Added SOURCE_ROOTS_KEY for compiler configuration.

compiler/cli/src/org/jetbrains/jet/cli/jvm/compiler/JetCoreEnvironment.java

@@ -28,6 +28,7 @@ import com.intellij.psi.PsiManager;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.asJava.JavaElementFinder;
 import org.jetbrains.jet.cli.jvm.JVMConfigurationKeys;
+import org.jetbrains.jet.config.CommonConfigurationKeys;
 import org.jetbrains.jet.config.CompilerConfiguration;
 import org.jetbrains.jet.lang.parsing.JetParser;
 import org.jetbrains.jet.lang.parsing.JetParserDefinition;
@@ -88,6 +89,9 @@ public class JetCoreEnvironment extends JavaCoreEnvironment {
         for (File path : configuration.getList(JVMConfigurationKeys.ANNOTATIONS_PATH_KEY)) {
             addExternalAnnotationsRoot(PathUtil.jarFileOrDirectoryToVirtualFile(path));
         }
+        for (String path : configuration.getList(CommonConfigurationKeys.SOURCE_ROOTS_KEY)) {
+            addSources(path);
+        }
 
         JetStandardLibrary.initialize(getProject());
     }

compiler/frontend/src/org/jetbrains/jet/config/CommonConfigurationKeys.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.config;
+
+import com.intellij.openapi.util.Key;
+
+import java.util.List;
+
+/**
+ * @author Evgeny Gerashchenko
+ * @since 7/9/12
+ */
+public class CommonConfigurationKeys {
+    public static final Key<List<String>> SOURCE_ROOTS_KEY = Key.create("source roots");
+
+}