Use try plus finally for the cp command

This makes it much more explicit that the channel needs to be closed
when the rest of the code is done executing. In reality this is still
just a proof of concept on how to use the internal socket repl to get a
result back to the plugin, but better a good example. ;-)

Author: mdiin

src/socket_repl/socket_repl_plugin.clj

@@ -219,18 +219,18 @@
         plugin
         (fn [msg]
           (let [code-form "(map #(.getAbsolutePath %) (clojure.java.classpath/classpath))"]
-            (log/info msg)
             (async/>!! (socket-repl/input-channel internal-socket-repl)
                        code-form)
-            (log/info "I'm in!")
             (async/thread
               (let [res-chan (async/chan 1 (filter #(= (:form %) code-form)))]
-                (socket-repl/subscribe-output internal-socket-repl res-chan)
-                (let [res (async/<!! res-chan)]
-                  (log/info (:ns res))
-                  (log/info (:ms res))
-                  (log/info (:val res))
-                  (.close res-chan))))))))
+                (try
+                  (socket-repl/subscribe-output internal-socket-repl res-chan)
+                  (let [res (async/<!! res-chan)]
+                    (log/info (:ns res))
+                    (log/info (:ms res))
+                    (log/info (:val res)))
+                  (finally
+                    (.close res-chan)))))))))
 
     (nvim/register-method!
       nvim