;"guile.init" Configuration file for SLIB for Guile	-*-scheme-*-
;;; Author: Aubrey Jaffer
;;; Author: Andy Wingo
;;;
;;; This code is in the public domain.

(cond-expand
 (guile-2)
 (else
  (error "Guile 2.0 or later is required.")))

(define-module (ice-9 slib)
  #:use-module ((ice-9 popen) #:select (open-input-pipe close-pipe))
  #:use-module ((ice-9 rdelim) #:select (read-line read-line! write-line))
  #:re-export (read-line read-line! write-line)
  #:export (<=?
            <?
            =?
            >=?
            >?
            A:bool
            A:fixN16b
            A:fixN32b
            A:fixN64b
            A:fixN8b
            A:fixZ16b
            A:fixZ32b
            A:fixZ64b
            A:fixZ8b
            A:floC128b
            A:floC16b
            A:floC32b
            A:floC64b
            A:floR128b
            A:floR128d
            A:floR16b
            A:floR32b
            A:floR32d
            A:floR64b
            A:floR64d
            a:bool
            a:fixn16b
            a:fixn32b
            a:fixn64b
            a:fixn8b
            a:fixz16b
            a:fixz32b
            a:fixz64b
            a:fixz8b
            a:floc128b
            a:floc16b
            a:floc32b
            a:floc64b
            a:flor128b
            a:flor128d
            a:flor16b
            a:flor32b
            a:flor32d
            a:flor64b
            a:flor64d
            any-bits-set?
            arithmetic-shift
            array-indexes
            array-null?
            array:copy!
            ;; ac32
            ;; ac64
            ;; ar32
            ;; ar64
            ;; as16
            ;; as32
            ;; as64
            ;; as8
            ;; at1
            ;; au16
            ;; au32
            ;; au64
            ;; au8
            bit-field
            bit-reverse
            bit-set?
            bitwise-and
            bitwise-if
            bitwise-ior
            bitwise-merge
            bitwise-not
            bitwise-xor
            booleans->integer
            browse-url
            call-with-open-ports
            copy-bit
            copy-bit-field
            create-array
            ;;define
            defmacro:eval
            defmacro:expand*
            defmacro:load
            ;;delete-file
            difftime
            ;;file-position
            first-set-bit
            gentemp
            home-vicinity
            implementation-vicinity
            integer->list
            library-vicinity
            list->array
            list->integer
            log2-binary-factors
            logical:ash
            logical:bit-extract
            logical:integer-expt
            logical:integer-length
            ;;logical:ipow-by-squaring
            logical:logand
            logical:logcount
            logical:logior
            logical:lognot
            logical:logxor
            macro:eval
            macro:load
            make-array
            make-exchanger
            make-random-state
            ;;make-uniform-wrapper
            make-vicinity
            ;; nil
            offset-time
            ;;open-file
            output-port-height
            output-port-width
            pathname->vicinity
            program-vicinity
            random:chunk
            reverse-bit-field
            rotate-bit-field
            scheme-implementation-home-page
            scheme-implementation-type
            scheme-implementation-version
            ;; slib-module
            slib:error
            slib:eval
            slib:eval-load
            slib:exit
            ;; slib:features
            slib:form-feed
            slib:load
            slib:load-compiled
            slib:load-source
            slib:tab
            slib:warn
            software-type
            sub-vicinity
            ;;system
            system->line
            ;; t
            user-vicinity
            vector->array
            ;; vicinity:suffix?
            ;; with-load-pathname
            )
  #:replace (file-position
             system
             open-file
             delete-file
             char-code-limit
             scheme-file-suffix
             gentemp
             make-array
             list->array
             provide
             provided?))

(define slib-module (current-module))

(module-export-all! (current-module))

;;; (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) 'guile)

;;; (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://www.gnu.org/software/guile/")

;;; (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
  (cond ((getenv "GUILE_IMPLEMENTATION_PATH")
	 => (lambda (path) (lambda () path)))
	(else %site-dir)))

;;; (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")
             (string-append (canonicalize-path (dirname (current-filename)))
                            "/")
             ;; A fallback; normally shouldn't be reached.
             "/usr/share/slib/")))
    (lambda () library-path)))

;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.
(define (home-vicinity)
  (let ((home (or (getenv "HOME")
                  (false-if-exception
                   (passwd:dir (getpwnam (cuserid)))))))
    (and home
	 (if (eqv? #\/ (string-ref home (+ -1 (string-length home))))
             home
             (string-append home "/")))))
;@
(define (user-vicinity)
  "")
;@
(define vicinity:suffix?
  (case (software-type)
    ((ms-dos windows)
     (lambda (chr) (memv chr '(#\/ #\\))))
    (else
     (lambda (chr) (eqv? chr #\/)))))
;@
(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 program-vicinity
  (make-parameter (getcwd) pathname->vicinity))
;@
(define sub-vicinity
  (let ((*vicinity-suffix*
         (case (software-type)
           ((ms-dos windows atarist os/2) "\\")
           ((unix coherent plan9 amiga) "/"))))
    (lambda (vic name)
      (string-append vic name *vicinity-suffix*))))
;@
(define (make-vicinity <pathname>) <pathname>)
;@
(define (with-load-pathname path thunk)
  (parameterize ((program-vicinity 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
    srfi-96

