// Register a custom image size for featured images on single Posts
add_image_size( 'post-single', 1200, 300, true );

// Create a shortcode that outputs the URL of author page for the entry author outside the loop
add_shortcode( 'post_author_posts_link_outside_loop', 'sk_post_author_posts_link_shortcode' );
/**
 * Produces the author of the post (link to author archive).
 *
 * Supported shortcode attributes are:
 *   after (output after link, default is empty string),
 *   before (output before link, default is empty string).
 *
 * Output passes through 'genesis_post_author_posts_link_shortcode' filter before returning.
 *
 * @since 1.1.0
 *
 * @param array|string $atts Shortcode attributes. Empty string if no attributes.
 * @return string Shortcode output
 */
function sk_post_author_posts_link_shortcode( $atts ) {

	if ( ! is_singular() ) {
		return;
	}

	$defaults = array(
		'after'  => '',
		'before' => '',
	);

	$atts = shortcode_atts( $defaults, $atts, 'post_author_posts_link_outside_loop' );

	global $post;
	$author_id = $post->post_author;
	$author = get_the_author_meta( 'display_name', $author_id );
	$url = get_author_posts_url( $author_id );

	if ( genesis_html5() ) {
		$output  = sprintf( '<span %s>', genesis_attr( 'entry-author' ) );
		$output .= $atts['before'];
		$output .= sprintf( '<a href="%s" %s>', $url, genesis_attr( 'entry-author-link' ) );
		$output .= sprintf( '<span %s>', genesis_attr( 'entry-author-name' ) );
		$output .= esc_html( $author );
		$output .= '</span></a>' . $atts['after'] . '</span>';
	} else {
		$link   = sprintf( '<a href="%s" rel="author">%s</a>', esc_url( $url ), esc_html( $author ) );
		$output = sprintf( '<span class="author vcard">%2$s<span class="fn">%1$s</span>%3$s</span>', $link, $atts['before'], $atts['after'] );
	}

	return apply_filters( 'genesis_post_author_posts_link_shortcode', $output, $atts );

}