kelso/template.rb

## template.rb
# Usage:
#   rails new my_app -m template.rb
#
# or for existing app (inside an app folder):
#   rails app:template LOCATION=../template.rb

# Gemfile
gem 'bootstrap', '~> 5.1.3'
gem 'sass-rails', '~> 6.0.0'
gem_group :development, :test do
  gem 'dotenv-rails'
end

# Application layout
remove_file 'app/views/layouts/application.html.erb'
create_file 'app/views/layouts/application.html.erb' do <<-HTML
<!DOCTYPE html>
<html>
  <head>
    <title><%= full_title(yield(:title)) %></title>
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

    <%= stylesheet_link_tag "application", "data-turbo-track": "reload" %>
    <%= javascript_importmap_tags %>
  </head>

  <body>
    <%= render 'shared/navbar' %>

    <div class="container">
      <%= yield %>
    </div>
  </body>
</html>
HTML
end

# Add navbar partial
create_file 'app/views/shared/_navbar.html.erb', <<-HTML
<nav class="navbar navbar-expand-md navbar-dark bg-dark mb-3">
  <div class="container">
    <%= link_to "My App", root_path, class: "navbar-brand" %>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbar">
      <ul class="navbar-nav me-auto">
        <li class="nav-item">
          <%= link_to "Home", root_path, class: "nav-link" %>
        </li>
        <li class="nav-item">
          <%= link_to "About", about_path, class: "nav-link" %>
        </li>
      </ul>
    </div>
  </div>
</nav>
HTML

# Use after_bundle block to run code after Rails has generated the application
after_bundle do
  # Importmap pins
  append_to_file 'config/importmap.rb', <<-RUBY.strip_heredoc
  pin "bootstrap", to: "https://ga.jspm.io/npm:bootstrap@5.1.3/dist/js/bootstrap.esm.js"
  pin "@popperjs/core", to: "https://unpkg.com/@popperjs/core@2.11.2/dist/esm/index.js" # use unpkg.com as ga.jspm.io contains a broken popper package
  RUBY

  # Append Bootstrap import statements to app/javascript/application.js
  append_to_file 'app/javascript/application.js', <<-JS.strip_heredoc
  // Bootstrap
  import '@popperjs/core';
  import * as bootstrap from 'bootstrap';
  JS
end

# Application stylesheet
remove_file 'app/assets/stylesheets/application.css'
create_file 'app/assets/stylesheets/application.scss' do <<-SCSS
@import 'bootstrap';
SCSS
end

# Full title helper
inject_into_file 'app/helpers/application_helper.rb', after: "module ApplicationHelper\n" do
  <<-RUBY
  def full_title(page_title = '')
    base_title = 'My App'
    if page_title.empty?
      base_title
    else
      page_title + ' | ' + base_title
    end
  end
  RUBY
end

# Config variables
inject_into_file 'config/application.rb', after: "class Application < Rails::Application\n" do
  <<-RUBY
    config.generators do |generate|
      generate.helper false
      generate.assets false
      generate.view_specs false
      generate.helper_specs false
      generate.routing_specs false
      generate.controller_specs false
      generate.system_tests false
    end
  RUBY
end

# Dotenv
create_file '.env' do <<-FILE
SECRET_KEY_BASE=placeholder
FILE
end

# Add root route
route "root to: 'pages#index'"

# Add routes
route "get 'about', to: 'pages#about'"

# Pages controller
create_file 'app/controllers/pages_controller.rb' do
  <<-RUBY
  class PagesController < ApplicationController
    def index
    end

    def about
    end
  end
  RUBY
end

# Index view
create_file 'app/views/pages/index.html.erb' do
  <<-HTML.strip_heredoc
  <%= content_for :title, 'Home' %>

  <h1>Hello world</h1>
  <p>This is the home page.</p>
  HTML
end

# About view
create_file 'app/views/pages/about.html.erb' do
  <<-HTML.strip_heredoc
  <%= content_for :title, 'About' %>

  <h1>About</h1>
  <p>Lorem ipsum dolor sit.</p>
  HTML
end
	# Usage:
	# rails new my_app -m template.rb
	#
	# or for existing app (inside an app folder):
	# rails app:template LOCATION=../template.rb

