the_forum shortcode

    /** Forum shortcodes ******************************************************/

    /**
     * Display an index of all visible root level forums in an output buffer
     * and return to ensure that post/page contents are displayed first.
     *
     * @since bbPress (r3031)
     *
     * @param array $attr
     * @param string $content
     * @uses bbp_has_forums()
     * @uses current_theme_supports()
     * @uses get_template_part()
     * @return string
     */
    public function display_forum_index( $attr ) {

        //Use the $tumbledata global to check for breadcrumbs inclusion
        global $tumbledata;

        extract(shortcode_atts( array(  'breadcrumbs'   =>  'true',
                        'recent_topics' =>  'true' ),
        $attr));

        // Unset globals
        $this->unset_globals();

        // Start output buffer
        $this->start( 'bbp_forum_archive' );

        if($tumbledata['activate_breadcrumbs_block'] == 1) {

            if ( $breadcrumbs == 'true' ) {

                // Get Primary Header
                bbp_get_template_part( 'bbpress/content',   'forum-header' );

            }

        }

        // Template notices
        do_action( 'bbp_template_notices' );

        // Before forums index
        do_action( 'bbp_template_before_forums_index' );

        // Load the forums index
        if ( bbp_has_forums() )
            bbp_get_template_part( 'bbpress/content', 'archive-forum' );

        // No forums
        else
            bbp_get_template_part( 'bbpress/feedback', 'no-forums'    );

        // After forums index
        do_action( 'bbp_template_after_forums_index' );

        if($tumbledata['activate_topics_home_block'] == 1) {

            if ( $recent_topics == 'true' ) {

                // List Topics
                bbp_get_template_part( 'bbpress/loop', 'topics-custom' );

            }

        }

        // Return contents of output buffer
        return $this->end();
    }