Re: [Emacs-diffs] scratch/new-flex-completion-style 2c75775 2/2: Score, sort and annotate flex-style completions according to match tightness

[Dmitry Gutov <dgutov@yandex.ru>]

On 11.03.2019 03:15, Stefan Monnier wrote:
> Of course, if we're careful we can try and tune the weighting of the
> types of scores so that both scoring have a visible impact, but I have
> the impression that it's going to require too careful tuning to be
> usable in practice.

While possible, I think in practice it will require using just one 
combined sorting function, instead of passing the list of completions 
though several independent sorting functions. Although please feel free 
to prove me wrong, because I like the list-of-functions approach.

> Ah, we could yes.  That's equivalent to using another global var, indeed.
> Currently we use global vars (completion-styles and
> completion-cycle-threshold) for that purpose, mostly by accident.

Fair enough.

completion-sort-functions, then?

> I'm afraid that if we drop the display-sort and use cycle-sort
> everywhere, there's going to be a very strong reaction from users not
> appreciating the change.  Even more so if the heuristic is poor.

In that case I'd suggest dropping cycle-sort and, for now, keeping 
display-sort behavior as is. But make additional sorting configurable 
like we've been discussing, via completion-sort-functions, as well as 
package/user overrides in completion-category-*.