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bzrlib/osutils.py
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        raise NotBranchError("path %r is not within branch %r" % (rp, base))
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    return os.sep.join(s)
 
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def terminal_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? We could use the Python termcap
 
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    # library.
 
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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