# File rails/actionmailer/lib/rails/generators/mailer/mailer_generator.rb, line 12
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

# File rails/actionmailer/lib/rails/generators/mailer/mailer_generator.rb, line 25
def file_name # :doc:
  @_file_name ||= super.sub(/_mailer\z/i, "")
end