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import errno
import patiencediff
import subprocess
import tempfile

from breezy import (
    cleanup,
    controldir,
    osutils,
    textfile,
    timestamp,
    views,
    )

from breezy.workingtree import WorkingTree
from breezy.i18n import gettext
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    lines of context.  The number of context lines is set by 'n' which
    defaults to three.

    By default, the diff control lines (those with ---, +++, or @@) are
    created with a trailing newline.  This is helpful so that inputs
    created from file.readlines() result in diffs that are suitable for
    file.writelines() since both the inputs and outputs have trailing
    newlines.

    For inputs that do not have trailing newlines, set the lineterm
    argument to "" so that the output will be uniformly newline free.

    The unidiff format normally has a header for filenames and modification
    times.  Any or all of these may be specified using strings for
    'fromfile', 'tofile', 'fromfiledate', and 'tofiledate'.  The modification
    times are normally expressed in the format returned by time.ctime().

    Example:

    >>> for line in bytes_unified_diff(b'one two three four'.split(),
    ...             b'zero one tree four'.split(), b'Original', b'Current',
    ...             b'Sat Jan 26 23:30:50 1991', b'Fri Jun 06 10:20:52 2003',
    ...             lineterm=b''):
    ...     print line
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