1 files changed, 127 insertions, 0 deletions
diff --git a/node_truncate.module b/node_truncate.module
new file mode 100644
index 0000000..b5fe7e4
--- /dev/null
+++ b/node_truncate.module
@@ -0,0 +1,127 @@
+<?php
+// $Id$
+
+/**
+ * @file
+ * Node Truncate module.
+ *
+ * Use this module to delete all posts from a given content type.
+ */
+
+/**
+ * Implementation of hook_menu();
+ */
+function node_truncate_menu() {
+  $items['admin/content/node_truncate'] = array(
+    'title'            => 'Node Truncate',
+    'description'      => 'Mass deletion page.',
+    'page callback'    => 'node_truncate_page',
+    'access arguments' => array('administer nodes'),
+    'type'             => MENU_NORMAL_ITEM,
+  );
+  return $items;
+}
+
+/**
+ * Menu callback.
+ */
+function node_truncate_page() {
+  $output  = t('Choose a content type to truncate.');
+  $output .= drupal_get_form('node_truncate_form');
+  return $output;
+}
+
+/**
+ * Mass deletion form.
+ */
+function node_truncate_form(&$form_state) {
+  $node_types = node_get_types();
+  $node_codes = array();
+
+  foreach ($node_types as $item) {
+    $node_codes[$item->type] = $item->name;
+  }
+
+  $form['node_types'] = array(
+    '#type'          => 'checkboxes',
+    '#title'         => t('Node types'),
+    '#options'       => $node_codes,
+    '#default_value' => variable_get('node_truncate_nodetypes', array()),
+    '#description'   => t('Select nodetypes which should be truncated.'),
+  );
+
+  $form['submit'] = array(
+    '#type'  => 'submit',
+    '#value' => t('Submit'),
+  );
+
+  return $form;  
+}
+
+/**
+ * Implementation of hook_validate();
+ */
+function node_truncate_form_validate($form, $form_state) {
+  if (!isset($form_state['values']['node_types'])) {
+    form_set_error('mass_delete', t('Please choose at least one node type.'));
+  }
+}
+
+/**
+ * Handle post-validation form-submission.
+ */
+function node_truncate_form_submit($form, &$form_state) {
+  $operations = array();
+
+  foreach(array_filter($form_state['values']['node_types']) as $type) {
+    $operations[] = array('node_truncate', array($type));
+  }
+
+  $batch = array(
+    'title'      => t('Deleting old data.'),
+    'operations' => $operations,
+    'finished'   => 'node_truncate_callback',
+  );
+
+  batch_set($batch);
+  batch_process($redirect);
+}
+
+/**
+ * Mass deletion of content.
+ */
+function node_truncate($type, &$context) {
+  $type = 'WHERE type = "' . $type . '"';
+  if (empty($context['sandbox'])) {
+    $context['sandbox']['progress']     = 0;
+    $context['sandbox']['current_node'] = 0;
+    $context['sandbox']['max']          = db_result(db_query('SELECT COUNT(DISTINCT nid) FROM {node} ' . $type));
+  }
+  $limit = 5;
+  $result = db_query_range('SELECT nid FROM {node} ' . $type, $context['sandbox']['current_node'], 0, $limit);
+  while ($row = db_fetch_array($result)) {
+    $node = node_delete($row['nid'], NULL, TRUE);
+    $context['sandbox']['progress']++;
+    $context['sandbox']['current_node'] = $node->nid;
+    $context['results'][]               = $node->nid .' : '. $node->title;
+    $context['message']                 = $node->title;
+  }
+  if ($context['sandbox']['progress'] != $context['sandbox']['max']) {
+    $context['finished'] = $context['sandbox']['progress'] / $context['sandbox']['max'];
+  }
+}
+
+/**
+ * Callback for node_truncate();
+ */
+function node_truncate_callback($success, $results, $operations) {
+  if ($success) {
+    if ($results > 0) {
+      $message = format_plural(count($results), t('One old post processed.'), t('@count old posts processed.'));
+    }
+  }
+  else {
+    $message = t('Finished with an error.');
+  }
+  drupal_set_message($message);
+}