Some late night metaprogramming

ruby-talk
1

class Module

  # Note: view is public, private, protected, or nil.

  def def_methods(view=nil, &block)
    @defmethods ||= DefMethods.new(self, view)
    @defmethods.instance_eval(&block)
  end

  class DefMethods
    private *instance_methods.select{ |m| m !~ /^(__|instance_eval)/ }

    def initialize(base, view=nil)
      @base = base
      @view = view
    end

    def method_missing(s, *a, &b)
      @base.__send__(:define_method, s, &b)
      @base.__send__(@view, s) if @view
    end
  end

end

# Example

class X

  def_methods(:public) do

    world = "World!"

    hello do
      "Hello"
    end

    hello_world do
      hello + ' ' + world
    end

  end

end

x = X.new
puts x.hello_world