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+;;; "sisc.init" Initialization for SLIB for SISC-1.16.6 -*-scheme-*-
+;;; Author: matthias@sorted.org (Matthias Radestock)
+;;;
+;;; Based on:
+;;; "Template.scm" configuration template of *features* for Scheme
+;;; Author: Aubrey Jaffer
+;;;
+;;; This code is in the public domain.
+
+;;;TODO:
+;;; * implement |system|
+
+;;;;import vicinity support
+;;(require-extension (srfi 59))
+
+;;; srfi-59
+(define (program-vicinity)
+  (current-directory))
+
+(define (library-vicinity)
+  (string-append
+   (or (getenv "sisc.slib")
+       (getenv "sisc.lib")
+       (error "You must define the sisc.slib or sisc.lib property"))
+   "/"))
+
+(define (implementation-vicinity)
+  (string-append
+   (or (getenv "sisc.home")
+       (error "You must define the sisc.home property"))
+   "/"))
+
+(define (user-vicinity) "")
+
+(define (home-vicinity)
+  (string-append
+   (or (getenv "user.home")
+       (error "You must define the user.home property"))
+   "/"))
+
+(define in-vicinity normalize-url)
+
+(define (sub-vicinity vicinity name)
+  (string-append vicinity name "/"))
+
+(define (make-vicinity pathname) pathname)
+
+(define (pathname->vicinity pathname)
+  (let loop ((i (- (string-length pathname) 1)))
+    (cond ((negative? i) "")
+	  ((vicinity:suffix? (string-ref pathname i))
+	   (substring pathname 0 (+ i 1)))
+	  (else (loop (- i 1))))))
+
+(define (vicinity:suffix? chr)
+  (eqv? chr #\/))
+;;; end srfi-59
+
+;;@ (software-type) should be set to the generic operating system type.
+;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
+(define (software-type)
+  (define (string-starts-with-ci? s1 s2)
+    (let ([l (string-length s2)])
+      (and (not (< (string-length s1) l))
+           (string-ci=? (substring s1 0 l) s2))))
+  (let ([osn (getenv "os.name")])
+    (cond [(string-starts-with-ci? osn "win") 'ms-dos]
+          [(string-starts-with-ci? osn "mac") 'macos]
+          [(string-starts-with-ci? osn "os/2") 'os2]
+          [(string-starts-with-ci? osn "openvms") 'vms]
+          [(string-starts-with-ci? osn "vax") 'vax]
+          [else 'unix])))
+
+;;@ (scheme-implementation-type) should return the name of the scheme
+;;; implementation loading this file.
+(define (scheme-implementation-type) 'sisc)
+
+;;@ (scheme-implementation-home-page) should return a (string) URI
+;;; (Uniform Resource Identifier) for this scheme implementation's home
+;;; page; or false if there isn't one.
+(define (scheme-implementation-home-page)
+  "http://sisc.sourceforge.net/")
+
+;;@ (scheme-implementation-version) should return a string describing
+;;; the version the scheme implementation loading this file.
+(define (scheme-implementation-version)
+  (getprop 'version (get-symbolic-environment '*sisc*)))
+
+;@
+(define (with-load-pathname path thunk)
+  (parameterize
+   ([current-url path])
+   (thunk)))
+
+;;@ SLIB:FEATURES is a list of symbols naming the (SLIB) features
+;;; initially supported by this implementation.
+(define slib:features
+  '(
+    source				;can load scheme source files
+					;(SLIB:LOAD-SOURCE "filename")
+;;;	compiled			;can load compiled files
+					;(SLIB:LOAD-COMPILED "filename")
+    vicinity
+    srfi-59
+
+	       ;;; Scheme report features
+    ;; R5RS-compliant implementations should provide all 9 features.
+    r5rs				;conforms to
+    eval				;R5RS two-argument eval
+    values				;R5RS multiple values
+    dynamic-wind			;R5RS dynamic-wind
+    macro				;R5RS high level macros
+    delay				;has DELAY and FORCE
+    multiarg-apply		     ;APPLY can take more than 2 args.
+    char-ready?
+    rev4-optional-procedures		;LIST-TAIL, STRING-COPY,
+					;STRING-FILL!, and VECTOR-FILL!
+
+    ;; These four features are optional in both R4RS and R5RS
+    multiarg/and-		   ;/ and - can take more than 2 args.
+    rationalize
+    transcript			     ;TRANSCRIPT-ON and TRANSCRIPT-OFF
+    with-file				;has WITH-INPUT-FROM-FILE and
+					;WITH-OUTPUT-TO-FILE
+
+    r4rs				;conforms to
+    ieee-p1178				;conforms to
+    r3rs				;conforms to
+;;;	rev2-procedures			;SUBSTRING-MOVE-LEFT!,
+					;SUBSTRING-MOVE-RIGHT!,
+					;SUBSTRING-FILL!,
+					;STRING-NULL?, APPEND!, 1+,
+					;-1+, <?, <=?, =?, >?, >=?
+
+    object-hash				;has OBJECT-HASH
+
+    full-continuation			;can return multiple times
+    ieee-floating-point		   ;conforms to IEEE Standard 754-1985
+					;IEEE Standard for Binary
+					;Floating-Point Arithmetic.
+
+		;;; Other common features
+
+    srfi			 ;srfi-0, COND-EXPAND finds all srfi-*
+;;;	sicp				;runs code from Structure and
+					;Interpretation of Computer
+					;Programs by Abelson and Sussman.
