On Tue, Jun 2, 2020 at 4:40 PM Tassilo Horn <tsdh@gnu.org> wrote:

> >   (add-hook 'icomplete-minibuffer-setup-hook 'my-flex-styles)
> >   (defun my-flex-styles () (setq-local completion-styles '(initials
flex)))
> >
> > Or just use a lambda, which is even shorter.  I'd like to avoid a
> > duplicate version of completion-styles customization vars.
>
> I guess fido-mode sets `completion-styles' locally in order to achieve
> ido-like defaults, right?

Yes, exactly. fido-mode is broadly "choose these nice icomplete-mode
settings that make it fake ido-mode".

> But as a user with customized
> `completion-styles' and `completion-category-overrides', I wish there
> was a simple way to just use them with fido, too.

You can try icomplete-mode directly if you don't like fido-mode's.
fido-mode is a small customization layer on top of it that makes
some choices for you.

> Especially, I can't
> see how I could figure out the right category override.  Is the
> completion metadata accessible in icomplete-minibuffer-setup-hook?

I don't know what you mean.  Exactly what are you trying do to?
Anyway, I'm reasonably confident you can set
completion-category-overrides there.

> I would like to use fido (more than icomplete) because the keybindings
> suite my intuition but I'd like to keep my completion styles and
> overrides as I have them.

If (some of the keybindings) are the only thing that interest you,
you can bind them to icomplete-minibuffer-map.  The only thing
you can't do this way is this bit of behaviour hidden in
`icomplete--sorted-completions'

((and fido-mode
                             (not minibuffer-default)
                             (eq (icomplete--category) 'file))
                        ;; `fido-mode' has some extra file-sorting
                        ;; semantics even if there isn't a default,
                        ;; which is to bubble "./" to the top if it
                        ;; exists.  This makes M-x dired RET RET go to
                        ;; the directory of current file, which is
                        ;; what vanilla Emacs and `ido-mode' both do.
                        `(,(lambda (comp)
                             (string= "./" comp))))

But _that_ could be controlled by an icomplete variable or some
other category technique.

Also, you can argue for some of the defaults in icomplete to be
changed, slowly.