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/*
 * This file is part of the symfony package.
 * (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * sfFilesystem provides basic utility to manipulate the file system.
 *
 * @package    symfony
 * @subpackage util
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 * @version    SVN: $Id: sfFilesystem.class.php 31247 2010-10-26 12:26:15Z fabien $
 */
class sfFilesystem
{
  protected
    $dispatcher = null,
    $formatter  = null;

  /**
   * Constructor.
   *
   * @param sfEventDispatcher $dispatcher  An sfEventDispatcher instance
   * @param sfFormatter       $formatter   An sfFormatter instance
   */
  public function __construct(sfEventDispatcher $dispatcher = null, sfFormatter $formatter = null)
  {
    $this->dispatcher = $dispatcher;
    $this->formatter = $formatter;
  }

  /**
   * Copies a file.
   *
   * This method only copies the file if the origin file is newer than the target file.
   *
   * By default, if the target already exists, it is not overriden.
   *
   * To override existing files, pass the "override" option.
   *
   * @param string $originFile  The original filename
   * @param string $targetFile  The target filename
   * @param array  $options     An array of options
   */
  public function copy($originFile, $targetFile, $options = array())
  {
    if (!array_key_exists('override', $options))
    {
      $options['override'] = false;
    }

    // we create target_dir if needed
    if (!is_dir(dirname($targetFile)))
    {
      $this->mkdirs(dirname($targetFile));
    }

    $mostRecent = false;
    if (file_exists($targetFile))
    {
      $statTarget = stat($targetFile);
      $stat_origin = stat($originFile);
      $mostRecent = ($stat_origin['mtime'] > $statTarget['mtime']) ? true : false;
    }

    if ($options['override'] || !file_exists($targetFile) || $mostRecent)
    {
      $this->logSection('file+', $targetFile);
      copy($originFile, $targetFile);
    }
  }

  /**
   * Creates a directory recursively.
   *
   * @param  string $path  The directory path
   * @param  int    $mode  The directory mode
   *
   * @return bool true if the directory has been created, false otherwise
   */
  public function mkdirs($path, $mode = 0777)
  {
    if (is_dir($path))
    {
      return true;
    }

    $this->logSection('dir+', $path);

    return @mkdir($path, $mode, true);
  }

  /**
   * Creates empty files.
   *
   * @param mixed $files  The filename, or an array of filenames
   */
  public function touch($files)
  {
    if (!is_array($files))
    {
      $files = array($files);
    }

    foreach ($files as $file)
    {
      $this->logSection('file+', $file);

      touch($file);
    }
  }

  /**
   * Removes files or directories.
   *
   * @param mixed $files  A filename or an array of files to remove
   */
  public function remove($files)
  {
    if (!is_array($files))
    {
      $files = array($files);
    }

    $files = array_reverse($files);
    foreach ($files as $file)
    {
      if (is_dir($file) && !is_link($file))
      {
        $this->logSection('dir-', $file);

        rmdir($file);
      }
      else
      {
        $this->logSection(is_link($file) ? 'link-' : 'file-', $file);

        unlink($file);
      }
    }
  }

  /**
   * Change mode for an array of files or directories.
   *
   * @param array   $files  An array of files or directories
   * @param integer $mode   The new mode
   * @param integer $umask  The mode mask (octal)
   */
  public function chmod($files, $mode, $umask = 0000)
  {
    $currentUmask = umask();
    umask($umask);

    if (!is_array($files))
    {
      $files = array($files);
    }

    foreach ($files as $file)
    {
      $this->logSection(sprintf('chmod %o', $mode), $file);
      chmod($file, $mode);
    }

    umask($currentUmask);
  }

  /**
   * Renames a file.
   *
   * @param string $origin  The origin filename
   * @param string $target  The new filename
   */
  public function rename($origin, $target)
  {
    // we check that target does not exist
    if (is_readable($target))
    {
      throw new sfException(sprintf('Cannot rename because the target "%s" already exist.', $target));
    }

