ember.rake

namespace :ember do
  task :update do
    [['~/.ember', 'git://github.com/emberjs/ember.js.git', 'ember.js'],
      ['~/.ember-data', 'git://github.com/emberjs/data.git', 'ember-data.js']
    ].each { |i| EmberBuild.new(*i).update }
  end
end

class EmberBuild
  attr_reader :ember_dir, :repo, :file_name, :gem_file

  def initialize root, repo, file_name
    @ember_dir = File.expand_path root
    @gem_file = File.join ember_dir, 'Gemfile'
    @repo, @file_name = repo, file_name
  end

  def update
    download_latest_version
    build_dist
    copy_to_vendor_assets
  end

  def update_repo
    Dir.chdir ember_dir do
      system 'git fetch origin && git reset origin/master --hard'
    end
  end

  def clone_repo
    system "git clone #{repo} '#{ember_dir}'"
  end

  def download_latest_version
    File.exist?(ember_dir) ? update_repo : clone_repo
  end

  def build_dist
    Dir.chdir ember_dir do
      Bundler.with_clean_env do
        system "bundle --gemfile #{gem_file}"
        system "BUNDLE_GEMFILE='#{gem_file}' bundle exec rake dist"
      end
    end
  end

  def copy_to_vendor_assets
    system "cp #{ember_dir}/dist/#{file_name} vendor/assets/javascripts"
  end
end