Dynamically generate README

Create README based off the `desc` of the generators.

We chose to create a custom class instead of a traditional generator
because this script is intended to be run in the [application
template][] as a Rake task. It is not intended to be run as a standalone
generator, since it only makes sense to be run on concert with
`suspenders:install:web`.

Updates all generator descriptions to use Herdoc syntax to ensure
consistent line breaks.

[application template]: https://guides.rubyonrails.org/rails_application_templates.html

lib/generators/suspenders/accessibility_generator.rb

@@ -3,7 +3,9 @@ module Generators
     class AccessibilityGenerator < Rails::Generators::Base
       include Suspenders::Generators::APIAppUnsupported
 
-      desc "Installs capybara_accessibility_audit and capybara_accessible_selectors"
+      desc <<~MARKDOWN
+        Installs capybara_accessibility_audit and capybara_accessible_selectors"
+      MARKDOWN
 
       def add_capybara_gems
         gem_group :test do

lib/generators/suspenders/advisories_generator.rb

@@ -2,12 +2,12 @@ module Suspenders
   module Generators
     class AdvisoriesGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/advisories", __FILE__)
-      desc(<<~TEXT)
+      desc <<~MARKDOWN
         Show security advisories during development.
 
         Uses the `bundler-audit` gem to update the local security database and
         show any relevant issues with the app's dependencies via a Rake task.
-      TEXT
+      MARKDOWN
 
       def add_bundler_audit
         gem_group :development, :test do

lib/generators/suspenders/ci_generator.rb

@@ -5,7 +5,9 @@ class CiGenerator < Rails::Generators::Base
       include Suspenders::Generators::Helpers
 
       source_root File.expand_path("../../templates/ci", __FILE__)
-      desc "Creates CI files for GitHub Actions"
+      desc <<~MARKDOWN
+        Creates CI files for GitHub Actions
+      MARKDOWN
 
       def ci_files
         empty_directory ".github/workflows"

lib/generators/suspenders/email_generator.rb

@@ -2,15 +2,15 @@ module Suspenders
   module Generators
     class EmailGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/email", __FILE__)
-      desc <<~TEXT
+      desc <<~MARKDOWN
         Intercepts emails in non-production environments by setting `INTERCEPTOR_ADDRESSES`.
 
         ```sh
         INTERCEPTOR_ADDRESSES="[email protected],[email protected]" bin/rails s
         ```
 
         Configures `default_url_options` in `test` and `development`.
-      TEXT
+      MARKDOWN
 
       def create_email_interceptor
         copy_file "email_interceptor.rb", "app/mailers/email_interceptor.rb"

lib/generators/suspenders/factories_generator.rb

@@ -4,7 +4,7 @@ class FactoriesGenerator < Rails::Generators::Base
       include Suspenders::Generators::Helpers
 
       source_root File.expand_path("../../templates/factories", __FILE__)
-      desc <<~TEXT
+      desc <<~MARKDOWN
         Build test data with clarity and ease.
 
         This uses FactoryBot to help you define dummy and test data for your test
@@ -17,7 +17,7 @@ class FactoriesGenerator < Rails::Generators::Base
         definitions.
 
         Supports the default test suite and RSpec.
-      TEXT
+      MARKDOWN
 
       def add_factory_bot
         gem_group :development, :test do

lib/generators/suspenders/inline_svg_generator.rb

@@ -3,7 +3,9 @@ module Generators
     class InlineSvgGenerator < Rails::Generators::Base
       include Suspenders::Generators::APIAppUnsupported
       source_root File.expand_path("../../templates/inline_svg", __FILE__)
-      desc "Render SVG images inline, as a potential performance improvement for the viewer."
+      desc <<~MARKDOWN
+        Render SVG images inline, as a potential performance improvement for the viewer.
+      MARKDOWN
 
       def add_inline_svg_gem
         gem "inline_svg"

lib/generators/suspenders/jobs_generator.rb

@@ -2,7 +2,9 @@ module Suspenders
   module Generators
     class JobsGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/active_job", __FILE__)
-      desc "Installs Sidekiq for background job processing."
+      desc <<~MARKDOWN
+        Installs Sidekiq for background job processing.
+      MARKDOWN
 
       def add_sidekiq_gem
         gem "sidekiq"

lib/generators/suspenders/lint_generator.rb

@@ -4,7 +4,9 @@ class LintGenerator < Rails::Generators::Base
       include Suspenders::Generators::Helpers
 
       source_root File.expand_path("../../templates/lint", __FILE__)
-      desc "Creates a holistic linting solution that covers JavaScript, CSS, Ruby and ERB."
+      desc <<~MARKDOWN
+        Creates a holistic linting solution that covers JavaScript, CSS, Ruby and ERB.
+      MARKDOWN
 
       def check_package_json
         unless File.exist? Rails.root.join("package.json")

lib/generators/suspenders/prerequisites_generator.rb

@@ -3,7 +3,9 @@ module Generators
     class PrerequisitesGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/prerequisites", __FILE__)
 
