Currently register looks like:

   private static <T> void register(Map<T, T> substitutions, T annotated, T original, T target) {
        if (annotated != null) {
            guarantee(!substitutions.containsKey(annotated) || substitutions.get(annotated) == original || substitutions.get(annotated) == target, "Already registered: %s", annotated);
            substitutions.put(annotated,

Add a proper function and add the sorting code in the function.

User if __name__ == '__main__': and write a few lines of code with a simple example.

When generating a new project providing an openapi.yaml file the resulted project is carrying a file converted to json format.