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/// todo 子命令常量 pub const CMD_LIST: &str = "list"; pub const CMD_ADD: &str = "add"; /// list 子命令的过滤选项 pub const FILTER_DONE: &str = "--done"; pub const FILTER_DONE_SHORT: &str = "-d"; pub const FILTER_UNDONE: &str = "--undone"; pub const FILTER_UNDONE_SHORT: &str = "-u";