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我正在使用Commander.js编写我自己的 CLI。我设法编写了单独工作的命令，但现在我需要实现子命令，但文档有点模糊和混乱，所以我无法弄清楚。

我想要的是connect连接到 MongoDB 实例的命令，当它完成后继续执行get命令。我怎样才能做到这一点？

这些是命令和package.json：

./package.json：

{
  ...
  "main": "./commands/my-cli.js",
  "bin": "./commands/my-cli.js",
  ...
}

./commands/my-cli.js：

const commander = require('commander');
const program = new commander.Command();

const connect = require('./my-cli-connect');
const get = require('./my-cli-get');

// Initialize each command
connect(program);
get(program);

./commands/my-cli-connect.js：

function connect(program) {

  program
    .command('connect <db> <username> <password>', 'Connects to a database')
    .action((db, username, password) => {

      MongoClient.connect(<some-mongo-url>, {useNewUrlParser: true}, (err, connection) => {

        assert.equal(null, err, 'Failed to connect to MongoDB instance');

        // Continue here with the get command
      });
    }); 

  program.parse(process.argv);
}

module.exports = connect;

./commands/my-cli-get.js：

function get(program) {

  program
    .command('get <collection>')
    .option('-q,--query <query>', 'Search terms', jsonParser, {})
    .description('Returns documents from a MongoDB collection')
    .action(action);

  program.parse(process.argv);

  function action(collection, options) {

    // This never runs
    console.log('hello world');
  }
}

module.exports = get;

运行my-cli --help显示这些可用命令：

...

Commands:
  connect <db> <username> <password>  Connects to a database
  help [cmd]                          display help for [cmd]

应该同时调用两者connect以及get何时connect完成连接的示例命令执行：

$ my-cli connect myDb myUser myPass get users -q '{"email": "foo@gmail.com"}'

现在该get命令的action功能永远不会运行。

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