From e42129241681dde7adae7d20697e7b421682fbb4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 18:23:22 +0200
Subject: Adding upstream version 2.10.22.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 plug-ins/script-fu/scripts/script-fu.init | 716 ++++++++++++++++++++++++++++++
 1 file changed, 716 insertions(+)
 create mode 100644 plug-ins/script-fu/scripts/script-fu.init

(limited to 'plug-ins/script-fu/scripts/script-fu.init')

diff --git a/plug-ins/script-fu/scripts/script-fu.init b/plug-ins/script-fu/scripts/script-fu.init
new file mode 100644
index 0000000..d0c9e30
--- /dev/null
+++ b/plug-ins/script-fu/scripts/script-fu.init
@@ -0,0 +1,716 @@
+;    Initialization file for TinySCHEME 1.40
+
+; Per R5RS, up to four deep compositions should be defined
+(define (caar x) (car (car x)))
+(define (cadr x) (car (cdr x)))
+(define (cdar x) (cdr (car x)))
+(define (cddr x) (cdr (cdr x)))
+(define (caaar x) (car (car (car x))))
+(define (caadr x) (car (car (cdr x))))
+(define (cadar x) (car (cdr (car x))))
+(define (caddr x) (car (cdr (cdr x))))
+(define (cdaar x) (cdr (car (car x))))
+(define (cdadr x) (cdr (car (cdr x))))
+(define (cddar x) (cdr (cdr (car x))))
+(define (cdddr x) (cdr (cdr (cdr x))))
+(define (caaaar x) (car (car (car (car x)))))
+(define (caaadr x) (car (car (car (cdr x)))))
+(define (caadar x) (car (car (cdr (car x)))))
+(define (caaddr x) (car (car (cdr (cdr x)))))
+(define (cadaar x) (car (cdr (car (car x)))))
+(define (cadadr x) (car (cdr (car (cdr x)))))
+(define (caddar x) (car (cdr (cdr (car x)))))
+(define (cadddr x) (car (cdr (cdr (cdr x)))))
+(define (cdaaar x) (cdr (car (car (car x)))))
+(define (cdaadr x) (cdr (car (car (cdr x)))))
+(define (cdadar x) (cdr (car (cdr (car x)))))
+(define (cdaddr x) (cdr (car (cdr (cdr x)))))
+(define (cddaar x) (cdr (cdr (car (car x)))))
+(define (cddadr x) (cdr (cdr (car (cdr x)))))
+(define (cdddar x) (cdr (cdr (cdr (car x)))))
+(define (cddddr x) (cdr (cdr (cdr (cdr x)))))
+
+;;;; Utility to ease macro creation
+(define (macro-expand form)
+     ((eval (get-closure-code (eval (car form)))) form))
+
+(define (macro-expand-all form)
+   (if (macro? form)
+      (macro-expand-all (macro-expand form))
+      form))
+
+(define *compile-hook* macro-expand-all)
+
+
+(macro (unless form)
+     `(if (not ,(cadr form)) (begin ,@(cddr form))))
+
+(macro (when form)
+     `(if ,(cadr form) (begin ,@(cddr form))))
+
+; DEFINE-MACRO Contributed by Andy Gaynor
+(macro (define-macro dform)
+  (if (symbol? (cadr dform))
+    `(macro ,@(cdr dform))
+    (let ((form (gensym)))
+      `(macro (,(caadr dform) ,form)
+         (apply (lambda ,(cdadr dform) ,@(cddr dform)) (cdr ,form))))))
+
+; Utilities for math. Notice that inexact->exact is primitive,
+; but exact->inexact is not.
+(define exact? integer?)
+(define (inexact? x) (and (real? x) (not (integer? x))))
+(define (even? n) (= (remainder n 2) 0))
+(define (odd? n) (not (= (remainder n 2) 0)))
+(define (zero? n) (= n 0))
+(define (positive? n) (> n 0))
+(define (negative? n) (< n 0))
+(define complex? number?)
+(define rational? real?)
