#| -*-Scheme-*-

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    2017, 2018, 2019, 2020, 2021, 2022 Massachusetts Institute of
    Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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.

MIT/GNU Scheme 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 MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

(declare (usual-integrations))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; This file contains Scheme code to define a set of load options.  Each
;; time a new (not-yet-loaded) load option is requested, this file is
;; loaded into a fresh environment which has the system global
;; environment as parent.
;;
;; Procedures used for defining load options:
;;
;; (DEFINE-LOAD-OPTION 'NAME loader loader ...)
;;   Defines a load option (NAME) which is loaded by the execution of its
;;   loaders.  Loaders are executed left to right.  Loaders are thunks.
;;
;; (STANDARD-OPTION-LOADER 'PACKAGE-NAME 'EXPR file file ...)
;;   Creates a loader that loads the files (strings relative to
;;   $MITSCHEME_LIBRARY_PATH/runtime/) into the environment of the
;;   package named PACKAGE-NAME, and then evaluates EXPR in that load
;;   environment. If EXPR is #F of course evaluating it has no effect.
;;
;; (FURTHER-LOAD-OPTIONS EXPR)
;;   EXPR is the place to look next for the load options.  Useful objects
;;   are #T (load options supplied in the next optiondb file in the
;;   library directory path), STANDARD-LOAD-OPTIONS (those supplied with
;;   the MIT-Scheme distribution) and LOCAL-LOAD-OPTIONS (those supplied
;;   for every user of your architecture at your site).  If not
;;   specified, or is #F, then this file is the last options database
;;   that is searched.

;; Standard load options are defined like this:

(define-load-option 'arithmetic-interface
  (standard-option-loader '(runtime number interface) #f "numint"))

;; We can use programming to make the definitions less noisy and tedious:

(for-each
 (lambda (spec)
   (define-load-option (car spec) (apply standard-option-loader (cdr spec))))
 '((compress	(runtime compress)	#f			"cpress")
   (format	(runtime format)	(initialize-package!)	"format")
   (mime-codec	(runtime mime-codec)	#f			"mime-codec")
   (ordered-vector (runtime ordered-vector) #f			"ordvec")
   (stepper	(runtime stepper)	#f			"ystep")
   (subprocess	(runtime subprocess)	(initialize-package!)	"process")
   (synchronous-subprocess (runtime synchronous-subprocess) #f	"syncproc")
   ))

(define-load-option 'regular-expression
  (standard-option-loader '(runtime regular-expression-compiler)
			  #f
			  "rgxcmp")
  (standard-option-loader '(runtime char-syntax)
			  '(initialize-package!)
			  "chrsyn")
  (standard-option-loader '(runtime regular-expression)
			  #f
			  "regexp")
  (standard-option-loader '(runtime rexp)
			  #f
			  "rexp"))

;; HASH-TABLE is now always loaded.
(define-load-option 'hash-table dummy-option-loader)
(define-load-option 'rb-tree dummy-option-loader)
(define-load-option 'wt-tree dummy-option-loader)