Make tilt an optional dependency

Author: janko

lib/generators/rodauth/install_generator.rb

@@ -40,12 +40,13 @@ def create_rodauth_app
 
         def add_gems
           if activerecord? && !sequel?
-            gem "sequel-activerecord_connection", "~> 2.0"
-            gem "after_commit_everywhere", "~> 1.1" if ActiveRecord.version < Gem::Version.new("7.2")
+            gem "sequel-activerecord_connection", "~> 2.0", comment: "Enables Sequel to use Active Record's database connection"
+            gem "after_commit_everywhere", "~> 1.1", comment: "Required for Sequel's transaction hooks to work in all cases (on Active Record < 7.2)" if ActiveRecord.version < Gem::Version.new("7.2")
           end
           unless argon2?
-            gem "bcrypt", "~> 3.1"
+            gem "bcrypt", "~> 3.1", comment: "Used by Rodauth for password hashing"
           end
+          gem "tilt", "~> 2.4", comment: "Used by Rodauth for rendering built-in view and email templates"
         end
 
         def create_rodauth_controller

rodauth-rails.gemspec

@@ -20,8 +20,8 @@ Gem::Specification.new do |spec|
   spec.add_dependency "rodauth", "~> 2.36"
   spec.add_dependency "roda", "~> 3.76"
   spec.add_dependency "rodauth-model", "~> 0.2"
-  spec.add_dependency "tilt"
 
+  spec.add_development_dependency "tilt"
   spec.add_development_dependency "bcrypt", "~> 3.1"
   spec.add_development_dependency "jwt"
   spec.add_development_dependency "rotp"

test/generators/install_generator_test.rb

@@ -63,6 +63,7 @@ class InstallGeneratorTest < Rails::Generators::TestCase
     assert_file "app/misc/rodauth_main.rb", /# accounts_table :users/
 
     assert_file "Gemfile", /gem "bcrypt", "~> 3.1"/
+    assert_file "Gemfile", /gem "tilt", "~> 2.4"/
   end
 
   test "app with --json option" do