以编程方式关闭 Vorpal 实例答案

【问题标题】：Close Vorpal instance programmatically以编程方式关闭 Vorpal 实例
【发布时间】：2018-04-18 02:20:14
【问题描述】：

这涉及 node.js 的 vorpal CLI，如下所示：

const vorpal = require('vorpal')();

用户可以使用 Ctrl-C 关闭 vorpal，但是如何以编程方式关闭 vorpal？

例如，如果打开了一个 vorpal 终端会话，但 25 秒后没有收到进一步的标准输入，我想以编程方式关闭 vorpal，我的代码如下所示：

  vorpal
  .delimiter(shortCWD + chalk.magenta(' / suman>'))
  .show();

  const to = setTimeout(function () {
    vorpal.close();  // >>>  I want to programmatically close vorpal...but vorpal.close() is not a function
    process.stdin.end();
    log.error('No stdin was received after 25 seconds..closing...');
    p.killAllImmediately();
    process.exit(0);
  }, 25000);   // if no stdin has been received after 25 seconds

  process.stdin
  .setEncoding('utf8')
  .resume()
  .on('data', function customOnData(data: string) {
    clearTimeout(to);
    if (String(data) === 'q') {
      log.warning('killing all active workers.');
      p.killAllActiveWorkers();
    }
  });

【问题讨论】：

看起来在process.exit() 上，vorpal 会自行清理，但不完全确定

标签： javascript node.js vorpal.js inquirer vorpal

【解决方案1】：

虽然 Vorpal 没有关闭功能，但您可以使用 exec 或 execSync 以编程方式运行本机 exit 命令。您可能还对 hide 感兴趣，因为它只是隐藏了 Vorpal。

代码：

vorpal.exec("exit");

【讨论】：

谢谢，这是否比运行process.exit() 更好，你觉得呢？只是想确保东西得到正确清理。
@AlexanderMills 我猜是这样，但如果你只使用 Vorpal 和这个超时功能，可能只是轻微的。使用 Vorpal 命令似乎也更简洁。

【解决方案2】：

这是怎么回事？

const Vantage = require('vantage')

const v = Vantage()
    .delimiter('$test')
    .listen(9000)
    .show()

const close = () => {
    v.exec('exit', () => {
        console.log('DONE')
    })
}  
setTimeout(close, 1000)

Error: UI Prompt called when already mid prompt.
    at Object.prompt (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/ui.js:131:13)
    at Vorpal.vorpal.prompt (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal.js:450:8)
    at Vorpal.vorpal.exit (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal.js:1160:12)
    at Session.<anonymous> (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal-commons.js:49:19)
    at Vorpal.vorpal._exec (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal.js:846:18)
    at Vorpal.vorpal._execQueueItem (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal.js:594:10)
    at Vorpal.vorpal._queueHandler (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal.js:579:10)
    at Vorpal.vorpal.exec (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/node_modules/vorpal/lib/vorpal.js:554:24)
    at Timeout.close [as _onTimeout] (/Users/giggioz/Spaghetti/keeper/keeper-giochipiu-delegates/xxx.js:9:7)
    at ontimeout (timers.js:380:14)

【讨论】：