TypeScript yargs-parser類代碼示例

export async function runCommand(commandMap: CommandMap,
                                 args: string[],
                                 logger: logging.Logger,
                                 context: CommandContext): Promise<any> {

  // if not args supplied, just run the help command.
  if (!args || args.length === 0) {
    args = ['help'];
  }
  const rawOptions = yargsParser(args, { alias: { help: ['h'] }, boolean: [ 'help' ] });
  let commandName = rawOptions._[0];

  // remove the command name
  rawOptions._ = rawOptions._.slice(1);
  const executionScope = context.project.isEmberCLIProject()
    ? CommandScope.inProject
    : CommandScope.outsideProject;

  let Cmd: CommandConstructor;
  Cmd = findCommand(commandMap, commandName);

  if (!Cmd && !commandName && (rawOptions.v || rawOptions.version)) {
    commandName = 'version';
    Cmd = findCommand(commandMap, commandName);
  }

  if (!Cmd && rawOptions.help) {
    commandName = 'help';
    Cmd = findCommand(commandMap, commandName);
  }

  if (!Cmd) {
    logger.error(oneLine`The specified command (${commandName}) is invalid.
    For a list of available options, run \`ng help\`.`);
    throw '';
  }

  const command = new Cmd(context, logger);

  args = await command.initializeRaw(args);
  let options = parseOptions(args, command.options, command.arguments, command.argStrategy);
  await command.initialize(options);
  options = parseOptions(args, command.options, command.arguments, command.argStrategy);
  if (commandName === 'help') {
    options.commandMap = commandMap;
  }

  if (options.help) {
    return await runHelp(command, options);
  } else {
    verifyCommandInScope(command, executionScope);
    delete options.h;
    delete options.help;
    return await validateAndRunCommand(command, options);
  }
}

export async function runCommand(commandMap: CommandMap,
                                 args: string[],
                                 logger: logging.Logger,
                                 context: CommandContext): Promise<number | void> {

  // if not args supplied, just run the help command.
  if (!args || args.length === 0) {
    args = ['help'];
  }
  const rawOptions = yargsParser(args, { alias: { help: ['h'] }, boolean: [ 'help' ] });
  let commandName = rawOptions._[0];

  // remove the command name
  rawOptions._ = rawOptions._.slice(1);
  const executionScope = insideProject()
    ? CommandScope.inProject
    : CommandScope.outsideProject;

  let Cmd: CommandConstructor | null;
  Cmd = findCommand(commandMap, commandName);

  if (!Cmd && !commandName && (rawOptions.v || rawOptions.version)) {
    commandName = 'version';
    Cmd = findCommand(commandMap, commandName);
  }

  if (!Cmd && rawOptions.help) {
    commandName = 'help';
    Cmd = findCommand(commandMap, commandName);
  }

  if (!Cmd) {
    const commandsDistance = {} as { [name: string]: number };
    const allCommands = listAllCommandNames(commandMap).sort((a, b) => {
      if (!(a in commandsDistance)) {
        commandsDistance[a] = levenshtein(a, commandName);
      }
      if (!(b in commandsDistance)) {
        commandsDistance[b] = levenshtein(b, commandName);
      }

      return commandsDistance[a] - commandsDistance[b];
    });

    logger.error(tags.stripIndent`
        The specified command ("${commandName}") is invalid. For a list of available options,
        run "ng help".

