Decorative and building!

base_decorator.rb

module DecorativeBuildr
  class BaseDecorator
  
    def initialize(decorated)
      @decorated = decorated
    end
  
    def method_missing(method,*args)
      @decorated.send(method,args)
    end
  end  
end

builder.rb

module DecorativeBuildr 
  # A building module which could be included in any 
  # class to concat multiple strings with a seperator/
  # line ending.
  #   
  #   @example
  #   class Sample
  #     include Util::Builder  
  #   end 
  #
  #   sample = Sample.new
  #   sample.build_info(:line_ending => "<br/>") do |builder|
  #     builder.add "One"
  #     builder.add "Two"
  #   end
  #
  #
  # The result should be something like this:
  #   
  #   @example
  #   One<br/>Two<br/>
  #
  # @author Daniel Schmidt
  module Builder
    
    def add(line)
      @infos << rescue_nil_string(line) << @line_ending
    end
    
    # Concats multiple string with a line ending. It receives a block. 
    # @param [Hash] opt Optional configuration hash with :line_ending key, which is \n by default.
    # @return [String] The concated String 
    def build_info(opt={},&block)
      raise "Arguments in invalid form" unless opt.is_a?(Hash)
      @infos = rescue_nil_string(@infos)
      @line_ending = opt.fetch(:line_ending, "\n")
      block.call(self)
      return @infos
    end
    
    private
    
    def rescue_nil_string(string)
      string.nil? ? "" : string
    end
    
  end
end

decorative_buildr.gemspec

Gem::Specification.new do |s|
  s.name        = 'decorative_buildr'
  s.version     = '0.1.1'
  s.platform    = Gem::Platform::RUBY
  s.author      = 'Daniel Schmidt'
  s.email       = 'dsci@code79.net'
  s.summary     = 'DecorativeBuildr!'
  s.description = 'Basic decorator pattern and a simple builder.'

  s.files         = ['decorative_buildr.rb','base_decorator.rb', 'builder.rb']
  #s.test_file     = 'bang_spec.rb'
  s.require_path  = '.'

  # This will added later. 
  #s.add_development_dependency('rspec', ["~> 2.0"])
end

decorative_buildr.rb

Dir[File.expand_path(File.join(File.dirname(__FILE__), '*.rb'))].each{|file| require file}