Re: Does Gnus automatically run 'notmuch new' if configured?

[Eric Abrahamsen <eric@ericabrahamsen.net>]

Pankaj Jangid <pankaj@codeisgreat.org> writes:

> On Thu, Sep 24 2020, Adam Sjøgren wrote:
>
>>> does Gnus automatically run "notmuch new" if notmuch is the configured
>>> search engine.
>>
>> If you want it run every time you have fetched mail, I think you could
>> add calling it to a hook, maybe gnus-after-getting-new-news-hook?
>
> Are hooks asynchronous? Eric had also suggested a similar solution. He
> suggested to put this at the time of startup. But my question is - will
> it increase the waiting time? I am fetching emails from multiple sources
> and it already takes 4-5 seconds to fetch emails when I press 'g'.

It's not the hook that's synchronous or asynchronous, it's the call to
the external process. You can use `shell-command' for a synchronous call
(probably not what you want), or `async-shell-command' for... async.

The async call should return more or less instantly. I'm sure notmuch is
capable of continuing to handle search queries while it's in the middle
of an update, so there's not actually any harm in calling it more often,
apart from burning CPU cycles.

Otherwise, your wait while Gnus fetches new mail is totally unrelated to
notmuch updating its index, as that happens in a completely separate
process.

HTH,
Eric