/**
 * Template tag:
 * Get <title> text
 * Use as <title><?php echo get_site_title( '-' ); ?></title>
 * @param  string $separator String separator
 * @return string            title text
 */
function get_site_title( $separator = ' – ' ) {
    global $wp_query;

    $title = array();

    // global site title
    $title['global'] = get_bloginfo( 'name' );

    // single / page
    $title['single'] = ( is_single() || is_page() ) ? get_the_title() : 0;

    // custom post type
    $title['post_type'] = 0;
    if( !empty( $wp_query->query['post_type'] ) ) {
        $post_type = get_post_type_object( $wp_query->query['post_type'] );
        $title['post_type'] = $post_type->labels->name;
    }

    // paged
    $title['paged'] = ( !empty( $wp_query->query['paged'] ) ) ? __( 'Page' ) . ' ' . $wp_query->query['paged'] : 0;

    // date archive
    $title['date'] = 0;
    if( is_date() ) {
        if( is_year() ) {
            $title['date'] = $wp_query->query['year'];
        }

        if( is_month() ) {
            $title['date'] = $wp_query->query['monthnum'] . $separator . $wp_query->query['year'];
        }

        if( is_day() ) {
            $title['date'] = $wp_query->query['day'] . $separator . $wp_query->query['monthnum'] . $separator . $wp_query->query['year'];
        }
    }

    // tags
    $title['tag'] = ( is_tag() ) ? __( 'Tag' ) . ': ' . single_cat_title( '', false ) : 0;

    //categories
    $title['tag'] = ( is_category() ) ? __( 'Category' ) . ': ' . single_cat_title( '', false ) : 0;

    // custom taxonomy terms
    $title['term'] = 0;
    if( !empty( $wp_query->query_vars['term'] ) ) {
        $taxonomy_labels = get_taxonomy_labels( get_taxonomy( $wp_query->query_vars['taxonomy'] ) );
        $term = get_term_by( 'slug', $wp_query->query_vars['term'], $wp_query->query_vars['taxonomy'] );
        if( $taxonomy_labels && $term ) {
            $title['term'] = $taxonomy_labels->name . ': ' . $term->name;
        }
    }

    // author
    $title['author'] = 0;
    if( !empty( $wp_query->query['author_name'] ) ) {
        $author = get_user_by( 'slug', $wp_query->query['author_name'] );
        $title['author'] = $author->first_name . ' ' . $author->last_name;
    }

    $title_string = '';
    $title_string .= ( $title['single'] ) ? $title['single'] . $separator : '';
    $title_string .= ( $title['term'] ) ? $title['term'] . $separator : '';
    $title_string .= ( $title['tag'] ) ? $title['tag'] . $separator : '';
    $title_string .= ( $title['post_type'] ) ? $title['post_type'] . $separator : '';
    $title_string .= ( $title['date'] ) ? $title['date'] . $separator : '';
    $title_string .= ( $title['author'] ) ? $title['author'] . $separator : '';
    $title_string .= ( $title['paged'] ) ? $title['paged'] . $separator : '';
    $title_string .= $title['global'];

    return $title_string;
}