+(define (abs n) (if (>= n 0) n (- n)))
+(define (exact->inexact n) (* n 1.0))
+(define (<> n1 n2) (not (= n1 n2)))
+
+; min and max must return inexact if any arg is inexact; use (+ n 0.0)
+(define (max . lst)
+  (foldr (lambda (a b)
+           (if (> a b)
+             (if (exact? b) a (+ a 0.0))
+             (if (exact? a) b (+ b 0.0))))
+         (car lst) (cdr lst)))
+(define (min . lst)
+  (foldr (lambda (a b)
+           (if (< a b)
+             (if (exact? b) a (+ a 0.0))
+             (if (exact? a) b (+ b 0.0))))
+         (car lst) (cdr lst)))
+
+(define (succ x) (+ x 1))
+(define (pred x) (- x 1))
+(define gcd
+  (lambda a
+    (if (null? a)
+      0
+      (let ((aa (abs (car a)))
+            (bb (abs (cadr a))))
+         (if (= bb 0)
+              aa
+              (gcd bb (remainder aa bb)))))))
+(define lcm
+  (lambda a
+    (if (null? a)
+      1
+      (let ((aa (abs (car a)))
+            (bb (abs (cadr a))))
+         (if (or (= aa 0) (= bb 0))
+             0
+             (abs (* (quotient aa (gcd aa bb)) bb)))))))
+
+
+(define (string . charlist)
+     (list->string charlist))
+
+(define (list->string charlist)
+     (let* ((len (length charlist))
+            (newstr (make-string len))
+            (fill-string!
+               (lambda (str i len charlist)
+                    (if (= i len)
+                         str
+                         (begin (string-set! str i (car charlist))
+                         (fill-string! str (+ i 1) len (cdr charlist)))))))
+          (fill-string! newstr 0 len charlist)))
+
+(define (string-fill! s e)
+     (let ((n (string-length s)))
+          (let loop ((i 0))
+               (if (= i n)
+                    s
+                    (begin (string-set! s i e) (loop (succ i)))))))
+
+(define (string->list s)
+     (let loop ((n (pred (string-length s))) (l '()))
+          (if (= n -1)
+               l
+               (loop (pred n) (cons (string-ref s n) l)))))
+
+(define (string-copy str)
+     (string-append str))
+
+(define (string->anyatom str pred)
+     (let* ((a (string->atom str)))
+       (if (pred a) a
+         (error "string->xxx: not a xxx" a))))
+
+(define (string->number str . base)
+    (let ((n (string->atom str (if (null? base) 10 (car base)))))
+        (if (number? n) n #f)))
+
+(define (anyatom->string n pred)
+  (if (pred n)
+      (atom->string n)
+      (error "xxx->string: not a xxx" n)))
+
+
+(define (number->string n . base)
+    (atom->string n (if (null? base) 10 (car base))))
+
+(define (char-cmp? cmp a b)
+     (cmp (char->integer a) (char->integer b)))
+(define (char-ci-cmp? cmp a b)
+     (cmp (char->integer (char-downcase a)) (char->integer (char-downcase b))))
+
+(define (char=? a b) (char-cmp? = a b))
+(define (char<? a b) (char-cmp? < a b))
+(define (char>? a b) (char-cmp? > a b))
+(define (char<=? a b) (char-cmp? <= a b))
+(define (char>=? a b) (char-cmp? >= a b))
+
+(define (char-ci=? a b) (char-ci-cmp? = a b))
+(define (char-ci<? a b) (char-ci-cmp? < a b))
+(define (char-ci>? a b) (char-ci-cmp? > a b))
+(define (char-ci<=? a b) (char-ci-cmp? <= a b))
+(define (char-ci>=? a b) (char-ci-cmp? >= a b))
+
+; Note the trick of returning (cmp x y)
+(define (string-cmp? chcmp cmp a b)
+     (let ((na (string-length a)) (nb (string-length b)))
+          (let loop ((i 0))
+               (cond
+                    ((= i na)
+                         (if (= i nb) (cmp 0 0) (cmp 0 1)))
+                    ((= i nb)
+                         (cmp 1 0))
+                    ((chcmp = (string-ref a i) (string-ref b i))
+                         (loop (succ i)))
+                    (else
+                         (chcmp cmp (string-ref a i) (string-ref b i)))))))
+
+
+(define (string=? a b) (string-cmp? char-cmp? = a b))
+(define (string<? a b) (string-cmp? char-cmp? < a b))
+(define (string>? a b) (string-cmp? char-cmp? > a b))
+(define (string<=? a b) (string-cmp? char-cmp? <= a b))
+(define (string>=? a b) (string-cmp? char-cmp? >= a b))
+
+(define (string-ci=? a b) (string-cmp? char-ci-cmp? = a b))
+(define (string-ci<? a b) (string-cmp? char-ci-cmp? < a b))
+(define (string-ci>? a b) (string-cmp? char-ci-cmp? > a b))
+(define (string-ci<=? a b) (string-cmp? char-ci-cmp? <= a b))
+(define (string-ci>=? a b) (string-cmp? char-ci-cmp? >= a b))
+
+(define (list . x) x)
+
+(define (foldr f x lst)
+     (if (null? lst)
+          x
