Now all modules are in core modules folder

modules/custom_search/includes/apachesolr_search.inc

@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * @file
+ * Path generation for Apache Solr Search.
+ *
+ * Available vars:
+ * $orginal_keywords: user input
+ * $types: content types (machine names[])
+ * $terms: taxonomy terms (tids[])
+ * $keys: complete search phrase, as core would have done it
+ *
+ * To return:
+ * the complete search path
+ *
+ */
+
+function _custom_search_apachesolr_search($variables) {
+  $type = 'search/apachesolr_search/' . $variables['keywords'];
+  $keys = array();
+
+  if (count($variables['types']) && !in_array('all', $variables['types'])) $keys[] = 'type:' . implode('%20type:', $variables['types']);
+
+  if (module_exists('taxonomy') && count($variables['terms'])) $keys[] = 'tid:' . implode('%20tid:', $variables['terms']);
+
+  $keys = 'filters=' . implode('%20', $keys);
+
+  return array('path' => $type, 'query' => $keys);
+}