Module Maker

module_maker.rb

module SomeAPI
  def self.get_var mod, meth
    vars_for(mod)[meth]
  end
  
  def self.set_var mod, meth, val
    vars_for(mod)[meth] = val
  end
  
  def self.vars_for mod
    @all_my_vars ||= {}
    @all_my_vars[mod] ||= {}
  end
end

module ModuleMaker

  def self.make_module mod_name, method_list
    mod = Module.new do
      method_list.each do |meth_name|
        define_method("#{meth_name}") { SomeAPI.get_var(mod_name, meth_name) }
        define_method("#{meth_name}=") { |val| SomeAPI.set_var(mod_name, meth_name, val) }
      end
    end
    mod.send :extend, mod

    Object.const_set mod_name, mod
  end

end


### Test it

ModuleMaker.make_module "Runtime", ["runtime", "foobar"]

puts Runtime.methods.inspect

Runtime.foobar = 42
Runtime.runtime = "Hello World"

puts "foobar is == #{Runtime.foobar}"
puts "runtime is == #{Runtime.runtime}"

# chaos@godel:scraps$ ruby module_maker.rb 
# [:runtime, :runtime=, :foobar, :foobar=, ... ]
# foobar is == 42 
# runtime is == Hello World