;;; compile-file-pathname.lisp
;;;
;;; Copyright (C) 2004-2005 Peter Graves
;;; $Id$
;;;
;;; This program 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 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program 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.
;;;
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;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
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(in-package #:system)

(defun compile-file-pathname (input-file &key output-file &allow-other-keys)
  (let ((defaults (make-pathname :type *compile-file-type*
                                 :defaults (merge-pathnames input-file))))
    (cond ((null output-file) defaults)
          (t (let ((computed-file-pathname (merge-pathnames output-file defaults)))
               (if (equal (pathname-directory computed-file-pathname)
                          (pathname-directory (make-pathname :defaults input-file)))
                   computed-file-pathname
                   (merge-pathnames output-file *default-pathname-defaults*)))))))