#| -*-Scheme-*-

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
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    2017, 2018, 2019 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

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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
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WITHOUT ANY WARRANTY; without even the implied warranty of
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General Public License for more details.

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|#

;;;; Edwin Pathnames

(declare (usual-integrations))

(define (edwin-library-directory-pathname envvar required?)
  (let ((envval (get-environment-variable envvar)))
    (if envval
	(pathname-as-directory (merge-pathnames envval))
	(or (system-library-directory-pathname "edwin")
	    (and required?
		 (error "Can't find edwin library directory."))))))

(define (edwin-binary-directory)
  (edwin-library-directory-pathname "EDWIN_BINARY_DIRECTORY" #t))

(define (edwin-info-directory)
  (let ((pathname
	 (edwin-library-directory-pathname "EDWIN_INFO_DIRECTORY" #f)))
    (and pathname
	 (merge-pathnames "info" (pathname-as-directory pathname)))))

(define (edwin-etc-directory)
  (edwin-library-directory-pathname "EDWIN_ETC_DIRECTORY" #t))

(define (edwin-etc-pathname filename)
  (let ((pathname (merge-pathnames filename (edwin-etc-directory))))
    (if (not (file-exists? pathname))
	(error "Unable to find file:" (->namestring pathname)))
    pathname))

(define (edwin-tutorial-pathname)
  (edwin-etc-pathname "TUTORIAL"))

(define default-homedir-pathname
  ;; This binding exists to allow uses of the "home" directory as a
  ;; default directory to be overridden.
  user-homedir-pathname)