GNU bug report logs - #57003
28.1.90; Can local variables be loaded before loading major mode?

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From: Ihor Radchenko <yantar92 <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 57003 <at> debbugs.gnu.org
Subject: bug#57003: 28.1.90; Can local variables be loaded before loading major mode?
Date: Tue, 09 Aug 2022 19:29:49 +0800

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Sorry, phrased that all wrong -- I meant that if we had a mechanism to
> read the dir-locals earlier, then if you make the variables
> permanently-local, then things would indeed work fine without any
> further scaffolding here.
>
> So perhaps we should just allow that, but I'm not sure how we'd specify
> this.

I am not sure what you mean by earlier.

The first thing executed when activating a major-mode is (according to
define-derived-mode) kill-all-local-variables which consist of

  run_hook (Qchange_major_mode_hook);
  reset_buffer_local_variables (current_buffer, 0);
  bset_update_mode_line (current_buffer);

Having 'permanent-local variables will only affect
change-major-mode-hook. I know no other hook ran earlier.

Why not instead add something that is run _after_
kill-all-local-variables? Then, there will be no need to fiddle with
'permanently-local (which might have undesired side effects).

Best,
Ihor

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