My Rails projects template

rails3_template.rb

# create rvmrc file
create_file ".rvmrc", "rvm use 1.9.2-patched@#{app_name}"
run "rvm gemset create #{app_name}"
run "rvm use 1.9.2-patched@#{app_name}"

gem "compass"
gem 'compass-less-plugin'
gem 'barista'
gem "jquery-rails"

# rspec, factory girl, webrat, autotest for testing
gem 'database_cleaner', :group => :test
gem 'rspec-rails', :group => [:test, :development]
gem 'shoulda', :group => :test
gem 'factory_girl_rails', :group => :test
gem 'faker', :group => :test
gem 'spork', :group => :test
gem 'guard-spork', :group => :test
gem 'guard-rspec', :group => :test
gem 'rb-fsevent', :group => :test
gem 'growl', :group => :test # also install growlnotify from the Extras/growlnotify/growlnotify.pkg in Growl disk image

run 'bundle install'

rake "db:create", :env => 'development'
rake "db:create", :env => 'test'

remove_file 'public/javascripts/rails.js' # jquery-rails replaces this
generate 'jquery:install --ui'
generate 'rspec:install'
remove_file 'spec/spec_helper.rb'
create_file 'spec/spec_helper.rb' do
  <<-eos
require 'rubygems'
require 'spork'

Spork.prefork do  
  ENV["RAILS_ENV"] ||= 'test'
  require File.expand_path("../../config/environment", __FILE__)
  require 'rspec/rails'

  RSpec.configure do |config|
    config.mock_with :rspec
    config.use_transactional_fixtures = true
    
    config.before(:suite) do
      DatabaseCleaner.strategy = :truncation
      DatabaseCleaner.clean_with(:truncation)
    end

    config.before(:each) do
      DatabaseCleaner.start
    end

    config.after(:each) do
      DatabaseCleaner.clean
    end
  end
end

Spork.each_run do
  # This code will be run each time you run your specs.  
  # Requires supporting ruby files with custom matchers and macros, etc,
  # in spec/support/ and its subdirectories.
  Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}
  
  # reload Factories:
  Factory.definition_file_paths = [
    File.join(Rails.root, 'spec', 'factories')
  ]
  Factory.find_definitions
  # reload routes:
  #{app_name.capitalize}::Application.reload_routes!
end
  eos
end

inject_into_file 'app/views/layouts/application.html.erb', :after => "<%= stylesheet_link_tag :all %>" do
  "\n<%= stylesheet_link_tag 'less.css' %>"
end

inject_into_file 'config/application.rb', :after => "config.filter_parameters += [:password]" do
  <<-eos
    
    # Customize generators
    config.generators do |g|
      g.stylesheets false
      g.fixture_replacement :factory_girl, :dir => 'spec/factories'
    end
  eos
end

run "echo '--colour --drb --format doc' >> .rspec"
run 'guard init spork'
run 'guard init rspec'
run 'compass init rails -r less . --using less'
generate 'barista:install'
empty_directory 'app/coffeescript'

# clean up rails defaults
remove_file 'public/index.html'
remove_file 'rm public/images/rails.png'
run 'cp config/database.yml config/database.example'
run "echo 'config/database.yml' >> .gitignore"

# commit to git
git :init
git :add => "."
git :commit => "-a -m 'create initial application'"

say <<-eos
  ============================================================================
  Your new Rails application is ready to go.
  
  Don't forget to scroll up for important messages from installed generators.
eos

Installs RSpec, Spork, Factory Girl, Faker, Guard, Compass with Less Framework, Barista

Based on this blog post: http://everydayrails.com/2011/02/28/rails-3-application-templates.html