rails3.rb

  def assets_same_since?(old_assets_version = nil)
    return false if old_assets_version.nil? || old_assets_version.empty?
    return false if ENV['FORCE_ASSETS_COMPILATION']

    changed = %x(git diff #{old_assets_version}.. \
      vendor/assets/ \
      app/assets/ \
      config/javascript_translations.yml \
      config/javascript.yml | wc -l).chomp

    changed.to_i == 0
  end