summaryrefslogtreecommitdiffstats
path: root/elk.init
blob: a127cf90afae176b4e8ddada78bc4c10a46d624e (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
;;;"elk.init" Initialisation file for SLIB for ELK 2.1	-*- Scheme -*-
;;; Copyright (C) 1991, 1992, 1993, 1994, 1997 Aubrey Jaffer.
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1.  Any copy made of this software must include this copyright notice
;in full.
;
;2.  I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3.  In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.

; No guarantees are given about the correctness of any of the
; choices made below.  Only enough work was done to get the require
; mechanism to work correctly.
;
; Stephen J. Bevan <bevan@cs.man.ac.uk> 19920912 modified by Mike
; Sperber to work correctly with statically-linked Elk and slib1d.  Be
; sure to change the library vicinities according to your local
; configuration.  If you're running MS-DOS (which is possible since
; 2.1), you probably have to change this file to make everything work
; correctly.

;;; (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) 'Elk)

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

(define (scheme-implementation-version) "3.0")

;;; (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)	 "/usr/local/lib/elk-2.1/scm/")
    ((VMS)	"scheme$src:")
    ((MS-DOS)	"C:\\scheme\\")))

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

(require 'unix)
(define getenv unix-getenv)
(define system unix-system)

(define library-vicinity
  (let ((library-path
	 (or (getenv "SCHEME_LIBRARY_PATH")
	     ;; Uses this path if SCHEME_LIBRARY_PATH is not defined.
	     (case (software-type)
	       ((UNIX) "/usr/local/lib/slib/")
	       ((VMS) "lib$scheme:")
	       ((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-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
	ieee-p1178
	sicp
	rev4-optional-procedures
	rev3-procedures
	rev2-procedures
	multiarg/and-
	multiarg-apply
	delay
	transcript
	full-continuation
	sort
	format
	system
	getenv
	program-arguments
	string-port
	))

;------------

(define program-arguments
  (lambda ()
    (cons "undefined-program-name" (command-line-args))))

; EXACT? appears to always return #f which isn't very useful.
; Approximating it with INTEGER? at least means that some
; of the code in the library will work correctly

(define exact? integer?)  ; WARNING: redefining EXACT?

(define (inexact? arg)
  (not (exact? arg)))

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

; Pull in GENTENV and SYSTEM

;;; (FILE-EXISTS? <string>) already here.

;;; (DELETE-FILE <string>)
(define (delete-file f) (system (string-append "rm " f)))

;------------

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

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

;;; (CURRENT-ERROR-PORT)
;;; is already defined in Elk 2.1

;;; FORCE-OUTPUT flushes any pending output on optional arg output port
;;; use this definition if your system doesn't have such a procedure.
(define force-output flush-output-port)

;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
;;; port versions of CALL-WITH-*PUT-FILE.
(define (call-with-output-string f)
  (let ((outsp (open-output-string)))
    (f outsp)
    (let ((s (get-output-string outsp)))
      (close-output-port outsp)
      s)))

(define (call-with-input-string s f)
  (let* ((insp (open-input-string s))
	 (res (f insp)))
    (close-input-port insp)
    res))

;;; 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 8388608)  ; 23 bit integers ?

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

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

(define *macros* '())
(define (defmacro? m) (and (assq m *macros*) #t))

(define-macro (defmacro key pattern . body)
  `(begin
     (define-macro ,(cons key pattern) ,@body)
     (set! *macros* (cons (cons ',key (lambda ,pattern ,@body)) *macros*))))

(define (macroexpand-1 e)
  (if (pair? e) (let ((a (car e)))
		  (cond ((symbol? a) (set! a (assq a *macros*))
				     (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 *macros*))
			 (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 defmacro:eval slib:eval)
(define defmacro:load load)
;;; If your implementation provides R4RS macros:
;(define macro:eval slib:eval)
;(define macro:load load)

(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 slib:warn
  (lambda args
    (let ((port (current-error-port)))
      (display "Warn: " port)
      (for-each (lambda (x) (display x port)) args))))

;;; define an error procedure for the library
(define slib:error
  (lambda args
    (let ((port (open-output-string))
	  (err (if (and (pair? args) (symbol? (car args)))
		   (car args) 'slib))
	  (args (if (and (pair? args) (symbol? (car args)))
		    (cdr args) args)))
      (for-each (lambda (x) (display x port) (display " " port)) args)
      (let ((str (get-output-string port)))
	(close-output-port port)
	(error err str)))))

;;; define these as appropriate for your system.
(define slib:tab #\tab)
(define slib:form-feed #\formfeed)

;;; 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 in-vicinity string-append)

;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exitting not supported.
(define slib:exit
  (lambda args
    (exit (cond ((null? args) 0)
		((eqv? #t (car args)) 0)
		((and (number? (car args)) (integer? (car args))) (car args))
		(else 1)))))

;;; 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.

; Modify the already modified _load_ so that it copes with
; environments correctly.  The change involves using
; _(global-environment)_ if none is explicitly specified.
; If this is not done, definitions in files loaded by other files will
; not be loaded in the correct environment.

(define slib:load-source
  (let ((primitive-load load))
    (lambda (<pathname> . rest)
      (let ((env (if (null? rest) (list (global-environment)) rest)))
	(apply primitive-load <pathname> env)))))

;;; (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
  (let ((primitive-load load))
    (lambda (<pathname> . rest)
      (apply primitive-load (string->symbol (string-append name ".o")) rest))))

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

(define slib:load slib:load-source)	;WARNING: redefining LOAD

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