environment.rb

# Neater Github gem dependencies for Rails

module GithubGem
  def github_gem(gem_name, opts={})
    lib_name = gem_name.split('-', 2)[1]
    self.gem gem_name, {:lib => lib_name, :source => 'http://gems.github.com'}.merge(opts)
  end
end

Rails::Initializer.run do |config|
  config.extend GithubGem

  config.gem 'andand'
  config.github_gem 'binarylogic-authlogic', :version => '2.1.1'

  if %w(test development).include?(RAILS_ENV)
    config.gem "mocha"
    config.github_gem "thoughtbot-shoulda", :version => '>=2.10'
    config.github_gem "seanhussey-woulda"
  end
  # ...
end

# Certainly beats the equivalent
=begin
  config.gem 'andand'
  config.gem 'binarylogic-authlogic', :version => '2.1.1', 
             :lib => 'authlogic', :source => 'http://gems.github.com'

  if %w(test development).include?(RAILS_ENV)
    config.gem "mocha"
    config.gem "thoughtbot-shoulda", :version => '>=2.10', 
               :lib => 'shoulda', :source => 'http://gems.github.com'
    config.gem "seanhussey-woulda", 
               :lib => 'woulda', :source => 'http://gems.github.com'
  end
=end