Add an ArgResults.original getter.

pkg/args/lib/src/parser.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library args.src.parser;
 
 import 'arg_parser.dart';
 import 'arg_results.dart';
 import 'option.dart';
 
@@ skipping 28 matching lines @@
 
   Parser(this.commandName, this.grammar, this.args, this.parent, rest) {
     if (rest != null) this.rest.addAll(rest);
   }
 
   /// The current argument being parsed.
   String get current => args[0];
 
   /// Parses the arguments. This can only be called once.
   ArgResults parse() {
+    var original = args.toList();
     var commandResults = null;
 
     // Parse the args.
     while (args.length > 0) {
       if (current == '--') {
         // Reached the argument terminator, so stop here.
         args.removeAt(0);
         break;
       }
 
@@ skipping 25 matching lines @@
 
     // Invoke the callbacks.
     grammar.options.forEach((name, option) {
       if (option.callback == null) return;
       option.callback(option.getOrDefault(results[name]));
     });
 
     // Add in the leftover arguments we didn't parse to the innermost command.
     rest.addAll(args);
     args.clear();
-    return newArgResults(grammar, results, commandName, commandResults, rest);
+    return newArgResults(grammar, results, commandName, commandResults, rest,
+        original);
   }
 
   /// Pulls the value for [option] from the second argument in [args].
   ///
   /// Validates that there is a valid value there.
   void readNextArgAsValue(Option option) {
     // Take the option argument from the next command line arg.
     validate(args.length > 0,
         'Missing argument for "${option.name}".');
 
@@ skipping 155 matching lines @@
     }
 
     if (option.isMultiple) {
       var list = results.putIfAbsent(option.name, () => []);
       list.add(value);
     } else {
       results[option.name] = value;
     }
   }
 }