class Jekyll::LogAdapter

def message(topic, message = nil)

Returns the formatted message

message - the message detail
topic - the topic of the message, e.g. "Configuration file", "Deprecation", etc.

Internal: Build a topic method 
def message(topic, message = nil)
  raise ArgumentError, "block or message, not both" if block_given? && message
  message = yield if block_given?
  message = message.to_s.gsub(%r!\s+!, " ")
  topic = formatted_topic(topic, block_given?)
  out = topic + message
  messages << out
  out
end