gistfile1.rb

class Object
  TEST_FORMATTER_FILE_REGEX = /_formatter/ unless defined?(TEST_FORMATTER_FILE_REGEX)

  alias :original_puts :puts
  def puts(string ="")
    if caller.first =~ TEST_FORMATTER_FILE_REGEX
      super string
    else
      super string.to_s + "\s(#{caller.first.match(/(\w+\.\w+:\d+)|Rakefile:\d+/)[0]})"
    end
  end

  def p(string="")
    if caller.first =~ TEST_FORMATTER_FILE_REGEX
      original_puts string
    else
      original_puts "\s(#{caller.first.match(/(\w+\.\w+:\d+)|Rakefile:\d+/)[0]})"
    end
    super(string)
  end

  def print(string="")
    if caller.first =~ TEST_FORMATTER_FILE_REGEX
      super string
    else
      super string + "\s(#{caller.first.match(/(\w+\.\w+:\d+)|Rakefile:\d+/)[0]})"
    end
  end

end

def pre(message)
  original_puts '<pre>' + CGI.escapeHTML(message.to_s) + '</pre>'
end