Dartdoc supports package directory.

pkg/dartdoc/lib/dartdoc.dart

Index: pkg/dartdoc/lib/dartdoc.dart
diff --git a/pkg/dartdoc/lib/dartdoc.dart b/pkg/dartdoc/lib/dartdoc.dart
index c5ed628630f468ed5ceb411d485c71e697b9ba47..6bdf0488c88087fd409e69d6d365bcbd175af4b8 100644
--- a/pkg/dartdoc/lib/dartdoc.dart
+++ b/pkg/dartdoc/lib/dartdoc.dart
@@ -307,13 +307,13 @@ class Dartdoc {
     return content;
   }
 
-  void documentEntryPoint(Path entrypoint, Path libPath) {
-    final compilation = new Compilation(entrypoint, libPath);
+  void documentEntryPoint(Path entrypoint, Path libPath, Path pkgPath) {
+    final compilation = new Compilation(entrypoint, libPath, pkgPath);
     _document(compilation);
   }
 
-  void documentLibraries(List<Path> libraryList, Path libPath) {
-    final compilation = new Compilation.library(libraryList, libPath);
+  void documentLibraries(List<Path> libraryList, Path libPath, Path pkgPath) {
+    final compilation = new Compilation.library(libraryList, libPath, pkgPath);
     _document(compilation);
   }