module Thor::Actions

end
" filter_parameter :password\n"
inject_into_class "app/controllers/application_controller.rb", ApplicationController do

inject_into_class "app/controllers/application_controller.rb", ApplicationController, " filter_parameter :password\n"

==== Examples

config:: give :verbose => false to not log the status.
data:: the data to append to the class, can be also given as a block.
klass:: the class to be manipulated
path:: path of the file to be changed
==== Parameters

insert_into_file, it's reversible.
Injects text right after the class definition. Since it depends on

def inject_into_class(path, klass, *args, &block)
  config = args.last.is_a?(Hash) ? args.pop : {}
  config[:after] = /class #{klass}\n|class #{klass} .*\n/
  insert_into_file(path, *(args << config), &block)
end