Switch pkg packages, pub, and dartdoc to use package: imports.

utils/pub/io.dart

Index: utils/pub/io.dart
diff --git a/utils/pub/io.dart b/utils/pub/io.dart
index f4bb6de9e243da207bf8cd92126f792fea4efc90..fbeed38b347dc96772d4384730a855bbfe92ff02 100644
--- a/utils/pub/io.dart
+++ b/utils/pub/io.dart
@@ -11,14 +11,14 @@ import 'dart:isolate';
 import 'dart:json';
 import 'dart:uri';
 
-import '../../pkg/pathos/lib/path.dart' as path;
-import '../../pkg/http/lib/http.dart' show ByteStream;
+import 'package:pathos/path.dart' as path;
+import 'package:http/http.dart' show ByteStream;
 import 'error_group.dart';
 import 'exit_codes.dart' as exit_codes;
 import 'log.dart' as log;
 import 'utils.dart';
 
-export '../../pkg/http/lib/http.dart' show ByteStream;
+export 'package:http/http.dart' show ByteStream;
 
 /// Returns whether or not [entry] is nested somewhere within [dir]. This just
 /// performs a path comparison; it doesn't look at the actual filesystem.
@@ -310,6 +310,22 @@ String relativeToPub(String target) {
   return path.normalize(path.join(utilDir, 'pub', target));
 }
 
+/// Whether pub is running from within the Dart SDK, as opposed to from the Dart
+/// source repository.
+bool get runningFromSdk => path.dirname(relativeToPub('..')) == 'util';

[Bob Nystrom, 2013/03/26 01:55:44]

Does pub itself need these or are they just for tests? If for tests, let's move
it into test_pub.dart.

[nweiz, 2013/03/26 02:09:53]

Done.

+
+// TODO(nweiz): use the built-in mechanism for accessing this once it exists
+// (issue 9119).
+/// The path to the `packages` directory from which pub loads its dependencies.
+String get packageRoot {
+  if (runningFromSdk) {
+    return path.absolute(relativeToPub(path.join('..', '..', 'packages')));
+  } else {
+    return path.absolute(path.join(
+        path.dirname(new Options().executable), '..', '..', 'packages'));
+  }
+}
+
 // TODO(nweiz): add a ByteSink wrapper to make writing strings to stdout/stderr
 // nicer.