docs: def domain_sites():
      """
      Get a list of domains
      
      Each domain is an attribute dict with name, site_id and settings
      """
  
      if not hasattr(env,'domains'):
          sites = _get_django_sites()
          site_ids = sites.keys()
          site_ids.sort()
          domains = []
          
          for id in site_ids:
  
              for file in _sitesettings_files():
                  domain = _AttributeDict({})
  
                  if file == 'settings.py':
                      domain.name = sites[id]
                  else: #prefix indicates subdomain
                      subdomain = file[:-12].replace('_','.')
                      domain.name = ''.join([subdomain,sites[id]])
  
                  domain.settings = file
                  domain.site_id = id
                  domains.append(domain)
                  
          env.domains = domains
          if env.domains: env.root_domain = env.domains[0].name
          else:
              domain.name = _root_domain(); domain.site_id = 1; domain.settings='settings.py'
              env.domains = [domain]
              
      return env.domains