    ;; 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
    hash				;HASH, HASHV, HASHQ

    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-0                         ;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
    line-i/o
;;;	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

    logical
    random				;Random numbers

    array
    array-for-each
    ))

;;@ (FILE-POSITION <port> . <k>)
(define* (file-position port #:optional k)
  (if k
      (seek port k SEEK_SET)
      (ftell port)))

;;; (OUTPUT-PORT-WIDTH <port>)
(define (output-port-width . arg) 79)

;;; (OUTPUT-PORT-HEIGHT <port>)
(define (output-port-height . arg) 24)

;; If the program is killed by a signal, /bin/sh normally gives an
;; exit code of 128+signum.  If /bin/sh itself is killed by a signal
;; then we do the same 128+signum here.
;;
;; "status:stop-sig" shouldn't arise here, since system shouldn't be
;; calling waitpid with WUNTRACED, but allow for it anyway, just in
;; case.
(define (system str)
  (define st ((@ (guile) system) str))
  (or (status:exit-val st)
      (+ 128 (or (status:term-sig st)
                 (status:stop-sig st)))))

;;; for line-i/o
(define* (system->line command #:optional tmp)
  ;; TMP is the name of a temporary file, and is unused because we use
  ;; pipes.
  (let ((ipip (open-input-pipe command)))
    (define line (read-line ipip))
    (let ((status (close-pipe ipip)))
      (and (or (eqv? 0 (status:exit-val status))
	       (status:term-sig status)
	       (status:stop-sig status))
	   (if (eof-object? line) "" line)))))

(define (delete-file filename)
  (false-if-exception
   ((@ (guile) delete-file) filename)))

(define (make-exchanger obj)
  (lambda (rep) (let ((old obj)) (set! obj rep) old)))
(define (open-file filename modes)
  ((@ (guile) open-file)
   filename
   (if (symbol? modes)
       (symbol->string modes)
       modes)))
;; This has to be done after the definition so that the original
;; binding will still be visible during the definition.
(if (string>=? (scheme-implementation-version) "1.8")
    (module-replace! (current-module) '(open-file)))

(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))

;; Nothing special to do for this, so straight from
;; Template.scm.  Maybe "sensible-browser" for a debian
;; system would be worth trying too (and would be good on a
;; tty).
(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 '" "'")))

;;; "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 (+ 1 #x10ffff))

;;; SLIB:EVAL is single argument eval using the top-level (user) environment.
(define (slib:eval expression)
  (eval expression (interaction-environment)))

;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exiting not supported.
(define slib:exit quit)

;@
(define scheme-file-suffix
   (lambda () ".scm"))
 
(define (slib:load <pathname>)
  (save-module-excursion
   (lambda ()
     (set-current-module slib-module)
     (load (string-append <pathname> (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 slib: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 slib:load)

(define defmacro:eval slib:eval)
(define defmacro:load slib:load)

(define (defmacro:expand* x)
  (require 'defmacroexpand)
  (defmacro:expand* x))

;@
(define gentemp
  (let ((*gensym-counter* -1))
    (lambda ()
      (set! *gensym-counter* (+ *gensym-counter* 1))
      (string->symbol
       (string-append "slib:G" (number->string *gensym-counter*))))))

;;; If your implementation provides R4RS macros:
(define macro:eval slib:eval)
(define macro:load slib:load-source)

(define slib:warn warn)
(define slib:error error)

;;; define these as appropriate for your system.
(define slib:tab #\tab)
(define slib:form-feed #\page)

;;; {Time}
(define difftime -)
(define offset-time +)

;;; Early version of 'logical is built-in
(define (copy-bit index to bool)
  (if bool
      (logior to (arithmetic-shift 1 index))
      (logand to (lognot (arithmetic-shift 1 index)))))
(define (bit-field n start end)
  (logand (- (expt 2 (- end start)) 1)
	  (arithmetic-shift n (- start))))
(define (bitwise-if mask n0 n1)
  (logior (logand mask n0)
	  (logand (lognot mask) n1)))
(define (copy-bit-field to from start end)
  (bitwise-if (arithmetic-shift (lognot (ash -1 (- end start))) start)
	      (arithmetic-shift from start)
	      to))
(define (rotate-bit-field n count start end)
  (define width (- end start))
  (set! count (modulo count width))
  (let ((mask (lognot (ash -1 width))))
    (define azn (logand mask (arithmetic-shift n (- start))))
    (logior (arithmetic-shift
	     (logior (logand mask (arithmetic-shift azn count))
		     (arithmetic-shift azn (- count width)))
	     start)
	    (logand (lognot (ash mask start)) n))))
(define (log2-binary-factors n)
  (+ -1 (integer-length (logand n (- n)))))
(define (bit-reverse k n)
  (do ((m (if (negative? n) (lognot n) n) (arithmetic-shift m -1))
       (k (+ -1 k) (+ -1 k))
       (rvs 0 (logior (arithmetic-shift rvs 1) (logand 1 m))))
      ((negative? k) (if (negative? n) (lognot rvs) rvs))))
(define (reverse-bit-field n start end)
  (define width (- end start))
  (let ((mask (lognot (ash -1 width))))
    (define zn (logand mask (arithmetic-shift n (- start))))
    (logior (arithmetic-shift (bit-reverse width zn) start)
	    (logand (lognot (ash mask start)) n))))