-      desc "Configures prerequisites. Currently Node."
+      desc <<~MARKDOWN
+        Configures prerequisites. Currently Node.
+      MARKDOWN
 
       def node_version
         template "node-version", ".node-version"

lib/generators/suspenders/rake_generator.rb

@@ -2,10 +2,10 @@ module Suspenders
   module Generators
     class RakeGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/rake", __FILE__)
-      desc(<<~TEXT)
+      desc <<~MARKDOWN
         Configures the default Rake task to audit and lint the codebase with
         `bundler-audit` and `standard`, in addition to running the test suite.
-      TEXT
+      MARKDOWN
 
       def configure_default_rake_task
         append_to_file "Rakefile", <<~RUBY

lib/generators/suspenders/setup_generator.rb

@@ -2,13 +2,13 @@ module Suspenders
   module Generators
     class SetupGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/setup", __FILE__)
-      desc <<~TEXT
+      desc <<~MARKDOWN
         A holistic setup script.
 
         ```sh
         bin/setup
         ```
-      TEXT
+      MARKDOWN
 
       def replace_bin_setup
         copy_file "bin_setup.rb", "bin/setup", force: true

lib/generators/suspenders/styles_generator.rb

@@ -3,11 +3,11 @@ module Generators
     class StylesGenerator < Rails::Generators::Base
       include Suspenders::Generators::APIAppUnsupported
 
-      desc <<~TEXT
+      desc <<~MARKDOWN
         Configures application to use PostCSS via cssbundling-rails.
 
         Adds modern-normalize, and style sheet structure.
-      TEXT
+      MARKDOWN
 
       def add_cssbundling_rails_gem
         gem "cssbundling-rails"

lib/generators/suspenders/tasks_generator.rb

@@ -2,11 +2,11 @@ module Suspenders
   module Generators
     class TasksGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/tasks", __FILE__)
-      desc <<~TEXT
+      desc <<~MARKDOWN
         Creates local Rake tasks for development
 
         bin/rails dev:prime # Sample data for local development environment
-      TEXT
+      MARKDOWN
 
       def create_dev_rake
         if Bundler.rubygems.find_name("factory_bot").any?

lib/generators/suspenders/testing_generator.rb

@@ -2,7 +2,9 @@ module Suspenders
   module Generators
     class TestingGenerator < Rails::Generators::Base
       source_root File.expand_path("../../templates/testing", __FILE__)
-      desc "Set up the project for an in-depth test-driven development workflow."
+      desc <<~MARKDOWN
+        Set up the project for an in-depth test-driven development workflow.
+      MARKDOWN
 
       def add_gems
         gem_group :development, :test do

lib/generators/suspenders/views_generator.rb

@@ -3,7 +3,9 @@ module Generators
     class ViewsGenerator < Rails::Generators::Base
       include Suspenders::Generators::APIAppUnsupported
 
-      desc "Configures flash messages, page titles and the document lang. Disables Turbo's InstantClick."
+      desc <<~MARKDOWN
+        Configures flash messages, page titles and the document lang. Disables Turbo's InstantClick.
+      MARKDOWN
       source_root File.expand_path("../../templates/views", __FILE__)
 
       def install_gems

lib/suspenders.rb

@@ -3,6 +3,7 @@
 require "suspenders/railtie"
 require "suspenders/generators"
 require "suspenders/cleanup/organize_gemfile"
+require "suspenders/cleanup/generate_readme"
 
 module Suspenders
   # Your code goes here...

