USE THIS WITH PRECAUTION! At your own risk!
I wrote this little command line so I can use Mustache inside my text.md which is used by (among other things) Deckset.
The code really does output.write(toFile: "text.md"), so again, you are WARNED!
That being said, I love to just edit my template.md, use things like {{>code01.md}} and boom, the partial gets included.
With all the warnings, I still have to invoke ./mus inside of the Bundle, where I put a copy of this command line tool, because I didn't want to spend more time for now to make this more of a general tool.
I'm also looking at the info.json which is most probably there with your Deckset textbundle and if it, I'm using any of the Keys there which you can render in {{mustache}}. Use it for things like Colors, transitions, and alike.