gistfile1.rb

require 'tilt'

module Sprockets
  class RemoveFontFaceExceptTheFirstOne < Tilt::Template
    def prepare
    end

    def evaluate(context, locals, &block)
      found = false
      data.gsub(/^@font-face {[^}]*}/) do
        if found
          ''
        else
          found = true
          $&
        end
      end
    end
  end
  register_bundle_processor 'text/css', RemoveFontFaceExceptTheFirstOne
end