old_contents: from os.path import abspath, dirname, join
  
  from coalib.bearlib.abstractions.Linter import linter
  
  
  jar = join(dirname(abspath(__file__)), 'scalastyle.jar')
  scalastyle_config_file = join(dirname(abspath(__file__)),
                                'scalastyle_config.xml')
  
  
  @linter(executable='java',
          output_format='regex',
          output_regex=r'(?P<severity>warning) file=.+ message=(?P<message>.+) '
                       r'line=(?P<line>\d+)(?: column=(?P<column>\d+))?',
          prerequisite_check_command=('java', '-jar', jar, '-c',
                                      scalastyle_config_file, '.', '-q', 'true'),
          prerequisite_check_fail_message='Required jar file ' + jar +
                                          ' not found.')
  class ScalaLintBear:
      """
      Checks the code with ``scalastyle`` on each file separately.
      """
  
      @staticmethod
      def create_arguments(filename, file, config_file,
                           scalalint_config: str=scalastyle_config_file):
          """
          :param scalalint_config: Path to a custom configuration file.
          """
          return '-jar', jar, filename, '--config', scalalint_config
  
new_contents: from os.path import abspath, dirname, join
  
  from coalib.bearlib.abstractions.Linter import linter
  
  
  jar = join(dirname(abspath(__file__)), 'scalastyle.jar')
  scalastyle_config_file = join(dirname(abspath(__file__)),
                                'scalastyle_config.xml')
  
  
  @linter(executable='java',
          output_format='regex',
          output_regex=r'(?P<severity>warning) file=.+ message=(?P<message>.+) '
                       r'line=(?P<line>\d+)(?: column=(?P<column>\d+))?',
          prerequisite_check_command=('java', '-jar', jar, '-c',
                                      scalastyle_config_file, '.', '-q', 'true'),
          prerequisite_check_fail_message='Required jar file ' + jar +
                                          ' not found.')
  class ScalaLintBear:
      """
      Check Scala code for codestyle, but also semantical problems,
      e.g. cyclomatic complexity.
      """
  
      LANGUAGES = ("Scala",)
  
      @staticmethod
      def create_arguments(filename, file, config_file,
                           scalalint_config: str=scalastyle_config_file):
          """
          :param scalalint_config: Path to a custom configuration file.
          """
          return '-jar', jar, filename, '--config', scalalint_config
  
subject: Improve documentation