Added the continueParsing option to ArgParser.

pkg/args/lib/src/parser.dart

Index: pkg/args/lib/src/parser.dart
diff --git a/pkg/args/lib/src/parser.dart b/pkg/args/lib/src/parser.dart
index d35f9ea4aff1bb67a1c20034b17574168d0c6502..23a9d488f440b1efba0ea3ddd24072824e6b189d 100644
--- a/pkg/args/lib/src/parser.dart
+++ b/pkg/args/lib/src/parser.dart
@@ -42,9 +42,16 @@ class Parser {
   /** The current argument being parsed. */
   String get current => args[0];
 
-  /** Parses the arguments. This can only be called once. */
-  ArgResults parse() {
+  /**
+   * Parses the arguments. This can only be called once.
+   *
+   * If [continueParsing] is set, the parser will continue parsing even after it
+   * finds an argument that is not an option. This allows you to specify options
+   * after your command parameters.
+   */
+  ArgResults parse({continueParsing: false}) {
     var commandResults = null;
+    var rest = [];
 
     // Initialize flags to their defaults.
     grammar.options.forEach((name, option) {
@@ -79,8 +86,12 @@ class Parser {
       if (parseAbbreviation(this)) continue;
       if (parseLongOption()) continue;
 
-      // If we got here, the argument doesn't look like an option, so stop.
-      break;
+      if (!continueParsing) {
+        // If we got here, the argument doesn't look like an option, so stop.
+        break;
+      } else {
+        rest.add(args.removeAt(0));
+      }
     }
 
     // Set unspecified multivalued arguments to their default value,
@@ -95,7 +106,7 @@ class Parser {
     });
 
     // Add in the leftover arguments we didn't parse to the innermost command.
-    var rest = args.toList();
+    rest.addAll(args.toList());
     args.clear();
     return new ArgResults(results, commandName, commandResults, rest);
   }