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+;; gitto -- Keep track of your git repositories
+;; Copyright (C) 2012 Tom Willemse <tom at ryuslash dot org>
+
+;; This file is part of gitto.
+
+;; gitto 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.
+
+;; gitto 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 gitto.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gitto ui)
+  #:use-module (ice-9 rdelim)
+  #:export (y-or-n?))
+
+(define* (y-or-n? prompt #:key (default #f))
+  (format #t "~a [~a] " prompt (if default "Y/n" "y/N"))
+  (let ((char (read-char)))
+
+    ;; Clear the rest of the input buffer.
+    (unless (eq? char #\newline)
+      (read-line))
+
+    (case char
+      ((#\y #\Y #\newline) #t)
+      ((#\n #\N) #f)
+      (else
+       (display "Invalid response, please use `y' or `n'.")
+       (newline)
+       (y-or-n? prompt #:default default)))))