class Rails::Engine::Configuration

config.generators.colorize_logging = false

If you want to disable color in console, do:

end
g.test_framework :rspec
g.template_engine :haml
g.orm :data_mapper, migration: true
config.generators do |g|

Holds generators configuration:

def generators
  @generators ||= Rails::Configuration::Generators.new
  yield(@generators) if block_given?
  @generators
end