Add an HTTP client based on Curl.

pkg/http/lib/src/utils.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.
 
 library utils;
 
 import 'dart:crypto';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:scalarlist';
@@ skipping 165 matching lines @@
 /// The return values of all [Future]s are discarded. Any errors will cause the
 /// iteration to stop and will be piped through the return value.
 Future forEachFuture(Iterable input, Future fn(element)) {
   var iterator = input.iterator();
   Future nextElement(_) {
     if (!iterator.hasNext) return new Future.immediate(null);
     return fn(iterator.next()).chain(nextElement);
   }
   return nextElement(null);
 }
+
+/// Creates a temporary directory and passes its path to [fn]. Once the [Future]
+/// returned by [fn] completes, the temporary directory and all its contents
+/// will be deleted.

[Bob Nystrom, 2012/11/07 23:15:15]

Very nice.

+Future withTempDir(Future fn(String path)) {
+  var tempDir;
+  var future = new Directory('').createTemp().chain((dir) {
+    tempDir = dir;
+    return fn(tempDir.path);
+  });
+  future.onComplete((_) => tempDir.delete(recursive: true));
+  return future;
+}
+
+/// Configures [future] so that its result (success or exception) is passed on
+/// to [completer].
+void chainToCompleter(Future future, Completer completer) {
+  future.handleException((e) {
+    completer.completeException(e);
+    return true;
+  });
+  future.then(completer.complete);
+}