ding_item_viewer.install

<?php
/**
 * @file
 */

/**
 * Implements hook_uninstall().
 */
function ding_item_viewer_uninstall() {
  // Remove settings.
  variable_del('ding_item_viewer_item_limit');
  variable_del('ding_item_viewer_search_queries');
  variable_del('ding_item_viewer_cache_ttl');
}

/**
 * Implements hook_install().
 */
function ding_item_viewer_install() {
  ding_item_viewer_update_7001();
}

/**
 * Add 'More info' field.
 */
function ding_item_viewer_update_7001() {
  field_cache_clear();
  ding_item_viewer_create_field();
  _ding_item_viewer_enable_modules();
}

function ding_item_viewer_create_field() {
  $field_name = 'more_info';

  $field = field_info_field($field_name);
  if ($field) {
    $instance = field_info_instance('ting_object', $field_name, 'ting_object');
    field_purge_instance($instance);
    field_purge_field($field);
  }

  $field = array(
    'field_name' => $field_name,
    'type' => 'ting_object_more_info',
    'locked' => FALSE,
    'default_widget' => 'hidden',
    'no_ui' => TRUE,
    'entity_types' => array('ting_object'),
    'storage' => array(
      'type' => 'virtual_field',
    ),
  );
  field_create_field($field);

  $instance = array(
    'field_name' => $field_name,
    'label' => 'More info',
    'bundle' => 'ting_object',
    'entity_type' => 'ting_object',
    'widget' => array(
      'type' => 'hidden',
    ),
    'formatter' => array(
      'type' => 'ting_object_more_info_default',
    ),
    'display' => array(
      'ding_item_viewer_big' => array(
        'label' => 'hidden',
      ),
    ),
  );

  field_create_instance($instance);
}

/**
 * Enable required modules.
 */
function _ding_item_viewer_enable_modules() {
  if (!module_exists('ding_entity_buttons_settings')) {
    module_enable(array('ding_entity_buttons_settings'), TRUE);
  }
}

/**
 * Fix fields.
 */
function ding_item_viewer_update_7002() {
  features_revert(array('ding_item_viewer' => 'field'));
}