My working document for my rails application template

template.rb

# Remove the gemfile so we can start with a clean slate otherwise Rails groups
# the gems in a very strange way
remove_file "Gemfile"
add_file "Gemfile"

prepend_to_file "Gemfile" do
  "source \"https://rubygems.org\""
end

# Add all the regular gems
gem "rails", "4.2.5.1"
gem "bootstrap-sass", "~> 3.3.6"
gem "sass-rails", "~> 5.0"
gem "uglifier", ">= 1.3.0"
gem "jquery-rails"
gem "jbuilder", "~> 2.0"
gem "sdoc", "~> 0.4.0", group: :doc
gem "bcrypt", "~> 3.1.7"
gem "figaro"
gem "pg"

gem_group :development, :test do
  gem "pry"
  gem "rspec-rails", "~> 3.0"
  gem "capybara"
  gem "database_cleaner"
  gem "selenium-webdriver"
  gem "factory_girl_rails", "~> 4.0"
  gem "shoulda-matchers", "~> 3.1"
end

gem_group :development do
  gem "web-console", "~> 2.0"
  gem "spring"
  gem "quiet_assets"
end

gem_group :test do
  gem "simplecov", require: false
end

# Set up figaro
run "bundle exec figaro install"

# Bundle and set up RSpec
run "bundle install"
run "rails generate rspec:install"

# Set up the spec folders for RSpec
run "mkdir spec/models"
run "mkdir spec/controllers"
run "mkdir spec/features"
run "touch spec/factories.rb"

# Inject into the factory girl files
append_to_file "spec/factories.rb" do
  "FactoryGirl.define do\nend"
end

insert_into_file "spec/rails_helper.rb", after: "RSpec.configure do |config|\n" do
  "  config.include FactoryGirl::Syntax::Methods\n"
end

# Set up simplecov
prepend_to_file "spec/spec_helper.rb" do
  "require \"simplecov\"\nSimpleCov.start(\"rails\")\n"
end

append_to_file ".gitignore" do
  "# Ignore test coverage files from SimpleCov\n/coverage"
end

# Set up Database Cleaner
insert_into_file "spec/rails_helper.rb", after: "RSpec.configure do |config|\n" do
  "  config.before(:suite) do\n    DatabaseCleaner.clean_with(:truncation)\n  end\n\n
  config.before(:each) do\n    DatabaseCleaner.strategy = :transaction\n  end\n\n
  config.before(:each, :js => true) do\n    DatabaseCleaner.strategy = :truncation\n  end\n\n
  config.before(:each) do\n    DatabaseCleaner.start\n  end\n\n
  config.after(:each) do\n    DatabaseCleaner.clean\n  end\n\n"
end

gsub_file "spec/rails_helper.rb",
          "config.use_transactional_fixtures = true",
          "config.use_transactional_fixtures = false"

# Set up Shoulda Matchers
append_to_file "spec/rails_helper.rb" do
  "\nShoulda::Matchers.configure do |config|\n  config.integrate do |with|\n    with.test_framework :rspec\n    with.library :rails\n  end\nend"
end

# Set up for scss and bootstrap
run "mv app/assets/stylesheets/application.css app/assets/stylesheets/application.scss"
run "touch app/assets/stylesheets/custom.scss"

append_to_file "app/assets/stylesheets/application.scss" do
  "\n\n@import \"bootstrap-sprockets\";\n@import \"bootstrap\";\n@import \"custom\";"
end

gsub_file "app/assets/stylesheets/application.scss",
          "*= require_tree .",
          ""

gsub_file "app/assets/stylesheets/application.scss",
          "*= require_self",
          ""

append_to_file "app/assets/javascripts/application.js" do
  "//= require bootstrap-sprockets"
end

insert_into_file "app/views/layouts/application.html.erb", before: "</head>" do
  "  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">"
end

# Remove the README.rdoc file and add a regular README.markdown file
remove_file "README.rdoc"
add_file "README.md"

# Set up as a git repo and make the first commit
after_bundle do
  git :init
  git add: '.'
  git commit: "-a -m 'Initial commit'"
end