minor refactoring to allow plugins to be added to the BytecodeCompiler

compiler/cli/src/org/jetbrains/jet/cli/KDocLoader.java

@@ -83,4 +83,18 @@ public class KDocLoader {
             }
         }
     }
+
+    /**
+     * Installs the KDoc compiler plugin if it can be created
+     */
+    public static boolean install(String docOutputDir, JetCoreEnvironment environment) {
+        KDocLoader loader = new KDocLoader(docOutputDir);
+        CompilerPlugin processor = loader.createCompilerPlugin();
+        if (processor != null) {
+            environment.getCompilerPlugins().add(processor);
+            return true;
+        } else {
+            return false;
+        }
+    }
 }

compiler/cli/src/org/jetbrains/jet/cli/KotlinCompiler.java

@@ -132,11 +132,7 @@ public class KotlinCompiler {
             environment.setStubs(arguments.stubs);
 
             if (arguments.docOutputDir != null) {
-                KDocLoader factory = new KDocLoader(arguments.docOutputDir);
-                CompilerPlugin processor = factory.createCompilerPlugin();
-                if (processor != null) {
-                    environment.getMyEnvironment().getCompilerPlugins().add(processor);
-                }
+                KDocLoader.install(arguments.docOutputDir, environment.getMyEnvironment());
             }
 
             if (arguments.stdlib != null) {