- Some of us are loath to promote macOS, and that includes using it in decorational elements. Any chance that you'll add other window decoration styles?

- There's not a lot of languages listed; I wasn't able to find D (which didn't surprise me) or C++ (which did surprise me). I don't know what you're using now for syntax highlighting, but something like prismjs.com could easily add dozens of languages to your supported list.

I do like the looks of this project; keep it up!