Exception when multiple plugins use Twig

When other plugins autoload Twig, it causes SocialSharing_Core_Module::registerTwigFunctions() to be hit in a recursive fashion. Wrapping each of the calls to $twig->addFunction() in that method with a try / catch resolves the \LogicException that would otherwise result on the outer recursion.

try {
    $twig->addFunction(
        new Twig_SimpleFunction(
            'plugin_directory_url',
            array($this, 'getPluginDirectoryUrl')
        )
    );
}
catch(\LogicException $e) {
    // Do nothing - function has already been added
}

Rinse and repeat for “get_posts“, “ucfirst“, and “wp_get_attachment_image_url“.

Tangentially, your extension functions should really be namespaced, like “ssbbs_plugin_directory_url“, or you might bump heads with someone else who shares your preference for generic function names.