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Let say we have theme function in module A theme_super_a(), this function returning some HTML. I want to write function in my own module (let's call it B) where I can get output of theme_super_a() manipulate it and return back to Drupal theme system. How can I do it?

Notice that I'm not interested in overriding whole theme with hook_theme_registry_alter(&$theme_registry).

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    If you're not willing to use the function provided for doing EXACTLY what you want to do, then you're not going to achieve your goal. – Chapabu Feb 20 '13 at 10:19
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You will need to override the whole theme function in your own module. Because the override is done from a module level, not the theme, you will probably need hook_theme_registry_alter to change the theme function settings for that specific hook_theme component.

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