1 files changed, 38 insertions, 0 deletions
diff --git a/actionmailer/lib/rails/generators/mailer/mailer_generator.rb b/actionmailer/lib/rails/generators/mailer/mailer_generator.rb
new file mode 100644
index 0000000000..c37a74c762
--- /dev/null
+++ b/actionmailer/lib/rails/generators/mailer/mailer_generator.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+module Rails
+  module Generators
+    class MailerGenerator < NamedBase
+      source_root File.expand_path("templates", __dir__)
+
+      argument :actions, type: :array, default: [], banner: "method method"
+
+      check_class_collision suffix: "Mailer"
+
+      def create_mailer_file
+        template "mailer.rb", File.join("app/mailers", class_path, "#{file_name}_mailer.rb")
+
+        in_root do
+          if behavior == :invoke && !File.exist?(application_mailer_file_name)
+            template "application_mailer.rb", application_mailer_file_name
+          end
+        end
+      end
+
+      hook_for :template_engine, :test_framework
+
+      private
+        def file_name # :doc:
+          @_file_name ||= super.sub(/_mailer\z/i, "")
+        end
+
+        def application_mailer_file_name
+          @_application_mailer_file_name ||= if mountable_engine?
+            "app/mailers/#{namespaced_path}/application_mailer.rb"
+          else
+            "app/mailers/application_mailer.rb"
+          end
+        end
+    end
+  end
+end