+          (foldr f (f x (car lst)) (cdr lst))))
+
+(define (unzip1-with-cdr . lists)
+  (unzip1-with-cdr-iterative lists '() '()))
+
+(define (unzip1-with-cdr-iterative lists cars cdrs)
+  (if (null? lists)
+      (cons cars cdrs)
+      (let ((car1 (caar lists))
+            (cdr1 (cdar lists)))
+        (unzip1-with-cdr-iterative
+          (cdr lists)
+          (append cars (list car1))
+          (append cdrs (list cdr1))))))
+
+(define (map proc . lists)
+  (if (null? lists)
+      (apply proc)
+      (if (null? (car lists))
+        '()
+        (let* ((unz (apply unzip1-with-cdr lists))
+               (cars (car unz))
+               (cdrs (cdr unz)))
+          (cons (apply proc cars) (apply map (cons proc cdrs)))))))
+
+(define (for-each proc . lists)
+  (if (null? lists)
+      (apply proc)
+      (if (null? (car lists))
+        #t
+        (let* ((unz (apply unzip1-with-cdr lists))
+               (cars (car unz))
+               (cdrs (cdr unz)))
+          (apply proc cars) (apply map (cons proc cdrs))))))
+
+(define (list-tail x k)
+    (if (zero? k)
+        x
+        (list-tail (cdr x) (- k 1))))
+
+(define (list-ref x k)
+    (car (list-tail x k)))
+
+(define (last-pair x)
+    (if (pair? (cdr x))
+        (last-pair (cdr x))
+        x))
+
+(define (head stream) (car stream))
+
+(define (tail stream) (force (cdr stream)))
+
+(define (vector-equal? x y)
+     (and (vector? x) (vector? y) (= (vector-length x) (vector-length y))
+          (let ((n (vector-length x)))
+               (let loop ((i 0))
+                    (if (= i n)
+                         #t
+                         (and (equal? (vector-ref x i) (vector-ref y i))
+                              (loop (succ i))))))))
+
+(define (list->vector x)
+     (apply vector x))
+
+(define (vector-fill! v e)
+     (let ((n (vector-length v)))
+          (let loop ((i 0))
+               (if (= i n)
+                    v
+                    (begin (vector-set! v i e) (loop (succ i)))))))
+
+(define (vector->list v)
+     (let loop ((n (pred (vector-length v))) (l '()))
+          (if (= n -1)
+               l
+               (loop (pred n) (cons (vector-ref v n) l)))))
+
+;; The following quasiquote macro is due to Eric S. Tiedemann.
+;;   Copyright 1988 by Eric S. Tiedemann; all rights reserved.
+;;
+;; Subsequently modified to handle vectors: D. Souflis
+
+(macro
+ quasiquote
+ (lambda (l)
+   (define (mcons f l r)
+     (if (and (pair? r)
+              (eq? (car r) 'quote)
+              (eq? (car (cdr r)) (cdr f))
+              (pair? l)
+              (eq? (car l) 'quote)
+              (eq? (car (cdr l)) (car f)))
+         (if (or (procedure? f) (number? f) (string? f))
+               f
+               (list 'quote f))
+         (if (eqv? l vector)
+               (apply l (eval r))
+               (list 'cons l r)
+               )))
+   (define (mappend f l r)
+     (if (or (null? (cdr f))
+             (and (pair? r)
+                  (eq? (car r) 'quote)
+                  (eq? (car (cdr r)) '())))
+         l
+         (list 'append l r)))
+   (define (foo level form)
+     (cond ((not (pair? form))
+               (if (or (procedure? form) (number? form) (string? form))
+                    form
+                    (list 'quote form))
+               )
+           ((eq? 'quasiquote (car form))
+            (mcons form ''quasiquote (foo (+ level 1) (cdr form))))
+           (#t (if (zero? level)
+                   (cond ((eq? (car form) 'unquote) (car (cdr form)))
+                         ((eq? (car form) 'unquote-splicing)
+                          (error "Unquote-splicing wasn't in a list:"
+                                 form))
+                         ((and (pair? (car form))
+                               (eq? (car (car form)) 'unquote-splicing))
+                          (mappend form (car (cdr (car form)))
+                                   (foo level (cdr form))))
+                         (#t (mcons form (foo level (car form))
+                                         (foo level (cdr form)))))
+                   (cond ((eq? (car form) 'unquote)
+                          (mcons form ''unquote (foo (- level 1)
+                                                     (cdr form))))
+                         ((eq? (car form) 'unquote-splicing)
+                          (mcons form ''unquote-splicing
