/// 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";
