Add the ability to change the working directory

pkg/pathos/lib/path.dart

 // Copyright (c) 2012, 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.
 
 /// A comprehensive, cross-platform path manipulation library.
 ///
 /// ## Installing ##
 ///
 /// Use [pub][] to install this package. Add the following to your
 /// `pubspec.yaml` file.
@@ skipping 22 matching lines @@
  */
 void _growListFront(List list, int length, fillValue) {
   list.length += length;
   list.setRange(length, list.length, list);
   for (var i = 0; i < length; i++) {
     list[i] = fillValue;
   }
 }
 
 /// Gets the path to the current working directory.
-String get current => new io.Directory.current().path;
+String get current => io.Directory.current.path;
 
 /// Gets the path separator for the current platform. On Mac and Linux, this
 /// is `/`. On Windows, it's `\`.
 String get separator => _builder.separator;
 
 /// Converts [path] to an absolute path by resolving it relative to the current
 /// working directory. If [path] is already an absolute path, just returns it.
 ///
 ///     path.absolute('foo/bar.txt'); // -> /your/current/dir/foo/bar.txt
 String absolute(String path) => join(current, path);
@@ skipping 699 matching lines @@
     // If there is no dot, or it's the first character, like '.bashrc', it
     // doesn't count.
     if (lastDot <= 0) return [file, ''];
 
     return [file.substring(0, lastDot), file.substring(lastDot)];
   }
 
   _ParsedPath clone() => new _ParsedPath(
       style, root, new List.from(parts), new List.from(separators));
 }