diff --git a/gem300.rkt b/gem300.rkt
index fa04c6e..9d726a8 100644
--- a/gem300.rkt
+++ b/gem300.rkt
@@ -1,27 +1,51 @@
 #lang racket
 
-(require (prefix-in client: "client.rkt"))
+(require (prefix-in net: "net.rkt")
+         (prefix-in client: "client.rkt"))
 
 (define client (new client:client%))
 
 (define (repl)
   (display "G-300 > ")
 
-  (let ([matches (regexp-match #px"(\\w+)\\s*(.*)" (read-line))])
-    (cond
-      ;; next command. also default
-      [(or (not matches)
-           (string=? (cadr matches) "next")
-           (string=? (cadr matches) "n"))
+  (with-handlers
+    ([(or/c exn:fail:user?
+            ;; todo: catch these errors separately and reformat them
+            ;; in a user-y way
+            exn:fail:network?
+            net:exn:fail:response?)
+      (λ (exn)
+        (displayln (exn-message exn)))])
+
+    (match (regexp-match #px"(\\w+)\\s*(.*)" (read-line))
+      [(or (list _ "go" url)
+           (list _ "g" url))
+       (send client go-cmd url)]
+
+      [(or (list _ "visit" id)
+           (list _ "v" id))
+       (send client visit-cmd (string->number id))]
+
+      [(or (list _ "next" _)
+           (list _ "n" _))
        (send client next-cmd)]
 
-      ;; go command
-      [(or (string=? (cadr matches) "go")
-           (string=? (cadr matches) "g"))
-       (send client go-cmd (caddr matches))]
+      [(or (list _ "url" id)
+           (list _ "u" id))
+       (send client url-cmd (string->number id))]
 
-      ;; visit link command
-      [(andmap char-numeric? (string->list (cadr matches)))
-       (send client visit-cmd (cadr matches))]))
+      [(or (list _ "url")
+           (list _ "u"))
+       (send client url-cmd)]
+
+      [(list _ "up" _)
+       (send client up-cmd)]
+
+      [(or (list _ "back" _)
+           (list _ "b" _))
+       (send client back-cmd)]
+
+      [else
+       (displayln "no such command")]))
 
   (repl))