:style/indent is broken when using Babashka nREPL

[edenworky]

Expected behavior

Given the function (defn foo {:style/indent 1} [& args]), the code (foo a a) should be indented (e.g. by prog-indent-sexp) as:

(foo a
  a)

As specified in the documentation and as currently works in the default (non-Babashka) nRepl.

Actual behavior

Only when I use a Babashka REPL (automatically, by having a bb.edn file), all the code works, but the statement gets indented as:

(foo a
     a)

Moreover, if foo is a macro instead, it doesn't even get the macro fontface, only under a Babashka nrepl.

Steps to reproduce the problem

Paste into a clojure file:

(defn foo {:style/indent 1} [& args])
(foo a
  a)

Jack into a non-Babashka REPL, move your cursor to the end of the last expression and reindent using C-M-q, and observe that it doesn't change. Close the repl session and jack into a Babashka REPL (e.g. by adding a bb.edn file containing {} near the clojure file), reindent the last expression and observe it indents incorrectly as shown above.

Environment & Version information

CIDER version information

For default (non-Babashka) REPL:

;; CIDER 1.20.0 (Lanzarote), nREPL 1.5.1
;; Clojure 1.12.3, Java 24.0.2

For Babashka REPL:

;; CIDER 1.20.0 (Lanzarote), babashka.nrepl 0.0.6-SNAPSHOT
;; Babashka 1.12.209

Lein / Clojure CLI version

Clojure CLI version 1.12.3.1577

Emacs version

GNU Emacs 30.2

Operating system

A recent EndevourOS (Arch linux)

JDK distribution

java version "24.0.2" 2025-07-15
Java(TM) SE Runtime Environment (build 24.0.2+12-54)
Java HotSpot(TM) 64-Bit Server VM (build 24.0.2+12-54, mixed mode, sharing)

[edenworky]

Ok, I found a potential culprit. I've also been getting, just in the Babashka REPL, a warning WARNING: Can't determine Clojure version. The refactor-nrepl middleware requires clojure 1.8.0 (or newer)WARNING: No Clojure project was detected. The refactor-nrepl middleware was not enabled. (You can mute this warning by customizing cljr-suppress-no-project-warning'.)`.

I looked thru loaded the code and managed to find in cider-connection.el:

(defun cider--clojure-version ()
  "Retrieve the underlying connection's Clojure version."
  (with-current-buffer (cider-current-repl)
    (when nrepl-versions
      (thread-first nrepl-versions
                    (nrepl-dict-get "clojure")
                    (nrepl-dict-get "version-string")))))

But when I go to the REPL buffer and run M-: nrepl-versions, I get, rather than a dict with a key "clojure" with a dict with a key "version-string", the following:

(dict "babashka" "1.12.209" "babashka.nrepl" "0.0.6-SNAPSHOT")

[github-actions]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed soon if no further activity occurs. Thank you for your contribution and understanding!