Add a pub validator for compiled dartdoc output.

utils/pub/validator/compiled_dartdoc.dart

Index: utils/pub/validator/compiled_dartdoc.dart
diff --git a/utils/pub/validator/compiled_dartdoc.dart b/utils/pub/validator/compiled_dartdoc.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c2c93f3a8708610624d1abdfce09a95813c4ce47
--- /dev/null
+++ b/utils/pub/validator/compiled_dartdoc.dart
@@ -0,0 +1,47 @@
+// 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 compiled_dartdoc_validator;
+
+import 'dart:async';
+
+import '../../../pkg/path/lib/path.dart' as path;
+
+import '../entrypoint.dart';
+import '../io.dart';
+import '../utils.dart';
+import '../validator.dart';
+
+/// Validates that a package doesn't contain compiled Dartdoc
+/// output.
+class CompiledDartdocValidator extends Validator {
+  CompiledDartdocValidator(Entrypoint entrypoint)
+    : super(entrypoint);
+
+  Future validate() {
+    return listDir(entrypoint.root.dir, recursive: true).then((entries) {
+      return futureWhere(entries, (entry) {
+        if (basename(entry) != "nav.json") return false;
+        var dir = dirname(entry);
+
+        // Look for tell-tale Dartdoc output files all in the same directory.
+        return Future.wait([
+          fileExists(entry),
+          fileExists(join(dir, "index.html")),
+          fileExists(join(dir, "styles.css")),
+          fileExists(join(dir, "dart-logo-small.png")),
+          fileExists(join(dir, "client-live-nav.js"))
+        ]).then((results) => results.every((val) => val));
+      }).then((files) {
+        for (var dartdocDir in files.mappedBy(dirname)) {
+          var relativePath = path.relative(dartdocDir);
+          warnings.add("Avoid putting generated documentation in "
+                  "$relativePath.\n"
+              "Generated documentation bloats the package with redundant "
+                  "data.");
+        }
+      });
+    });
+  }
+}