How to customize a logger in ruby

custom-logger.rb

require 'logger'

module Dim
  class Logger < ::Logger
    def initialize(*)
      super
      @formatter = NoTimestampFormatter.new
    end
  end

  class NoTimestampFormatter < ::Logger::Formatter
    def call(severity, time, progname, msg)
      format % [
        severity,
        msg2str(msg).strip
      ]
    end

    def format
      "%s: %s\n"
    end
  end
end