Re: which one to use: custom-set-variables, customize-set-variable, or customize-set-value?

[Alan Schmitt <alan.schmitt@polytechnique.org>]

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On 2015-11-30 16:20, Drew Adams <drew.adams@oracle.com> writes:

> Here is one example of a :set function (from character-fold+.el)
> that does something more than just change the value:
>
> (defcustom char-fold-symmetric nil
>   "Non-nil means char-fold searching treats equivalent chars the same.
> That is, use of any of a set of char-fold equivalent chars in a search
> string finds any of them in the text being searched.
>
> If nil then only the \"base\" or \"canonical\" char of the set matches
> any of them.  The others match only themselves, even when char-folding
> is turned on."
>   :set (lambda (sym defs)
>          (custom-set-default sym defs)
>          (update-char-fold-table))
>   :type 'boolean :group 'isearch)
>
> Standard function `custom-set-default' is the usual way to change
> the variable's (default) value, so this :set function firt calls
> that.  Then it calls a function that changes some other state,
> taking the new variable value into account.

Ah, very interesting. Thanks for the explanation.

Alan

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