skypager-repl/dist/extensions/promise.js

an awesome repl

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _typeof2 = require('babel-runtime/helpers/typeof');

var _typeof3 = _interopRequireDefault(_typeof2);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

exports.default = function (repl, evalFn) {
  var realEval = evalFn || repl.eval;

  var promiseEval = function promiseEval(cmd, context, filename, callback) {
    realEval.call(repl, cmd, context, filename, function (err, res) {
      // Error response
      if (err) {
        return callback(err);
      }

      if (res && typeof res.value === 'function' && res.constructor.name === 'LodashWrapper') {
        return callback(null, res.value());
      }

      if (!res || typeof res.then != 'function' || typeof res.then === 'function' && (0, _typeof3.default)(res.context) === 'object') {
        return callback(null, res);
      }

      var cancel = function cancel(chunk, key) {
        repl.outputStream.write('break.\n');
        if (key.name === 'escape') {
          process.stdin.removeListener('keypress', cancel);
          callback(null, res);
          callback = function callback() {};
        }
      };

      process.stdin.on('keypress', cancel);

      // Start a timer indicating that escape can be used to quit
      var hangTimer = setTimeout(function () {
        repl.outputStream.write('Hit escape to stop waiting on promise\n');
      }, 5000);

      res.then(function (val) {
        process.stdin.removeListener('keypress', cancel);
        clearTimeout(hangTimer);
        callback(null, val);
      }, function (err) {
        process.stdin.removeListener('keypress', cancel);
        clearTimeout(hangTimer);
        repl.outputStream.write('Promise rejected: ');
        callback(err);
      }).then(null, function (uncaught) {
        // Rethrow uncaught exceptions
        process.nextTick(function () {
          throw uncaught;
        });
      });
    });
  };

  repl.eval = promiseEval;

  repl.commands['promise'] = {
    help: 'Toggle auto-promise unwrapping',
    action: function action() {
      if (repl.eval === promiseEval) {
        this.outputStream.write('Promise auto-eval disabled\n');
        repl.eval = realEval;
      } else {
        this.outputStream.write('Promise auto-eval enabled\n');
        repl.eval = promiseEval;
      }
      this.displayPrompt();
    }
  };
};
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