From 13c70844ee8d54778569298bc0a6867b7cda0c37 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Thu, 9 Jan 2014 19:11:09 -0500
Subject: Factor REPL out of main loop.

* 2d/game.scm (start-game-loop): Don't spawn REPL.
(update-and-render, tick): Don't run REPL.
(run-repl-thunk, run-repl): Move.

* 2d/repl/repl.scm: (run-repl-thunk, flush-repl): Add.
(flush-repl): Schedule REPL to be run within main loop.
---
 2d/repl/repl.scm | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

(limited to '2d/repl')

diff --git a/2d/repl/repl.scm b/2d/repl/repl.scm
index df0b8fe..6b0a69b 100644
--- a/2d/repl/repl.scm
+++ b/2d/repl/repl.scm
@@ -29,9 +29,14 @@
   #:use-module (system repl common)
   #:use-module (system repl command)
   #:use-module (ice-9 control)
-  #:use-module (2d mvars)
+  #:use-module (srfi srfi-2)
+  #:use-module (2d agenda)
   #:use-module (2d game)
-  #:export (repl-input-mvar repl-output-mvar start-repl run-repl))
+  #:use-module (2d mvars)
+  #:export (repl-input-mvar
+            repl-output-mvar
+            start-repl
+            run-repl))
 
 
 ;;;
@@ -127,12 +132,38 @@
 
 
 ;;;
-;;; The repl
+;;; guile-2d REPL stuff
 ;;;
 
 (define repl-input-mvar  (new-empty-mvar))
 (define repl-output-mvar (new-empty-mvar))
 
+(define (run-repl-thunk thunk input output error stack)
+  "Run THUNK with the given REPL STACK. I/O is redirected to the given
+INPUT, OUTPUT, and ERROR ports."
+  (put-mvar
+   repl-output-mvar
+   (with-input-from-port input
+     (lambda ()
+       (with-output-to-port output
+         (lambda ()
+           (with-error-to-port error
+             (lambda ()
+               (with-fluids ((*repl-stack* stack))
+                 (thunk))))))))))
+
+(define (flush-repl)
+  "Execute a thunk from the REPL is there is one."
+  (unless (mvar-empty? repl-input-mvar)
+    (and-let* ((vals (try-take-mvar repl-input-mvar)))
+              (apply run-repl-thunk vals))))
+
+(schedule-interval flush-repl 5)
+
+;;;
+;;; The repl
+;;;
+
 (define* (start-repl #:optional (lang (current-language)) #:key debug)
   ;; ,language at the REPL will update the current-language.  Make
   ;; sure that it does so in a new dynamic scope.
-- 
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