old_contents: # -*- coding: utf-8 -*-
  
  # Copyright © 2014 Roberto Alsina
  
  # Permission is hereby granted, free of charge, to any
  # person obtaining a copy of this software and associated
  # documentation files (the "Software"), to deal in the
  # Software without restriction, including without limitation
  # the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the
  # Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice
  # shall be included in all copies or substantial portions of
  # the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  # PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
  # OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  # OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  from difflib import HtmlDiff
  
  from docutils import nodes
  from docutils.parsers.rst import Directive, directives
  
  from nikola.plugin_categories import RestExtension
  from nikola.utils import LOGGER
  
  
  class Plugin(RestExtension):
  
      name = "rstdiff"
  
      def set_site(self, site):
          self.site = site
          directives.register_directive('diff', Diff)
          return super(Plugin, self).set_site(site)
  
  class Diff(Directive):
      """Restructured Text extension to display files side-by-side."""
  
      has_content = False
      required_arguments = 0
      option_spec = {
          "left": directives.unchanged,
          "right": directives.unchanged,
      }
  
      def run(self):
          with open(self.options['left']) as left:
              left_lines = left.readlines()
          with open(self.options['right']) as right:
              right_lines = right.readlines()
          diff = HtmlDiff()
          print diff.make_table(left_lines, right_lines)
          return [nodes.raw('', diff.make_table(left_lines, right_lines), format='html')]
  
  
new_contents: # -*- coding: utf-8 -*-
  
  # Copyright © 2014 Roberto Alsina
  
  # Permission is hereby granted, free of charge, to any
  # person obtaining a copy of this software and associated
  # documentation files (the "Software"), to deal in the
  # Software without restriction, including without limitation
  # the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the
  # Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice
  # shall be included in all copies or substantial portions of
  # the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  # PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
  # OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  # OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  from difflib import HtmlDiff
  
  from docutils import nodes
  from docutils.parsers.rst import Directive, directives
  
  from nikola.plugin_categories import RestExtension
  
  
  class Plugin(RestExtension):
  
      name = "rstdiff"
  
      def set_site(self, site):
          self.site = site
          directives.register_directive('diff', Diff)
          return super(Plugin, self).set_site(site)
  
  
  class Diff(Directive):
      """Restructured Text extension to display files side-by-side."""
  
      has_content = False
      required_arguments = 0
      option_spec = {
          "left": directives.unchanged,
          "right": directives.unchanged,
      }
  
      def run(self):
          with open(self.options['left']) as left:
              left_lines = left.readlines()
          with open(self.options['right']) as right:
              right_lines = right.readlines()
          diff = HtmlDiff()
          print diff.make_table(left_lines, right_lines)
          return [nodes.raw('', diff.make_table(left_lines, right_lines), format='html')]
  
subject: Fix the flake8 warning rstdiff