Small DSL for SRC charity tutorial.

configuration.rb

class AppServer
    attr_accessor :port, :admin_password
end


class Configuration
    attr_reader :app_server
    attr_accessor :tail_logs, :max_connections, :admin_password

    def app_server(&block)
        if block
            if not @app_server
                @app_server = AppServer.new
            end
            yield @app_server
        end
        @app_server
    end
end


def configure
    c = Configuration.new
    yield c
    c
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.admin_password = config.admin_password
        app_server_config.port = 8808
    end
end


p configuration.class # => Configuration
p configuration.tail_logs # => true
p configuration.app_server.class # => 'AppServer'
p configuration.app_server.admin_password # => 'secret'