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Filename : Version.php
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<?php
/**
 * PHPUnit_SkeletonGenerator
 *
 * Copyright (c) 2012, Sebastian Bergmann <sebastian@phpunit.de>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Sebastian Bergmann nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package   phpcpd
 * @author    Sebastian Bergmann <sebastian@phpunit.de>
 * @copyright 2012 Sebastian Bergmann <sebastian@phpunit.de>
 * @license   http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 * @since     File available since Release 1.2.0
 */

namespace SebastianBergmann\PHPUnit\SkeletonGenerator
{
    /**
     * @author    Sebastian Bergmann <sebastian@phpunit.de>
     * @copyright 2009-2013 Sebastian Bergmann <sebastian@phpunit.de>
     * @license   http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
     * @link      http://www.phpunit.de/
     * @since     Class available since Release 1.2.0
     */
    class Version
    {
        const VERSION = '1.2.1';
        protected static $version;

        /**
         * @return string
         */
        public static function id()
        {
            if (self::$version === NULL) {
                self::$version = self::VERSION;

                if (is_dir(dirname(__DIR__) . '/.git')) {
                    $dir = getcwd();
                    chdir(__DIR__);
                    $version = exec('git describe --tags');
                    chdir($dir);

                    if ($version) {
                        if (count(explode('.', self::VERSION)) == 3) {
                            self::$version = $version;
                        } else {
                            $version = explode('-', $version);

                            self::$version = self::VERSION . '-' . $version[2];
                        }
                    }
                }
            }

            return self::$version;
        }
    }
}