class Rails::AppBuilder

what those operations do so you can create another template action.
Gemfile, README, or JavaScript files, without needing to know exactly
This allows you to override entire operations, like the creation of the
generator.
generator without being forced to reverse the operations of the default
The application builder allows you to override elements of the application

def app 

def app
  directory 'app'
  keep_file  'app/assets/images'
  keep_file  'app/mailers'
  keep_file  'app/models'
  keep_file  'app/controllers/concerns'
  keep_file  'app/models/concerns'
end

def bin 

def bin
  directory "bin" do |content|
    "#{shebang}\n" + content
  end
  chmod "bin", 0755 & ~File.umask, verbose: false
end

def config 

def config
  empty_directory "config"
  inside "config" do
    template "routes.rb"
    template "application.rb"
    template "environment.rb"
    directory "environments"
    directory "initializers"
    directory "locales"
  end
end

def configru 

def configru
  template "config.ru"
end

def database_yml 

def database_yml
  template "config/databases/#{options[:database]}.yml", "config/database.yml"
end

def db 

def db
  directory "db"
end

def gemfile 

def gemfile
  template "Gemfile"
end

def gitignore 

def gitignore
  copy_file "gitignore", ".gitignore"
end

def lib 

def lib
  empty_directory 'lib'
  empty_directory_with_keep_file 'lib/tasks'
  empty_directory_with_keep_file 'lib/assets'
end

def log 

def log
  empty_directory_with_keep_file 'log'
end

def public_directory 

def public_directory
  directory "public", "public", recursive: false
end

def rakefile 

def rakefile
  template "Rakefile"
end

def readme 

def readme
  copy_file "README.rdoc", "README.rdoc"
end

def test 

def test
  empty_directory_with_keep_file 'test/fixtures'
  empty_directory_with_keep_file 'test/controllers'
  empty_directory_with_keep_file 'test/mailers'
  empty_directory_with_keep_file 'test/models'
  empty_directory_with_keep_file 'test/helpers'
  empty_directory_with_keep_file 'test/integration'
  template 'test/test_helper.rb'
end

def tmp 

def tmp
  empty_directory "tmp/cache"
  empty_directory "tmp/cache/assets"
end

def vendor 

def vendor
  vendor_javascripts
  vendor_stylesheets
end

def vendor_javascripts 

def vendor_javascripts
  empty_directory_with_keep_file 'vendor/assets/javascripts'
end

def vendor_stylesheets 

def vendor_stylesheets
  empty_directory_with_keep_file 'vendor/assets/stylesheets'
end