README

README.md

@@ -714,19 +714,22 @@ This can be useful for talking to Docker:
 
 Babashka comes with the [nrepl/bencode](https://github.com/nrepl/bencode)
 library which allows you to read and write bencode messages to a socket. A
-simple example which gets the Clojure version from an nREPL server started with
-`lein repl`:
+simple example which evaluates a Clojure expression on an nREPL server started
+with `lein repl`:
 
 ``` clojure
 (ns nrepl-client
   (:require [bencode.core :as b]))
 
-(let [s (java.net.Socket. "localhost" 65274)
-      out (.getOutputStream s)
-      in (java.io.PushbackInputStream. (.getInputStream s))
-      _ (b/write-bencode out {"op" "describe"})
-      clojure-version (get-in (b/read-bencode in) ["versions" "clojure" "version-string"])]
-  (String. clojure-version "UTF-8")) ;;=> "1.10.0"
+(defn nrepl-eval [port expr]
+  (let [s (java.net.Socket. "localhost" port)
+        out (.getOutputStream s)
+        in (java.io.PushbackInputStream. (.getInputStream s))
+        _ (b/write-bencode out {"op" "eval" "code" (pr-str expr)})
+        value (get (b/read-bencode in) "value")]
+    (read-string value)))
+
+(nrepl-eval 65274 '(+ 1 2 3)) ;;=> 6
 ```