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_global_option('dry-run',
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help="Show what would be done, but don't actually do anything.")
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_global_option('name-from-revision', help='The path name in the old tree.')
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_global_option('directory', short_name='d', type=unicode,
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diff_writer_registry = _mod_registry.Registry()
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diff_writer_registry.register('plain', lambda x: x, 'Plaintext diff output.')