[kijin]

There are a whole bunch of similar tools written in all sorts of languages, and OP just chose what he's most familiar with. It just happened to be different from your favorite toolchain.

It also looks like OP's book was split into several Markdown files, one for each chapter. So he would have needed some sort of build script anyway if he wanted to use texme on the combined document. He would also have needed more than a single line of code in the header, since he wanted some custom styling for blockquotes and code snippets.