an example of metaprogramming in ruby

bit.rb

  class Logging
    
    def initialize
      @PROMPTS = {
        :info => '>>'.bold.green,
        :warn => '**'.bold.yellow,
        :error => '!!'.red,
        :fatal => '!!'.bold.red,
        :debug => '**'.bold.cyan
      }
      
      @LOG = File.open('/tmp/builder.log', 'a+')
    end
    
    def method_missing(method, *args, &block)
      if method =~ /^(info|warn|error|fatal|debug)/
        out = "#{@PROMPTS[method.to_sym]} #{args.join ' '}"
        @LOG.write out
        puts out
      else
        super.method_missing(method, *args, &block)
      end
    end
    
  end