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bzrlib/status.py
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            (2, 3), None))
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hooks = StatusHooks()
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class StatusHookParams(object):
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    """Object holding parameters passed to post_status hooks.
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            self.old_tree, self.new_tree, self.to_file, self.versioned,
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            self.show_ids, self.short, self.verbose)
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def _show_shelve_summary(params):
 
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    """post_status hook to display a summary of shelves.
 
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    :param params: StatusHookParams.
 
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    """
 
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    get_shelf_manager = getattr(params.new_tree, 'get_shelf_manager', None)
 
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    if get_shelf_manager is None:
 
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        return
 
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    manager = get_shelf_manager()
 
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    shelves = manager.active_shelves()
 
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    if shelves:
 
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        singular = '%d shelf exists. '
 
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        plural = '%d shelves exist. '
 
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        if len(shelves) == 1:
 
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            fmt = singular
 
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        else:
 
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            fmt = plural
 
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        params.to_file.write(fmt % len(shelves))
 
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        params.to_file.write('See "bzr shelve --list" for details.\n')
 
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hooks = StatusHooks()
 
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hooks.install_named_hook('post_status', _show_shelve_summary,
 
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    'bzr status')
 
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