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bzrlib/missing.py
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def iter_log_data(revisions, revision_source, verbose):
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    from bzrlib.diff import compare_trees
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    from bzrlib.tree import EmptyTree
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    last_tree = EmptyTree
 
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    last_tree = revision_source.revision_tree(None)
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    last_rev_id = None
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    for revno, rev_id in revisions:
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        rev = revision_source.get_revision(rev_id)
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            revision_tree = revision_source.revision_tree(rev_id)
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            last_rev_id = rev_id
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            last_tree = revision_tree
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            delta = compare_trees(revision_tree, parent_tree)
 
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            delta = parent_tree.changes_from(revision_tree)
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        else:
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            delta = None
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        yield revno, rev, delta