From: Roberto Cm <roberto.tomas.cuentas@...>
Date: 2010-04-20T03:24:00+09:00
Subject: ya config file parser

I'm wondering how to extend the config-yaml parser at
http://www.mjijackson.com/2010/02/flexible-ruby-config-objects so I can
write to the file through the variable.

right now it works like this:

yaml_data = "
---
database: mydb
auth:
  user: myuser
  pass: mypass
"

require 'yaml'
config = Config.new(YAML.load(yaml_data))

config.auth.user        # "myuser"


and I want to add some magic so I can do this instead:

config = Config.new(yaml_filename_variable)
config.a = "test"
p config.a
=> "test"
config.write()
config = nil
config = Config.new(yaml_filename_variable)
p config-a
=> "test"


to load the file on new(), I changed the class like this:

require 'yaml'

class ConfigYaml

  def initialize(file)
    if file.nil?? then
      yaml_conf = YAML.load_file(file)
    end
    @data = case yaml_conf.nil?
      when true then YAML.load_file(file)
      else {}
    end
    update!(data)
  end

private
...
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