New and Improved Logger for Rails

buffered_logger.rb

# config/initializers/buffered_logger.rb

module ActiveSupport
  # Format the buffered logger with timestamp/severity info.
  class BufferedLogger
    NUMBER_TO_NAME_MAP  = {0=>'DEBUG', 1=>'INFO', 2=>'WARN', 3=>'ERROR', 4=>'FATAL', 5=>'UNKNOWN'}
    NUMBER_TO_COLOR_MAP = {0=>'0;37', 1=>'32', 2=>'33', 3=>'31', 4=>'31', 5=>'37'}
    # http://api.rubyonrails.org/classes/Time.html#method-i-2D
    DATE_FORMATTER = {0 => :db, 1 => :short, 2 => :long, 3 => :time}

    def add(severity, message = nil, progname = nil, &block)
      return if @level > severity
      sevstring = NUMBER_TO_NAME_MAP[severity]
      color     = NUMBER_TO_COLOR_MAP[severity]

      message = (message || (block && block.call) || progname).to_s
      message = "\033[0;37m#{Time.now.to_s(DATE_FORMATTER[3])}\033[0m [\033[#{color}m" + sprintf("%-5s","#{sevstring}") + "\033[0m] #{message.strip} (pid:#{$$})\n" unless message[-1] == ?\n
      buffer << message
      auto_flush
      message
    end
  end
end