if page.comments
  if theme.gitment && theme.gitment.enable
    include ./gitment.pug
  else if theme.gitalk && theme.gitalk.enable
    include ./gitalk.pug
  else if theme.livere && theme.livere.enable
    include ./livere.pug
  else if theme.disqus && theme.disqus.enable
    include ./disqus.pug
  else if theme.valine && theme.valine.enable
    include ./valine.pug
else if theme.valine && theme.valine.enable && theme.valine.visitor
  include ./valine.pug