aboutsummaryrefslogtreecommitdiffstats
path: root/gambit.init
blob: d50edaefa99f79713470f7a358f2290ef610c28c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
;;;"gambit.init" Initialization for SLIB for Gambit	-*-scheme-*-
;;; Author: Aubrey Jaffer
;;;
;;; This code is in the public domain.

;;; Updated 1992 February 1 for Gambit v1.71 -- by Ken Dickey
;;; Date: Wed, 12 Jan 1994 15:03:12 -0500
;;; From: barnett@armadillo.urich.edu (Lewis Barnett)
;;; Relative pathnames for Slib in MacGambit
;;; Hacked yet again for Gambit v2.4, Jan 1997, by Mike Pope
;;; Updated for Gambit v3.0, 2001-01 AGJ.

;;; gsi should be invoked with -:s option to Ignore case when reading
;;; symbols (per R5RS).

(define (software-type) 'MACOS)		; for MacGambit.
(define (software-type) 'UNIX)		; for Unix platforms.

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

;;; (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.iro.umontreal.ca/~gambit/index.html")

(define (scheme-implementation-version) (system-version-string))

(define getenv
  (let ((ge getenv))
    (lambda (str) (ge str #f))))

;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxillary files to your Scheme
;;; implementation reside.
(define implementation-vicinity
  (case (software-type)
    ((UNIX)	(lambda () "/usr/local/share/gambc/"))
    ((VMS)	(lambda () "scheme$src:"))
    ((MS-DOS)	(lambda () "C:\\scheme\\"))
    ((WINDOWS)  (lambda () "c:/scheme/"))
    ((MACOS)
     (let ((arg0 (list-ref (argv) 0)))
       (let loop ((i (- (string-length arg0) 1)))
	 (cond ((negative? i) "")
	       ((char=? #\: (string-ref arg0 i))
		(set! arg0 (substring arg0 0 (+ i 1)))
		(lambda () arg0))
	       (else (loop (- i 1)))))))))

;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.
;;;
;;; This assumes that the slib files are in a folder
;;; called slib in the same directory as the MacGambit Interpreter.
(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.
	  (case (software-type)
	    ((UNIX) "/usr/local/lib/slib/")
	    ((MACOS) (string-append (implementation-vicinity) "slib:"))
	    ((AMIGA) "dh0:scm/Library/")
	    ((VMS) "lib$scheme:")
	    ((WINDOWS MS-DOS) "C:\\SLIB\\")
	    (else "")))))
    (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 (getenv "HOME")))
    (if home
	(case (software-type)
	  ((UNIX COHERENT MS-DOS)	;V7 unix has a / on HOME
	   (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
	       home
	       (string-append home "/")))
	  (else home))
	(case (software-type)
	  ((VMS)      "~:")
	  ((WINDOWS)  "~/")
	  ((MACOS)    "~:")
	  (else #f)))))
;@
(define in-vicinity string-append)
;@
(define (user-vicinity)
  (case (software-type)
    ((VMS)	"[.]")
    (else	"")))

