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- ;;;"elk.init" Initialisation file for SLIB for ELK 2.1 -*- Scheme -*-
- ;;; Copyright (C) 1991, 1992, 1993 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) "?2.1")
-
- ;;; (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$src:")
- ((MS-DOS) "C:\\scheme\\")))
-
- ;;; (library-vicinity) should be defined to be the pathname of the
- ;;; directory where files of Scheme library functions reside.
-
- (define library-vicinity
- (let ((library-path
- (or (getenv "SCHEME_LIBRARY_PATH")
- ;; Uses this path if SCHEME_LIBRARY_PATH is not defined.
- (case (software-type)
- ((UNIX) "/usr/local/lib/slib/")
- ((VMS) "lib$scheme:")
- ((MS-DOS) "C:\\SLIB\\")
- (else "")))))
- (lambda () library-path)))
-
- ;;; *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)))))
-
- (require 'unix)
-
- ; 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)
-
- ;;; If your implementation provides eval 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 an error procedure for the library
- (define slib:error error)
-
- ;;; 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"))
-