From 2cdde905f5f8692ba4bcad2bd66642663f1572b3 Mon Sep 17 00:00:00 2001
From: Silvio <silvio@socioambiental.org>
Date: Mon, 28 Sep 2009 12:24:00 -0300
Subject: Initial import

---
 .gitignore                  |   2 +
 COPYING                     |   1 +
 README                      |  11 ++++
 node_import_truncate.info   |   6 ++
 node_import_truncate.module | 130 ++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 150 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 COPYING
 create mode 100644 README
 create mode 100644 node_import_truncate.info
 create mode 100644 node_import_truncate.module

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d54e6df
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+# Ignore any vim temp file
+*.swp
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..3ca27fc
--- /dev/null
+++ b/COPYING
@@ -0,0 +1 @@
+TODO: Choose License.
diff --git a/README b/README
new file mode 100644
index 0000000..a256566
--- /dev/null
+++ b/README
@@ -0,0 +1,11 @@
+Node Import Truncate
+====================
+
+This module adds a final step at the Node Import form so users
+can choose whether to erase all nodes of a given content type
+before importing new data into it.
+
+It might be useful in cases like users periodically importing
+a CSV spreadsheet with new as well old content: this module can
+erase all previous imported data to avoid duplicate content in
+the database.
diff --git a/node_import_truncate.info b/node_import_truncate.info
new file mode 100644
index 0000000..c7628a0
--- /dev/null
+++ b/node_import_truncate.info
@@ -0,0 +1,6 @@
+; $Id$
+name = Node Import Truncate
+description = Allow to truncate a content type before importing data.
+package = Development
+core = 6.x
+dependencies[] = node_import
diff --git a/node_import_truncate.module b/node_import_truncate.module
new file mode 100644
index 0000000..7d5abf9
--- /dev/null
+++ b/node_import_truncate.module
@@ -0,0 +1,130 @@
+<?
+// $Id$
+
+/**
+ * Implementation of hook_menu();
+ */
+function node_import_truncate_menu() {
+  $items['admin/content/node_import/truncate'] = array(
+    'title'            => 'Despesas - Mass deletion',
+    'description'      => 'Mass deletion page.',
+    'page callback'    => 'node_import_truncate_page',
+    'access arguments' => array('administer nodes'),
+    'type'             => MENU_CALLBACK,
+  );
+  return $items;
+}
+
+/**
+ * Menu callback.
+ */
+function node_import_truncate_page($taskid = null) {
+  $output  = t('Choose whether to delete older content.');
+  $output .= drupal_get_form('node_import_truncate_form', $taskid);
+  return $output;
+}
+
+/**
+ * Mass deletion form.
+ */
+function node_import_truncate_form(&$form_state, $taskid = null) {
+  $form['taskid'] = array(
+    '#type'  => 'value',
+    '#value' => $taskid,
+  );
+  $form['mass_delete'] = array(
+    '#type'        => 'checkbox',
+    '#title'       => t('Pre-import mass deletion'),
+    '#description' => t('Delete old content before importing new data.'),
+  );
+  $form['submit'] = array(
+    '#type'  => 'submit',
+    '#value' => t('Submit'),
+  );
+  return $form;
+}
+
+/**
+ * Handle post-validation form-submission.
+ */
+function node_import_truncate_form_submit($form, &$form_state) {
+  $mass_delete = $form_state['values']['mass_delete'];
+
+  if (isset($form_state['values']['taskid']['#value'])) {
+    $taskid   = $form_state['values']['taskid']['#value'];
+    $redirect = 'admin/content/node_import/' . $taskid;
+  } else {
+    $redirect = null;
+  }
+    
+  if ($mass_delete == 1) {
+
+    $task  = node_import_load($taskid);
+    $type  = ereg_replace('.*:', '', $task['type']);
+    $batch = array(
+        'title'      => t('Deleting old data.'),
+        'operations' => array(
+          array('node_import_truncate', array($type)),
+          ),
+        'finished'   => 'node_import_truncate_callback',
+        );
+
+    batch_set($batch);
+    batch_process($redirect);
+  } else {
+    drupal_goto($redirect);
+  }
+}
+
+/**
+ * Implementation of hook_node_import_task();
+ *
+ * As the user is probably adding a spreadsheet containing
+ * old and new content, we need to make sure to remove all
+ * previous content to prevent duplicate data in the
+ * database.
+ */
+function node_import_truncate_node_import_task($task, $op) {
+  if ($op == 'insert') {
+    drupal_goto('admin/content/node_import/truncate/' . $task['taskid']);
+  }
+}
+
+/**
+ * Mass deletion of content.
+ */
+function node_import_truncate($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'] / $context['sandbox']['max'];
+  }
+}
+
+/**
+ * Callback for node_import_truncate();
+ */
+function node_import_truncate_callback($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);
+}
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