    $this->logSection('rename', $origin.' > '.$target);
    rename($origin, $target);
  }

  /**
   * Creates a symbolic link or copy a directory.
   *
   * @param string $originDir      The origin directory path
   * @param string $targetDir      The symbolic link name
   * @param bool   $copyOnWindows  Whether to copy files if on windows
   */
  public function symlink($originDir, $targetDir, $copyOnWindows = false)
  {
    if ('\\' == DIRECTORY_SEPARATOR && $copyOnWindows)
    {
      $finder = sfFinder::type('any');
      $this->mirror($originDir, $targetDir, $finder);
      return;
    }

    $ok = false;
    if (is_link($targetDir))
    {
      if (readlink($targetDir) != $originDir)
      {
        unlink($targetDir);
      }
      else
      {
        $ok = true;
      }
    }

    if (!$ok)
    {
      $this->logSection('link+', $targetDir);
      symlink($originDir, $targetDir);
    }
  }

  /**
   * Creates a symbolic link using a relative path if possible.
   *
   * @param string $originDir      The origin directory path
   * @param string $targetDir      The symbolic link name
   * @param bool   $copyOnWindows  Whether to copy files if on windows
   */
  public function relativeSymlink($originDir, $targetDir, $copyOnWindows = false)
  {
    if ('\\' != DIRECTORY_SEPARATOR || !$copyOnWindows)
    {
      $originDir = $this->calculateRelativeDir($targetDir, $originDir);
    }

    $this->symlink($originDir, $targetDir, $copyOnWindows);
  }

  /**
   * Mirrors a directory to another.
   *
   * @param string   $originDir  The origin directory
   * @param string   $targetDir  The target directory
   * @param sfFinder $finder     An sfFinder instance
   * @param array    $options    An array of options (see copy())
   */
  public function mirror($originDir, $targetDir, $finder, $options = array())
  {
    foreach ($finder->relative()->in($originDir) as $file)
    {
      if (is_dir($originDir.DIRECTORY_SEPARATOR.$file))
      {
        $this->mkdirs($targetDir.DIRECTORY_SEPARATOR.$file);
      }
      else if (is_file($originDir.DIRECTORY_SEPARATOR.$file))
      {
        $this->copy($originDir.DIRECTORY_SEPARATOR.$file, $targetDir.DIRECTORY_SEPARATOR.$file, $options);
      }
      else if (is_link($originDir.DIRECTORY_SEPARATOR.$file))
      {
        $this->symlink($originDir.DIRECTORY_SEPARATOR.$file, $targetDir.DIRECTORY_SEPARATOR.$file);
      }
      else
      {
        throw new sfException(sprintf('Unable to guess "%s" file type.', $file));
      }
    }
  }

  /**
   * Executes a shell command.
   *
   * @param string $cmd            The command to execute on the shell
   * @param array  $stdoutCallback A callback for stdout output
   * @param array  $stderrCallback A callback for stderr output
   *
   * @return array An array composed of the content output and the error output
   */
  public function execute($cmd, $stdoutCallback = null, $stderrCallback = null)
  {
    $this->logSection('exec ', $cmd);

    $descriptorspec = array(
      1 => array('pipe', 'w'), // stdout
      2 => array('pipe', 'w'), // stderr
    );

    $process = proc_open($cmd, $descriptorspec, $pipes);
    if (!is_resource($process))
    {
      throw new RuntimeException('Unable to execute the command.');
    }

    stream_set_blocking($pipes[1], false);
    stream_set_blocking($pipes[2], false);

