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#! /usr/bin/env scheme-script
;; -*- mode: scheme -*-
;;
;; Copyright 2016 Aldo Nicolas Bruno
;;
;; Licensed under the Apache License, Version 2.0 (the "License");
;; you may not use this file except in compliance with the License.
;; You may obtain a copy of the License at
;;
;;     http://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing, software
;; distributed under the License is distributed on an "AS IS" BASIS,
;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;; See the License for the specific language governing permissions and
;; limitations under the License.

; example of remote REPL
; you can use any transport, tcp:// ipc:// websocket inproc
; see http://nanomsg.org/v1.0.0/nanomsg.7.html
; and nanomsg.sls for details
;
; ./local-repl tcp://127.0.0.1:12345
; ABC
;
; meanwhile in another terminal...
; ./remote-repl tcp://127.0.0.1:12345
; > (+ 1 2)
; 3
; > (printf "ABC~n") --> will print ABC on the local repl process
;
; The nice thing is that you can scale to any protocol and
; that it can be integrated in an event/main loop
; it uses non-blocking (read) and you invoke (my-local-repl) until => #f
;
; TODO: add a command for local exit. #!eof object will only close the remote 
; connection....

#!chezscheme

(import (chezscheme) (nanomsg))
(nanomsg-library-init)

(define argv (command-line-arguments))

(define sock (nn-socket AF_SP NN_REQ))
(define eid (cond [(null? argv)
		   (nn-connect sock "tcp://localhost:9888")]
		  [else
		   (nn-connect sock (car argv))]))

(call/cc 
 (lambda (return)
   (let loop ()
     (guard 
      (e (else (printf "error in remote-repl: on ~d: ~d with irritants ~d~n" 
		       (if (who-condition? e) (condition-who e) 'unknown)
		       (if (message-condition? e) (condition-message e) "")
		       (if (irritants-condition? e) (condition-irritants e) ""))))
      (printf "> ")
      (nn-send sock (string->utf8 
		     (call-with-string-output-port
		      (lambda (p)
			(let ([token (read)])
			  (if (eof-object? token)
			      (return #f)
			      (write token p)))))) 0)
      (let ([buf (box #t)])
	(nn-recv sock buf NN_MSG 0)
	(let ([s (utf8->string (unbox buf))])
	  (printf "~d" (if (string=? "#<void>\n" s) "" s)))))
     (loop))))