<?php
  /**
   * Copyright (c) 2013 Georg Ehrke georg@ownCloud.com
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  //both, libreoffice backend and php fallback, need imagick
  if (extension_loaded('imagick')) {

  	$isShellExecEnabled = \OC_Helper::is_function_enabled('shell_exec');

  
  	// LibreOffice preview is currently not supported on Windows
  	if (!\OC_Util::runningOnWindows()) {
  		$whichLibreOffice = ($isShellExecEnabled ? shell_exec('which libreoffice') : '');
  		$isLibreOfficeAvailable = !empty($whichLibreOffice);
  		$whichOpenOffice = ($isShellExecEnabled ? shell_exec('which libreoffice') : '');
  		$isOpenOfficeAvailable = !empty($whichOpenOffice);
  		//let's see if there is libreoffice or openoffice on this machine
  		if($isShellExecEnabled && ($isLibreOfficeAvailable || $isOpenOfficeAvailable || is_string(\OC_Config::getValue('preview_libreoffice_path', null)))) {
  			require_once('office-cl.php');

  		}

  	}
  }