old_contents: from __future__ import absolute_import, division, print_function, unicode_literals
  
  import markdown
  from nib import Processor, markup
  
  @markup(['.md', '.mkdn'])
  class MarkdownProcessor(Processor):
      def __init__(self, options):
          self.options = options
          self.markdown = markdown.Markdown(output_format='html5')
  
      def document(self, document):
          document.short = self.markdown.reset().convert(document.short)
          document.content = self.markdown.reset().convert(document.content)
          document.extension = '.html'
          return document
  
new_contents: from __future__ import absolute_import, division, print_function, unicode_literals
  
  import markdown
  from nib import Processor, markup
  
  @markup(['.md', '.mkdn'])
  class MarkdownProcessor(Processor):
      def __init__(self, options):
          self.options = options
          config = {
              'markdown.extensions.footnotes': {
                  'UNIQUE_IDS': True,
              },
          }
          self.markdown = markdown.Markdown(output_format='html5',
                                            extensions=config.keys(),
                                            extension_configs=config,
                                            )
  
      def document(self, document):
          document.short = self.markdown.reset().convert(document.short)
          document.content = self.markdown.reset().convert(document.content)
          document.extension = '.html'
          return document
  
subject: enable markdown footnotes extension