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;;;; Implementation of VICINITY and MODULES for 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.
(define *SLIB-VERSION* "2c7")
;;; Standardize msdos -> ms-dos.
(define software-type
(cond ((eq? 'msdos (software-type))
(lambda () 'ms-dos))
(else software-type)))
(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) '(#\/))
((VMS) '(#\: #\])))))
(lambda (chr) (memv chr suffi))))
(define (program-vicinity)
(if *load-pathname*
(let loop ((i (- (string-length *load-pathname*) 1)))
(cond ((negative? i) "")
((vicinity:suffix? (string-ref *load-pathname* i))
(substring *load-pathname* 0 (+ i 1)))
(else (loop (- i 1)))))
(slib:error "Not loading but called" 'program-vicinity)))
(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 AMIGA) "/"))))
(lambda (vic name)
(string-append vic name *vicinity-suffix*))))))
(define (make-vicinity <pathname>) <pathname>)
(define (slib:pathnameize-load *old-load*)
(lambda (<pathname> . extra)
(let ((old-load-pathname *load-pathname*))
(set! *load-pathname* <pathname>)
(apply *old-load* (cons <pathname> extra))
(require:provide <pathname>)
(set! *load-pathname* old-load-pathname))))
(set! slib:load-source
(slib:pathnameize-load slib:load-source))
(set! slib:load
(slib:pathnameize-load slib:load))
;;;; MODULES
(define *catalog* #f)
(define *modules* '())
(define (require:version path)
(let ((expr (and (file-exists? path)
(call-with-input-file path (lambda (port) (read port))))))
(and (list? expr) (= 3 (length expr))
(eq? (car expr) 'define) (eq? (cadr expr) '*SLIB-VERSION*)
(string? (caddr expr)) (caddr expr))))
(define (catalog/require-version-match? slibcat)
(let* ((apair (assq '*SLIB-VERSION* slibcat))
(req (in-vicinity (library-vicinity)
(string-append "require" (scheme-file-suffix))))
(reqvers (require:version req)))
(cond ((not (file-exists? req))
(slib:warn "can't find " req) #f)
((not apair) #f)
((not (equal? reqvers (cdr apair))) #f)
((not (equal? reqvers *SLIB-VERSION*))
(slib:warn "The loaded " req " is stale.")
#t)
(else #t))))
(define (catalog:try-read vicinity name)
(or (and vicinity name
(let ((path (in-vicinity vicinity name)))
(and (file-exists? path)
(call-with-input-file path
(lambda (port)
(do ((expr (read port) (read port))
(lst '() (cons expr lst)))
((eof-object? expr)
(apply append lst))))))))
'()))
(define (catalog:get feature)
(if (not *catalog*)
(let ((slibcat (catalog:try-read (implementation-vicinity) "slibcat")))
(cond ((not (catalog/require-version-match? slibcat))
(slib:load (in-vicinity (library-vicinity) "mklibcat"))
(set! slibcat
(catalog:try-read (implementation-vicinity) "slibcat"))))
(cond (slibcat
(set! *catalog* ((slib:eval
(cadr (or (assq 'catalog:filter slibcat)
'(#f identity))))
slibcat))))
(set! *catalog*
(append (catalog:try-read (home-vicinity) "homecat") *catalog*))
(set! *catalog*
(append (catalog:try-read (user-vicinity) "usercat") *catalog*))))
(and feature *catalog* (cdr (or (assq feature *catalog*) '(#f . #f)))))
(define (require:provided? feature)
(if (symbol? feature)
(if (memq feature *features*) #t
(let ((path (catalog:get feature)))
(cond ((symbol? path) (require:provided? path))
((member (if (pair? path) (cdr path) path) *modules*)
#t)
(else #f))))
(and (member feature *modules*) #t)))
(define (require:feature->path feature)
(and (symbol? feature)
(let ((path (catalog:get feature)))
(if (symbol? path) (require:feature->path path) path))))
(define (require:require feature)
(or (require:provided? feature)
(let ((path (catalog:get feature)))
(cond ((and (not path) (string? feature) (file-exists? feature))
(set! path feature)))
(cond ((not feature) (set! *catalog* #f))
((not path)
(slib:error ";required feature not supported: " feature))
((symbol? path) (require:require path) (require:provide feature))
((not (pair? path)) ;simple name
(slib:load path)
(and (not (eq? 'new-catalog feature)) (require:provide feature)))
(else ;special loads
(require:require (car path))
(apply (case (car path)
((macro) macro:load)
((syntactic-closures) synclo:load)
((syntax-case) syncase:load)
((macros-that-work) macwork:load)
((macro-by-example) defmacro:load)
((defmacro) defmacro:load)
((source) slib:load-source)
((compiled) slib:load-compiled)
(else (slib:error "unknown package loader" path)))
(if (list? path) (cdr path) (list (cdr path))))
(require:provide feature))))))
(define (require:provide feature)
(if (symbol? feature)
(if (not (memq feature *features*))
(set! *features* (cons feature *features*)))
(if (not (member feature *modules*))
(set! *modules* (cons feature *modules*)))))
(require:provide 'vicinity)
(define provide require:provide)
(define provided? require:provided?)
