old_contents: #!/usr/bin/env node
  console.log("Starting bert. Type 'exit' when you're done.")
  // TODO: run file watcher
  
  // TODO: add command line option to specify logs location
  let logDir = resolveHome('~/.bert/');
  
  // create the log directory if it doesn't already exist
  createDirectory(logDir);
  
  // start `script`
  var spawn = require('child_process').spawn;
  // we won't intercept the output to avoid causing user disruption
  spawn('script', ['-q', '-F', logDir + generateNewLogName()], { stdio: 'inherit' });
  
  // generate new log to avoid name conflicts
  function generateNewLogName() {
      // TODO: check directory and add increment for each new session
      return 'log';
  }
  
  function createDirectory(dir) {
      const fs = require('fs');
      if (!fs.existsSync(dir)){
          fs.mkdirSync(dir);
      }
  }
  
  // resolve ~ as the user's home directory
  function resolveHome(filepath) {
      const path = require('path');
      if (filepath[0] === '~') {
          return path.join(process.env.HOME, filepath.slice(1));
      }
      return filepath;
  }
  
new_contents: #!/usr/bin/env node
  "use strict";
  
  console.log("Starting bert. Type 'exit' when you're done.")
  // TODO: run file watcher
  
  // TODO: add command line option to specify logs location
  let logDir = resolveHome('~/.bert/');
  
  // create the log directory if it doesn't already exist
  createDirectory(logDir);
  
  // start `script`
  var spawn = require('child_process').spawn;
  // we won't intercept the output to avoid causing user disruption
  spawn('script', ['-q', '-F', logDir + generateNewLogName()], { stdio: 'inherit' });
  
  // generate new log to avoid name conflicts
  function generateNewLogName() {
      // TODO: check directory and add increment for each new session
      return 'log';
  }
  
  function createDirectory(dir) {
      const fs = require('fs');
      if (!fs.existsSync(dir)){
          fs.mkdirSync(dir);
      }
  }
  
  // resolve ~ as the user's home directory
  function resolveHome(filepath) {
      const path = require('path');
      if (filepath[0] === '~') {
          return path.join(process.env.HOME, filepath.slice(1));
      }
      return filepath;
  }
  
subject: Enable strict mode for Node