Set link text auto if not set in wp link picker

[trinef]

This field: http://d.pr/i/so9ffk
Something like:

/**
 * Get post title from URL if title is empty.
 *
 * @param array $link_values The link field array.
 */
function get_link_field_title( $link_values ) {

        if ( empty( $link_values['title'] ) && false !== strpos( $link_values['url'], home_url() ) ) {
		$linked_post = url_to_postid( $link_values['url'] );
		$link_title  = 0 === $linked_post ? '' : get_the_title( $linked_post );
	} elseif ( empty( $link_values['title'] ) ) {
		$link_title = $link_values['url'];
	} else {
		$link_title = $link_values['title'];
	}
	return $link_title;
}

Maybe it should be a helper function in core?

[walbo]

We should cache url_to_postid. See how WPCOM does it here https://github.com/Automattic/vip-go-mu-plugins/blob/52549ae9a392fc1343b7ac9dba4ebcdca46e7d55/vip-helpers/vip-caching.php#L252