lib/suspenders/cleanup/generate_readme.rb

@@ -0,0 +1,151 @@
+require "rails/generators"
+require_relative "../../generators/suspenders/environments/development_generator"
+require_relative "../../generators/suspenders/environments/test_generator"
+require_relative "../../generators/suspenders/environments/production_generator"
+require_relative "../../generators/suspenders/accessibility_generator"
+require_relative "../../generators/suspenders/advisories_generator"
+require_relative "../../generators/suspenders/email_generator"
+require_relative "../../generators/suspenders/factories_generator"
+require_relative "../../generators/suspenders/inline_svg_generator"
+require_relative "../../generators/suspenders/jobs_generator"
+require_relative "../../generators/suspenders/lint_generator"
+require_relative "../../generators/suspenders/styles_generator"
+require_relative "../../generators/suspenders/testing_generator"
+require_relative "../../generators/suspenders/views_generator"
+
+module Suspenders
+  module Cleanup
+    class GenerateReadme
+      def self.perform(readme, app_name)
+        new(readme, app_name).perform
+      end
+
+      attr_reader :readme, :app_name
+
+      def initialize(readme, app_name)
+        @readme = readme
+        @app_name = app_name
+      end
+
+      def perform
+        File.open(readme, "w+") do |file|
+          @file = file
+
+          heading app_name, level: 1
+
+          prerequisites
+
+          local_development
+
+          heading "Configuration", level: 2
+
+          heading "Test", level: 3
+          description_for Suspenders::Generators::Environments::TestGenerator
+
+          heading "Development", level: 3
+          description_for Suspenders::Generators::Environments::DevelopmentGenerator
+
+          heading "Production", level: 3
+          description_for Suspenders::Generators::Environments::ProductionGenerator
+
+          heading "Linting", level: 3
+          description_for Suspenders::Generators::LintGenerator
+
+          heading "Testing", level: 2
+          description_for Suspenders::Generators::TestingGenerator
+
+          heading "Factories", level: 3
+          description_for Suspenders::Generators::FactoriesGenerator
+
+          heading "Accessibility", level: 2
+          description_for Suspenders::Generators::AccessibilityGenerator
+
+          heading "Advisories", level: 2
+          description_for Suspenders::Generators::AdvisoriesGenerator
+
+          heading "Mailers", level: 2
+          description_for Suspenders::Generators::EmailGenerator
+
+          heading "Jobs", level: 2
+          description_for Suspenders::Generators::JobsGenerator
+
+          heading "Layout and Assets", level: 2
+
+          heading "Stylesheets", level: 3
+          description_for Suspenders::Generators::StylesGenerator
+
+          heading "Inline SVG", level: 3
+          description_for Suspenders::Generators::InlineSvgGenerator
+
+          heading "Layout", level: 3
+          description_for Suspenders::Generators::ViewsGenerator
+        end
+      end
+
+      private
+
+      def new_line
+        @file.write "\n"
+      end
+
+      def heading(text, level:)
+        @file.write "#{"#" * level} #{text}\n"
+        new_line
+      end
+
+      def description_for(generator)
+        @file.write generator.desc
+        new_line
+      end
+
+      def local_development
+        @file.write <<~MARKDOWN
+          ## Local Development
+
+          ### Initial Setup
+
+          ```
+          bin/setup
+          ```
+
+          ### Running the Development Server
+
+          ```
+          bin/rails dev
+          ```
+
+          ### Seed Data
+
+          - Use `db/seeds.rb` to create records that need to exist in all environments.
+          - Use `lib/tasks/dev.rake` to create records that only need to exist in development.
+
+          Running `bin/setup` will run `dev:prime`.
+
+          ### Tasks
+
+          - Use `bin/rails suspenders:db:migrate` to run [database migrations][]. This script ensures they are [reversible][].
+          - Use `bin/rails suspenders:cleanup:organize_gemfile` to automatically organize the project's Gemfile.
+          - Use `bin/rails default` to run the default Rake task. This will do the following:
+            - Run the test suite.
+            - Run a Ruby and ERB linter.
+            - Scan the Ruby codebase for any dependecy vulnerabilities.
+
+          [database migrations]: https://edgeguides.rubyonrails.org/active_record_migrations.html#running-migrations
+          [reversible]: https://edgeguides.rubyonrails.org/active_record_migrations.html#making-the-irreversible-possible
+
+        MARKDOWN
+      end
+
+      def prerequisites
+        heading "Prerequisites", level: 2
+
+        @file.write <<~MARKDOWN
+          Ruby: `#{Suspenders::MINIMUM_RUBY_VERSION}`
+          Node: `#{Suspenders::NODE_LTS_VERSION}`
+        MARKDOWN
+
+        new_line
+      end
+    end
+  end
+end

lib/tasks/suspenders.rake

@@ -28,5 +28,10 @@ namespace :suspenders do
     task :organize_gemfile do
       Suspenders::Cleanup::OrganizeGemfile.perform(Rails.root.join("Gemfile"))
     end
+
+    desc "Generate README"
+    task :generate_readme do
+      Suspenders::Cleanup::GenerateReadme.perform(Rails.root.join("README.md"), Rails.application.class.module_parent_name)
+    end
   end
 end