docs: def cli(ctx, dname, site):
      """
      Enable the <site> under the specified <domain>
      """
      assert isinstance(ctx, Context)
  
      dname = domain_parse(dname).hostname
      domain = Session.query(Domain).filter(Domain.name == dname).first()
      if not domain:
          click.secho('No such domain: {dn}'.format(dn=dname), fg='red', bold=True, err=True)
          return
  
      site_name = site
      site = Site.get(domain, site_name)
      if not site:
          click.secho('No such site: {site}'.format(site=site_name), fg='red', bold=True, err=True)
          return
  
      p = Echo('Constructing paths and configuration files...')
      site.enable()
      p.done()
  
      # Restart Nginx
      p = Echo('Restarting web server...')
      FNULL = open(os.devnull, 'w')
      subprocess.check_call(['service', 'nginx', 'restart'], stdout=FNULL, stderr=subprocess.STDOUT)
      p.done()