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diff --git a/tests/gpgscm/repl.scm b/tests/gpgscm/repl.scm
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+;; A read-evaluate-print-loop for gpgscm.
+;;
+;; Copyright (C) 2016 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG 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.
+;;
+;; GnuPG 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/>.
+
+;; Interactive repl using 'prompt' function.  P must be a function
+;; that given the current entered prefix returns the prompt to
+;; display.
+(define (repl p environment)
+  (call/cc
+   (lambda (exit)
+     (let loop ((prefix ""))
+       (let ((line (prompt (p prefix))))
+	 (if (and (not (eof-object? line)) (= 0 (string-length line)))
+	     (exit (loop prefix)))
+	 (if (not (eof-object? line))
+	     (let* ((next (string-append prefix line))
+		    (c (catch (begin (echo "Parse error:" *error*)
+				     (loop prefix))
+			      (read (open-input-string next)))))
+	       (if (not (eof-object? c))
+		   (begin
+		     (catch (begin
+			      (display (car *error*))
+			      (when (and (cadr *error*)
+					 (not (null? (cadr *error*))))
+				    (display ": ")
+				    (write (cadr *error*)))
+			      (newline)
+			      (vm-history-print (caddr *error*)))
+			    (echo "    ===>" (eval c environment)))
+		     (exit (loop ""))))
+	       (exit (loop next)))))))))
+
+(define (prompt-append-prefix prompt prefix)
+  (string-append prompt (if (> (string-length prefix) 0)
+			    (string-append prefix "...")
+			    "> ")))
+
+;; Default repl run by main.c.
+(define (interactive-repl . environment)
+  (repl (lambda (p) (prompt-append-prefix "gpgscm " p))
+	(if (null? environment) (interaction-environment) (car environment))))
+
+;; Ask a yes/no question.
+(define (prompt-yes-no? question default)
+  (let ((answer (prompt (string-append question "? ["
+				       (if default "Y/n" "y/N") "] "))))
+    (cond
+     ((= 0 (string-length answer))
+      default)
+     ((or (equal? "y" answer) (equal? "Y" answer))
+      #t)
+     (else
+      #f))))