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+;;; Haunt --- Static site generator for GNU Guile
+;;; Copyright © 2015 David Thompson <davet@gnu.org>
+;;;
+;;; This file is part of Haunt.
+;;;
+;;; Haunt 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.
+;;;
+;;; Haunt 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 Haunt.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Haunt user interface.
+;;
+;;; Code:
+
+(define-module (haunt ui)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 match)
+  #:export (haunt-main))
+
+(define (show-haunt-help)
+  (format #t "Usage: haunt COMMAND ARGS...
+Run COMMAND with ARGS.~%~%"))
+
+(define (show-haunt-usage)
+  (format #t "Try `haunt --help' for more information.~%")
+  (exit 1))
+
+(define (option? str)
+  (string-prefix? "-" str))
+
+(define* (haunt-main arg0 . args)
+  (match args
+    (()
+     (show-haunt-usage))
+    ((or ("-h") ("--help"))
+     (show-haunt-help))
+    (((? option? opt) _ ...)
+     (format (current-error-port)
+             "haunt: unrecognized option '~a'~%"
+             opt)
+     (show-haunt-usage))))