message: Add fixes for sphinx 3.0
diff: @@ -16,21 +16,29 @@ from sphinx.util import logging
  PythonDomain.object_types['parameter'] = ObjType('parameter', 'param')
  -if 'getLogger' in logging.__dir__():
  +if 'getLogger' in dir(logging):
  LOG = logging.getLogger(__name__)
  else:
  LOG = None
  +def get_indexentries(app):
  + try:
  + return app.env.get_domain('index').data['entries']
  + except:
  + pass
  + return app.env.indexentries
  +
  +
  def _is_html(app):
  return app.builder.name in ('html', 'readthedocs')
  def _tempdata(app):
  - if '_sphinx_paramlinks_index' in app.env.indexentries:
  - idx = app.env.indexentries['_sphinx_paramlinks_index']
  + if '_sphinx_paramlinks_index' in get_indexentries(app):
  + idx = get_indexentries(app)['_sphinx_paramlinks_index']
  else:
  - app.env.indexentries['_sphinx_paramlinks_index'] = idx = {}
  + get_indexentries(app)['_sphinx_paramlinks_index'] = idx = {}
  return idx
  @@ -210,6 +218,9 @@ def lookup_params(app, env, node, contnode):
  def add_stylesheet(app):
  + if 'add_css_file' in dir(app):
  + app.add_css_file('sphinx_paramlinks.css')
  + else:
  app.add_stylesheet('sphinx_paramlinks.css')
  @@ -242,13 +253,16 @@ def build_index(app, doctree):
  for docname in entries:
  doc_entries = entries[docname]
  - app.env.indexentries[docname].extend(doc_entries)
  + get_indexentries(app)[docname].extend(doc_entries)
  for entry in doc_entries:
  sing, desc, ref, extra = entry[:4]
  + if LooseVersion(__version__) >= LooseVersion('3.0.0'):
  + app.env.domains['py'].data['objects'][ref] = (docname, ref, 'parameter')
  + else:
  app.env.domains['py'].data['objects'][ref] = (docname, 'parameter')
  - app.env.indexentries.pop('_sphinx_paramlinks_index')
  + get_indexentries(app).pop('_sphinx_paramlinks_index')
  def setup(app):
  