implement very primitive REPL

gem300.rkt

@@ -41,3 +41,27 @@
 
             [else
              (values (string->number status) meta)])))))
+
+(define commands
+  (list
+   (cons "default" (lambda (line) (void)))
+   (cons "go" (lambda (line)
+                (request line)))))
+
+(define (dispatch-command line)
+  (let ([split (string-split line " ")])
+
+    (let ([cmd (assoc (cond [(null? split) "default"]
+                            [else (first split)])
+                      commands)])
+      (if cmd
+          ((cdr cmd) (string-join (cdr split)))
+          (displayln "no such command")))))
+
+
+(define (repl)
+  (display "G300> ")
+  (dispatch-command (read-line))
+  (repl))
+
+(repl)