(define *load-pathname* #f)
;@
(define vicinity:suffix?
  (let ((suffi
	 (case (software-type)
	   ((AMIGA)				'(#\: #\/))
	   ((MACOS THINKC)			'(#\:))
	   ((MS-DOS WINDOWS ATARIST OS/2)	'(#\\ #\/))
	   ((NOSVE)				'(#\: #\.))
	   ((UNIX COHERENT PLAN9)		'(#\/))
	   ((VMS)				'(#\: #\]))
	   (else
	    (slib:warn "require.scm" 'unknown 'software-type (software-type))
	    "/"))))
    (lambda (chr) (and (memv chr suffi) #t))))
;@
(define (pathname->vicinity pathname)
  (let loop ((i (- (string-length pathname) 1)))
    (cond ((negative? i) "")
	  ((vicinity:suffix? (string-ref pathname i))
	   (substring pathname 0 (+ i 1)))
	  (else (loop (- i 1))))))
(define (program-vicinity)
  (if *load-pathname*
      (pathname->vicinity *load-pathname*)
      (slib:error 'program-vicinity " called; use slib:load to load")))
;@
(define sub-vicinity
  (case (software-type)
    ((VMS) (lambda
	       (vic name)
	     (let ((l (string-length vic)))
	       (if (or (zero? (string-length vic))
		       (not (char=? #\] (string-ref vic (- l 1)))))
		   (string-append vic "[" name "]")
		   (string-append (substring vic 0 (- l 1))
				  "." name "]")))))
    (else (let ((*vicinity-suffix*
		 (case (software-type)
		   ((NOSVE) ".")
		   ((MACOS THINKC) ":")
		   ((MS-DOS WINDOWS ATARIST OS/2) "\\")
		   ((UNIX COHERENT PLAN9 AMIGA) "/"))))
	    (lambda (vic name)
	      (string-append vic name *vicinity-suffix*))))))
;@
(define (make-vicinity <pathname>) <pathname>)
;@
(define with-load-pathname
  (let ((exchange
	 (lambda (new)
	   (let ((old *load-pathname*))
	     (set! *load-pathname* new)
	     old))))
    (lambda (path thunk)
      (let ((old #f))
	(dynamic-wind
	    (lambda () (set! old (exchange path)))
	    thunk
	    (lambda () (exchange old)))))))

;;@ *FEATURES* is a list of symbols naming the (SLIB) features
;;; initially supported by this implementation.
(define *features*
      '(
	source				;can load scheme source files
					;(SLIB:LOAD-SOURCE "filename")
	compiled			;can load compiled files
					;(SLIB:LOAD-COMPILED "filename")
	vicinity
	srfi-59

		       ;; Scheme report features
   ;; R5RS-compliant implementations should provide all 9 features.

;;;	r5rs				;conforms to
;;;	eval				;R5RS two-argument eval
	values				;R5RS multiple values
	dynamic-wind			;R5RS dynamic-wind
;;;	macro				;R5RS high level macros
	delay				;has DELAY and FORCE
	multiarg-apply			;APPLY can take more than 2 args.
	char-ready?
	rev4-optional-procedures	;LIST-TAIL, STRING-COPY,
					;STRING-FILL!, and VECTOR-FILL!

      ;; These four features are optional in both R4RS and R5RS

	multiarg/and-			;/ and - can take more than 2 args.
	rationalize
	transcript			;TRANSCRIPT-ON and TRANSCRIPT-OFF
	with-file			;has WITH-INPUT-FROM-FILE and
					;WITH-OUTPUT-TO-FILE

	r4rs				;conforms to

	ieee-p1178			;conforms to

;;;	r3rs				;conforms to

;;;	rev2-procedures			;SUBSTRING-MOVE-LEFT!,
					;SUBSTRING-MOVE-RIGHT!,
					;SUBSTRING-FILL!,
					;STRING-NULL?, APPEND!, 1+,
					;-1+, <?, <=?, =?, >?, >=?
;;;	object-hash			;has OBJECT-HASH

	full-continuation		;can return multiple times
	ieee-floating-point		;conforms to IEEE Standard 754-1985
					;IEEE Standard for Binary
					;Floating-Point Arithmetic.

			;; Other common features

	srfi				;srfi-0, COND-EXPAND finds all srfi-*
	sicp				;runs code from Structure and
					;Interpretation of Computer
					;Programs by Abelson and Sussman.
	defmacro			;has Common Lisp DEFMACRO
;;;	record				;has user defined data structures
	structure			;DEFINE-STRUCTURE macro
	string-port			;has CALL-WITH-INPUT-STRING and
					;CALL-WITH-OUTPUT-STRING
;;;	sort
	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)
	current-time			;returns time in seconds since 1/1/1970

		  ;; Implementation Specific features

	break

	))

(define object->limited-string object->string)

(define (difftime caltime1 caltime0)
  (- (time->seconds caltime1)
     (if (number? caltime0) caltime0 (time->seconds caltime0))))
(define (offset-time caltime offset)
  (seconds->time (+ (time->seconds caltime) offset)))

