Adding compatibility with WPUF

Hi,

right now there’s a problem when using WordPress User Frontend plugin, which is that they create the post on the front-end, so the global $post_id doesn’t belong to the post being created, but to their page from which to create the post (where shortcode [wpuf_addpost] goes)

So then I fixed this issue: if creating a post in the frontend, the $post_id is different

Maybe if this solution is not justified, it would be nice to add a filter in that place, so we can add a hook without having to hack the code

Can this be added to the main code? Thanks!

file: template-tags.php

function get_coauthors( $post_id = 0 ) {
	global $post, $post_ID, $coauthors_plus, $wpdb;

	$coauthors = array();
	$post_id = (int)$post_id;
	if ( !$post_id && $post_ID )
		$post_id = $post_ID;
	if ( !$post_id && $post )
		$post_id = $post->ID;

	if ( $post_id ) {
		$coauthor_terms = get_the_terms( $post_id, $coauthors_plus->coauthor_taxonomy );

		if ( is_array( $coauthor_terms ) && !empty( $coauthor_terms ) ) {
			foreach( $coauthor_terms as $coauthor ) {
				$coauthor_slug = preg_replace( '#^cap\-#', '', $coauthor->slug );
				$post_author =  $coauthors_plus->get_coauthor_by( 'user_nicename', $coauthor_slug );
				// In case the user has been deleted while plugin was deactivated
				if ( !empty( $post_author ) )
					$coauthors[] = $post_author;
			}
		} else if ( !$coauthors_plus->force_guest_authors ) {
			// Hack: for old posts, the plugin didn't save the Author in the terms, so it's missing
			// This creates a bug: for WPUF frontend, global $post is the page to edit the post, and not the post, so it takes that one
			// Ask before if there's a $post_id, since this one is the right one for the post
			if ( !is_admin()) {
				$post_from_post_id = get_post($post_id);
				$post_author = get_userdata( $post_from_post_id->post_author );
			}
			elseif ( $post ) {
				$post_author = get_userdata( $post->post_author );
			} else {
				$post_author = get_userdata( $wpdb->get_var( $wpdb->prepare("SELECT post_author FROM $wpdb->posts WHERE ID = %d", $post_id ) ) );
			}
			if ( !empty( $post_author ) )
				$coauthors[] = $post_author;
		} // the empty else case is because if we force guest authors, we don't ever care what value wp_posts.post_author has.
	}
	return $coauthors;
}

https://wordpress.org/plugins/co-authors-plus/