commit b4ad473f2332525721dd451643228635fbacd968
Author: Vivianne Langdon <puttabutta@gmail.com>
Date:   Mon Jan 29 15:07:18 2024 -0500

    initial commit

diff --git a/goblins-echo.scm b/goblins-echo.scm
new file mode 100644
index 0000000..6205082
--- /dev/null
+++ b/goblins-echo.scm
@@ -0,0 +1,46 @@
+(use-modules (goblins)
+             (goblins vat)
+             (goblins ocapn captp)
+             (goblins ocapn ids)
+             (goblins ocapn netlayer prelay-utils)
+             (goblins ocapn netlayer prelay)
+             (fibers conditions)
+             (ice-9 match))
+
+(define can-quit?
+  (make-condition))
+
+(define echo-vat
+  (spawn-vat #:name "echo-vat"))
+
+(define (^listener bcom)
+  (lambda (text) (format #t "~a\n" text)))
+
+(define (listen setup-sref)
+  (with-vat echo-vat
+   (on (fetch-and-spawn-prelay-netlayer setup-sref)
+       (lambda (netlayer)
+         (define mycapn (spawn-mycapn netlayer))
+         (define listener (spawn ^listener))
+         (define listener-id ($ mycapn 'register listener 'prelay))
+         (format #t "Listener registered at ~s\n" (ocapn-id->string listener-id))))))
+
+(define (say setup-sref listener-sref text)
+  (with-vat echo-vat
+   (on (fetch-and-spawn-prelay-netlayer setup-sref)
+       (lambda (netlayer)
+         (on (<- (<- (spawn-mycapn netlayer) 'enliven listener-sref) text)
+             (lambda (_)
+               (format #t "sent message ~s.\n" text)
+               (signal-condition! can-quit?)))))))
+
+(match (command-line)
+  [(_cmd "listen" setup-id)
+   (listen (string->ocapn-id setup-id))]
+  [(_cmd "say" setup-id listener-id text)
+   (say (string->ocapn-id setup-id) (string->ocapn-id listener-id) text)]
+  [unknown-cmd
+   (format #t "Unknown command ~a\n" unknown-cmd)
+   (signal-condition! can-quit?)])
+
+(wait can-quit?)