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<?php
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// $Id$
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function nodeupdate_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
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$types = variable_get('nodeupdate_types', NULL);
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if (isset($types) && !$types[$node->type]) return;
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switch ($op) {
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case 'view':
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if ($a3 == TRUE) break; // teaser?
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_nodeupdate_inject($node->nid);
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break;
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case 'insert':
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case 'update':
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cache_set('nodeupdate:'. $node->nid, array('changed' => $node->changed), 'cache');
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break;
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case 'delete':
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cache_clear_all('nodeupdate:'. $node->nid, 'cache');
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break;
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}
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}
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function nodeupdate_form_alter(&$form, $form_state, $form_id) {
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if (!isset($form['type']) || !isset($form['nid']['#value'])) return;
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$types = variable_get('nodeupdate_types', NULL);
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if (isset($types) && !$types[$form['type']['#value']]) return;
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_nodeupdate_inject(intval($form['nid']['#value']));
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}
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function nodeupdate_menu() {
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$items['nodeupdate'] = array(
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'title' => 'Node update',
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'description' => 'Check if the node has been updated since a given time.',
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'page callback' => '_nodeupdate_check',
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'type' => MENU_CALLBACK,
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'access arguments' => array('access content'),
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);
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$items['admin/settings/nodeupdate'] = array(
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'title' => 'Node update settings',
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'description' => 'Administer settings for the node update notification.',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('_nodeupdate_settings'),
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'access arguments' => array('administer site settings'),
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);
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return $items;
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}
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function _nodeupdate_inject($nid) {
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drupal_add_js(drupal_get_path('module', 'nodeupdate').'/nodeupdate.js');
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drupal_add_js(array('nodeupdate' => array(
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'nid' => $nid,
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'time' => time(),
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'messageUpdated' => t('This node has been updated. Would you like to reload it?'),
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'messageDeleted' => t('This node has been deleted. We will navigate away from it.'),
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'interval' => variable_get('nodeupdate_interval', 5000),
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)),
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'setting'
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);
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}
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function _nodeupdate_last_changed($nid) {
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if (($cache = cache_get('nodeupdate:'. $nid, 'cache')) && !empty($cache->data)) {
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$changed = $cache->data['changed'];
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}
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else {
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$changed = node_last_changed($nid);
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if ($changed) { // NULL if deleted
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cache_set('nodeupdate:'. $nid, array('changed' => $changed), 'cache');
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}
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}
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return $changed;
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}
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function _nodeupdate_check($nid, $time) {
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$changed = _nodeupdate_last_changed($nid);
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drupal_json(array('changed' => (!$changed ? -1 : ($changed > $time ? $changed : 0))));
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}
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function _nodeupdate_settings() {
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$form['nodeupdate_interval'] = array(
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'#type' => 'textfield',
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'#title' => t('Refresh interval'),
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'#default_value' => variable_get('nodeupdate_interval', 5000),
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'#field_suffix' => t('milliseconds'),
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'#description' => t('The time interval before the module checks again if the node has been updated.'),
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);
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$form['nodeupdate_types'] = array(
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'#title' => t('Content types'),
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'#type' => 'checkboxes',
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'#options' => node_get_types('names'),
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'#default_value' => variable_get('nodeupdate_types', NULL),
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'#description' => t('Content types that the module will intercept to check for node updates.'),
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);
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return system_settings_form($form);
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}
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