code: def setup(app):
      
      import sphinx
      from .parser import CommonMarkParser
  
      if sphinx.version_info >= (1, 8):
          app.add_source_suffix('.md', 'markdown')
          app.add_source_parser(CommonMarkParser)
      elif sphinx.version_info >= (1, 4):
          app.add_source_parser('.md', CommonMarkParser)
  
      return {'version': __version__, 'parallel_read_safe': True}
docs: Initialize Sphinx extension.