group.add_argument('--search',action='store',type=str,metavar='STRING',help='does a basic case-sensitive search in the feed')
group.add_argument('--clip',action='store_true',help='stick the full article content under the original feed content (useful for twitter)')
group.add_argument('--indent',action='store_true',help='returns indented XML or JSON, takes more place, but human-readable')
group=parser.add_argument_group('action')
group.add_argument('--cache',action='store_true',help='only take articles from the cache (ie. don\'t grab new articles\' content), so as to save time')
group.add_argument('--force',action='store_true',help='force refetch the rss feed and articles')
group.add_argument('--proxy',action='store_true',help='doesn\'t fill the articles')
group.add_argument('--order',default='first',choices=('first','last','newest','oldest'),help='order in which to process items (which are however NOT sorted in the output)')
group.add_argument('--items',action='store',type=str,metavar='XPATH',help='(mandatory to activate the custom feeds function) xpath rule to match all the RSS entries')
group.add_argument('--item_link',action='store',type=str,metavar='XPATH',help='xpath rule relative to items to point to the entry\'s link')