added a mechanism to redirect help file

core/src/main/java/hudson/model/Descriptor.java

@@ -195,6 +195,13 @@ public abstract class Descriptor<T extends Describable<T>> implements Saveable {
         }
     }
 
+    /**
+     * Help file redirect, keyed by the field name to the path.
+     *
+     * @see #getHelpFile(String) 
+     */
+    private final Map<String,String> helpRedirect = new HashMap<String, String>();
+
     /**
      *
      * @param clazz
@@ -595,6 +602,9 @@ public abstract class Descriptor<T extends Describable<T>> implements Saveable {
      * locale variations.
      */
     public String getHelpFile(final String fieldName) {
+        String v = helpRedirect.get(fieldName);
+        if (v!=null)    return v;
+
         for(Class c=clazz; c!=null; c=c.getSuperclass()) {
             String page = "/descriptor/" + getId() + "/help";
             String suffix;
@@ -619,6 +629,15 @@ public abstract class Descriptor<T extends Describable<T>> implements Saveable {
         return null;
     }
 
+    /**
+     * Tells Jenkins that the help file for the field 'fieldName' is defined in the help file for
+     * the 'fieldNameToRedirectTo' in the 'owner' class.
+     */
+    protected void addHelpFileRedirect(String fieldName, Class<? extends Describable> owner, String fieldNameToRedirectTo) {
+        helpRedirect.put(fieldName,
+            Jenkins.getInstance().getDescriptor(owner).getHelpFile(fieldNameToRedirectTo));
+    }
+
     /**
      * Checks if the given object is created from this {@link Descriptor}.
      */