bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

[Ihor Radchenko]

Eli Zaretskii <eliz@gnu.org> writes:

>> Then how will the callback be different from
>> (mapc #'my-function (directory-files-recursively ...))
>> ?
>
> It depends on the application.  Applications that want to get all the
> data and only after that process it will not use the callback.  But I
> can certainly imagine an application that inserts the file names, or
> some of their transforms, into a buffer, and from time to time
> triggers redisplay to show the partial results.  Or an application
> could write the file names to some disk file or external consumer, or
> send them to a network process.

But won't the Elisp callback always result in a queue that will
effectively be synchronous?

Also, another idea could be using iterators - the applications can just
request "next" file as needed, without waiting for the full file list.

-- 
Ihor Radchenko // yantar92,
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