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import { flags } from "./deps.ts";
export interface Option {  name: string;  description?: string;  alias?: string;  args?: Argument[];  boolean?: boolean;}
export interface Argument {  name: string;  description?: string;  optional?: boolean;  multiple?: boolean;}
export interface Command {  name: string;  description?: string;  arguments?: Argument[];  options?: Option[];  commands?: Command[];  fn: (args: flags.Args) => void;}
export interface Program {  name: string;  description?: string;  commands: Command[];  version?: string;  fn?: (args: flags.Args) => void;}
export async function parse(program: Program, args: string[]) {  args = [...args];  const commandName = args.shift();  if (!commandName && !program.fn) {    throw new Error(`choose a subcommand`);  }  const command = program.commands.find((command) =>    command.name === commandName  );  if (!command) throw new Error(`command not found: ${commandName}`);  const options = command.options || [];
  const parsed: flags.Args = flags.parse(args, {    boolean: options      .filter(({ boolean }) => boolean)      .map(({ name }) => name),    alias: Object.fromEntries(      options        .filter((option) => option.alias)        .map((option) => [option.name, option.alias as string]),    ),  });
  for (const key of Object.keys(parsed)) {    if (key === "_") continue;    if (options.some((option) => option.alias === key)) continue;    const option = command.options?.find((option) => option.name === key);    if (!option) throw new Error(`option not found: ${key}`);  }
  await command.fn(parsed);}