Require No Interface - http://practicingruby.com/articles/shared/ozkzbsdmagcm

gistfile1.rb

module Inspector
  def self.analyze(data)
    registered_plugins.each do |name, block|
      puts "Report: #{name}"
      block.call(data)
    end
  end

  def self.registered_plugins
    @registered_plugins ||= {}
  end

  def self.report(name, &block)
    registered_plugins[name] = block
  end
end

module WordLengthPlugin
  def self.analyze(data)
    longest = data.split(/ /).map { |e| e.length }.max
    puts "Longest word contained #{longest} characters"
  end
end

# delegates to the WordLengthPlugin module
Inspector.report("Word Length") do |data|
  WordLengthPlugin.analyze(data)
end

# implements the report as an inline function
Inspector.report("Word Count") do |data|
  word_count = data.split(/ /).length
  puts "Content contained #{word_count} words"
end

Inspector.analyze("This is a test of the watcher plugins")