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from bzrlib.revision import NULL_REVISION
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from bzrlib.tsort import merge_sort
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def linegraph(graph, start_revs, maxnum, broken_line_length = None,
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def linegraph(graph, start_revs, maxnum=None, broken_line_length=None,
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"""Produce a directed graph of a bzr repository.
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Returns a tuple of (line_graph, revid_index, columns_len) where