;;; "guile.init" configuration template of *features* for Scheme -*-scheme-*-
;;; Author: Aubrey Jaffer
;;;
;;; This code is in the public domain.

;;; (software-type) should be set to the generic operating system type.
;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.

(define (software-type) 'UNIX)

;;; (scheme-implementation-type) should return the name of the scheme
;;; implementation loading this file.

(define (scheme-implementation-type) 'Guile)

;;; (scheme-implementation-home-page) should return a (string) URI
;;; (Uniform Resource Identifier) for this scheme implementation's home
;;; page; or false if there isn't one.

(define (scheme-implementation-home-page) "http://www.gnu.org/software/guile/")

;;; (scheme-implementation-version) should return a string describing
;;; the version the scheme implementation loading this file.

(define scheme-implementation-version version)

;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxillary files to your Scheme
;;; implementation reside.

(define implementation-vicinity
  (let ((path (string-append (%package-data-dir) "/")))
    (lambda () path)))

;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.

(define library-vicinity
  (let ((library-path
	 (or
	  ;; Use this getenv if your implementation supports it.
	  (getenv "SCHEME_LIBRARY_PATH")
	  ;; Use this path if your scheme does not support GETENV
	  ;; or if SCHEME_LIBRARY_PATH is not set.
	  (let ((this-file (port-filename (current-load-port))))
	    (substring this-file 0 (- (string-length this-file) 10))))))
    (lambda () library-path)))

;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.

(define home-vicinity
  (let ((home-path (getenv "HOME")))
    (lambda () home-path)))

;;; *FEATURES* should be set to a list of symbols describing features
;;; of this implementation.  Suggestions for features are:

(define *features*
      '(
	source				;can load scheme source files
					;(slib:load-source "filename")
	compiled			;can load compiled files
					;(slib:load-compiled "filename")
	rev4-report			;conforms to
	rev3-report			;conforms to
	ieee-p1178			;conforms to
;	sicp				;runs code from Structure and
					;Interpretation of Computer
					;Programs by Abelson and Sussman.
	rev4-optional-procedures	;LIST-TAIL, STRING->LIST,
					;LIST->STRING, STRING-COPY,
					;STRING-FILL!, LIST->VECTOR,
					;VECTOR->LIST, and VECTOR-FILL!
	rev2-procedures			;SUBSTRING-MOVE-LEFT!,
					;SUBSTRING-MOVE-RIGHT!,
					;SUBSTRING-FILL!,
					;STRING-NULL?, APPEND!, 1+,
					;-1+, <?, <=?, =?, >?, >=?
	multiarg/and-			;/ and - can take more than 2 args.
	multiarg-apply			;APPLY can take more than 2 args.
;	rationalize
	delay				;has DELAY and FORCE
	with-file			;has WITH-INPUT-FROM-FILE and
					;WITH-OUTPUT-FROM-FILE
	string-port			;has CALL-WITH-INPUT-STRING and
					;CALL-WITH-OUTPUT-STRING
;	transcript			;TRANSCRIPT-ON and TRANSCRIPT-OFF
	char-ready?
;	macro				;has R4RS high level macros
;	macro-by-example
	defmacro			;has Common Lisp DEFMACRO
	eval				;R5RS two-argument eval
	record				;has user defined data structures
	values				;proposed multiple values
	dynamic-wind			;proposed dynamic-wind
	ieee-floating-point		;conforms to
	full-continuation		;can return multiple times
;	object-hash			;has OBJECT-HASH

	sort
;	queue				;queues
;	pretty-print
	object->string
;	format
;	trace				;has macros: TRACE and UNTRACE
;	compiler			;has (COMPILER)
;	ed				;(ED) is editor
	system				;posix (system <string>)
	getenv				;posix (getenv <string>)
	program-arguments		;returns list of strings (argv)
;	Xwindows			;X support
;	curses				;screen management package
;	termcap				;terminal description package
;	terminfo			;sysV terminal description
	current-time			;returns time in seconds since 1/1/1970

	abort
	array
	array-for-each
	random
	hash
	hash-table
	line-i/o
	logical
	promise
	string-case
;	syntax-case
	))

;; time
(define difftime -)
(define offset-time +)

;; random
(define (make-random-state . args)
  (let ((seed (if (null? args) *random-state* (car args))))
    (cond ((string? seed))
	  ((number? seed) (set! seed (number->string seed)))
	  (else (let ()
		  (require 'object->string)
		  (set! seed (object->limited-string seed 50)))))
    (seed->random-state seed)))

;;; (OUTPUT-PORT-WIDTH <port>)
(define (output-port-width . arg) 79)

;;; (OUTPUT-PORT-HEIGHT <port>)
(define (output-port-height . arg) 24)

;;; "rationalize" adjunct procedures.
;;(define (find-ratio x e)
;;  (let ((rat (rationalize x e)))
;;    (list (numerator rat) (denominator rat))))
;;(define (find-ratio-between x y)
;;  (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))

;;; Return argument
(define (identity x) x)

;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define (slib:eval x)
  (eval x (interaction-environment)))

(define base:eval slib:eval)
(define (defmacro:eval x) (base:eval (defmacro:expand* x)))
(define (defmacro:expand* x)
  (require 'defmacroexpand) (apply defmacro:expand* x '()))

(define (slib:eval-load <pathname> evl)
  (if (not (file-exists? <pathname>))
      (set! <pathname> (string-append <pathname> (scheme-file-suffix))))
  (call-with-input-file <pathname>
    (lambda (port)
      (let ((old-load-pathname *load-pathname*))
	(set! *load-pathname* <pathname>)
	(do ((o (read port) (read port)))
	    ((eof-object? o))
	  (evl o))
	(set! *load-pathname* old-load-pathname)))))

(define (defmacro:load <pathname>)
  (slib:eval-load <pathname> defmacro:eval))

(define slib:warn
  (lambda args
    (let ((cep (current-error-port)))
      (if (provided? 'trace) (print-call-stack cep))
      (display "Warn: " cep)
      (for-each (lambda (x) (display x cep)) args))))

;;; define an error procedure for the library
(define (slib:error . args)
  (if (provided? 'trace) (print-call-stack (current-error-port)))
  (apply error args))

;;; define these as appropriate for your system.
(define slib:tab (integer->char 9))
(define slib:form-feed (integer->char 12))

;;; Support for older versions of Scheme.  Not enough code for its own file.
(define t #t)
(define nil #f)

;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exitting not supported.
(define slib:exit quit)

;;; Here for backward compatability
(define scheme-file-suffix
  (let ((suffix (case (software-type)
		  ((NOSVE) "_scm")
		  (else ".scm"))))
    (lambda () suffix)))

;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
;;; suffix all the module files in SLIB have.  See feature 'SOURCE.

(define (slib:load-source f) (load (string-append f (scheme-file-suffix))))

;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
;;; by compiling "foo.scm" if this implementation can compile files.
;;; See feature 'COMPILED.

(define (slib:load-compiled f) (load-compiled-file (string-append f ".go")))

;;; At this point SLIB:LOAD must be able to load SLIB files.

(define slib:load slib:load)

(slib:load (in-vicinity (library-vicinity) "require"))