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bug#11059: 24.0.94; Please add `face-spec-set' to the elisp manual

From: Michael Heerdegen
Subject: bug#11059: 24.0.94; Please add `face-spec-set' to the elisp manual
Date: Wed, 11 Apr 2012 19:05:28 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

Hello Chong,

> Promoting the use of face-spec-set in third party code is probably not a
> good idea.  That function is pretty internal; its role is actually to
> apply the face spec, and it assumes that the caller has done some of the
> relevant bookkeeping in symbol properties like `face-defface-spec' and
> `saved-face', so that the Custom interface doesn't get confused.

Mmh, ok - then maybe we find a better solution.

> Could you give an example of why your code wants to redefine face
> specs?  In most cases, I suspect face remapping is the better
> solution.

In my case, face remapping is not an alternative.  What I want is, I
think, a quite common user wish: redefine faces in my .emacs.  For

   '((((background dark)) (:background "grey7"))
     (t                   (:background "#f0f0f0"))))
  (let ((sat-increment -65)
        (val-increment -35))
     `((((background dark)) (:foreground ,(icicle-increment-color-saturation 
"orange red" sat-increment)))
       (t (:foreground ,(icicle-increment-color-value "orange red" 
     `((((background dark)) (:foreground ,(icicle-increment-color-saturation 
"blue" sat-increment)))
       (t (:foreground ,(icicle-increment-color-value "blue" val-increment)))))

I can't do this with face remapping, because it accepts only
attribute/value pairs as specification, but I want to completely
redefine it for different background modes etc.

> > And `custom-set-faces' is deprecated - at least, the custom file
> > warns to use it:
> >
> > ;; custom-set-faces was added by Custom.
> > ;; If you edit it by hand, you could mess it up, so be careful.
> > ;; Your init file should contain only one such instance.
> > ;; If there is more than one, they won't work right.
> This does not say that it is deprecated, only that it is meant to store
> the result of the user's use of the Custom interface.

I don't want to use Custom for this (I don't use it at all), since I
want to be able to calculate the face description in my .emacs.  Like in
the second example, where I want to be able to change the color without
the need to apply the washing of the color again (which is done with
`icicle-increment-color-saturation' and `icicle-increment-color-value').

I know that I _can_ use `custom-set-faces' explicitly in .emacs for this
purpose - that works.  But is this really the right function for users
to use in their .emacs to redefine faces?  If yes, the manual section
"Faces" should at least mention it.



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