Shakepeare SASS is a package to enable the usage of SASS language in the Yesod web framework.
Adding SASS support to your Yesod website is, actually,
quite simple and straight-forward.
After adding shakespeare-sass into your .cabal file
(and stack.yaml if you are using stack),
all you have to do is change your widgetFileSettings in Settings.hs
from = def to = wfsSass ["sass_include/"].
And, of course, import Text.Shakespeare.Sass at the beginning of the file.
The argument for wfsSass function is a list of directories relative to
the project root where you want
your .sass or .scss include files stored.
The main SASS files will still reside in your templates directory,
as it is with the default setup with .lucius files.
That way you get to keep your mixins separate from the templates
and have a clear directory structure.
Of course, you can always add your templates directory
to sass search path and keep everything in templates dir.
In case you are using Keter for deployment
(and you should, it's a great tool),
you should also add directories with your sass templates
to the extraFiles: list in the config/keter.yaml file.
Don't forget to put the ../ prefix, since keter.yaml's paths are
relative to the config directory.