* Re: master 7fc0292: Allow completion styles to adjust completion metadata
[not found] ` <20191026121259.B54E720664@vcs0.savannah.gnu.org>
@ 2019-10-26 16:12 ` Stefan Monnier
2019-10-26 16:59 ` João Távora
0 siblings, 1 reply; 2+ messages in thread
From: Stefan Monnier @ 2019-10-26 16:12 UTC (permalink / raw
To: emacs-devel; +Cc: João Távora
> +(cl-defgeneric completion-adjust-metadata-for-style (style metadata)
> + "Adjust METADATA of current completion according to STYLE."
> + (:method (_style _metadata) nil) ; nop by default
Hmm... if "nop" is to return nil, it means it works by side-effect, but
if the metadata is `nil` to start with, there's no side-effect that can
turn it into a non-nil value, right?
So I think it should work by returning a new metadata and hence "nop"
should be to return `metadata` unmodified.
> + (let ((alist (cdr metadata)))
> + (setf (alist-get 'display-sort-function alist)
> + (compose-flex-sort-fn (alist-get 'display-sort-function alist)))
> + (setf (alist-get 'cycle-sort-function alist)
> + (compose-flex-sort-fn (alist-get 'cycle-sort-function alist)))
This works by side-effecting the alist, but those entries may (and
usually) come from immediate constants in the code, so this is
like "self-modifying code" :-(
> + metadata))))
I see here you do return the metadata, good.
> + (result-and-style
> + (completion--some
> + (lambda (style)
> + (let ((probe (funcall (nth n (assq style
> + completion-styles-alist))
> + string table pred point)))
> + (and probe (cons probe style))))
> + (completion--styles metadata))))
> + (completion-adjust-metadata-for-style (cdr result-and-style) metadata)
> (if requote
But here it appears you're not using the return value, unless I'm
missing something.
Stefan
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: master 7fc0292: Allow completion styles to adjust completion metadata
2019-10-26 16:12 ` master 7fc0292: Allow completion styles to adjust completion metadata Stefan Monnier
@ 2019-10-26 16:59 ` João Távora
0 siblings, 0 replies; 2+ messages in thread
From: João Távora @ 2019-10-26 16:59 UTC (permalink / raw
To: Stefan Monnier; +Cc: emacs-devel
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You're right, this version didn't work for many reasons. Once we get
cl-defgeneric to work, we can fix it to work by return value, as you
suggest...
João
On Sat, Oct 26, 2019, 17:12 Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> > +(cl-defgeneric completion-adjust-metadata-for-style (style metadata)
> > + "Adjust METADATA of current completion according to STYLE."
> > + (:method (_style _metadata) nil) ; nop by default
>
> Hmm... if "nop" is to return nil, it means it works by side-effect, but
> if the metadata is `nil` to start with, there's no side-effect that can
> turn it into a non-nil value, right?
>
> So I think it should work by returning a new metadata and hence "nop"
> should be to return `metadata` unmodified.
>
> > + (let ((alist (cdr metadata)))
> > + (setf (alist-get 'display-sort-function alist)
> > + (compose-flex-sort-fn (alist-get 'display-sort-function
> alist)))
> > + (setf (alist-get 'cycle-sort-function alist)
> > + (compose-flex-sort-fn (alist-get 'cycle-sort-function
> alist)))
>
> This works by side-effecting the alist, but those entries may (and
> usually) come from immediate constants in the code, so this is
> like "self-modifying code" :-(
>
> > + metadata))))
>
> I see here you do return the metadata, good.
>
> > + (result-and-style
> > + (completion--some
> > + (lambda (style)
> > + (let ((probe (funcall (nth n (assq style
> > + completion-styles-alist))
> > + string table pred point)))
> > + (and probe (cons probe style))))
> > + (completion--styles metadata))))
> > + (completion-adjust-metadata-for-style (cdr result-and-style)
> metadata)
> > (if requote
>
> But here it appears you're not using the return value, unless I'm
> missing something.
>
>
> Stefan
>
>
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[not found] ` <20191026121259.B54E720664@vcs0.savannah.gnu.org>
2019-10-26 16:12 ` master 7fc0292: Allow completion styles to adjust completion metadata Stefan Monnier
2019-10-26 16:59 ` João Távora
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