- Add getters for the current packageRoot or packageMap.

pkg/docgen/lib/src/generator.dart

Index: pkg/docgen/lib/src/generator.dart
diff --git a/pkg/docgen/lib/src/generator.dart b/pkg/docgen/lib/src/generator.dart
index 18ed895ec673f1276e862ca580e03f3dffb59538..2d5c6e1529c3fd025db49a929f9b5419d54f9faf 100644
--- a/pkg/docgen/lib/src/generator.dart
+++ b/pkg/docgen/lib/src/generator.dart
@@ -266,7 +266,7 @@ void _ensureOutputDirectory(String outputDirectory) {
 /// Analyzes set of libraries and provides a mirror system which can be used
 /// for static inspection of the source code.
 Future<MirrorSystem> analyzeLibraries(List<Uri> libraries, String
-    libraryRoot, {String packageRoot}) {
+    libraryRoot, {String packageRoot}) async {
   SourceFileProvider provider = new CompilerSourceFileProvider();
   api.DiagnosticHandler diagnosticHandler = new FormattingDiagnosticHandler(
       provider)
@@ -274,20 +274,23 @@ Future<MirrorSystem> analyzeLibraries(List<Uri> libraries, String
       ..showWarnings = false;
   Uri libraryUri = new Uri.file(appendSlash(libraryRoot));
   Uri packageUri = null;
-  if (packageRoot == null) {
-    packageRoot = Platform.packageRoot;
+  if (packageRoot != null) {
+    packageUri = new Uri.file(appendSlash(packageRoot));
+  } else {
+    packageUri = await Platform.packageRoot;
   }
-  packageUri = new Uri.file(appendSlash(packageRoot));
-  return dart2js.analyze(libraries, libraryUri, packageUri,
+  try {
+    return await dart2js.analyze(libraries, libraryUri, packageUri,
       provider.readStringFromUri, diagnosticHandler, ['--preserve-comments',
-      '--categories=Client,Server'])..catchError((error) {
-        logger.severe('Error: Failed to create mirror system. ');
-        // TODO(janicejl): Use the stack trace package when bug is resolved.
-        // Currently, a string is thrown when it fails to create a mirror
-        // system, and it is not possible to use the stack trace. BUG(#11622)
-        // To avoid printing the stack trace.
-        exit(1);
-      });
+      '--categories=Client,Server']);
+  } catch (error) {
+    logger.severe('Error: Failed to create mirror system. ');
+    // TODO(janicejl): Use the stack trace package when bug is resolved.
+    // Currently, a string is thrown when it fails to create a mirror
+    // system, and it is not possible to use the stack trace. BUG(#11622)
+    // To avoid printing the stack trace.
+    exit(1);
+  }
 }
 
 /// For this run of docgen, determine the packageRoot value.