make_site_theme() WordPress Function

function make_site_theme() {
	// Name the theme after the blog.
	$theme_name = __get_option( 'blogname' );
	$template   = sanitize_title( $theme_name );
	$site_dir   = WP_CONTENT_DIR . "/themes/$template";

	// If the theme already exists, nothing to do.
	if ( is_dir( $site_dir ) ) {
		return false;
	}

	// We must be able to write to the themes dir.
	if ( ! is_writable( WP_CONTENT_DIR . '/themes' ) ) {
		return false;
	}

	umask( 0 );
	if ( ! mkdir( $site_dir, 0777 ) ) {
		return false;
	}

	if ( file_exists( ABSPATH . 'wp-layout.css' ) ) {
		if ( ! make_site_theme_from_oldschool( $theme_name, $template ) ) {
			// TODO: rm -rf the site theme directory.
			return false;
		}
	} else {
		if ( ! make_site_theme_from_default( $theme_name, $template ) ) {
			// TODO: rm -rf the site theme directory.
			return false;
		}
	}

	// Make the new site theme active.
	$current_template = __get_option( 'template' );
	if ( WP_DEFAULT_THEME == $current_template ) {
		update_option( 'template', $template );
		update_option( 'stylesheet', $template );
	}
	return $template;
}