    $output = '';
    $err = '';
    while (!feof($pipes[1]) || !feof($pipes[2]))
    {
      foreach ($pipes as $key => $pipe)
      {
        if (!$line = fread($pipe, 128))
        {
          continue;
        }

        if (1 == $key)
        {
          // stdout
          $output .= $line;
          if ($stdoutCallback)
          {
            call_user_func($stdoutCallback, $line);
          }
        }
        else
        {
          // stderr
          $err .= $line;
          if ($stderrCallback)
          {
            call_user_func($stderrCallback, $line);
          }
        }
      }

      usleep(100000);
    }

    fclose($pipes[1]);
    fclose($pipes[2]);

    if (($return = proc_close($process)) > 0)
    {
      throw new RuntimeException('Problem executing command.', $return);
    }

    return array($output, $err);
  }

  /**
   * Replaces tokens in an array of files.
   *
   * @param array  $files       An array of filenames
   * @param string $beginToken  The begin token delimiter
   * @param string $endToken    The end token delimiter
   * @param array  $tokens      An array of token/value pairs
   */
  public function replaceTokens($files, $beginToken, $endToken, $tokens)
  {
    if (!is_array($files))
    {
      $files = array($files);
    }

    foreach ($files as $file)
    {
      $content = file_get_contents($file);
      foreach ($tokens as $key => $value)
      {
        $content = str_replace($beginToken.$key.$endToken, $value, $content, $count);
      }

      $this->logSection('tokens', $file);

      file_put_contents($file, $content);
    }
  }

  /**
   * Logs a message in a section.
   *
   * @param string $section  The section name
   * @param string $message  The message
   * @param int    $size     The maximum size of a line
   */
  protected function logSection($section, $message, $size = null)
  {
    if (!$this->dispatcher)
    {
      return;
    }

    $message = $this->formatter ? $this->formatter->formatSection($section, $message, $size) : $section.' '.$message."\n";

    $this->dispatcher->notify(new sfEvent($this, 'command.log', array($message)));
  }

  /**
   * Calculates the relative path from one to another directory.
   *
   * If the paths share no common path the absolute target dir is returned.
   *
   * @param string $from The directory from which to calculate the relative path
   * @param string $to   The target directory
   *
   * @return string
   */ 
  protected function calculateRelativeDir($from, $to)
  {
    $from = $this->canonicalizePath($from);
    $to = $this->canonicalizePath($to);

    $commonLength = 0;
    $minPathLength = min(strlen($from), strlen($to));

    // count how many chars the strings have in common
    for ($i = 0; $i < $minPathLength; $i++)
    {
      if ($from[$i] != $to[$i])
      {
        break;
      }

      if (DIRECTORY_SEPARATOR == $from[$i])
      {
        $commonLength = $i + 1;
      }
    }

    if ($commonLength)
    {
      if (extension_loaded('mbstring'))
      {
        $levelUp = mb_substr_count(mb_strcut($from, $commonLength), DIRECTORY_SEPARATOR);
      }
      else
      {
        $levelUp = substr_count($from, DIRECTORY_SEPARATOR, $commonLength);
      }

      // up that many level
      $relativeDir = str_repeat('..'.DIRECTORY_SEPARATOR, $levelUp);

      // down the remaining $to path
      $relativeDir .= substr($to, $commonLength);

      return $relativeDir;
    }

    return $to;
  }

  /**
   * @param string A filesystem path
   *
   * @return string
   */
  protected function canonicalizePath($path)
  {
    if (empty($path))
    {
      return '';
    }

    $out = array();
    foreach (explode(DIRECTORY_SEPARATOR, $path) as $i => $fold)
    {
      if ('' == $fold || '.' == $fold)
      {
        continue;
      }

      if ('..' == $fold && $i > 0 && '..' != end($out))
      {
        array_pop($out);
      }
      else
      {
        $out[] = $fold;
      }
    }

    $result  = DIRECTORY_SEPARATOR == $path[0] ? DIRECTORY_SEPARATOR : '';
    $result .= implode(DIRECTORY_SEPARATOR, $out);
    $result .= DIRECTORY_SEPARATOR == $path[strlen($path) - 1] ? DIRECTORY_SEPARATOR : '';

    return $result;
  }
}