05-18 13:58 ` John Mastro
[not found] ` <mailman.32.1526651897.1292.help-gnu-emacs@gnu.org>
0 siblings, 2 replies; 5+ messages in thread
From: akrl @ 2018-05-18 8:23 UTC (permalink / raw)
To: help-gnu-emacs
Hi all,
How do I prevent emacs from removing a hook I've installed using
something like:
(add-hook 'after-change-functions 'render-buf nil t) in case of an error
occur executing it?
I would also be fine in being able to reinstall it somehow afterward.
Bests
akrl
--
akrl@sdf.org
SDF Public Access UNIX System - https://sdf.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: prevent hook vanishing
2018-05-18 8:23 prevent hook vanishing akrl
@ 2018-05-18 13:58 ` John Mastro
[not found] ` <mailman.32.1526651897.1292.help-gnu-emacs@gnu.org>
1 sibling, 0 replies; 5+ messages in thread
From: John Mastro @ 2018-05-18 13:58 UTC (permalink / raw)
To: Help Gnu Emacs mailing list; +Cc: akrl
akrl <akrl@sdf.org> wrote:
> How do I prevent emacs from removing a hook I've installed using
> something like: (add-hook 'after-change-functions 'render-buf nil t)
> in case of an error occur executing it?
> I would also be fine in being able to reinstall it somehow afterward.
Why not use `condition-case' in your hook function to catch the error
and respond appropriately? (There are also `with-demoted-errors' and
`ignore-errors', if there's nothing that needs to be except to suppress
the error)
John
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: prevent hook vanishing
[not found] ` <mailman.32.1526651897.1292.help-gnu-emacs@gnu.org>
@ 2018-05-18 14:42 ` akrl
2018-05-18 15:59 ` John Mastro
[not found] ` <mailman.42.1526659194.1292.help-gnu-emacs@gnu.org>
0 siblings, 2 replies; 5+ messages in thread
From: akrl @ 2018-05-18 14:42 UTC (permalink / raw)
To: help-gnu-emacs
John Mastro <john.b.mastro@gmail.com> writes:
> Why not use `condition-case' in your hook function to catch the error
> and respond appropriately? (There are also `with-demoted-errors' and
> `ignore-errors', if there's nothing that needs to be except to suppress
> the error)
>
> John
Doesn't quite work. I wrap the hooked code around using ignore-errors,
then for instance if I get the following error (from *Messages*):
"Symbol's value as variable is void"
the hook is wiped out.
Bests
akrl
--
akrl@sdf.org
SDF Public Access UNIX System - https://sdf.org
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: prevent hook vanishing
2018-05-18 14:42 ` akrl
@ 2018-05-18 15:59 ` John Mastro
[not found] ` <mailman.42.1526659194.1292.help-gnu-emacs@gnu.org>
1 sibling, 0 replies; 5+ messages in thread
From: John Mastro @ 2018-05-18 15:59 UTC (permalink / raw)
To: Help Gnu Emacs mailing list; +Cc: akrl
akrl <akrl@sdf.org> wrote:
> > Why not use `condition-case' in your hook function to catch the error
> > and respond appropriately? (There are also `with-demoted-errors' and
> > `ignore-errors', if there's nothing that needs to be except to suppress
> > the error)
> Doesn't quite work. I wrap the hooked code around using ignore-errors,
> then for instance if I get the following error (from *Messages*):
> "Symbol's value as variable is void"
> the hook is wiped out.
Hm, then you may have another problem. The following simple example
works for me:
(defun boom-after-change (&rest _)
(ignore-errors (error (message "Boom!"))))
(add-hook 'after-change-functions #'boom-after-change nil t)
Hope that helps
John
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: prevent hook vanishing
[not found] ` <mailman.42.1526659194.1292.help-gnu-emacs@gnu.org>
@ 2018-05-18 21:38 ` akrl
0 siblings, 0 replies; 5+ messages in thread
From: akrl @ 2018-05-18 21:38 UTC (permalink / raw)
To: help-gnu-emacs
John Mastro <john.b.mastro@gmail.com> writes:
> Hm, then you may have another problem. The following simple example
> works for me:
>
> (defun boom-after-change (&rest _)
> (ignore-errors (error (message "Boom!"))))
>
> (add-hook 'after-change-functions #'boom-after-change nil t)
>
> Hope that helps
>
> John
Thanks John,
that worked perfectly for me now, seems I was wrapping at the wrong level.
Bests!
akrl
--
akrl@sdf.org
SDF Public Access UNIX System - https://sdf.org
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-05-18 21:38 UTC | newest]
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2018-05-18 8:23 prevent hook vanishing akrl
2018-05-18 13:58 ` John Mastro
[not found] ` <mailman.32.1526651897.1292.help-gnu-emacs@gnu.org>
2018-05-18 14:42 ` akrl
2018-05-18 15:59 ` John Mastro
[not found] ` <mailman.42.1526659194.1292.help-gnu-emacs@gnu.org>
2018-05-18 21:38 ` akrl
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