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customize-themes doesn't allow backquote or :inherit

From: Yavuz
Subject: customize-themes doesn't allow backquote or :inherit
Date: Sun, 17 Oct 2010 18:47:29 +0000 (UTC)
User-agent: Loom/3.14 (http://gmane.org/)

I have been trying out the customize-themes feature, and converting a
color-theme that I have to the new format. The problem I have is how to use
color variables instead of "#RRGGBB" type constants to ease design and
maintenance of themes. Initially I thought I could use something like:

(deftheme mytheme)
(defvar nice-color "#123456")
(custom-theme-set-faces 'mytheme
  `(default ((t (:foreground ,nice-color))))
(provide-theme 'mytheme)

However, it seems that the load-theme function in custom.el has some code that
checks for the presence of 'quote and throws a 'Unsafe expression in theme
settings' error if I try to use ` instead of '.

Being an elisp newbie, my attempts to bypass is with various combinations of
eval, apply, and `' ended in failure.

Is there a way to use variables in custom-theme-set-faces? Or is that check
really need to be that strict? Maybe backquote would be acceptable as well?

Thanks in advance,

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