Merged in feature/plugins-update (pull request #9)

wp plugin updates from pantheon

* wp plugin updates from pantheon

wp/wp-content/plugins/facetwp/includes/class-diff.php

@@ -0,0 +1,73 @@
+<?php
+
+class FacetWP_Diff
+{
+
+    /**
+     * Compare "facetwp_settings" with "facetwp_settings_last_index" to determine
+     * whether the user needs to rebuild the index
+     * @since 3.0.9
+     */
+    function is_reindex_needed() {
+        $s1 = FWP()->helper->load_settings();
+        $s2 = FWP()->helper->load_settings( true );
+
+        // Compare settings
+        $to_check = [ 'thousands_separator', 'decimal_separator', 'wc_enable_variations', 'wc_index_all' ];
+
+        foreach ( $to_check as $name ) {
+            $attr1 = $this->get_attr( $name, $s1['settings'] );
+            $attr2 = $this->get_attr( $name, $s2['settings'] );
+            if ( $attr1 !== $attr2 ) {
+                return true;
+            }
+        }
+
+        // Get facets, removing non-indexable ones
+        $f1 = array_filter( $s1['facets'], [ $this, 'is_indexable' ] );
+        $f2 = array_filter( $s2['facets'], [ $this, 'is_indexable' ] );
+
+        // The facet count is different
+        if ( count( $f1 ) !== count( $f2 ) ) {
+            return true;
+        }
+
+        // Sort the facets alphabetically
+        usort( $f1, function( $a, $b ) {
+            return strcmp( $a['name'], $b['name'] );
+        });
+
+        usort( $f2, function( $a, $b ) {
+            return strcmp( $a['name'], $b['name'] );
+        });
+
+        // Compare facet properties
+        $to_check = [ 'name', 'type', 'source', 'source_other', 'parent_term', 'hierarchical', 'modifier_type', 'modifier_values' ];
+
+        foreach ( $f1 as $index => $facet ) {
+            foreach ( $to_check as $attr ) {
+                $attr1 = $this->get_attr( $attr, $facet );
+                $attr2 = $this->get_attr( $attr, $f2[ $index ] );
+                if ( $attr1 !== $attr2 ) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+
+    function is_indexable( $facet ) {
+        return ! in_array( $facet['type'], [ 'search', 'pager', 'reset', 'sort' ] );
+    }
+
+
+    /**
+     * Get an array element
+     * @since 3.0.9
+     */
+    function get_attr( $name, $collection ) {
+        return $collection[ $name ] ?? false;
+    }
+}