custom autofix linter

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protected function parseLinterOutput($path, $err, $stdout, $stderr) {
  $messages = array();
  $matches = split("\n", $stdout, 2);

  $description = $matches[0];
  $diff = $matches[1];

  $parser = new ArcanistDiffParser();
  $changes = $parser->parseDiff($diff);

  foreach ($changes as $change) {
    foreach ($change->getHunks() as $hunk) {
      $oldText = array();
      $newText = array();

      $replacementText = "";
      $originalText = "";

      $lines = phutil_split_lines($hunk->getCorpus(), false);
      foreach ($lines as $line) {
        $char = strlen($line) ? $line[0] : '~';
        $rest = "\n" . strlen($line) == 1 ? '' : substr($line, 1);

        switch ($char) {
          case '-':
          $originalText .= $rest;
          break;

          case '+':
          $replacementText .= $rest;
          break;

          case '~':
          break;

          case ' ':
          $originalText .= $rest;
          $replacementText .= $rest;
          break;
        }
      }

      $message = new ArcanistLintMessage();
      $message->setPath($path);
      $message->setLine($hunk->getOldOffset());
      $message->setChar(0);
      $message->setCode('Improper imports');
      $message->setName('ISORT');
      // $message->setSeverity(ArcanistLintSeverity::SEVERITY_AUTOFIX);
      $message->setSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
      $message->setReplacementText($replacementText);
      $message->setOriginalText($originalText);

      $messages[] = $message;
    }
  }

  if ($err && !$messages) {
    return false;
  }

  return $messages;
}