docs: def cli(ctx, vcf, verbose, outfile, silent):
      """Simple vcf operations"""
      # configure root logger to print to STDERR
      loglevel = LEVELS.get(min(verbose, 3))
      configure_stream(level=loglevel)
      
      if vcf == '-':
          handle = get_vcf_handle(fsock=sys.stdin)
      else:
          handle = get_vcf_handle(infile=vcf)
      
      head = HeaderParser()
      for line in handle:
          line = line.rstrip()
          if line.startswith('#'):
              if line.startswith('##'):
                  head.parse_meta_data(line)
              else:
                  head.parse_header_line(line)
          else:
              break
      ctx.head = head
  
      ctx.handle = itertools.chain([line], handle)
      ctx.outfile = outfile
      ctx.silent = silent