Frog changes (in experimental) to get frog integrated into the test infrastructure.

options.dart

Index: options.dart
===================================================================
--- options.dart	(revision 1140)
+++ options.dart	(working copy)
@@ -6,9 +6,9 @@
 Options options;
 
 /** Extracts options from command-line arguments. */
-void parseOptions(String homedir, List<String> args) {
+void parseOptions(String homedir, List<String> args, FileSystem files) {
   assert(options == null);
-  options = new Options(homedir, args);
+  options = new Options(homedir, args, files);
 }
 
 // TODO(sigmund): make into a generic option parser...
@@ -44,9 +44,11 @@
    */
   List<String> childArgs;
 
-  Options(String homedir, List<String> args) {
+  Options(String homedir, List<String> args, FileSystem files) {
     libDir = homedir + '/lib'; // Default value for --libdir.
     bool ignoreUnrecognizedFlags = false;
+    bool passedLibDir = false;
+    childArgs = [];
 
     // Start from 2 to skip arguments representing the compiler command
     // (node/python followed by frogsh/frog.py).
@@ -106,11 +108,12 @@
           if (arg.endsWith('.dart')) {
             dartScript = arg;
             childArgs = args.getRange(i + 1, args.length - i - 1);
-            return;
+            break loop;
           } else if (arg.startsWith('--out=')) {
             outfile = arg.substring('--out='.length);
           } else if (arg.startsWith('--libdir=')) {
             libDir = arg.substring('--libdir='.length);
+            passedLibDir = true;
           } else {
             if (!ignoreUnrecognizedFlags) {
               print('unrecognized flag: "$arg"');
@@ -118,6 +121,15 @@
           }
       }
     }
-    childArgs = [];
+
+    if (!passedLibDir && !files.fileExists(libDir)) {
+      // Try locally
+      var temp = 'frog/lib';
+      if (files.fileExists(temp)) {
+        libDir = temp;
+      } else {
+        libDir = 'lib';
+      }
+    }
   }
 }