old_contents: # -*- coding: utf-8 -*-
  """
      doilinks
      ~~~~~~~~~~~~~~~~~~~
      Extension to add links to DOIs. With this extension you can use e.g.
      :doi:`10.1016/S0022-2836(05)80360-2` in your documents. This will
      create a link to a DOI resolver
      (``https://doi.org/10.1016/S0022-2836(05)80360-2``).
      The link caption will be the raw DOI.
      You can also give an explicit caption, e.g.
      :doi:`Basic local alignment search tool <10.1016/S0022-2836(05)80360-2>`.
  
      :copyright: Copyright 2015  Jon Lund Steffensen. Based on extlinks by
          the Sphinx team.
      :license: BSD.
  """
  
  from docutils import nodes, utils
  
  from sphinx.util.nodes import split_explicit_title
  
  
  def doi_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
      text = utils.unescape(text)
      has_explicit_title, title, part = split_explicit_title(text)
      full_url = 'https://doi.org/' + part
      if not has_explicit_title:
          title = 'DOI:' + part
      pnode = nodes.reference(title, title, internal=False, refuri=full_url)
      return [pnode], []
  
  
  def arxiv_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
      text = utils.unescape(text)
      has_explicit_title, title, part = split_explicit_title(text)
      full_url = 'https://arxiv.org/abs/' + part
      if not has_explicit_title:
          title = 'arXiv:' + part
      pnode = nodes.reference(title, title, internal=False, refuri=full_url)
      return [pnode], []
  
  
  def setup_link_role(app):
      app.add_role('doi', doi_role)
      app.add_role('DOI', doi_role)
      app.add_role('arXiv', arxiv_role)
      app.add_role('arxiv', arxiv_role)
  
  
  def setup(app):
      app.connect('builder-inited', setup_link_role)
      return {'version': '0.1', 'parallel_read_safe': True}
  
new_contents: # -*- coding: utf-8 -*-
  """
      doilinks
      ~~~~~~~~
      Extension to add links to DOIs. With this extension you can use e.g.
      :doi:`10.1016/S0022-2836(05)80360-2` in your documents. This will
      create a link to a DOI resolver
      (``https://doi.org/10.1016/S0022-2836(05)80360-2``).
      The link caption will be the raw DOI.
      You can also give an explicit caption, e.g.
      :doi:`Basic local alignment search tool <10.1016/S0022-2836(05)80360-2>`.
  
      :copyright: Copyright 2015  Jon Lund Steffensen. Based on extlinks by
          the Sphinx team.
      :license: BSD.
  """
  
  from docutils import nodes, utils
  
  from sphinx.util.nodes import split_explicit_title
  
  
  def doi_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
      text = utils.unescape(text)
      has_explicit_title, title, part = split_explicit_title(text)
      full_url = 'https://doi.org/' + part
      if not has_explicit_title:
          title = 'DOI:' + part
      pnode = nodes.reference(title, title, internal=False, refuri=full_url)
      return [pnode], []
  
  
  def arxiv_role(typ, rawtext, text, lineno, inliner, options={}, content=[]):
      text = utils.unescape(text)
      has_explicit_title, title, part = split_explicit_title(text)
      full_url = 'https://arxiv.org/abs/' + part
      if not has_explicit_title:
          title = 'arXiv:' + part
      pnode = nodes.reference(title, title, internal=False, refuri=full_url)
      return [pnode], []
  
  
  def setup_link_role(app):
      app.add_role('doi', doi_role, override=True)
      app.add_role('DOI', doi_role, override=True)
      app.add_role('arXiv', arxiv_role, override=True)
      app.add_role('arxiv', arxiv_role, override=True)
  
  
  def setup(app):
      app.connect('builder-inited', setup_link_role)
      return {'version': '0.1', 'parallel_read_safe': True}
  
subject: fix doc build warning about arxiv role already being registered