Creating executable rails 3 generators

For inspiration I have been looking into rails 3.0pre

I found this in the file *bin/rails*

It almost works... except I run into the following issue

module Nifty
  module Generators
    class ScaffoldGenerator < Base
...
      def initialize(*args, &block)
        super

        args_for_c_m.each do |arg|
          if arg == '!'
            options[:invert] = true <<<<<< line 53
...
        if @model_attributes.empty?
          options[:skip_model] = true <<<<<<<<

end