Configuration loading library for Sinatra apps

gistfile1.rb

#           NAME: configurator
#        VERSION: 1.0
#         AUTHOR: Peter Cooper [ http://www.rubyinside.com/ github:peterc twitter:peterc ]
#    DESCRIPTION: Sinatra library to load app-wide configurations
#  COMPATIBILITY: All, in theory - tested on Hoboken
#        LICENSE: Use for what you want
#
#   INSTRUCTIONS: 
#                 1. Ensure _this_ file is lib/initializer.rb within your app's directory structure
#                 2. Add require 'lib/configurator' to your Sinatra app
#                 3. Place YAML configuration files in /config (e.g. general.yaml, development.yaml, etc.)
#                 4. Use CONFIG[:whatever] from within your Sinatra app


# Establish base directory names
  APP_ROOT = File.dirname(File.expand_path($0)) unless defined?(APP_ROOT)
  CONFIG_DIR = File.join(APP_ROOT, "config") unless defined?(CONFIG_DIR)

# Only load configurations if there's a config directory in the first place..
  if File.directory?(CONFIG_DIR)

    # Load general configuration
    CONFIG = YAML.load(File.read(File.join(CONFIG_DIR, "general.yaml"))) rescue {}

    # Merge in configurations based on environments
      [:development, :production, :test].each do |e|
        configure(e) { CONFIG.merge!(YAML.load(File.read(File.join(CONFIG_DIR, "development.yaml")))) rescue {} }
      end  
  end