[btbytes]

You don't have to override the template in the lua code to include the mvp.css file. use --css argument to set the location of the css file. it can even take multiple arguments (one for mvp.css and one for chartss.css).

In the current state, your "function Doc(" block upsets existing pandoc workflows.

Edit: didn't want to sound harsh with only the criticism :) Thank you for showing how to use lua-filters to do really cool stuff. I've playing with lua-filters, but your code is a clear example of how to extend markdown with a mini-DSL.

Edit 2: Sent you a PR on github with what I was suggesting here.