Add prefix filter search in select control

[gbataille]

As featured here (when selecting the AWS region) https://asciinema.org/a/AyujEPdjcDmSPoOK26pTozCiO

@tmbo thanks for pointing me here from PyInquirer. Looks like the more modern/maintained alternatives (latest lib, tests, ...)

I'll try to use questionary soon and if it's all good, I'll contribute the filter that I have built that I find very practical on long lists like the one I'm dealing with.

[tmbo]

The filter looks really cool, would love to integrate that :rocket:

[gbataille]

Hey @tmbo so I migrated my code to questionary. https://github.com/gbataille/password-organizer/pull/1

What I like

• you created a Choice class (like I had done) 👍
• I could remove all my custom code (at least the part that was emulating PyInquirer)

What I'm missing

• I think Choice should be a Generic type, parameterised by the type T of it's return value. Actually I would personally tend to remove the python-style "I accept multiple type in input" and just deal with List of Choice and not accept str and dict
• You swallow KeyboardInterrupt errors to return None. I had made the choice to not do that. Not sure I like it, but at least we should document it.
• The current implementation does not allow custom key bindings. That's something I'll have to work on for the prefix search feature and see how to not make it collide with the shortcut feature and the vim-based navigation in the menu (maybe one of the other, or a chord to launch the search)
• It would be nice to but the Back feature that I have (https://github.com/gbataille/password-organizer/blob/master/password_organizer/menu.py#L49) in the lib
• I'm missing the highlighting of the currently selected answer, but I guess that's just a default config/style I have to change somewhere ...

I'll try and do individual issues/PR in your repo for all those points, unless you feel otherwise

Cheers

[gbataille]

pending work here https://github.com/gbataille/questionary/tree/prefix_filter_search