+                                      (foo (- level 1) (cdr form))))
+                         (#t (mcons form (foo level (car form))
+                                         (foo level (cdr form)))))))))
+   (foo 0 (car (cdr l)))))
+
+;;;;;Helper for the dynamic-wind definition.  By Tom Breton (Tehom)
+(define (shared-tail x y)
+   (let ((len-x (length x))
+         (len-y (length y)))
+      (define (shared-tail-helper x y)
+         (if
+            (eq? x y)
+            x
+            (shared-tail-helper (cdr x) (cdr y))))
+
+      (cond
+         ((> len-x len-y)
+            (shared-tail-helper
+               (list-tail x (- len-x len-y))
+               y))
+         ((< len-x len-y)
+            (shared-tail-helper
+               x
+               (list-tail y (- len-y len-x))))
+         (#t (shared-tail-helper x y)))))
+
+;;;;;Dynamic-wind by Tom Breton (Tehom)
+
+;;Guarded because we must only eval this once, because doing so
+;;redefines call/cc in terms of old call/cc
+(unless (defined? 'dynamic-wind)
+   (let
+      ;;These functions are defined in the context of a private list of
+      ;;pairs of before/after procs.
+      (  (*active-windings* '())
+         ;;We'll define some functions into the larger environment, so
+         ;;we need to know it.
+         (outer-env (current-environment)))
+
+      ;;Poor-man's structure operations
+      (define before-func car)
+      (define after-func  cdr)
+      (define make-winding cons)
+
+      ;;Manage active windings
+      (define (activate-winding! new)
+         ((before-func new))
+         (set! *active-windings* (cons new *active-windings*)))
+      (define (deactivate-top-winding!)
+         (let ((old-top (car *active-windings*)))
+            ;;Remove it from the list first so it's not active during its
+            ;;own exit.
+            (set! *active-windings* (cdr *active-windings*))
+            ((after-func old-top))))
+
+      (define (set-active-windings! new-ws)
+         (unless (eq? new-ws *active-windings*)
+            (let ((shared (shared-tail new-ws *active-windings*)))
+
+               ;;Define the looping functions.
+               ;;Exit the old list.  Do deeper ones last.  Don't do
+               ;;any shared ones.
+               (define (pop-many)
+                  (unless (eq? *active-windings* shared)
+                     (deactivate-top-winding!)
+                     (pop-many)))
+               ;;Enter the new list.  Do deeper ones first so that the
+               ;;deeper windings will already be active.  Don't do any
+               ;;shared ones.
+               (define (push-many new-ws)
+                  (unless (eq? new-ws shared)
+                     (push-many (cdr new-ws))
+                     (activate-winding! (car new-ws))))
+
+               ;;Do it.
+               (pop-many)
+               (push-many new-ws))))
+
+      ;;The definitions themselves.
+      (eval
+         `(define call-with-current-continuation
+             ;;It internally uses the built-in call/cc, so capture it.
+             ,(let ((old-c/cc call-with-current-continuation))
+                 (lambda (func)
+                    ;;Use old call/cc to get the continuation.
+                    (old-c/cc
+                       (lambda (continuation)
+                          ;;Call func with not the continuation itself
+                          ;;but a procedure that adjusts the active
+                          ;;windings to what they were when we made
+                          ;;this, and only then calls the
+                          ;;continuation.
+                          (func
+                             (let ((current-ws *active-windings*))
+                                (lambda (x)
+                                   (set-active-windings! current-ws)
+                                   (continuation x)))))))))
+         outer-env)
+      ;;We can't just say "define (dynamic-wind before thunk after)"
+      ;;because the lambda it's defined to lives in this environment,
+      ;;not in the global environment.
+      (eval
+         `(define dynamic-wind
+             ,(lambda (before thunk after)
+                 ;;Make a new winding
+                 (activate-winding! (make-winding before after))
+                 (let ((result (thunk)))
+                    ;;Get rid of the new winding.
+                    (deactivate-top-winding!)
