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bzrlib/diff.py
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    else:
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        new_tree = b.revision_tree(revision2.in_history(b).rev_id)
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    show_diff_trees(old_tree, new_tree, output, specific_files,
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                    external_diff_options)
 
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    return show_diff_trees(old_tree, new_tree, output, specific_files,
 
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                           external_diff_options)
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    delta = compare_trees(old_tree, new_tree, want_unchanged=False,
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                          specific_files=specific_files)
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    has_changes = 0
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    for path, file_id, kind in delta.removed:
 
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        has_changes = 1
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        print >>to_file, '=== removed %s %r' % (kind, path)
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        old_tree.inventory[file_id].diff(diff_file, old_label + path, old_tree,
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                                         DEVNULL, None, None, to_file)
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    for path, file_id, kind in delta.added:
 
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        has_changes = 1
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        print >>to_file, '=== added %s %r' % (kind, path)
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        new_tree.inventory[file_id].diff(diff_file, new_label + path, new_tree,
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                                         DEVNULL, None, None, to_file, 
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                                         reverse=True)
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    for (old_path, new_path, file_id, kind,
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         text_modified, meta_modified) in delta.renamed:
 
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        has_changes = 1
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        prop_str = get_prop_change(meta_modified)
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        print >>to_file, '=== renamed %s %r => %r%s' % (
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                          kind, old_path, new_path, prop_str)
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                                    new_label, new_path, new_tree,
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                                    text_modified, kind, to_file, diff_file)
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    for path, file_id, kind, text_modified, meta_modified in delta.modified:
 
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        has_changes = 1
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        prop_str = get_prop_change(meta_modified)
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        print >>to_file, '=== modified %s %r%s' % (kind, path, prop_str)
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        if text_modified:
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            _maybe_diff_file_or_symlink(old_label, path, old_tree, file_id,
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                                        new_label, path, new_tree,
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                                        True, kind, to_file, diff_file)
 
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    return has_changes
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def get_prop_change(meta_modified):