;;;"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) "@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) "@prefix@/share/elk")
;;; (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)))
(define (library-vicinity) "@prefix@/lib/slib/")
;;; *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 <------- does elk 3.0 really have getenv? couldn't find it
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 (string-append <pathname> ".scm") 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"))