	# Gemfile
	gem 'bootstrap', '~> 5.1.3'
	gem 'sass-rails', '~> 6.0.0'
	gem_group :development, :test do
	gem 'dotenv-rails'
	end

	# Application layout
	remove_file 'app/views/layouts/application.html.erb'
	create_file 'app/views/layouts/application.html.erb' do <<-HTML
	<!DOCTYPE html>
	<html>
	<head>
	<title><%= full_title(yield(:title)) %></title>
	<meta name="viewport" content="width=device-width,initial-scale=1">
	<%= csrf_meta_tags %>
	<%= csp_meta_tag %>

	<%= stylesheet_link_tag "application", "data-turbo-track": "reload" %>
	<%= javascript_importmap_tags %>
	</head>

	<body>
	<%= render 'shared/navbar' %>

	<div class="container">
	<%= yield %>
	</div>
	</body>
	</html>
	HTML
	end

	# Add navbar partial
	create_file 'app/views/shared/_navbar.html.erb', <<-HTML
	<nav class="navbar navbar-expand-md navbar-dark bg-dark mb-3">
	<div class="container">
	<%= link_to "My App", root_path, class: "navbar-brand" %>
	<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
	<span class="navbar-toggler-icon"></span>
	</button>
	<div class="collapse navbar-collapse" id="navbar">
	<ul class="navbar-nav me-auto">
	<li class="nav-item">
	<%= link_to "Home", root_path, class: "nav-link" %>
	</li>
	<li class="nav-item">
	<%= link_to "About", about_path, class: "nav-link" %>
	</li>
	</ul>
	</div>
	</div>
	</nav>
	HTML

	# Use after_bundle block to run code after Rails has generated the application
	after_bundle do
	# Importmap pins
	append_to_file 'config/importmap.rb', <<-RUBY.strip_heredoc
	pin "bootstrap", to: "https://ga.jspm.io/npm:bootstrap@5.1.3/dist/js/bootstrap.esm.js"
	pin "@popperjs/core", to: "https://unpkg.com/@popperjs/core@2.11.2/dist/esm/index.js" # use unpkg.com as ga.jspm.io contains a broken popper package
	RUBY

	# Append Bootstrap import statements to app/javascript/application.js
	append_to_file 'app/javascript/application.js', <<-JS.strip_heredoc
	// Bootstrap
	import '@popperjs/core';
	import * as bootstrap from 'bootstrap';
	JS
	end

	# Application stylesheet
	remove_file 'app/assets/stylesheets/application.css'
	create_file 'app/assets/stylesheets/application.scss' do <<-SCSS
	@import 'bootstrap';
	SCSS
	end

	# Full title helper
	inject_into_file 'app/helpers/application_helper.rb', after: "module ApplicationHelper\n" do
	<<-RUBY
	def full_title(page_title = '')
	base_title = 'My App'
	if page_title.empty?
	base_title
	else
	page_title + ' \| ' + base_title
	end
	end
	RUBY
	end

	# Config variables
	inject_into_file 'config/application.rb', after: "class Application < Rails::Application\n" do
	<<-RUBY
	config.generators do \|generate\|
	generate.helper false
	generate.assets false
	generate.view_specs false
	generate.helper_specs false
	generate.routing_specs false
	generate.controller_specs false
	generate.system_tests false
	end
	RUBY
	end

	# Dotenv
	create_file '.env' do <<-FILE
	SECRET_KEY_BASE=placeholder
	FILE
	end

	# Add root route
	route "root to: 'pages#index'"

	# Add routes
	route "get 'about', to: 'pages#about'"

	# Pages controller
	create_file 'app/controllers/pages_controller.rb' do
	<<-RUBY
	class PagesController < ApplicationController
	def index
	end

	def about
	end
	end
	RUBY
	end

	# Index view
	create_file 'app/views/pages/index.html.erb' do
	<<-HTML.strip_heredoc
	<%= content_for :title, 'Home' %>

	<h1>Hello world</h1>
	<p>This is the home page.</p>
	HTML
	end

	# About view
	create_file 'app/views/pages/about.html.erb' do
	<<-HTML.strip_heredoc
	<%= content_for :title, 'About' %>

	<h1>About</h1>
	<p>Lorem ipsum dolor sit.</p>
	HTML
	end