field_slideshow.install

<?php

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

use Drupal\Core\Url;

/**
 * Implements hook_schema().
 */
function field_slideshow_requirements($phase) {
  $requirements = array();

  if ($phase == 'runtime') {
    $path = '';
    if ($path == '') {
      $path = DRUPAL_ROOT . '/libraries/jquery.cycle';
    }
    if (file_exists($path . '/jquery.cycle.all.min.js') || file_exists($path . '/jquery.cycle.all.js')) {
      $requirements['field_slideshow_cycle_plugin'] = array(
        'title'     => t('JQuery Cycle plugin'),
        'severity'  => REQUIREMENT_OK,
        'value'     => t('Installed'),
      );
    }
    else {
      $url = Url::fromUri('http://jquery.malsup.com/cycle/download.html');
      $requirements['field_slideshow_cycle_plugin'] = array(
        'title'       => t('JQuery Cycle plugin'),
        'value'       => t('Not found'),
        'severity'    => REQUIREMENT_ERROR,
        'description' => t('You need to download the %name and move the downloaded js file(s) into the %path folder of your server.', array('%name' => \Drupal::l(t('JQuery Cycle plugin'), $url), '%path' => $path)),
      );
    }
  }

  // @todo Carousel code to be fixed
  $carousel_used = FALSE;
  if ($carousel_used) {
    $path = '';
    if ($path == '') {
      $path = DRUPAL_ROOT . '/libraries/jquery.jcarousel';
    }
    if (file_exists($path . '/lib/jquery.jcarousel.min.js') || file_exists($path . '/lib/jquery.jcarousel.js')) {
      $requirements['field_slideshow_jcarousel_plugin'] = array(
        'title'     => t('JCarousel plugin'),
        'severity'  => REQUIREMENT_OK,
        'value'     => t('Installed'),
      );
    }
    else {
      $url = Url::fromUri('http://sorgalla.com/jcarousel/');
      $requirements['field_slideshow_jcarousel_plugin'] = array(
        'title'       => t('JCarousel plugin'),
        'value'       => t('Not found'),
        'severity'    => REQUIREMENT_ERROR,
        'description' => t('You need to download the %name and move the content of the downloaded folder into the %path folder of your server. When this is done there should be a file sites/all/libraries/jquery.jcarousel/lib/jquery.jcarousel.js, or jquery.jcarousel.min.js', array('%name' => \Drupal::l(t('JCarousel plugin'), $url), '%path' => $path)),
      );
    }
  }
  $path = '';
  if ($path == '') {
    $path = DRUPAL_ROOT . '/libraries/jquery.imagesloaded';
  }
  if (file_exists($path . '/jquery.imagesloaded.min.js') || file_exists($path . '/jquery.imagesloaded.js')) {
    $requirements['field_slideshow_imagesloaded_plugin'] = array(
      'title'     => t('JQuery ImagesLoaded plugin'),
      'severity'  => REQUIREMENT_OK,
      'value'     => t('Installed'),
    );
  }
  else {
    $url = Url::fromUri('https://github.com/desandro/imagesloaded/downloads');
    $requirements['field_slideshow_imagesloaded_plugin'] = array(
      'title'       => t('JQuery ImagesLoaded plugin'),
      'value'       => t('Not found'),
      'severity'    => REQUIREMENT_WARNING,
      'description' => t('For best results, you should download the %name and move the downloaded js file(s) into the %path folder of your server.', array('%name' => \Drupal::l(t('JQuery ImagesLoaded plugin'), $url), '%path' => $path)),
    );
  }

  return $requirements;
}