display values instead of vars

[viebel]

Is there a way to config rebel-readline so that it displays values instead of var when evaluating a def form?

Currently it works like this:

user=> (def abc 42)
#'user/abc

Would it be possible to make it work like that:

user=> (def abc 42)
42

The reason I am asking for this feature is that it is a bit hard for Clojure beginners to understand the concepts of var. Displaying values instead of vars will make rebel-readline more beginner friendly.

[bhauman]

I can understand this but the var is the value that is returned by the expression.

We wouldn't want folks to think they can do this (def a (def b 2)).

That being said you should be able to configure rebel-readline to print the final value however you want. Rebel-readline offers an api that you can use to compose the REPL experience that you want.

If you want to be able to specify say a middleware that filters values before they are printed in the .rebel-readline config file that might be an interesting configuration point.

It would be interesting to support pretty printing this way as well.

I would need to look back into it and see if there is a good pattern that expresses this kind of customization.

On Thu, Sep 27, 2018 at 1:04 AM Yehonathan Sharvit notifications@github.com wrote:

Is there a way to config rebel-readline so that it displays values instead of var when evaluating a def form?

Currently it works like this:

user=> (def abc 42)

'user/abc

Would it be possible to make it work like that:

user=> (def abc 42)42

The reason I am asking for this feature is that it is a bit hard for Clojure beginners to understand the concepts of var. Displaying values instead of vars will make rebel-readline more beginner friendly.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/bhauman/rebel-readline/issues/178, or mute the thread https://github.com/notifications/unsubscribe-auth/AAAKQCCCN9tkqC0yk_P4laPc4DZdOS0nks5ufFx6gaJpZM4W76kg .

[viebel]

I happened to create my own repl with the following code:

Is this what you meant?

(ns klipse-repl.main
  (:require
   [rebel-readline.core :refer [with-readline-in]]
   [rebel-readline.clojure.line-reader :as line-reader]
   [rebel-readline.clojure.service.local :as rebel-service]
   [clojure.main :as clojure-main]))

 (defn custom-eval [x]
    (let [res (eval x)]
      (if (seq? x)
        (cond
          (= 'def (first x)) @res
          (= 'defn (first x)) (symbol (str "Function " (:name (meta res)) " created"))
          :else res)
        res)))

(defn -main []
  (with-readline-in
    (line-reader/create
     (rebel-service/create))
    (clojure-main/repl
     :init (fn [] (println "klipse-repl"))
     :eval custom-eval
     :prompt (fn []))))

[bhauman]

Yeah that works! I realized after I sent the email that this is the only way for you to do this because you have to know what was evaluated.

[viebel]

Cool!