From: goodieboy <goodieBoy@...>
Date: 2008-03-15T02:22:19+09:00
Subject: Re: Help with the DSL (ish) config class

Thought I'd just update this as it's exactly what I was trying to do -
have the config settings in a file, but only the block contents. Now
in your config file, you can do:

# my_config.rb
rows 10
query_fields [:name,:address]
facets {
  fields [:business,:product_category]
  offset 0
}

And to turn that into a Hash:
Config.load_from_file('my_config.rb').to_hash

Neat!

-matt


============

class Config

  instance_methods.each { |m| undef_method m unless (m =~ /^__/) or
['class', 'instance_eval'].include?(m) }

  def initialize(init_data=nil, &block)
    @d = init_data || {}
    instance_eval(&block) if block_given?
  end

  def to_hash; @d; end

  def self.load_from_file(file)
    self.new.instance_eval File.read(file)
  end

  protected

  def method_missing(method, data=nil, &block)
    @d[method] = data
    return @d[method] = self.class.new(data, &block).to_hash if
data.nil?
    @d
  end

end