Change core lib, dart2js, and more for new optional parameters syntax

utils/pub/io.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.
 
 /**
  * Helper functionality to make working with IO easier.
  */
 library io;
 
 import 'dart:io';
@@ skipping 463 matching lines @@
 /**
  * Spawns and runs the process located at [executable], passing in [args].
  * Returns a [Future] that will complete the results of the process after it
  * has ended.
  *
  * If [pipeStdout] and/or [pipeStderr] are set, all output from the subprocess's
  * output streams are sent to the parent process's output streams. Output from
  * piped streams won't be available in the result object.
  */
 Future<PubProcessResult> runProcess(String executable, List<String> args,
-    [workingDir, Map<String, String> environment, bool pipeStdout = false,
-    bool pipeStderr = false]) {
+    {workingDir, Map<String, String> environment, bool pipeStdout: false,
+    bool pipeStderr: false}) {
   int exitCode;
 
   // TODO(rnystrom): Should dart:io just handle this?
   // Spawning a process on Windows will not look for the executable in the
   // system path. So, if executable looks like it needs that (i.e. it doesn't
   // have any path separators in it), then spawn it through a shell.
   if ((Platform.operatingSystem == "windows") &&
       (executable.indexOf('\\') == -1)) {
     args = flatten(["/c", executable, args]);
     executable = "cmd";
@@ skipping 53 matching lines @@
   if (_isGitInstalledCache != null) {
     // TODO(rnystrom): The sleep is to pump the message queue. Can use
     // Future.immediate() when #3356 is fixed.
     return sleep(0).transform((_) => _isGitInstalledCache);
   }
 
   return _gitCommand.transform((git) => git != null);
 }
 
 /// Run a git process with [args] from [workingDir].
-Future<PubProcessResult> runGit(List<String> args, [String workingDir]) =>
-    _gitCommand.chain((git) => runProcess(git, args, workingDir));
+Future<PubProcessResult> runGit(List<String> args, {String workingDir}) =>
+    _gitCommand.chain((git) => runProcess(git, args, workingDir: workingDir));
 
 /// Returns the name of the git command-line app, or null if Git could not be
 /// found on the user's PATH.
 Future<String> get _gitCommand {
   // TODO(nweiz): Just use Future.immediate once issue 3356 is fixed.
   if (_gitCommandCache != null) {
     return sleep(0).transform((_) => _gitCommandCache);
   }
 
   return _tryGitCommand("git").chain((success) {
@@ skipping 184 matching lines @@
   return new Directory(entry);
 }
 
 /**
  * Gets a [Uri] for [uri], which can either already be one, or be a [String].
  */
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }