Add Directory.createTemp() to asynchronously create a temporary directory.

runtime/bin/directory_impl.dart

Index: runtime/bin/directory_impl.dart
diff --git a/runtime/bin/directory_impl.dart b/runtime/bin/directory_impl.dart
index 485dfadfcac5e6b83b22824b6f9ee4ff70552399..2644005e0cee3beae1a697c5d199c510decf2248 100644
--- a/runtime/bin/directory_impl.dart
+++ b/runtime/bin/directory_impl.dart
@@ -29,6 +29,26 @@ class _DirectoryListingIsolate extends Isolate {
 }
 
 
+class _DirectoryCreateTempIsolate extends Isolate {
+
+  _DirectoryCreateTempIsolate() : super.heavy();
+
+  void main() {
+    port.receive((path, replyTo) {
+      if (path == '') path = '/tmp/darttmpdirXXXXXX';

[Mads Ager (google), 2011/11/18 09:50:45]

You should add a comment about this default behavior in the interface.

[Bill Hesse, 2011/11/21 15:48:41]

Moved to .cc file.

+
+      // Call function to get file name
+      String result = _createTemp(path);
+      var message = {'success': (result != ''), 'directoryName': result};

[Mads Ager (google), 2011/11/18 09:50:45]

Do this in the caller? Just do replyTo.send(_createTemp(path))?

[Bill Hesse, 2011/11/21 15:48:41]

Done.

+      replyTo.send(message);
+      port.close();
+    });
+  }
+
+  String _createTemp(String template) native "Directory_CreateTemp";
+}
+
+
 class _Directory implements Directory {
 
   _Directory(String this._path);
@@ -47,6 +67,24 @@ class _Directory implements Directory {
     }
   }
 
+  void createTemp(void createdHandler(Directory tempDir)) {
+    new _DirectoryCreateTempIsolate().spawn().then((port) {
+      port.call(_path).receive((result, ignored) {
+        if (result['success']) {
+          // Create new Directory with returned file name.
+          Directory tempDir = new Directory(result['directoryName']);
+          tempDir.dirHandler = _dirHandler;

[Mads Ager (google), 2011/11/18 09:50:45]

This is subtle, why do you transfer the handlers? I think this is another
argument that what we really want is to modify the current Directory object.

[Bill Hesse, 2011/11/21 15:48:41]

All this is removed, and we do not create a new Directory object.

On 2011/11/18 09:50:45, Mads Ager wrote:

+          tempDir.fileHandler = _fileHandler;
+          tempDir.doneHandler = _doneHandler;
+          tempDir.errorHandler = _errorHandler;
+          createdHandler(tempDir);
+        } else {
+          // Report error
+        }
+      });
+    });
+  }
+
   void deleteSync() {
     if (!_delete(_path)) {
       throw new DirectoryException("Directory deletion failed: $_path");