Scottish Ruby Conference tutorial exercise

config.rb

class AppServerConfiguration
  attr_accessor :port, :admin_password
end

class Configuration
  attr_accessor :tail_logs, :max_connections, :admin_password
  
  def initialize(block)
    block.call(self)
  end
  
  def app_server
    @app_server ||= AppServerConfiguration.new
    yield @app_server if block_given?
    @app_server    
  end
end

def configure(&block)
  Configuration.new(block)
end

configuration = configure do |config|  
  config.tail_logs = true  
  config.max_connections = 55  
  config.admin_password = 'secret'  
  config.app_server do |app_server_config|  
    app_server_config.port = 8808  
    app_server_config.admin_password = config.admin_password  
  end  
end  
  
puts configuration.class # => Configuration  
puts configuration.tail_logs # => true  
puts configuration.app_server.admin_password # => 'secret'