Just FYI, I was able to opam install topiary this afternoon without a hitch!
I’m looking forward to tinkering around with customizing the default OCaml query(ies), maybe as an ocamlformat replacement. Are you familiar with any already-extant queries that satisfy particular styles?
(FYI, Topiary Playground is currently erroring for all of the languages except for JSON, which was not the case a few weeks ago.)