(define require require:require)
(if (and (string->number "0.0") (inexact? (string->number "0.0")))
(require:provide 'inexact))
(if (rational? (string->number "1/19")) (require:provide 'rational))
(if (real? (string->number "0.0")) (require:provide 'real))
(if (complex? (string->number "1+i")) (require:provide 'complex))
(let ((n (string->number "9999999999999999999999999999999")))
(if (and n (exact? n)) (require:provide 'bignum)))
(define report:print
(lambda args
(for-each (lambda (x) (write x) (display #\ )) args)
(newline)))
(define slib:report
(let ((slib:report (lambda () (slib:report-version) (slib:report-locations))))
(lambda args
(cond ((null? args) (slib:report))
((not (string? (car args)))
(slib:report-version) (slib:report-locations #t))
((require:provided? 'transcript)
(transcript-on (car args))
(slib:report)
(transcript-off))
((require:provided? 'with-file)
(with-output-to-file (car args) slib:report))
(else (slib:report))))))
(define slib:report-version
(lambda ()
(report:print
'SLIB *SLIB-VERSION* 'on (scheme-implementation-type)
(scheme-implementation-version) 'on (software-type))))
(define slib:report-locations
(let ((features *features*))
(lambda args
(report:print '(IMPLEMENTATION-VICINITY) 'is (implementation-vicinity))
(report:print '(LIBRARY-VICINITY) 'is (library-vicinity))
(report:print '(SCHEME-FILE-SUFFIX) 'is (scheme-file-suffix))
(cond (*load-pathname*
(report:print '*LOAD-PATHNAME* 'is *load-pathname*)))
(cond ((not (null? *modules*))
(report:print 'Loaded '*MODULES* 'are: *modules*)))
(let* ((i (+ -1 5)))
(cond ((eq? (car features) (car *features*)))
(else (report:print 'loaded '*FEATURES* ':) (display slib:tab)))
(for-each
(lambda (x)
(cond ((eq? (car features) x)
(if (not (eq? (car features) (car *features*))) (newline))
(report:print 'Implementation '*FEATURES* ':)
(display slib:tab) (set! i (+ -1 5)))
((zero? i) (newline) (display slib:tab) (set! i (+ -1 5)))
((not (= (+ -1 5) i)) (display #\ )))
(write x) (set! i (+ -1 i)))
*features*))
(newline)
(report:print 'Implementation '*CATALOG* ':)
(catalog:get #f)
(cond ((pair? args)
(for-each (lambda (x) (display slib:tab) (report:print x))
*catalog*))
(else (display slib:tab) (report:print (car *catalog*))
(display slib:tab) (report:print '...)))
(newline))))
(let ((sit (scheme-implementation-version)))
(cond ((zero? (string-length sit)))
((or (not (string? sit)) (char=? #\? (string-ref sit 0)))
(newline)
(slib:report-version)
(report:print 'edit (scheme-implementation-type) ".init"
'to 'set '(scheme-implementation-version) 'string)
(report:print '(IMPLEMENTATION-VICINITY) 'is (implementation-vicinity))
(report:print 'type '(slib:report) 'for 'configuration)
(newline))))
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