        Did you mean "${allCommands[0]}"?
    `);

    return 1;
  }

  const command = new Cmd(context, logger);

  args = await command.initializeRaw(args);
  let options = parseOptions(args, command.options, command.arguments, command.argStrategy);
  await command.initialize(options);
  options = parseOptions(args, command.options, command.arguments, command.argStrategy);
  if (commandName === 'help') {
    options.commandMap = commandMap;
  }

  if (options.help) {
    command.printHelp(options);

    return;
  } else {
    if (Cmd.scope !== undefined && Cmd.scope !== CommandScope.everywhere) {
      if (Cmd.scope !== executionScope) {
        let errorMessage;
        if (Cmd.scope === CommandScope.inProject) {
          errorMessage = `This command can only be run inside of a CLI project.`;
        } else {
          errorMessage = `This command can not be run inside of a CLI project.`;
        }
        logger.fatal(errorMessage);

        return 1;
      }

      if (Cmd.scope === CommandScope.inProject) {
        if (!context.project.configFile) {
          logger.fatal('Invalid project: missing workspace file.');

          return 1;
        }

        if (['.angular-cli.json', 'angular-cli.json'].includes(context.project.configFile)) {
          // --------------------------------------------------------------------------------
          // If changing this message, please update the same message in
          // `packages/@angular/cli/bin/ng-update-message.js`
          const message = tags.stripIndent`
            The Angular CLI configuration format has been changed, and your existing configuration
            can be updated automatically by running the following command:

              ng update @angular/cli
          `;

//.........這裏部分代碼省略.........

export async function runCommand(commandMap: CommandMap,
                                 args: string[],
                                 logger: logging.Logger,
                                 context: CommandContext): Promise<number | void> {

  // if not args supplied, just run the help command.
  if (!args || args.length === 0) {
    args = ['help'];
  }
  const rawOptions = yargsParser(args, { alias: { help: ['h'] }, boolean: [ 'help' ] });
  let commandName = rawOptions._[0];

  // remove the command name
  rawOptions._ = rawOptions._.slice(1);
  const executionScope = context.project.isEmberCLIProject()
    ? CommandScope.inProject
    : CommandScope.outsideProject;

  let Cmd: CommandConstructor;
  Cmd = findCommand(commandMap, commandName);

  if (!Cmd && !commandName && (rawOptions.v || rawOptions.version)) {
    commandName = 'version';
    Cmd = findCommand(commandMap, commandName);
  }

  if (!Cmd && rawOptions.help) {
    commandName = 'help';
    Cmd = findCommand(commandMap, commandName);
  }

  if (!Cmd) {
    function levenshtein(a: string, b: string): number {
      if (a.length === 0) {
        return b.length;
      }
      if (b.length === 0) {
        return a.length;
      }

      if (a.length > b.length) {
        let tmp = a;
        a = b;
        b = tmp;
      }

      const row = Array(a.length);
      for (let i = 0; i <= a.length; i++) {
        row[i] = i;
      }

      let result: number;
      for (let i = 1; i <= b.length; i++) {
        result = i;

        for (let j = 1; j <= a.length; j++) {
          let tmp = row[j - 1];
          row[j - 1] = result;
          result = b[i - 1] === a[j - 1]
            ? tmp
            : Math.min(tmp + 1, Math.min(result + 1, row[j] + 1));
        }
      }

      return result;
    }

    const commandsDistance = {} as { [name: string]: number };
    const allCommands = listAllCommandNames(commandMap).sort((a, b) => {
      if (!(a in commandsDistance)) {
        commandsDistance[a] = levenshtein(a, commandName);
      }
      if (!(b in commandsDistance)) {
        commandsDistance[b] = levenshtein(b, commandName);
      }
      return commandsDistance[a] - commandsDistance[b];
    });

    logger.error(tags.stripIndent`
        The specified command ("${commandName}") is invalid. For a list of available options,
        run "ng help".

        Did you mean "${allCommands[0]}"?
    `);

    return 1;
  }

  const command = new Cmd(context, logger);

  args = await command.initializeRaw(args);
  let options = parseOptions(args, command.options, command.arguments, command.argStrategy);
  await command.initialize(options);
  options = parseOptions(args, command.options, command.arguments, command.argStrategy);
  if (commandName === 'help') {
    options.commandMap = commandMap;
  }

  if (options.help) {
    return await runHelp(command, options);
//.........這裏部分代碼省略.........