From: Juri Linkov <juri@linkov.net>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: 72229@debbugs.gnu.org
Subject: bug#72229: (setq overriding-terminal-local-map nil) in isearch-done
Date: Tue, 23 Jul 2024 20:46:33 +0300 [thread overview]
Message-ID: <86jzhcyqb2.fsf@mail.linkov.net> (raw)
In-Reply-To: <87h6cg856c.fsf@web.de> (Michael Heerdegen's message of "Tue, 23 Jul 2024 18:05:31 +0200")
>> This mechanism looks like a variable watcher enabled by
>> `add-variable-watcher'.
>> So you could add a watcher that conditionally controls variable
>> modifications.
>
> I don't think variable watchers are very helpful here. They don't solve
> the underlying problem: potentially infinite variables of the same name
> can exist, shadowing each other, with values partly sharing structures.
>
> Using variable watchers I can see whether a variable value gets shadowed
> or unassigned using a set operation - but I can't know whether the
> previous value still exists, as binding of some other variable, and if
> it will be stored back into the variable. Nor do I have access to old
> bindings and their values until the program assigns it back to the
> variable.
>
> I saw that in Bug#70938. Manipulations of a variable can interfere in
> annoying ways.
>
> Functions are different. You have only one dynamic binding (unless in
> the rare case of using `cl-letf', which is extremely rare). And you
> always have access to it to undo any prior modification.
I remember Stefan M suggested to use function variables as much as possible
such as (defvar isearch-filter-predicate #'isearch-filter-visible), then
it's easy to add more filters with add-function.
But I'm not sure is it possible to do the same with a variable
getter function? I mean that instead of (funcall isearch-filter-predicate)
such a getter function could be called (get-value isearch-filter-predicate)
to access the variable value.
next prev parent reply other threads:[~2024-07-23 17:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-21 14:49 bug#72229: (setq overriding-terminal-local-map nil) in isearch-done Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-22 12:49 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-23 6:32 ` Juri Linkov
2024-07-23 11:29 ` Eli Zaretskii
2024-07-23 17:54 ` Juri Linkov
2024-07-23 16:05 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-23 17:46 ` Juri Linkov [this message]
2024-07-24 16:42 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-24 17:27 ` Drew Adams via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-07-24 20:12 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
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