Fwd: idle exit hook

Fwd: idle exit hook

[Ergus]

Hi:

I recently saw a question in reddit but the answer there was not
clear (or maybe it requires a feature request)

Is there an idle-time-exit-hook? or, what's the canonical method to call
a function after breaking an idle? something like on-idle-exit?

So far I understand that having such a hook could produce some
performance penalty but not more than post-command-hook for example. Any
way, adding some restrictions (running it only once || reset the
hooks list on every idle start/end or just documenting it properly)
could solve the problem.. does it makes sense?

The idea came to me when trying to implement my own version of
idle-highlight-mode to propose to add it to vanilla. I would like to
provide a different behaviour.

Best,
Ergus

Re: Fwd: idle exit hook

[Eli Zaretskii]

> Date: Wed, 22 Jul 2020 13:32:42 +0200
> From: Ergus <spacibba@aol.com>
> 
> Is there an idle-time-exit-hook? or, what's the canonical method to call
> a function after breaking an idle? something like on-idle-exit?

How do you define "breaking the idle"?  IOW, what events or activities
will potentially be considered as "breaking the idle"?

> The idea came to me when trying to implement my own version of
> idle-highlight-mode to propose to add it to vanilla. I would like to
> provide a different behaviour.

Not sure why you need a new hook for implementing that behavior.
maybe tell more details about what you intend to implement.

Re: Fwd: idle exit hook

[Ergus]

On Wed, Jul 22, 2020 at 04:59:24PM +0300, Eli Zaretskii wrote:
>> Date: Wed, 22 Jul 2020 13:32:42 +0200
>> From: Ergus <spacibba@aol.com>
>>
>> Is there an idle-time-exit-hook? or, what's the canonical method to call
>> a function after breaking an idle? something like on-idle-exit?
>
>How do you define "breaking the idle"?  IOW, what events or activities
>will potentially be considered as "breaking the idle"?
>
Hi Eli:

When I say "breaking the idle" I mean any event that potentially could
be considered as not in idle anymore... or anything that resets the idle
counter.

>> The idea came to me when trying to implement my own version of
>> idle-highlight-mode to propose to add it to vanilla. I would like to
>> provide a different behaviour.
>
>Not sure why you need a new hook for implementing that behavior.
>maybe tell more details about what you intend to implement.
>
The idea is extremely simple (that's why I thing it could be in
vanilla). When in idle for some seconds a run-with-idle-timer calls a
function to set a highlight for thing-at-point. (useful when
programming for example)

https://github.com/nonsequitur/idle-highlight-mode/blob/master/idle-highlight-mode.el

The problem with the original implementation (apart from being abandon
and re-implemented by many packages and configuration) is that the
unhighlight function is called only when the idled function is executed
again.

A more common behavior (as in vs-code, atom and so on) is that when we
press any key o perform any action to exit the "highlighted thing"; the
highlight disappears immediately.

This could be performed using a different hook, (post-command-hook) but
it will require add and remove the hook constantly...

WDYT?
Best
Ergus

Re: Fwd: idle exit hook

[Stefan Monnier]

> A more common behavior (as in vs-code, atom and so on) is that when we
> press any key o perform any action to exit the "highlighted thing"; the
> highlight disappears immediately.

`pre-command-hook` seems like the obvious choice.

> This could be performed using a different hook, (post-command-hook) but
> it will require add and remove the hook constantly...

Adding/removing from such hooks is very cheap, so it's not a problem.
This said, you can also just leave it on `pre-command-hook` (and set
a variable to indicate when there's nothing to unhighlight).


        Stefan