template.rb

module Gemfile
  class GemInfo
    def initialize(name) @name=name; @group=[]; @opts={}; end
    attr_accessor :name, :version
    attr_reader :group, :opts

    def opts=(new_opts={})
      new_group = new_opts.delete(:group)
      if (new_group && self.group != new_group)
        @group = ([self.group].flatten + [new_group].flatten).compact.uniq.sort
      end
      @opts = (self.opts || {}).merge(new_opts)
    end

    def group_key() @group end

    def gem_args_string
      args = ["'#{@name}'"]
      args << "'#{@version}'" if @version
      @opts.each do |name,value|
        args << ":#{name}=>#{value.inspect}"
      end
      args.join(', ')
    end
  end

  @geminfo = {}

  class << self
    # add(name, version, opts={})
    def add(name, *args)
      name = name.to_s
      version = args.first && !args.first.is_a?(Hash) ? args.shift : nil
      opts = args.first && args.first.is_a?(Hash) ? args.shift : {}
      @geminfo[name] = (@geminfo[name] || GemInfo.new(name)).tap do |info|
        info.version = version if version
        info.opts = opts
      end
    end

    def write
      File.open('Gemfile', 'a') do |file|
        file.puts
        grouped_gem_names.sort.each do |group, gem_names|
          indent = ""
          unless group.empty?
            file.puts "group :#{group.join(', :')} do" unless group.empty?
            indent="  "
          end
          gem_names.sort.each do |gem_name|
            file.puts "#{indent}gem #{@geminfo[gem_name].gem_args_string}"
          end
          file.puts "end" unless group.empty?
          file.puts
        end
      end
    end

    private
    #returns {group=>[...gem names...]}, ie {[:development, :test]=>['rspec-rails', 'mocha'], :assets=>[], ...}
    def grouped_gem_names
      {}.tap do |_groups|
        @geminfo.each do |gem_name, geminfo|
          (_groups[geminfo.group_key] ||= []).push(gem_name)
        end
      end
    end
  end
end
def add_gem(*all) Gemfile.add(*all); end

add_gem "haml"
add_gem "rspec-rails", "~> 2.0", :group => [:development, :test]
add_gem "guard-rspec", :group => [:development, :test]
add_gem "guard-rails", :group => [:development, :test]
add_gem "factory_girl_rails", :group => [:development, :test]
add_gem "database_cleaner", :group => [:development, :test]
add_gem "haml-rails", :group => [:development, :test]

Gemfile.write

run 'bundle install'

generate 'rspec:install'
run 'bundle exec guard init rspec rails'

inject_into_file "spec/spec_helper.rb", :after => "RSpec.configure do |config|\n" do
  <<-CODE
  config.before(:suite) do
    DatabaseCleaner.strategy = :truncation
    DatabaseCleaner.clean_with(:truncation)
  end
  
  config.after(:each) do
    DatabaseCleaner.clean
  end
  CODE
end

inside('app/views/layouts') do
  run "rm application.html.erb"
end

file 'app/views/layouts/application.html.haml', <<-CODE
!!!
%html
  %head
    %title Template
    = stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true
    = javascript_include_tag "application", "data-turbolinks-track" => true
    = csrf_meta_tags
  %body
    = yield
CODE