pipe.rb

module Pipe

  # Calls a list of methods in succession (i.e. pipes through)
  # Include the module in your class to prove the `pipe` method.
  #
  # Example:
  #
  # include Pipe
  #
  # def do_a_thing
  #   pipe(
  #     "hello world",
  #     :first_method,
  #     :second_method,
  #     [SomeClass, :class_method_to_run_third]
  #     :last_method
  #   )
  # end
  #
  # @param start_value The value that is going to be piped through various methods.
  # @param method_names [:symbol, [Class, :symbol]] The names of the methods
  #   to pipe the value through. These can be instance methods or class methods.
  #   Class methods should include the class name and method name in an array.
  def pipe(start_value, *method_names)
    method_names.inject(start_value) do |value, method_name|
      case method_name
      when Array
        method_name[0].send(method_name[1], value)
      else
        send(method_name, value)
      end
    end
  end

end