On Thu, Nov 29, 2012 at 1:20 AM, Jambunathan K <kjambunathan@gmail.com> wrote:

Nick Dokos <nicholas.dokos@hp.com> writes:

> 42 147 <aeuster@gmail.com> wrote:
>
>> Very nice.
>>
>> However, I'd like to write a function that toggles the color value (without
>> recourse to the customize menu), since it would be useful to highlight the
>> footnotes from time to time.
>>
>
> Anything that can be done interactively can also be done
> programatically. You know what face you are dealing with, you can get
> its foreground color with face-foreground, and you can set it with
> set-face-attribute. A crude implementation to show the basic outline:
>
>

> (setq org-footnote-fg-color (face-foreground 'org-footnote))
>
> (setq org-text-fg-color (face-foreground 'default))
>
> (defun my-toggle-footnote-fg-color ()
> "Toggle the org-footnote face foreground color."
> (interactive)
> (let ((fg (face-foreground 'org-footnote)))
> (if (string-equal fg org-footnote-fg-color)
> (set-face-attribute 'org-footnote nil :foreground org-text-fg-color)
> (set-face-attribute 'org-footnote nil :foreground org-footnote-fg-color))))
>
>

> The difficulties start (but do not end) with footnotes in all sorts of
> weird places (e.g. headlines) with all sorts of different
> fontifications. You'd want to blend the footnote with its immediate
> surroundings.
>
> Taking care of such situations (and various others that the above code
> mishandles) is left as an exercise...

Install the following defun, put the cursor on fontified text and do M-x
toggle-face.

(defun toggle-face (&optional face-from)
(interactive (list (read-face-name "Face" (face-at-point))))
(let ((f (assq face-from face-remapping-alist))
(face-to 'default))
(if f (setq face-remapping-alist (delq f face-remapping-alist))
(push (cons face-from face-to) face-remapping-alist))))

See also (info "(elisp) Face Remapping")

> Nick
>
>

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