module RSpec

  class << self
    def deprecate(method, alternate_method=nil, version=nil)
      version_string = version ? "rspec-#{version}" : "a future version of RSpec"

      message = <<-NOTICE

*****************************************************************
DEPRECATION WARNING: you are using deprecated behaviour that will
be removed from #{version_string}.

#{caller(0)[2]}

* #{method} is deprecated.
NOTICE
      if alternate_method
        message << <<-ADDITIONAL
* please use #{alternate_method} instead.
ADDITIONAL
      end

      message << "*****************************************************************"
      warn_deprecation(message)
    end

    def warn_deprecation(message)
      send :warn, message
    end
  end

  class HashWithDeprecationNotice < Hash

    def initialize(method, alternate_method=nil)
      @method, @alternate_method = method, alternate_method
    end

    def []=(k,v)
      RSpec.deprecate(@method, @alternate_method)
      super(k,v)
    end

  end

end