Added the continueParsing option to ArgParser.

pkg/args/lib/args.dart

Index: pkg/args/lib/args.dart
diff --git a/pkg/args/lib/args.dart b/pkg/args/lib/args.dart
index 9e6252a5a2b681ffba321741056ddd25183cc852..e9e39dbdb969db4903c9a0b56b73c03867514bc4 100644
--- a/pkg/args/lib/args.dart
+++ b/pkg/args/lib/args.dart
@@ -347,9 +347,20 @@ class ArgParser {
   /**
    * Parses [args], a list of command-line arguments, matches them against the
    * flags and options defined by this parser, and returns the result.
+   *
+   * If [parseAllOptions] is set, the parser will continue parsing even after it

[Bob Nystrom, 2013/06/20 00:33:36]

How about "allowTrailingOptions"?

[Andrei Mouravski, 2013/06/22 00:54:02]

Done.

+   * finds an argument that is neither an option nor a command. This allows
+   * options to be specified after command parameters.
+   *
+   * [parseAllOptions] is false by default, so when a non-option, non-command
+   * argument is encountered, it and any remaining arguments are passed to the
+   * leafmost command.

[Bob Nystrom, 2013/06/20 00:33:36]

"any remaining arguments are passed to the leafmost command" -> "all remaining
arguments, even ones that look like options, are not parsed".

[Andrei Mouravski, 2013/06/22 00:54:02]

Done.

+   *
+   * An argument that looks like an option, but does not match any option will
+   * throw a [FormatException], regardless of the value of [parseAllOptions].
    */
-  ArgResults parse(List<String> args) =>
-      new Parser(null, this, args.toList()).parse();
+  ArgResults parse(List<String> args, {bool parseAllOptions: false}) =>

[Bob Nystrom, 2013/06/20 00:33:36]

Instead of using a default here, initialize the default in the body:

if (parseAllOptions == null) parseAllOptions = false;

That handles the case where a user does parse(parseAllOptions: null)

[Andrei Mouravski, 2013/06/22 00:54:02]

Done.

+      new Parser(null, this, args.toList(), parseAllOptions).parse();
 
   /**
    * Generates a string displaying usage information for the defined options.