Clojurians Log v2

How can I configure a custom REPL prompt for REPL started via clojure cli / deps.edn, in a non-hacky way? • I want it to print (project-name) user=>, instead of just user=>, , ◦ while keeping the standard user.clj load behaviour ◦ and, I don't want to switch to a custom ns matching the project name • I use CIDER and nrepl middleware ◦ I can't figure out how to configure the prompt via project-local .nrepl.el ◦ Is there a :repl-options config for clojure CLI? https://github.com/clojure-emacs/cider-nrepl/blob/v0.52.0/doc/modules/ROOT/pages/usage.adoc ◦ Any undocumented way to send prompt function to nrepl.cmdline? This logic seems to be the key to my requirement: https://github.com/nrepl/nrepl/blob/0d78e7144b260d9c7ff905d890bc668f847a741a/src/clojure/nrepl/cmdline.clj#L382 • I don't want to start a sub-repl. ◦ Custom prompt is possible to do via user.clj (clojure.main/repl :prompt my-custom-prompt-fn) ▪︎ BUT it starts a sub-REPL, and that in turn seems to mess up CIDER's REPL startup. ▪︎ I think so, because it prevents me from using unix domain file sockets. • I definitely don't want to write a custom REPL client (non-standard tooling defeats the purpose of my current project). My hack is: Pass in a custom --repl-fn via my :cider alias in deps.edn.

:cider {;; clj -M:dev:cider
        :extra-deps {cider/cider-nrepl {:mvn/version "0.50.2"}
                     refactor-nrepl/refactor-nrepl {:mvn/version "3.9.1"}}
        :main-opts ["-m" "nrepl.cmdline"
                    "--middleware"
                    "[cider.nrepl/cider-middleware,refactor-nrepl.middleware/wrap-refactor]"
                    "--repl-fn" "user/run-repl"
                    "--interactive"]}

(defn multiproject-repl-prompt
  [_]
  (let [project-alias (or (System/getenv "CLJ_MULTIPROJECT_ALIAS")
                          "none specified")]
    (printf "(project alias: %s) \n  %s=> "
            project-alias
            (ns-name *ns*))))

(defn run-repl
  ([{:keys [server options] :as repl-ctx}]

   ;; The hack: :prompt injection (hehe :)) into nrepl.cmdline's private `run-repl`.

   (#'nrepl.cmdline/run-repl (assoc-in repl-ctx
                                       [:options :prompt]
                                       multiproject-repl-prompt)))
  ([host port]
   (run-repl host port nil))
  ([host port options]
   (run-repl {:server  (cond-> {}
                         host (assoc :host host)
                         port (assoc :port port))
              :options options})))

Greetings, CIDER connoisseurs! There's an exciting new feature waiting for you in the latest MELPA build. After updating, try turning on the new variable cider-download-java-sources (`M-x customize-variable cider-download-java-sources` and then toggle to enable it). Now, CIDER will download Java sources of third-party libraries for Java classes when you request documentation for a class or a method (`C-c C-d C-d` ) or jump to its definition (`M-.`). This feature works without enrich-classpath. The downloading should work for both tools.deps and Leiningen-based projects. In all cases, it starts a subprocess of either clojure or lein binary (this is the same approach that Clojure's 1.12 add-lib utilizes). This should work well for most cases. You might have problems downloading the sources of dependencies that are not public (i.e. they live in a private repo), and the credentials are non-global but under some specific alias/profile that you start REPL with. If this happens to you, please report it; but I suspect such cases would be rare. The download usually takes up to a few seconds, and then the downloaded artifact will be reused by all projects. If download failed (most often, because the library didn't publish the -sources.jar artifact to Maven), CIDER will not attempt to download it again until REPL restarts. Try it out in any project by e.g. jumping to clojure.lang.RT/toArray or bringing up the docs for clojure.lang.PersistentArrayMap.