From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Moe <mail@christianmoe.com>
Subject: Re: ODT export custom link colors?
Date: Wed, 14 Dec 2011 21:38:13 +0100
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To: Gary Oberbrunner <garyo@oberbrunner.com>
Cc: Orgmode Mailing List <emacs-orgmode@gnu.org>

Hi,

I'm not sure about this, because I don't really know the ODT spec, but 
I *think* you will have to define an ODT Character style for *each* 
color you want to use, using a consistent convention for naming these 
styles.

For instance, in the LibreOffice Styles and Formatting window, choose 
the Character styles tab, right-click on Default, select New. Name 
your style (e.g.) "Bgcolor red". Right-click it, select Modify, in the 
Background tab give it a red background.

Repeat for other colors you use, e.g. "Bgcolor blue", "Bgcolor yellow"...

Now, modify your custom link code as follows:

> (org-add-link-type
> "bgcolor"  nil
>    (lambda (path desc format)
>     (cond
>      ((eq format 'html)
>       (format"<span style=\"background-color:%s;\">%s</span>"  path desc))
>      ((eq format 'latex)
>       (format"\\colorbox{%s}{%s}"  path desc))
     ((eq format 'odt)
      (format "<text:span text:style-name=\"Bgcolor 
%s\">%s</text:span>" path desc))
>      (t
>       (format"BGCOLOR LINK (%s): {%s}{%s}"  format path desc)))))
>

(You can change the style-name in the format string to follow whatever 
naming convention you've adopted for your styles. If you want to call 
them simply "red", "blue" and so on, it would be text:style-name=\"%s\".)

(Judging from the manual, if you have space in your style names, like 
above, you should perhaps escape the spaces with _20_, but the 
"Bgcolor %s" above seems to work fine.)

Please report back if this works for you. If so, and depending on what 
Jambunathan might have to add, I'll look into updating the Worg examples.

> (By the way, before I added my 't' case above, it returned nil, which
> caused the odt exporter to blow up with an unhelpful error.  Would a
> patch for that be considered too much of a corner-case?  I'd be happy
> to submit one.)

I don't know what others think, but I think the habit of always 
providing one's custom links with an explicit fallback should be 
encouraged, if necessary by rude reminders from failing exporters...
:-)

hth,
Christian