### Eclipse Workspace Patch 1.0
#P prev_next
Index: prev_next.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/prev_next/prev_next.module,v
retrieving revision 1.1
diff -u -r1.1 prev_next.module
--- prev_next.module	7 May 2009 22:12:04 -0000	1.1
+++ prev_next.module	25 Oct 2009 14:39:35 -0000
@@ -2,6 +2,7 @@
 // $Id: prev_next.module,v 1.1 2009/05/07 22:12:04 kbahey Exp $
 
 define('PREV_NEXT_BATCH_SIZE_DEFAULT', 200);
+define('PREV_NEXT_INDEXING_CRITERIA_DEFAULT', 'nid');
 define('PREV_NEXT_NODE_TYPE',          'prev_next_node_type_');
 
 /**
@@ -71,6 +72,24 @@
     '#required'      => TRUE,
   );
 
+  $form['indexing_criteria'] = array(
+    '#title'          => t('Indexing criteria'),
+    '#type'           => 'select',
+    '#options'        => array(
+      'nid'     => t('Node ID'),
+      'created' => t('Post date'),
+      'changed' => t('Updated date'),
+      'title'   => t('Title')
+    ),
+    '#default_value'  => variable_get('indexing_criteria',PREV_NEXT_INDEXING_CRITERIA_DEFAULT),
+    '#description'    => t('Note: changing this value will reset the entire Prev/Next index.')
+  );
+	
+  $form['current_indexing_criteria'] = array(
+    '#type'   => 'hidden',
+    '#value'  => variable_get('indexing_criteria',PREV_NEXT_INDEXING_CRITERIA_DEFAULT)
+  );
+
   $form['node_types'] = array(
     '#type'        => 'fieldset',
     '#title'       => t('Content types'),
@@ -85,6 +104,8 @@
     );
   }
 
+  $form['#submit'][] = 'prev_next_admin_submit';
+
   return system_settings_form($form);
 }
 
@@ -105,6 +126,18 @@
   }
 }
 
+/**
+ * Submit callback.
+ */
+function prev_next_admin_submit($form, &$form_state) {
+	// If the search criteria has been changed, re-index.
+  if ($form_state['values']['current_indexing_criteria'] != $form_state['values']['indexing_criteria']) {
+    prev_next_reindex();
+    drupal_set_message(t('The Prev/Next index will be rebuilt.'));
+  }
+  $form_state['redirect'] = 'admin/settings/prev_next';
+}
+
 function prev_next_reindex_confirm() {
   return confirm_form(array(), t('Are you sure you want to re-index Prev/Next?'),
     'admin/settings/prev_next', t(' The entire Prev/Next index will be reset and rebuilt incrementally as cron runs. action cannot be undone.'), t('Re-index'), t('Cancel'));
@@ -175,10 +208,12 @@
  */
 function _prev_next_add($nid) {
   $cond =  _prev_next_node_types_sql();
+  $search_criteria = variable_get('indexing_criteria', PREV_NEXT_INDEXING_CRITERIA_DEFAULT);
 
-  $next_nid = db_result(db_query("SELECT nid FROM {node} WHERE nid > %d AND status = 1 $cond ORDER BY nid ASC  LIMIT 1", $nid));
+  $criteria_value = db_result(db_query("SELECT %s FROM {node} WHERE nid = %d LIMIT 1", $search_criteria, $nid));
+  $next_nid = db_result(db_query("SELECT nid FROM {node} WHERE %s > %s AND status = 1 $cond ORDER BY %s ASC  LIMIT 1", $search_criteria, $criteria_value, $search_criteria));
 
-  $prev_nid = db_result(db_query("SELECT nid FROM {node} WHERE nid < %d AND status = 1 $cond ORDER BY nid DESC LIMIT 1", $nid));
+  $prev_nid = db_result(db_query("SELECT nid FROM {node} WHERE %s < %s AND status = 1 $cond ORDER BY %s DESC LIMIT 1", $search_criteria, $criteria_value, $search_criteria));
 
   // Update the node-level data
   $exists = db_result(db_query('SELECT COUNT(*) FROM {prev_next_node} WHERE nid = %d', $nid));