docs: def dump_index(args, idx):
      """Create a metatab file for the index"""
  
      import csv
      import sys
  
      from metatab import MetatabDoc
  
      doc = MetatabDoc()
  
      pack_section = doc.new_section('Packages', ['Identifier', 'Name', 'Nvname', 'Version', 'Format'])
  
      r = doc['Root']
      r.new_term('Root.Title', 'Package Index')
  
      for p in idx.list():
  
          pack_section.new_term('Package',
                     p['url'],
                     identifier=p['ident'],
                     name=p['name'],
                     nvname=p['nvname'],
                     version=p['version'],
                     format=p['format'])
  
      doc.write_csv(args.dump)