From: Drew Olson <olsonas@...>
Date: 2008-02-29T08:11:15+09:00
Subject: Re: Help with the DSL (ish) config class

Drew Olson wrote:
> M.W. Mitchell wrote:
>> Hi,
>> 
>> I experimenting with this config class. I'm hoping to get something
>> really easy to write and I'm on to something here, well at least I
>> thought I was. This class allows me to build a nested Has like:
> 
> I threw this together in a few minutes, doesn't support nested hashes 
> though :(

I spoke too soon, it does now :)

require 'yaml'

class Configuration
  def initialize(filename=nil)
    @filename = filename
    @hash = {}
  end

  def method_missing(name,*args,&block)
    if block
      config = Configuration.new
      config.instance_eval(&block)
      @hash[name] = config.hash_value
    else
      @hash[name] = args.first
    end
  end

  def store
    File.open(@filename,"w") do |out|
      out << YAML::dump(@hash)
    end
  end

  def hash_value
    @hash
  end
end

def Configuration filename=nil,&block
  config = Configuration.new(filename)
  config.instance_eval(&block)
end

Configuration "my_app.yaml" do
  a 10
  b 20
  c 30
  d do
    d1 10
    d2 20
  end

  store
end

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