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;;; Sly
;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Cooperative REPL server extension.
;;
;;; Code:
(define-module (sly repl)
#:use-module (system repl coop-server)
#:use-module (system repl server)
#:use-module (sly agenda)
#:use-module (sly game)
#:export (start-sly-repl
resume-game-loop))
(define* (start-sly-repl #:optional (port (make-tcp-server-socket #:port 37146)))
"Start a cooperative REPL server that listens on the given PORT. By
default, this port is 37146. Additionally, a process is scheduled to
poll the REPL server upon every tick of the game loop."
(let ((server (spawn-coop-repl-server port))
(error-agenda (make-agenda)))
(schedule-each
(lambda ()
(poll-coop-repl-server server)))
;; Pause game and handle errors when they occur.
(add-hook! after-game-loop-error-hook
(lambda ()
(call-with-prompt
'sly-repl-error-prompt
(lambda ()
(with-agenda error-agenda
(while #t
(poll-coop-repl-server server)
(agenda-tick!)
(usleep 10))))
(lambda (cont)
;; Discard the continuation
#f))))))
(define (resume-game-loop)
"Abort from the error handling loop prompt and resume the game
loop."
;; We need to use the agenda so that the prompt is not aborted
;; within the REPL, which would break the client session.
(schedule
(lambda ()
(abort-to-prompt 'sly-repl-error-prompt))))
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