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

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

;;; (CURRENT-ERROR-PORT)
(define current-error-port
  (let ((port (current-output-port)))
    (lambda () port)))

;;; (TMPNAM) makes a temporary file name.
(define tmpnam (let ((cntr 100))
		 (lambda () (set! cntr (+ 1 cntr))
			 (string-append "slib_" (number->string cntr)))))

;;; Gambit supports SYSTEM as an "Unstable Addition"; Watch for changes.
(define system ##shell-command)

;;; CALL-WITH-INPUT-STRING is good as is.  Gambit's
;;; CALL-WITH-OUTPUT-STRING lengthens the string first argument.
(define call-with-output-string
  (let ((cwos call-with-output-string))
    (lambda (proc) (cwos "" proc))))

(define (make-exchanger obj)
  (lambda (rep) (let ((old obj)) (set! obj rep) old)))
(define open-file
  (let ((open-both open-file))
    (lambda (filename modes)
      (case modes
	((r rb) (open-input-file filename))
	((w wb) (open-output-file filename))
	((rw rwb) (open-both filename))
	(else (slib:error 'open-file 'mode? modes))))))
(define (call-with-open-ports . ports)
  (define proc (car ports))
  (cond ((procedure? proc) (set! ports (cdr ports)))
	(else (set! ports (reverse ports))
	      (set! proc (car ports))
	      (set! ports (reverse (cdr ports)))))
  (let ((ans (apply proc ports)))
    (for-each close-port ports)
    ans))

(define (browse-url url)
  (define (try cmd) (eqv? 0 (system (sprintf #f cmd url))))
  (or (try "netscape-remote -remote 'openURL(%s)'")
      (try "netscape -remote 'openURL(%s)'")
      (try "netscape '%s'&")
      (try "netscape '%s'")))

;;; "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)))

;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
;;; be returned by CHAR->INTEGER.
(define char-code-limit 256)

;; MOST-POSITIVE-FIXNUM is used in modular.scm
(define most-positive-fixnum #x1FFFFFFF) ; 3-bit tag for 68K

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

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

;;; If your implementation provides R4RS macros:
;(define macro:eval slib:eval)
;(define macro:load load)

(define *defmacros*
  (list (cons 'defmacro
	      (lambda (name parms . body)
		`(set! *defmacros* (cons (cons ',name (lambda ,parms ,@body))
					 *defmacros*))))))
(define (defmacro? m) (and (assq m *defmacros*) #t))

(define (macroexpand-1 e)
  (if (pair? e) (let ((a (car e)))
		  (cond ((symbol? a) (set! a (assq a *defmacros*))
				     (if a (apply (cdr a) (cdr e)) e))
			(else e)))
      e))

(define (macroexpand e)
  (if (pair? e) (let ((a (car e)))
		  (cond ((symbol? a)
			 (set! a (assq a *defmacros*))
			 (if a (macroexpand (apply (cdr a) (cdr e))) e))
			(else e)))
      e))

(define gentemp
  (let ((*gensym-counter* -1))
    (lambda ()
      (set! *gensym-counter* (+ *gensym-counter* 1))
      (string->symbol
       (string-append "slib:G" (number->string *gensym-counter*))))))

(define base:eval slib:eval)
(define defmacro:eval base:eval)

(define (defmacro:load <pathname>)
  (slib:eval-load <pathname> defmacro:eval))
;; slib:eval-load definition moved to "require.scm"

(define print-call-stack identity)	;noop

(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 #\  cep) (write 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 (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
(define t #t)
(define nil #f)

;;; Define these if your implementation's syntax can support it and if
;;; they are not already defined.
(define (1+ n) (+ n 1))
(define (-1+ n) (- n 1))
(define 1- -1+)

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

;;; 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 load)

;;; (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 load)

;;; At this point SLIB:LOAD must be able to load SLIB files.
(define slib:load slib:load-source)

(slib:eval '(define-macro (defmacro name parms . body)
	      (set! *defmacros* (cons `(cons ',name (lambda ,parms ,@body))
				      *defmacros*))
	      `(define-macro (,name ,@parms) ,@body)))

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