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Bram Schoenmakers authored
Moreover, make print_todo of PrettyPrinter have the same signature as the Printer class. Clients must use add_filter to specify any additional filters when printing. The Command class holds a PrettyPrinter instance (rather than a generic printer). This means that add_filter is called, all future invocations of print_todo will apply these filters. This is not always desired, so in those cases a subcommand should instantiate its own printer (this happens for instance at the DoCommand).
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