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: Sat, 13 Aug 2022 17:02:56 +0800

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

>> 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).
>
> That'd work for things that use `define-derived-mode', but not all modes
> are defined that way and call `kill-all-local-variables' "manually".

I found such a case in ses.el. However, I am not sure if much can be
done mode-specifically in such scenario. Major modes using a custom
function may set the value of `major-mode' anywhere down to right before
`run-mode-hooks' call.

The only universal option then is indeed your suggestion about permanent
local variables. They were overridden by hack-local-variables in the
past anyway.

What can be probably done is a call to `hack-local-variables' inside
`kill-all-local-variables', but setting only the variables marked
'permanent-local. The later call to `hack-local-variables' inside
`run-mode-hooks' may then only go through the remaining variables.

WDYT?

-- 
Ihor Radchenko,
Org mode contributor,
Learn more about Org mode at https://orgmode.org/.
Support Org development at https://liberapay.com/org-mode,
or support my work at https://liberapay.com/yantar92

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