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+;;;"mitscheme.init" Initialization for SLIB for MITScheme        -*-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.
+
+;;; Make this part of your ~/.scheme.init file.
+
+;;; (software-type) should be set to the generic operating system type.
+(define (software-type) 'UNIX)
+
+;;; (scheme-implementation-type) should return the name of the scheme
+;;; implementation loading this file.
+
+(define (scheme-implementation-type) 'MITScheme)
+
+;;; (scheme-implementation-version) should return a string describing
+;;; the version the scheme implementation loading this file.
+
+(define (scheme-implementation-version) "7.3.0")
+
+;;; *features* should be set to a list of symbols describing features
+;;; of this implementation.  See Template.scm for the list of feature
+;;; names.
+
+;the following may not be the Right Thing for this application, since
+;it causes an error (rather than just returning nil) when the environment
+;variable is not defined.
+(define getenv get-environment-variable)
+
+;;; (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/src/scheme/")
+    ((VMS)	"scheme$src:")))
+
+;;; (library-vicinity) should be defined to be the pathname of the
+;;; directory where files of Scheme library functions reside.
+
+(define library-vicinity
+  (let ((library-path
+	 (or (getenv "SCHEME_LIBRARY_PATH")
+	     ;; Use this path if your scheme does not support GETENV.
+	     (case (software-type)
+	       ((UNIX) "/usr/local/lib/slib/")
+	       ((VMS) "lib$scheme:")
+	       ((MS-DOS) "C:\\SLIB\\")
+	       (else "")))))
+    (lambda () library-path)))
+
+(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
+	rationalize
+	object-hash
+	delay
+	with-file
+	string-port
+	transcript
+	char-ready?
+	record
+	values
+	dynamic-wind
+	ieee-floating-point
+	full-continuation
+;	sort
+	queue
+	pretty-print
+	object->string
+	trace				;has macros: TRACE and UNTRACE
+	compiler
+	getenv
+	Xwindows
+	))
+
+;;; (OUTPUT-PORT-WIDTH <port>)
+(define output-port-width output-port/x-size)
+
+;;; (OUTPUT-PORT-HEIGHT <port>)
+(define (output-port-height . arg) 24)
+
+;;; (CURRENT-ERROR-PORT)
+(define current-error-port
+  (let ((port console-output-port))
+    (lambda () port)))
+
+;;; (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)))))
+
+;;; FORCE-OUTPUT flushes any pending output on optional arg output port.
+(define force-output flush-output)
+;;; MITScheme 7.2 is missing flush-output.  Use this instead
+;(define (force-output . arg) #t)
+
+;;; CALL-WITH-INPUT-STRING and CALL-WITH-OUTPUT-STRING are the string
+;;; port versions of CALL-WITH-*PUT-FILE.
+(define (call-with-output-string proc)
+  (let ((co (current-output-port)))
+    (with-output-to-string
+      (lambda ()
+	(let ((port (current-output-port)))
+	  (with-output-to-port co
+	    (lambda () (proc port))))))))
+
+(define (call-with-input-string string proc)
+  (let ((ci (current-input-port)))
+    (with-input-from-string string
+      (lambda ()
+	(let ((port (current-input-port)))
+	  (with-input-from-port ci
+	    (lambda () (proc port))))))))
+
+(define object->string write-to-string)
+
+;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
+;;; be returned by CHAR->INTEGER.  It is defined by MITScheme.
+
+;;; MOST-POSITIVE-FIXNUM is used in modular.scm
+(define most-positive-fixnum #x03FFFFFF)
+
+;;; 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 form) (eval form (repl/environment (nearest-repl))))
+(define (slib:eval form) (eval form user-initial-environment))
+
+(define *macros* '(defmacro))
+(define (defmacro? m) (and (memq m *macros*) #t))
+
+(syntax-table-define system-global-syntax-table 'defmacro
+  (macro defmacargs
+    (let ((macname (car defmacargs)) (macargs (cadr defmacargs))
+				     (macbdy (cddr defmacargs)))
+      `(begin
+	 (set! *macros* (cons ',macname *macros*))
+	 (syntax-table-define system-global-syntax-table ',macname
+	   (macro ,macargs ,@macbdy))))))
+
+(define (macroexpand-1 e)
+  (if (pair? e) (let ((a (car e)))
+		  (if (and (symbol? a) (defmacro? a))
+		      (apply (syntax-table-ref system-global-syntax-table a)
+			     (cdr e))
+		      e))
+      e))
+
+(define (macroexpand e)
+  (if (pair? e) (let ((a (car e)))
+		  (if (and (symbol? a) (defmacro? a))
+		      (macroexpand
+		       (apply (syntax-table-ref system-global-syntax-table a)
+			      (cdr e)))
+		      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 record-modifier record-updater)	;some versions need this?
+
+;; define an error procedure for the library
+(define (slib:error . args)
+  (apply error-procedure (append args (list (the-environment)))))
+
+;; define these as appropriate for your system.
+(define slib:tab (integer->char 9))
+(define slib:form-feed (integer->char 12))
+
+(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
+    (cond ((null? args) (exit))
+	  ((eqv? #t (car args)) (exit))
+	  ((and (number? (car args)) (integer? (car args))) (exit (car args)))
+	  (else (exit 1)))))
+
+;;; Here for backward compatability
+
+(define (scheme-file-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:load (in-vicinity (library-vicinity) "require"))