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Re: Custom dependencies

From: Stefan Monnier
Subject: Re: Custom dependencies
Date: Tue, 08 Apr 2003 14:35:50 -0400

> So, let's see.  We have (defcustom A ... :set-after '(B) ... :set
> ...something.long.here...).  And Dave suggests to call the :set
> function from A after B has changed.  So whenever a variable X is
> changed, we have to look through all other variables Y to see if they
> mention X in the :set-after list.

No need for a "global search": you just need to do

        (push 'A (get 'B 'custom-reset-after-update))

when evaluating A's defcustom.

> My thinking was as follows: (utf-translate-cjk-mode -1) clears the
> hash table so that CJK unification is not done.  A subsequent
> (utf-translate-cjk-mode 1) statement would then look at
> current-language-environment and populate the hash table accordingly.

(utf-translate-cjk-mode 1) might also begin by clearing the hash-table.
Some minor modes try to optimize the case where "the mode was already
ON", but I think it's generally cleaner and more robust not to try and
be clever.


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