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a/migrate-3rdparty/trac_export.py b/migrate-3rdparty/trac_export.py
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    optparser = OptionParser(usage=''' %prog <Trac URL>
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    optparser = OptionParser(usage=''' %prog <Trac URL>
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Export ticket data from a Trac instance''')
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Export ticket data from a Trac instance''')
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    optparser.add_option('-o', '--out-file', dest='out_filename', help='Write to file (default stdout)')
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    optparser.add_option('-o', '--out-file', dest='out_filename', help='Write to file (default stdout)')
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    optparser.add_option('--attachments', dest='do_attachments', action='store_true', help='Export attachment info')
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    optparser.add_option('--attachments', dest='do_attachments', action='store_true', help='Export attachment info')
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    optparser.add_option('--only-tickets', dest='only_tickets', action='store_true', help='Export only ticket list')
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    optparser.add_option('--start', dest='start_id', type='int', default=1, help='Start with given ticket numer (or next accessible)')
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    optparser.add_option('--start', dest='start_id', type='int', default=1, help='Start with given ticket numer (or next accessible)')
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    optparser.add_option('--limit', dest='limit', type='int', default=None, help='Limit number of tickets')
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    optparser.add_option('--limit', dest='limit', type='int', default=None, help='Limit number of tickets')
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    optparser.add_option('-v', '--verbose', dest='verbose', action='store_true', help='Verbose operation')
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    optparser.add_option('-v', '--verbose', dest='verbose', action='store_true', help='Verbose operation')
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    options, args = optparser.parse_args()
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    options, args = optparser.parse_args()
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    if len(args) != 1:
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    if len(args) != 1:
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        return json.JSONEncoder.default(self, obj)
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        return json.JSONEncoder.default(self, obj)
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if __name__ == '__main__':
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if __name__ == '__main__':
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    options, args = parse_options()
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    options, args = parse_options()
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    ex = TracExport(args[0], start_id=options.start_id)
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    ex = TracExport(args[0], start_id=options.start_id)
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    # Implement iterator sequence limiting using islice()
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    doc = [t for t in islice(ex, options.limit)]
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    doc = [t for t in islice(ex, options.limit)]
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    if not options.only_tickets:
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        doc = {
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            'class': 'PROJECT',
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            'trackers': {'default': {'artifacts': doc}}
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        }
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    out_file = sys.stdout
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    out_file = sys.stdout
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    if options.out_filename:
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    if options.out_filename:
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        out_file = open(options.out_filename, 'w')
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        out_file = open(options.out_filename, 'w')
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    out_file.write(json.dumps(doc, cls=DateJSONEncoder, indent=2, sort_keys=True))
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    out_file.write(json.dumps(doc, cls=DateJSONEncoder, indent=2, sort_keys=True))
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    # It's bad habit not to terminate lines
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    # It's bad habit not to terminate lines