class Bundler::Dsl

def source(source, options = {})
  @source = case source
  when :gemcutter, :rubygems, :rubyforge then Source::Rubygems.new("uri" => "http://gemcutter.org")
  when String then Source::Rubygems.new("uri" => source)
  else source
  end
  options[:prepend] ? @sources.unshift(@source) : @sources << @source
  yield if block_given?
  @source
ensure
  @source = nil
end