materio-base-d7/sites/all/modules/contrib/mail/mailgun/mailgun.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Mailgun module.
 */

/**
 * Implements hook_uninstall().
 */
function mailgun_uninstall() {
  // Delete variables.
  $variables = array(
    'mailgun_api_key',
    'mailgun_from_action',
    'mailgun_from_name',
    'mailgun_from_mail',
    'mailgun_tracking',
    'mailgun_tracking_clicks',
    'mailgun_tracking_opens',
    'mailgun_queue',
    'mailgun_log',
    'mailgun_format',
    'mailgun_tagging_mailkey',
  );
  foreach ($variables as $variable) {
    variable_del($variable);
  }
}

/**
 * Implements hook_enable().
 */
function mailgun_enable() {
  mailsystem_set(array('mailgun_test' => 'MailgunMailSystem'));
}

/**
 * Implements hook_disable().
 */
function mailgun_disable() {
  // Tell Mail System to remove Mailgun and restore to defaults.
  mailsystem_clear(array('mailgun_test' => 'MailgunMailSystem'));
  watchdog('mailgun', 'Mailgun has been disabled.');
}

/**
 * Implements hook_requirements().
 */
function mailgun_requirements($phase) {
  // Ensure translations don't break during installation.
  $t = get_t();

  $requirements = array();

  if ($phase === 'runtime') {
    $requirements['mailgun']['title'] = $t('Mailgun');

    if (mailgun_check_library()) {
      $requirements['mailgun']['value'] = $t('The Mailgun library is installed correctly.');
      $requirements['mailgun']['severity'] = REQUIREMENT_OK;
    }
    else {
      $requirements['mailgun']['value'] = $t('The Mailgun library has not been installed correctly.');
      $requirements['mailgun']['severity'] = REQUIREMENT_ERROR;
    }
  }

  return $requirements;
}