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From: Eli Zaretskii <eliz@gnu.org>
To: Juri Linkov <juri@linkov.net>
Cc: sadiq@sadiqpk.org, monnier@iro.umontreal.ca, 60176@debbugs.gnu.org
Subject: bug#60176: 29.0.60; Fallback file variable mode if treesitter is not usable
Date: Mon, 19 Dec 2022 19:47:03 +0200	[thread overview]
Message-ID: <83v8m7cmlk.fsf@gnu.org> (raw)
In-Reply-To: <86o7rzfivi.fsf@mail.linkov.net> (message from Juri Linkov on Mon, 19 Dec 2022 19:29:13 +0200)

> From: Juri Linkov <juri@linkov.net>
> Cc: sadiq@sadiqpk.org,  monnier@iro.umontreal.ca,  60176@debbugs.gnu.org
> Date: Mon, 19 Dec 2022 19:29:13 +0200
> 
> >> So to completely cover all needs, 'major-mode-remap-alist' should
> >> support a predicate as well.  For example,
> >>
> >> (setq major-mode-remap-alist '((c-mode #'treesit-available-p c-ts-mode)))
> >
> > I think the idea is that this should happen by default, not as a
> > (not-so-trivial) customization by the users.
> 
> Then 'c-ts-mode' should fall back to 'c-mode' when treesit is not available?
> Like this:
> 
> ```
> diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
> index cf941236f82..5004b9a5e1d 100644
> --- a/lisp/progmodes/c-ts-mode.el
> +++ b/lisp/progmodes/c-ts-mode.el
> @@ -616,7 +616,7 @@ c-ts-mode
>  (define-derived-mode c-ts-mode c-ts-base-mode "C"
>  
>    (unless (treesit-ready-p 'c)
> -    (error "Tree-sitter for C isn't available"))
> +    (c-mode))

Yes.  But not literally like that, because, for example, we don't want
that to happen when c-ts-mode is invoked interactively by the user --
in that case we do want to signal an error.

The automatic fallback should IMO happen only in situations like mode
specifications in 'mode' cookies or file-local variables, where it is
better to visit in a similar mode than completely fail visiting a
file.





  reply	other threads:[~2022-12-19 17:47 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-18 12:07 bug#60176: 29.0.60; Fallback file variable mode if treesitter is not usable Mohammed Sadiq
2022-12-19  7:39 ` Juri Linkov
2022-12-19 12:35   ` Eli Zaretskii
2022-12-19 13:12     ` Mohammed Sadiq
2022-12-19 16:43     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-01-09 17:30       ` Juri Linkov
2023-01-09 17:57         ` Eli Zaretskii
2023-01-09 23:06         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-01-10 12:55           ` Eli Zaretskii
2023-01-10 14:29             ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-01-10 18:08             ` Juri Linkov
2023-01-10 18:21               ` Eli Zaretskii
2023-01-16 17:32                 ` Juri Linkov
2023-01-16 18:21                   ` Eli Zaretskii
2023-01-16 18:36                     ` Juri Linkov
2023-01-16 19:26                       ` Eli Zaretskii
2023-01-17  7:33                         ` Juri Linkov
2023-01-17 12:07                           ` Eli Zaretskii
2022-12-19 17:29     ` Juri Linkov
2022-12-19 17:47       ` Eli Zaretskii [this message]
2022-12-21  4:35 ` Yuan Fu

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