module Rails::Generators::Actions

def environment(data=nil, options={}, &block)


file in config/environments.
If options :env is specified, the line is appended to the corresponding

Adds a line inside the Application class for config/application.rb. 
def environment(data=nil, options={}, &block)
  sentinel = /class [a-z_:]+ < Rails::Application/i
  data = block.call if !data && block_given?
  in_root do
    if options[:env].nil?
      inject_into_file 'config/application.rb', "\n  #{data}", :after => sentinel, :verbose => false
    else
      Array.wrap(options[:env]).each do|env|
        append_file "config/environments/#{env}.rb", "\n#{data}", :verbose => false
      end
    end
  end
end