<?php
// $Id: biblio_field_indexer.module,v 1.1 2008-06-22 16:30:33 davidlesieur Exp $

/**
 * @file
 * Exposes Biblio fields for indexing into the search index.
 */

/**
 * Implementation of hook_field_indexer_list().
 *
 * Retrieve all fields provided by Biblio (common fields and type-specific
 * fields).
 *
 * @return
 *   An array describing the fields, each field being represented by an array
 *   with the following attributes:
 *   - name: Machine name or id of the field.
 *   - extra_name: Extra field name or id information.
 *   - label: Printable name of the field.
 *   - help: Optional info that may help in identifying the field.
 */
function biblio_field_indexer_field_indexer_list() {
  $fields = array();  
  // Note: The Biblio module has a visible attribute at the field level, but
  // doesn't seem to use it at the moment. If that changes, we might have to add
  // a condition for field visibility.
  $results = db_query("SELECT f.fid AS name, 0 AS extra_name, f.title AS label, 'common' AS help FROM {biblio_fields} f WHERE f.common = 1 UNION SELECT d.fid AS name, d.tid AS extra_name, d.title AS label, t.name AS help FROM {biblio_type_details} d INNER JOIN {biblio_types} t ON t.tid = d.tid INNER JOIN {biblio_fields} f ON f.fid = d.fid WHERE t.visible = 1");
  while ($field = db_fetch_array($results)) {
    $field['namespace'] = 'biblio';
    $fields[] = $field;
  }
  return $fields;
}

/**
 * Implementation of hook_nodeapi().
 *
 * This is used to add our own entries to the search index. Using nodeapi's
 * update index operation is convenient, since the node module already handles
 * the logic for determining which nodes need indexing.
 */
function biblio_field_indexer_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
  static $fields = NULL;
  if ($op == 'update index' && $node->type == 'biblio') {
    // Retrieve the enabled fields.
    if (!isset($fields)) {
      $fields = array();
      $results = db_query("SELECT f.fiid, b.fid, f.extra_name AS tid, b.name AS node_field_name, b.type FROM {field_indexer_map} f INNER JOIN {biblio_fields} b ON f.name = b.fid WHERE f.namespace = 'biblio' AND f.status = 1");
      while ($field = db_fetch_array($results)) {
        $fields[] = $field;
      }
    }

    // Index the field content.
    foreach ($fields as $field) {
      if (isset($node->{$field['node_field_name']}) && trim($node->{$field['node_field_name']}) != '') {
        // Filter field content.
        if ($field['type'] == 'textarea') {
          // TODO: Filter more intelligently; we might want to take into account other tags than those allowed by FILTER_HTML_STRIP.
          $text = check_markup($node->{$field['node_field_name']}, FILTER_HTML_STRIP, FALSE);
        }
        else {
          $text = check_plain($node->{$field['node_field_name']});
        }
        // Index field content.
        field_indexer_index($node->nid, $field['fiid'], $text);
      }
    }
  }
}