+                    ;;The return value is that of thunk.
+                    result)))
+         outer-env)))
+
+(define call/cc call-with-current-continuation)
+
+
+;;;;; atom? and equal? written by a.k
+
+;;;; atom?
+(define (atom? x)
+  (not (pair? x)))
+
+;;;;    equal?
+(define (equal? x y)
+     (cond
+          ((pair? x)
+               (and (pair? y)
+                    (equal? (car x) (car y))
+                    (equal? (cdr x) (cdr y))))
+          ((vector? x)
+               (and (vector? y) (vector-equal? x y)))
+          ((string? x)
+               (and (string? y) (string=? x y)))
+          (else (eqv? x y))))
+
+;;;; (do ((var init inc) ...) (endtest result ...) body ...)
+;;
+(macro do
+  (lambda (do-macro)
+    (apply (lambda (do vars endtest . body)
+             (let ((do-loop (gensym)))
+               `(letrec ((,do-loop
+                           (lambda ,(map (lambda (x)
+                                           (if (pair? x) (car x) x))
+                                      `,vars)
+                             (if ,(car endtest)
+                               (begin ,@(cdr endtest))
+                               (begin
+                                 ,@body
+                                 (,do-loop
+                                   ,@(map (lambda (x)
+                                            (cond
+                                              ((not (pair? x)) x)
+                                              ((< (length x) 3) (car x))
+                                              (else (car (cdr (cdr x))))))
+                                       `,vars)))))))
+                  (,do-loop
+                    ,@(map (lambda (x)
+                             (if (and (pair? x) (cdr x))
+                               (car (cdr x))
+                               '()))
+                        `,vars)))))
+      do-macro)))
+
+;;;; generic-member
+(define (generic-member cmp obj lst)
+  (cond
+    ((null? lst) #f)
+    ((cmp obj (car lst)) lst)
+    (else (generic-member cmp obj (cdr lst)))))
+
+(define (memq obj lst)
+     (generic-member eq? obj lst))
+(define (memv obj lst)
+     (generic-member eqv? obj lst))
+(define (member obj lst)
+     (generic-member equal? obj lst))
+
+;;;; generic-assoc
+(define (generic-assoc cmp obj alst)
+     (cond
+          ((null? alst) #f)
+          ((cmp obj (caar alst)) (car alst))
+          (else (generic-assoc cmp obj (cdr alst)))))
+
+(define (assq obj alst)
+     (generic-assoc eq? obj alst))
+(define (assv obj alst)
+     (generic-assoc eqv? obj alst))
+(define (assoc obj alst)
+     (generic-assoc equal? obj alst))
+
+(define (acons x y z) (cons (cons x y) z))
+
+;;;; Handy for imperative programs
+;;;; Used as: (define-with-return (foo x y) .... (return z) ...)
+(macro (define-with-return form)
+     `(define ,(cadr form)
+          (call/cc (lambda (return) ,@(cddr form)))))
+
+;;;; Simple exception handling
+;
+;    Exceptions are caught as follows:
+;
+;         (catch (do-something to-recover and-return meaningful-value)
+;              (if-something goes-wrong)
+;              (with-these calls))
+;
+;    "Catch" establishes a scope spanning multiple call-frames
+;    until another "catch" is encountered.
+;
+;    Exceptions are thrown with:
+;
+;         (throw "message")
+;
+;    If used outside a (catch ...), reverts to (error "message)
+
+(define *handlers* (list))
+
+(define (push-handler proc)
+     (set! *handlers* (cons proc *handlers*)))
+
+(define (pop-handler)
+     (let ((h (car *handlers*)))
+          (set! *handlers* (cdr *handlers*))
+          h))
+
+(define (more-handlers?)
+     (pair? *handlers*))
+
+(define (throw . x)
+     (if (more-handlers?)
