#135 Making a Gem

sudo gem install echoe
mkdir -p uniquify/lib
touch README.rdoc Rakefile lib/uniquify.rb
rake -T
rake manifest
rake install
rake build_gemspec
git init
git add .
git commit -m "initial commit"
git remote add origin git@github.com:ryanb/uniquify.git
git push
touch CHANGELOG
touch init.rb

require 'rubygems'
require 'rake'
require 'echoe'

Echoe.new('uniquify', '0.1.0') do |p|
  p.description    = "Generate a unique token with Active Record."
  p.url            = "http://github.com/ryanb/uniquify"
  p.author         = "Ryan Bates"
  p.email          = "ryan@railscasts.com"
  p.ignore_pattern = ["tmp/*", "script/*"]
  p.development_dependencies = []
end

Dir["#{File.dirname(__FILE__)}/tasks/*.rake"].sort.each { |ext| load ext }

module Uniquify
  def self.included(base)
    base.extend ClassMethods
  end
  
  def ensure_unique(name)
    begin
      self[name] = yield
    end while self.class.exists?(name => self[name])
  end
  
  module ClassMethods
    
    def uniquify(*args, &block)
      options = { :length => 8, :chars => ('a'..'z').to_a + ('A'..'Z').to_a + ('0'..'9').to_a }
      options.merge!(args.pop) if args.last.kind_of? Hash
      args.each do |name|
        before_create do |record|
          if block
            record.ensure_unique(name, &block)
          else
            record.ensure_unique(name) do
              Array.new(options[:length]) { options[:chars].to_a[rand(options[:chars].to_a.size)] }.join
            end
          end
        end
      end
    end
    
  end
end

class ActiveRecord::Base
  include Uniquify
end

require 'uniquify'