Add default source that uses is_async

[blueyed]

It would be useful to have an example or default source that makes use of is_async.

As for the feature itself it seems like deoplete is polling the sources regardless (until is_async gets set to False), right?
Would it be possible for the source to call deoplete instead?

Related: I've seen deoplete being stuck in the completion_begin/completion_end loop / polling all the time while in insert mode. This might be related to deoplete-jedi having crashed while experimenting (and therefore never could set self.is_async = False), but am not sure.
This needs investigation.

Ref: wellle/tmux-complete.vim#80

[Shougo]

I don't want to add no needed is_async source.
The default sources are not sample codes!

I think is_async source is not so needed in current deoplete.

[Shougo]

As for the feature itself it seems like deoplete is polling the sources regardless (until is_async gets set to False), right?

Yes.

Would it be possible for the source to call deoplete instead?

No.

Related: I've seen deoplete being stuck in the completion_begin/completion_end loop / polling all the time while in insert mode. This might be related to deoplete-jedi having crashed while experimenting (and therefore never could set self.is_async = False), but am not sure.

#645

[blueyed]

Would it be possible for the source to call deoplete instead?

No.

Are you sure? Why not?
Shouldn't sending a specific RPC message do it?
It could either be just for notification (i.e. "poll me again"), or contain the results already.

[Shougo]

Really?
Why it is needed?
I don't know the feature in the other auto completion plugins.

[blueyed]

I think the pattern of notifying instead of being polled is better, since it causes less overhead.
But I do not know the internals good enough yet, and therefore asked for why you think it is not possible.

[Shougo]

If deoplete uses neovim event loop, the implementation may be possible.
But current implementation is not.

And it is not compabile with older source implementation.
etc...

I think async source support is not important.

[Shougo]

neovim/pynvim#294