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Re: buffer-local variables and state information

From: Štěpán Němec
Subject: Re: buffer-local variables and state information
Date: Sun, 11 Sep 2011 22:05:03 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

On Sun, 11 Sep 2011 18:25:26 +0200
Le Wang wrote:

> Is it considered generally acceptable to store state information, for
> example, from a minor-mode in a buffer-local variable?


> However, recently, I discovered that changing major-modes would
> actually kill all buffer-local variables, which would leave my
> minor-mode in an invalid state.  So I've been doing it wrong?

Not necessarily.

If the variable in question should persist across major mode changes,
you can set its `permanent-local' property, e.g.

  (put 'variable 'permanent-local t)

That will make it exempt from the buffer-local variable slaughter.


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