All: Add Relevanssi plugin, remove broken search algorithm

Fixes #359
Closes #361
Closes #408

Author: mgol

mu-plugins/_loader.php

@@ -14,4 +14,5 @@
 }
 unset( $live_domain, $subdomain, $domain_specific_file, $type_specific_file );
 
+require_once WPMU_PLUGIN_DIR . '/relevanssi/relevanssi.php';
 require 'disable-emojis/disable-emojis.php';

mu-plugins/api-sites/search-weights.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Runs installation of Relevanssi plugin for current blog if it was not already installed.
+ */
+
+if (!get_current_blog_id() || get_option('jquery_relevanssi_installed', false)) {
+	return;
+}
+relevanssi_install();
+
+update_option( 'relevanssi_implicit_operator', 'AND' );
+update_option( 'relevanssi_index_post_types', array( 'post', 'page' ) );
+update_option( 'relevanssi_min_word_length', 2 );
+// Search terms highlighting may be buggy (try to search "wrap html" and see a page crash). Disabling it.
+update_option( 'relevanssi_excerpts', 'off' );
+
+// Will output success message. We don't want it to display.
+ob_start();
+relevanssi_build_index();
+ob_end_clean();
+
+update_option('jquery_relevanssi_installed', true);

mu-plugins/relevanssi-install.php

@@ -0,0 +1,77 @@
+<?php
+
+function relevanssi_purge_excerpt_cache($post) {
+	global $wpdb, $relevanssi_variables;
+	
+	$wpdb->query("DELETE FROM " . $relevanssi_variables['relevanssi_excerpt_cache'] . " WHERE post = $post");
+}
+
+function relevanssi_fetch_excerpt($post, $query) {
+	global $wpdb, $relevanssi_variables;
+
+	$query = mysql_real_escape_string($query);	
+	$excerpt = $wpdb->get_var("SELECT excerpt FROM " . $relevanssi_variables['relevanssi_excerpt_cache'] . " WHERE post = $post AND query = '$query'");
+	
+	if (!$excerpt) return null;
+	
+	return $excerpt;
+}
+
+function relevanssi_store_excerpt($post, $query, $excerpt) {
+	global $wpdb, $relevanssi_variables;
+	
+	$query = mysql_real_escape_string($query);
+	$excerpt = mysql_real_escape_string($excerpt);
+
+	$wpdb->query("INSERT INTO " . $relevanssi_variables['relevanssi_excerpt_cache'] . " (post, query, excerpt)
+		VALUES ($post, '$query', '$excerpt')
+		ON DUPLICATE KEY UPDATE excerpt = '$excerpt'");
+}
+
+function relevanssi_fetch_hits($param) {
+	global $wpdb, $relevanssi_variables;
+
+	$time = get_option('relevanssi_cache_seconds', 172800);
+
+	$hits = $wpdb->get_var("SELECT hits FROM " . $relevanssi_variables['relevanssi_cache'] . " WHERE param = '$param' AND UNIX_TIMESTAMP() - UNIX_TIMESTAMP(tstamp) < $time");
+	
+	if ($hits) {
+		return unserialize($hits);
+	}
+	else {
+		return null;
+	}
+}
+
+function relevanssi_store_hits($param, $data) {
+	global $wpdb, $relevanssi_variables;
+
+	$param = mysql_real_escape_string($param);
+	$data = mysql_real_escape_string($data);
+	$wpdb->query("INSERT INTO " . $relevanssi_variables['relevanssi_cache'] . " (param, hits)
+		VALUES ('$param', '$data')
+		ON DUPLICATE KEY UPDATE hits = '$data'");
+}
+
+function relevanssi_truncate_cache($all = false) {
+	global $wpdb, $relevanssi_variables;
+	$relevanssi_excerpt_cache = $relevanssi_variables['relevanssi_excerpt_cache'];
+	$relevanssi_cache = $relevanssi_variables['relevanssi_cache'];
+
+	if ($all) {
+		$query = "TRUNCATE TABLE $relevanssi_excerpt_cache";
+		$wpdb->query($query);
+
+		$query = "TRUNCATE TABLE $relevanssi_cache";
+	}
+	else {
+		$time = get_option('relevanssi_cache_seconds', 172800);
+		$query = "DELETE FROM $relevanssi_cache
+			WHERE UNIX_TIMESTAMP() - UNIX_TIMESTAMP(tstamp) > $time";
+		// purge all expired cache data
+	}
+	$wpdb->query($query);
+}
+
+
+?>