Option Proxy

option_proxy.rb

require "active_support/core_ext/module/delegation"

module UI
	class OptionProxy
		def initialize(parent, *method_names)
			@__parent__ = parent
			@__options__ = {}

			method_names.each do |option|
				define_singleton_method("#{option}=") { |value| @__options__[option.to_sym] = value }
			end
		end

		def yield!(options)
			return unless block_given?
			yield self
			options.merge!(**self)
		end

		delegate :to_hash, to: :@__options__

		def respond_to_missing?(method_name, *args, &block)
			String(method_name).end_with?("=")
		end

		def method_missing(method_name, *args, &block)
			if @__parent__.respond_to?(method_name)
				@__parent__.send method_name, *args, &block
			elsif respond_to_missing?(method_name)
				option = String(method_name).delete_suffix("=").to_sym
				@__options__[option] = args.shift
			else
				public_send method_name, *args, &block
			end
		end
	end
end