old_contents: #! /usr/bin/env node
  
  var userArguments = process.argv.slice(2); // copies arguments list but removes first two options (script exec type & exec location)
  
  if (userArguments.length > 1) {
      throw new Error('Only one argument should be specified (the url you want to generate the appcache for)');
  }
  
  var fs               = require('fs');
  var shell            = require('child_process').execFile;
  var phantomjs        = require('phantomjs').path;
  var scriptToExecute  = __dirname + '/appcache.js';
  var manifest         = __dirname + '/../appcache.manifest';
  var url              = userArguments[0];
  var manifestContent;
  var data;
  
  fs.readFile(manifest, bootstrap);
  
  function bootstrap(err, contentAsBuffer) {
      manifestContent = contentAsBuffer.toString('utf8');
  
      shell(phantomjs, [scriptToExecute, url, manifestContent], function(err, stdout, stderr) {
          if (err) throw err;
  
          // Sometimes an error in the loaded page's JavaScript doesn't get picked up or thrown?
          // But the error comes in via stdout and causes JSON parsing to break
          try {
              data = JSON.parse(stdout);
          } catch(err) {
              log('Whoops! Seems there was an error? You\'ll find the stack trace below.');
              error(err);
          }
  
          displayStatistics();
          createManifestFile();
      });
  }
  
  function displayStatistics() {
      log(''); // adds extra line of spacing when displaying the results
      log('Links: '      + data.links);
      log('Images: '     + data.images);
      log('CSS: '        + data.css);
      log('JavaScript: ' + data.javascript);
  }
  
  function createManifestFile() {
      fs.writeFile(process.cwd() + '/appcache.manifest', data.manifestContent, function(err) {
          if (err) throw err;
  
          log('\nManifest file created');
      });
  }
  
  function log(message) {
      process.stdout.write(message + '\n');
  }
  
  function error(err) {
      process.stderr.write(err);
  }
  
new_contents: #! /usr/bin/env node
  
  var userArguments = process.argv.slice(2); // copies arguments list but removes first two options (script exec type & exec location)
  
  if (userArguments.length > 1) {
      throw new Error('Only one argument should be specified (the url you want to generate the appcache for)');
  }
  
  var fs               = require('fs');
  var shell            = require('child_process').execFile;
  var phantomjs        = require('phantomjs').path;
  var scriptToExecute  = __dirname + '/appcache.js';
  var manifest         = __dirname + '/../appcache.manifest';
  var url              = userArguments[0];
  var manifestContent;
  var data;
  
  fs.readFile(manifest, bootstrap);
  
  function bootstrap(err, contentAsBuffer) {
      if (err) throw err;
  
      manifestContent = contentAsBuffer.toString('utf8');
  
      shell(phantomjs, [scriptToExecute, url, manifestContent], function(err, stdout, stderr) {
          if (err) throw err;
  
          // Sometimes an error in the loaded page's JavaScript doesn't get picked up or thrown?
          // But the error comes in via stdout and causes JSON parsing to break
          try {
              data = JSON.parse(stdout);
          } catch(err) {
              log('Whoops! Seems there was an error? You\'ll find the stack trace below.');
              error(err);
          }
  
          displayStatistics();
          createManifestFile();
      });
  }
  
  function displayStatistics() {
      log(''); // adds extra line of spacing when displaying the results
      log('Links: '      + data.links);
      log('Images: '     + data.images);
      log('CSS: '        + data.css);
      log('JavaScript: ' + data.javascript);
  }
  
  function createManifestFile() {
      fs.writeFile(process.cwd() + '/appcache.manifest', data.manifestContent, function(err) {
          if (err) throw err;
  
          log('\nManifest file created');
      });
  }
  
  function log(message) {
      process.stdout.write(message + '\n');
  }
  
  function error(err) {
      process.stderr.write(err);
  }
  
subject: Throw error