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bzrlib/progress.py
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from collections import deque
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def _width():
 
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    """Return estimated terminal width.
 
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    TODO: Do something smart on Windows?
 
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    TODO: Is there anything that gets a better update when the window
 
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          is resized while the program is running?
 
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    """
 
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    try:
 
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        return int(os.environ['COLUMNS'])
 
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    except (IndexError, KeyError, ValueError):
 
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        return 80
 
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def _supports_progress(f):
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    if not hasattr(f, 'isatty'):
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        return False
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    def __init__(self, **kwargs):
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        from bzrlib.osutils import terminal_width
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        _BaseProgressBar.__init__(self, **kwargs)
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        self.spin_pos = 0
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        self.width = terminal_width()
 
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        self.width = _width()
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        self.start_time = None
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        self.last_update = None
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        self.last_updates = deque()