rmu color formatter example

gistfile1.rb

  class ColorFormatter < Log4r::Formatter
    attr_accessor :color, :label, :colors, :format_string

    def colors
      @level_colors ||  [:cyan, :green, :yellow, :light_red, :red]
    end

    def initialize(opts={})
      @depth = (opts[:depth] || 7 ).to_i
      @color = opts[:color] || true
      @format_string = opts[:format_string] || "%d [%9l] %m"
      @trace_format_string = opts[:trace_format_string] || " $FROM %T"
      @level_colors = opts[:level_colors] ||
    end

    def format(event)
      event_color = colors[event.level -1]
      buff = @label ? sprintf(@format_string, Log4r::MaxLevelLength,
          Log4r::LNAMES[event.level]) : ""
      buff << format_object(event.data)
      buff << (event.tracer.nil? ? "" : "#from: #{event.tracer[0]}")
      buff << "\n"
      self.color ? buff.colorize(event_color) : buff
    end

    def format_object(obj)
      if obj.kind_of? Exception
        return "Caught #{obj.class}: #{obj.message}\n\t" + obj.backtrace[0...@depth].join("\n\t")
      elsif obj.kind_of? String
        return obj
      else # inspect the object
        return "#{obj.class}: #{obj.inspect}"
      end
    end