Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/relevanssi-premium/lib/compatibility/memberpress.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * /lib/compatibility/memberpress.php
+ *
+ * Memberpress compatibility features.
+ *
+ * @package Relevanssi
+ * @author  Mikko Saari
+ * @license https://wordpress.org/about/gpl/ GNU General Public License
+ * @see     https://www.relevanssi.com/
+ */
+
+add_filter( 'relevanssi_post_ok', 'relevanssi_memberpress_compatibility', 10, 2 );
+
+/**
+ * Checks whether the user is allowed to see the post.
+ *
+ * @param boolean $post_ok Can the post be shown to the user.
+ * @param int     $post_id The post ID.
+ *
+ * @return boolean $post_ok True if the user is allowed to see the post,
+ * otherwise false.
+ */
+function relevanssi_memberpress_compatibility( $post_ok, $post_id ) {
+	$post = get_post( $post_id );
+	if ( MeprRule::is_locked( $post ) ) {
+		$post_ok = false;
+	}
+
+	return $post_ok;
+}