+    defmacro				;has Common Lisp DEFMACRO
+    record			     ;has user defined data structures
+    string-port			       ;has CALL-WITH-INPUT-STRING and
+					;CALL-WITH-OUTPUT-STRING
+;;;	sort
+    pretty-print
+;;;	object->string
+;;;	format				;Common-lisp output formatting
+;;;	trace				;has macros: TRACE and UNTRACE
+;;;	compiler			;has (COMPILER)
+;;;	ed				;(ED) is editor
+;;;	system				;posix (system <string>)
+;;;	getenv				;posix (getenv <string>)
+;;;	program-arguments		;returns list of strings (argv)
+    current-time	       ;returns time in seconds since 1/1/1970
+
+	  ;;; Implementation Specific features
+    ))
+
+;;; import SISC record support, to stop SLIB using its own
+(import record)
+
+(import string-io)
+
+;;@
+(define (current-time) (quotient (system-time) 1000))
+;;@
+(define object-hash hash-code)
+
+;;@ (FILE-POSITION <port> . <k>)
+(define (file-position . args) #f)
+
+;;@ (OUTPUT-PORT-WIDTH <port>)
+(define (output-port-width . arg)
+  (let ((env-width-string (getenv "COLUMNS")))
+    (if (and env-width-string
+             (let loop ((remaining (string-length env-width-string)))
+               (or (zero? remaining)
+                   (let ((next (- remaining 1)))
+                     (and (char-numeric? (string-ref env-width-string
+                                                     next))
+                          (loop next))))))
+        (- (string->number env-width-string) 1)
+        79)))
+
+;;@ (OUTPUT-PORT-HEIGHT <port>)
+(define (output-port-height . arg)
+  (let ((env-height-string (getenv "LINES")))
+    (if (and env-height-string
+             (let loop ((remaining (string-length env-height-string)))
+               (or (zero? remaining)
+                   (let ((next (- remaining 1)))
+                     (and (char-numeric? (string-ref env-height-string
+                                                     next))
+                          (loop next))))))
+        (string->number env-height-string)
+        24)))
+
+;;@ (CURRENT-ERROR-PORT)
+(define current-error-port
+  (let ((port (current-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)))))
+
+;;@ (FILE-EXISTS? <string>)
+;;(define (file-exists? f) #f)
+
+;;@ (DELETE-FILE <string>)
+(define (delete-file f) #f)
+
+;;@ 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.
+
+;;@ "rationalize" adjunct procedures.
+;;(define (find-ratio x e)
+;;  (let ((rat (rationalize x e)))
+;;    (list (numerator rat) (denominator rat))))
+;;(define (find-ratio-between x y)
+;;  (find-ratio (/ (+ x y) 2) (/ (- x y) 2)))
+
+;;@ CHAR-CODE-LIMIT is one greater than the largest integer which can
+;;; be returned by CHAR->INTEGER.
+(define char-code-limit 65536)
+
+;;@ MOST-POSITIVE-FIXNUM is used in modular.scm
+(define most-positive-fixnum (- (ashl 1 31) 1))
+
+;;@ Return argument
+(define (identity x) x)
+
+;;@ SLIB:EVAL is single argument eval using the top-level (user) environment.
+(define slib:eval eval)
+
+;@
+(define slib:warn
+  (lambda args
+    (let ((cep (current-error-port)))
+      (if (provided? 'trace) (print-call-stack cep))
+      (display "Warn: " cep)
+      (for-each (lambda (x) (display #\  cep) (write x cep)) args))))
+
+;;@ define an error procedure for the library
+(define (slib:error . args)
+  (if (provided? 'trace) (print-call-stack (current-error-port)))
+  (let loop ([l args]
+             [f ""])
+    (if (null? l)
+        (apply error f args)
+        (loop (cdr l) (string-append f " ~a")))))
+;@
+(define (make-exchanger obj)
+  (lambda (rep) (let ((old obj)) (set! obj rep) old)))
+(define (open-file filename modes)
+  (case modes
+    ((r rb) (open-input-file filename))
+    ((w wb) (open-output-file filename))
+    (else (slib:error 'open-file 'mode? modes))))
+;;;(define (port? obj) (or (input-port? port) (output-port? port)))
+(define (call-with-open-ports . ports)
+  (define proc (car ports))
+  (cond ((procedure? proc) (set! ports (cdr ports)))
+    (else (set! ports (reverse ports))
+          (set! proc (car ports))
+          (set! ports (reverse (cdr ports)))))
+  (let ((ans (apply proc ports)))
+    (for-each close-port ports)
+    ans))
+(define (close-port port)
+  (cond ((input-port? port)
+     (close-input-port port)
+     (if (output-port? port) (close-output-port port)))
+    ((output-port? port) (close-output-port port))
+    (else (slib:error 'close-port 'port? port))))
+;@
+(define (browse-url url)
+  (define (try cmd end) (zero? (system (string-append cmd url end))))
+  (or (try "netscape-remote -remote 'openURL(" ")'")
+      (try "netscape -remote 'openURL(" ")'")
+      (try "netscape '" "'&")
+      (try "netscape '" "'")))
+
+;;@ define these as appropriate for your system.
+(define slib:tab #\tab)
+(define slib:form-feed #\page)
+
+;;@ Support for older versions of Scheme.  Not enough code for its own file.
+(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
+(define t #t)
+(define nil #f)
+
+;;@ 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 SLIB:EXIT to be the implementation procedure to exit or
+;;; return if exiting not supported.
+(define slib:exit exit)
+
+;;@ 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.
+(define (slib:load-source f) (load (string-append f (scheme-file-suffix))))
+
+;;@ (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)
+
+;; If your implementation provides R4RS macros:
+(define macro:eval slib:eval)
+(define macro:load load)
+
+;@
+(define gentemp gensym)
+
+;@
+(define defmacro:load slib:load-source)
+
+(slib:load (in-vicinity (library-vicinity) "require"))