docs: def add(args):
      """
      cdstarcat add SPEC
  
      Add metadata about objects (specified by SPEC) in CDSTAR to the catalog.
      SPEC: Either a CDSTAR object ID or a query.
      """
      spec = args.args[0]
      with _catalog(args) as cat:
          n = len(cat)
          if OBJID_PATTERN.match(spec):
              cat.add_objids(spec)
          else:
              results = cat.add_query(spec)
              args.log.info('{0} hits for query {1}'.format(results, spec))
          args.log.info('{0} objects added'.format(len(cat) - n))
          return len(cat) - n