+          (apply (pop-handler))
+          (apply error x)))
+
+(macro (catch form)
+     (let ((label (gensym)))
+          `(call/cc (lambda (exit)
+               (push-handler (lambda () (exit ,(cadr form))))
+               (let ((,label (begin ,@(cddr form))))
+                    (pop-handler)
+                    ,label)))))
+
+(define *error-hook* throw)
+
+
+;;;;; Definition of MAKE-ENVIRONMENT, to be used with two-argument EVAL
+
+(macro (make-environment form)
+     `(apply (lambda ()
+               ,@(cdr form)
+               (current-environment))))
+
+(define-macro (eval-polymorphic x . envl)
+  (display envl)
+  (let* ((env (if (null? envl) (current-environment) (eval (car envl))))
+         (xval (eval x env)))
+    (if (closure? xval)
+      (make-closure (get-closure-code xval) env)
+      xval)))
+
+; Redefine this if you install another package infrastructure
+; Also redefine 'package'
+(define *colon-hook* eval)
+
+;;;;; I/O
+
+(define (input-output-port? p)
+     (and (input-port? p) (output-port? p)))
+
+(define (close-port p)
+     (cond
+          ((input-output-port? p) (close-input-port p) (close-output-port p))
+          ((input-port? p) (close-input-port p))
+          ((output-port? p) (close-output-port p))
+          (else (throw "Not a port" p))))
+
+(define (call-with-input-file s p)
+     (let ((inport (open-input-file s)))
+          (if (eq? inport #f)
+               #f
+               (let ((res (p inport)))
+                    (close-input-port inport)
+                    res))))
+
+(define (call-with-output-file s p)
+     (let ((outport (open-output-file s)))
+          (if (eq? outport #f)
+               #f
+               (let ((res (p outport)))
+                    (close-output-port outport)
+                    res))))
+
+(define (with-input-from-file s p)
+     (let ((inport (open-input-file s)))
+          (if (eq? inport #f)
+               #f
+               (let ((prev-inport (current-input-port)))
+                    (set-input-port inport)
+                    (let ((res (p)))
+                         (close-input-port inport)
+                         (set-input-port prev-inport)
+                         res)))))
+
+(define (with-output-to-file s p)
+     (let ((outport (open-output-file s)))
+          (if (eq? outport #f)
+               #f
+               (let ((prev-outport (current-output-port)))
+                    (set-output-port outport)
+                    (let ((res (p)))
+                         (close-output-port outport)
+                         (set-output-port prev-outport)
+                         res)))))
+
+(define (with-input-output-from-to-files si so p)
+     (let ((inport (open-input-file si))
+           (outport (open-input-file so)))
+          (if (not (and inport outport))
+               (begin
+                    (close-input-port inport)
+                    (close-output-port outport)
+                    #f)
+               (let ((prev-inport (current-input-port))
+                     (prev-outport (current-output-port)))
+                    (set-input-port inport)
+                    (set-output-port outport)
+                    (let ((res (p)))
+                         (close-input-port inport)
+                         (close-output-port outport)
+                         (set-input-port prev-inport)
+                         (set-output-port prev-outport)
+                         res)))))
+
+; Random number generator (maximum cycle)
+(define *seed* 1)
+(define (random-next)
+     (let* ((a 16807) (m 2147483647) (q (quotient m a)) (r (modulo m a)))
+          (set! *seed*
+               (-   (* a (- *seed*
+                         (* (quotient *seed* q) q)))
+                    (* (quotient *seed* q) r)))
+          (if (< *seed* 0) (set! *seed* (+ *seed* m)))
+          *seed*))
+;; SRFI-0
+;; COND-EXPAND
+;; Implemented as a macro
+(define *features* '(srfi-0 tinyscheme))
+
+(define-macro (cond-expand . cond-action-list)
+  (cond-expand-runtime cond-action-list))
+
+(define (cond-expand-runtime cond-action-list)
+  (if (null? cond-action-list)
+      #t
+      (if (cond-eval (caar cond-action-list))
+          `(begin ,@(cdar cond-action-list))
+          (cond-expand-runtime (cdr cond-action-list)))))
+
+(define (cond-eval-and cond-list)
+  (foldr (lambda (x y) (and (cond-eval x) (cond-eval y))) #t cond-list))
+
+(define (cond-eval-or cond-list)
+  (foldr (lambda (x y) (or (cond-eval x) (cond-eval y))) #f cond-list))
+
+(define (cond-eval condition)
+  (cond
+    ((symbol? condition)
+       (if (member condition *features*) #t #f))
+    ((eq? condition #t) #t)
+    ((eq? condition #f) #f)
+    (else (case (car condition)
+            ((and) (cond-eval-and (cdr condition)))
+            ((or) (cond-eval-or (cdr condition)))
+            ((not) (if (not (null? (cddr condition)))
+                     (error "cond-expand : 'not' takes 1 argument")
+                     (not (cond-eval (cadr condition)))))
+            (else (error "cond-expand : unknown operator" (car condition)))))))
+
+(gc-verbose #f)
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