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From: Daniel Mendler <mail@daniel-mendler.de>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Lars Ingebrigtsen <larsi@gnus.org>,
	22324@debbugs.gnu.org, Dmitry Gutov <dgutov@yandex.ru>
Subject: bug#22324: 25.0.50; completion-category-defaults style doesn't override completion-styles (gets prepended instead)
Date: Wed, 26 Jan 2022 14:49:48 +0100	[thread overview]
Message-ID: <184dffab-4fa4-e265-c8ef-0c088149b1b4@daniel-mendler.de> (raw)
In-Reply-To: <jwvczke8w23.fsf-monnier+emacs@gnu.org>

> We can probably have our cake and eat it too by adding a `fail`
> completion style.  Such a style would always take responsibility
> (i.e. would never return nil to delegate to subsequent styles), but
> would always return a "useless" value that gives no completions.
> 
> Then entries in `completion-category-override/defaults` could choose to
> either be mere additions to the global default (as now) or be a full
> override (which they'd get by having this `fail` style at the end).

This sounds like a good idea to solve the issue and retain backward
compatibility. It is like eating the cake backwards :) A `fail'
completion style is pretty trivial. It boils down to adding `(fail
ignore ignore "Fail with no completions")` to the
`completion-styles-alist`, or did I miss something?

>> Furthermore we've also got `completion-category-defaults`. It may make
>> sense to distinguish them by making the override a real override and
>> keep the current behavior for the defaults.
> 
> No, the role of those two is already quite different:
> `completion-category-defaults` is for packages to set, whereas
> `completion-category-override` is to be set by end-users.

I am aware of this distinction, but I chose to ignore it. Calling it
"quite different" feels like an exaggeration, given that Emacs is
supposed to be configurable throughout by the user - of course this is
only my interpretation. I usually override
`completion-category-defaults` since I want to control the completion
precisely myself and I don't like if packages interfere with that. But
this is probably a special preference of someone who wrote multiple
completion UIs and likes to tweak the Orderless matching behavior... ;)
As far as I know `completion-category-defaults` is not used widely. I
don't have a single package installed which makes use of this
functionality, but once again, this is probably not representative.

Daniel





  reply	other threads:[~2022-01-26 13:49 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-07 20:27 bug#22324: 25.0.50; completion-category-defaults style doesn't override completion-styles (gets prepended instead) Dmitry Gutov
2016-01-08 12:17 ` Eli Zaretskii
2016-01-08 12:21   ` Dmitry Gutov
2016-01-08 12:26     ` Eli Zaretskii
2016-01-08 12:30       ` Dmitry Gutov
2016-01-08 15:31         ` Eli Zaretskii
2021-12-02  9:10         ` Lars Ingebrigtsen
2021-12-02  9:45           ` Eli Zaretskii
2021-12-06  1:16           ` Dmitry Gutov
2021-12-06  2:25             ` Lars Ingebrigtsen
2021-12-07  1:35               ` Dmitry Gutov
2021-12-07 20:28                 ` Lars Ingebrigtsen
2021-12-07 22:46                   ` Dmitry Gutov
2021-12-09  1:09                     ` Lars Ingebrigtsen
2022-01-21 13:46                       ` Lars Ingebrigtsen
2022-01-24  2:03                         ` Dmitry Gutov
2022-01-24  9:46                           ` Lars Ingebrigtsen
2022-01-25  2:27                             ` Dmitry Gutov
2022-01-25 12:19                               ` Lars Ingebrigtsen
2022-01-26  1:43                                 ` Dmitry Gutov
2022-01-26  2:31                                   ` Daniel Mendler
2022-01-26 13:36                                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-26 13:49                                       ` Daniel Mendler [this message]
2022-01-26 17:19                                         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-26 18:59                                           ` Daniel Mendler
2022-01-26 22:57                                             ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-26 23:32                                               ` Daniel Mendler
2022-01-27  6:52                                                 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-28  2:35                                             ` Dmitry Gutov
2022-01-28 11:54                                               ` Daniel Mendler
2022-01-28 16:56                                               ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-28 22:06                                                 ` Dmitry Gutov
2022-01-28 23:18                                                   ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-29  1:57                                                     ` Dmitry Gutov
2022-01-28  2:37                                       ` Dmitry Gutov
2022-01-28 16:59                                         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-01-28 21:23                                           ` Dmitry Gutov
2022-01-28  2:39                                     ` Dmitry Gutov

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