old_contents: # -*- coding: utf-8 -*-
  
  # Copyright © 2013 Aru Sahni
  
  # 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 docutils import nodes
  from docutils.parsers.rst import roles
  
  from nikola.plugin_categories import RestExtension
  
  TAGS = {
      'strike': 'strike',
      'del': 'del',
      'ins': 'ins',
  }
  
  
  class Plugin(RestExtension):
  
      name = "html_roles"
  
      def set_site(self, site):
          self.site = site
          for role, tag in TAGS.items():
              roles.register_canonical_role(role, tag_role(tag))
          return super(Plugin, self).set_site(site)
  
  
  def tag_role(tag):
      """ Generates a role for the specified tag """
      def _spanning_role(role, rawtext, text, lineno, inliner,
                         options={}, content=[]):
          """ reStructuredText role for generating the a tag element """
          return [nodes.raw('', '<{tag}>{text}</{tag}>'.format(
              tag=tag, text=text), format='html')], []
      return _spanning_role
  
new_contents: # -*- coding: utf-8 -*-
  
  # Copyright © 2013 Aru Sahni
  
  # 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 docutils import nodes
  from docutils.parsers.rst import roles
  
  from nikola.plugin_categories import RestExtension
  
  TAGS = {
      's': 's',
      'del': 'del',
      'ins': 'ins',
  }
  
  
  class Plugin(RestExtension):
  
      name = "html_roles"
  
      def set_site(self, site):
          self.site = site
          for role, tag in TAGS.items():
              roles.register_canonical_role(role, tag_role(tag))
          return super(Plugin, self).set_site(site)
  
  
  def tag_role(tag):
      """ Generates a role for the specified tag """
      def _spanning_role(role, rawtext, text, lineno, inliner,
                         options={}, content=[]):
          """ reStructuredText role for generating the a tag element """
          return [nodes.raw('', '<{tag}>{text}</{tag}>'.format(
              tag=tag, text=text), format='html')], []
      return _spanning_role
  
subject: use <s> tag instead of deprecated <strike>