lib/configuration.rb

   1 require 'yaml'
   2
   3 class Configuration
   4   include Enumerable
   5
   6   @@config_path = File.expand_path(File.join(File.dirname(__FILE__), '..', 'etc'))
   7
   8   def initialize(name)
   9     @config_name = name
  10   end
  11
  12   def config_file
  13     File.join(@@config_path, @config_name)
  14   end
  15
  16   def load_config
  17     STDERR.puts "Reloading configuration"
  18     @config_hash = indifferent_params(YAML::load(File.open(config_file)))
  19     @config_time = File.stat(config_file).mtime
  20   end
  21
  22   def stale?
  23     File.stat(config_file).mtime != @config_time
  24   end
  25
  26   def config_hash
  27     load_config if !@config_hash || stale?
  28     @config_hash
  29   end
  30
  31   def each(*args, &block)
  32     config_hash.each(*args, &block)
  33   end
  34
  35   def [](key)
  36     config_hash[key]
  37   end
  38
  39   def indifferent_hash
  40     Hash.new {|hash,key| hash[key.to_s] if Symbol === key }
  41   end
  42
  43   def indifferent_params(object)
  44     case object
  45       when Hash
  46         new_hash = indifferent_hash
  47         object.each {|key, value| new_hash[key] = indifferent_params(value) }
  48         new_hash
  49       when Array
  50         object.map {|item| indifferent_params(item) }
  51       else
  52         object
  53     end
  54   end
  55
  56   def self.load(name)
  57     new(name)
  58   end
  59 end