stack-templatizer is an application that generates a .hsfiles stack template from a folder of template files. You can install the application using stack install stack-templatizer --resolver nightly or by cloning the repository and running stack install. Then run stack-templatizer my-folder to turn all the files in my-folder into a my-folder.hsfiles stack template. You can see an example folder & the generated hs-files in the hpack template repository.