ding_frontend.module

<?php
/**
 * @file
 * Code for the ding frontend feature.
 */

include_once 'ding_frontend.features.inc';

/**
 * Implements hook_theme().
 *
 * Field formatter theme function mainly used in event views to create the nice
 * calendar header in event lists.
 */
function ding_frontend_theme() {
  return array(
    'calendar_header' => array(
      'variables' => array(
        'date' => array(
          'day' => NULL,
          'month' => NULL,
          'weekday' => NULL,
          'year' => NULL,
        ),
        'timestamp' => NULL,
        'timezone' => NULL,
        'today' => FALSE,
      ),
      'template' => 'templates/calendar-header',
    ),
  );
}

/**
 * Implements hook_ctools_plugin_directory().
 *
 * It simply tells panels where to find the .inc files that define various
 * args, contexts, content_types. In this case the subdirectories of
 * ctools_plugin_example/panels are used.
 */
function ding_frontend_ctools_plugin_directory($owner, $plugin_type) {
  return 'plugins/' . $plugin_type;
}

/**
 * Implements hook_field_formatter_info().
 */
function ding_frontend_field_formatter_info() {
  return array(
    'calendar_header' => array(
      'label' => t('Calendar header'),
      'field types' => array(
        'datetime',
      ),
    ),
  );
}

/**
 * Implements hook_field_formatter_view().
 */
function ding_frontend_field_formatter_view($entity_type, $entity, $field, $instances, $langcode, $items, $display) {
  $element = array();

  // Get current timezone from configuration.
  $timezone = date_default_timezone_get();

  foreach ($items as $delta => $item) {
    if ($display['type'] == 'calendar_header') {
      // Create timestamp base on current timezone.
      $date = new DateObject(
        $item['value'],
        $item['timezone_db'],
        date_type_format($item['date_type'])
      );
      $timestamp = $date->format(DATE_FORMAT_UNIX);

      // Added render array to output element.
      $element[$delta] = array(
        '#theme' => 'calendar_header',
        '#date' => array(
          'day' => format_date($timestamp, 'custom', 'j', $timezone),
          'month' => format_date($timestamp, 'custom', 'F', $timezone),
          'weekday' => format_date($timestamp, 'custom', 'l', $timezone),
          'year' => format_date($timestamp, 'custom', 'Y', $timezone),
        ),
        '#timestamp' => $timestamp,
        '#timezone' => $timezone,
        '#today' => date('j.F.l') == date('j.F.l', $timestamp) ? TRUE : FALSE,
      );
    }
  }

  return $element;
}

/**
 * Implements hook_query_alter().
 *
 * Remove duplicates from the node search result view by grouping by nid and
 * removing the score field.
 */
function ding_frontend_query_alter($query) {
  if (isset($query->alterMetaData)) {
    if (isset($query->alterMetaData['view'])) {
      if ($query->alterMetaData['view']->name == 'ding_node_search') {
        $fields = &$query->getGroupBy();
        // Remove the score field and add group by nid.
        unset($fields['score']);
        $query->groupBy('nid');
      }
    }
  }
}

/**
 * Implements hook_change_maintenance_mode().
 *
 * @param Boolean $maintenance_mode
 * TRUE if the site is being set into maintenance mode.
 * FALSE if maintenance mode is being deactivated.
 *
 * Clear page cache if maintainance status has changed.
 */
function ding_frontend_change_maintenance_mode($maintenance_mode) {
  cache_clear_all();
}