1 files changed, 77 insertions, 0 deletions
diff --git a/railties/lib/rails/generators/rails/controller/controller_generator.rb b/railties/lib/rails/generators/rails/controller/controller_generator.rb
new file mode 100644
index 0000000000..eb75e7e661
--- /dev/null
+++ b/railties/lib/rails/generators/rails/controller/controller_generator.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+module Rails
+  module Generators
+    class ControllerGenerator < NamedBase # :nodoc:
+      argument :actions, type: :array, default: [], banner: "action action"
+      class_option :skip_routes, type: :boolean, desc: "Don't add routes to config/routes.rb."
+      class_option :helper, type: :boolean
+      class_option :assets, type: :boolean
+
+      check_class_collision suffix: "Controller"
+
+      def create_controller_files
+        template "controller.rb", File.join("app/controllers", class_path, "#{file_name}_controller.rb")
+      end
+
+      def add_routes
+        return if options[:skip_routes]
+        return if actions.empty?
+        route generate_routing_code
+      end
+
+      hook_for :template_engine, :test_framework, :helper, :assets do |generator|
+        invoke generator, [ remove_possible_suffix(name), actions ]
+      end
+
+      private
+
+        def file_name
+          @_file_name ||= remove_possible_suffix(super)
+        end
+
+        def remove_possible_suffix(name)
+          name.sub(/_?controller$/i, "")
+        end
+
+        # This method creates nested route entry for namespaced resources.
+        # For eg. rails g controller foo/bar/baz index show
+        # Will generate -
+        # namespace :foo do
+        #   namespace :bar do
+        #     get 'baz/index'
+        #     get 'baz/show'
+        #   end
+        # end
+        def generate_routing_code
+          depth = 0
+          lines = []
+
+          # Create 'namespace' ladder
+          # namespace :foo do
+          #   namespace :bar do
+          regular_class_path.each do |ns|
+            lines << indent("namespace :#{ns} do\n", depth * 2)
+            depth += 1
+          end
+
+          # Create route
+          #     get 'baz/index'
+          #     get 'baz/show'
+          actions.each do |action|
+            lines << indent(%{get '#{file_name}/#{action}'\n}, depth * 2)
+          end
+
+          # Create `end` ladder
+          #   end
+          # end
+          until depth.zero?
+            depth -= 1
+            lines << indent("end\n", depth * 2)
+          end
+
+          lines.join
+        end
+    end
+  end
+end