REPL tools for NodeJS

irjs.js

#!/usr/bin/env node

// boot node repl with a few libraries auto-loaded and some top-level convenience functions
(function () {
  "use strict";

  var repl = require("repl");
  var context = repl.start("irjs> ").context;
  var path = require('path');
  var fs = require('fs');
  
  // http://stackoverflow.com/questions/9080085/node-js-find-home-directory-in-platform-agnostic-way
  var getUserHome = () => process.env[/^win/.test(process.platform) ? 'USERPROFILE' : 'HOME'];

  var nodercPath = path.join(getUserHome(), '.noderc.js');

  var libs = {
    async:  require('async'),
    l_:     require('lodash'), // l_ used since repl already uses _ for previous output
    lodash: require('lodash'),
    moment: require('moment')
  };

  var helpers = {
    exit: () => process.exit(1),
    pwd: () => process.argv[1].split(/\/[^\/]*$/).join('')
  };

  // merge lib namespaces & helper functions into repl context.
  // each key in both helpers and libs becomes a top-level var in the repl.
  var mergeIntoContext = (objToMerge) => {
    Object.keys(objToMerge).forEach((key) => context[key] = objToMerge[key]);
  };
  mergeIntoContext(libs);
  mergeIntoContext(helpers);

  // try to load in all functions defined in .noderc file
  if (!fs.existsSync(nodercPath)) {
    if (process.argv.find((item) => item === '--debug')) {
      console.log(`noderc not found at ${nodercPath}`);
    }
    return;
  }
  try {
    mergeIntoContext(require(nodercPath));
  } catch(e) {
    console.error("Failed to load noderc file, at: '" + nodercPath + "'");
  }
}());