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:param using: Commandline to use to invoke an external diff tool
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if external_diff_options:
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opts = external_diff_options.split()
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def diff_file(olab, olines, nlab, nlines, to_file, path_encoding=None):
924
def diff_file(olab, olines, nlab, nlines, to_file):
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external_diff(olab, olines, nlab, nlines, to_file, opts)
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diff_file = internal_diff