(define* (integer->list k len)
  (if len
      (do ((idx (+ -1 len) (+ -1 idx))
	   (k k (arithmetic-shift k -1))
	   (lst '() (cons (odd? k) lst)))
	  ((negative? idx) lst))
      (do ((k k (arithmetic-shift k -1))
	   (lst '() (cons (odd? k) lst)))
	  ((<= k 0) lst))))
(define (list->integer bools)
  (do ((bs bools (cdr bs))
       (acc 0 (+ acc acc (if (car bs) 1 0))))
      ((null? bs) acc)))
(define (booleans->integer . bools)
  (list->integer bools))

;;;; SRFI-60 aliases
(define arithmetic-shift ash)
(define bitwise-ior logior)
(define bitwise-xor logxor)
(define bitwise-and logand)
(define bitwise-not lognot)
;;(define bit-count logcount)
(define bit-set?   logbit?)
(define any-bits-set? logtest)
(define first-set-bit log2-binary-factors)
(define bitwise-merge bitwise-if)

;;; array-for-each
(define (array-indexes ra)
  (let ((ra0 (apply make-array '#() (array-shape ra))))
    (array-index-map! ra0 list)
    ra0))
(define (array:copy! dest source)
  (array-map! dest identity source))
;; DIMENSIONS->UNIFORM-ARRAY and list->uniform-array in Guile-1.6.4
;; cannot make empty arrays.
(define make-array
  (lambda (prot . args)
    (dimensions->uniform-array args (array-prototype prot)
                               (apply array-ref prot
                                      (map car (array-shape prot))))))

(define (list->array rank proto lst)
  (define dimensions
    (do ((shp '() (cons (length row) shp))
	 (row lst (car lst))
	 (rnk (+ -1 rank) (+ -1 rnk)))
	((negative? rnk) (reverse shp))))
  (let ((nra (apply make-array proto dimensions)))
    (define (l2ra dims idxs row)
      (cond ((null? dims)
	     (apply array-set! nra row (reverse idxs)))
	    ((if (not (eqv? (car dims) (length row)))
		 (slib:error 'list->array
			     'non-rectangular 'array dims dimensions))
	     (do ((idx 0 (+ 1 idx))
		  (row row (cdr row)))
		 ((>= idx (car dims)))
	       (l2ra (cdr dims) (cons idx idxs) (car row))))))
    (l2ra dimensions '() lst)
    nra))

(define (vector->array vect prototype . dimensions)
  (define vdx (vector-length vect))
  (if (not (eqv? vdx (apply * dimensions)))
      (slib:error 'vector->array vdx '<> (cons '* dimensions)))
  (let ((ra (apply make-array prototype dimensions)))
    (define (v2ra dims idxs)
      (cond ((null? dims)
	     (set! vdx (+ -1 vdx))
	     (apply array-set! ra (vector-ref vect vdx) (reverse idxs)))
	    (else
	     (do ((idx (+ -1 (car dims)) (+ -1 idx)))
		 ((negative? idx) vect)
	       (v2ra (cdr dims) (cons idx idxs))))))
    (v2ra dimensions '())
    ra))
(define (array->vector ra)
  (define dims (array-dimensions ra))
  (let* ((vdx (apply * dims))
	 (vect (make-vector vdx)))
    (define (ra2v dims idxs)
      (if (null? dims)
	  (let ((val (apply array-ref ra (reverse idxs))))
	    (set! vdx (+ -1 vdx))
	    (vector-set! vect vdx val))
	  (do ((idx (+ -1 (car dims)) (+ -1 idx)))
	      ((negative? idx) vect)
	    (ra2v (cdr dims) (cons idx idxs)))))
    (ra2v dims '())
    vect))

(define create-array make-array)
(define (make-uniform-wrapper prot)
  (if (string? prot) (set! prot (string->number prot)))
  (if prot
      (lambda opt
        (if (null? opt)
            (list->uniform-array 1 prot (list prot))
            (list->uniform-array 0 prot (car opt))))
      vector))
(define ac64 (make-uniform-wrapper "+i"))
(define ac32 ac64)
(define ar64 (make-uniform-wrapper "1/3"))
(define ar32 (make-uniform-wrapper "1."))
(define as64 vector)
(define as32 (make-uniform-wrapper -32))
(define as16 as32)
(define as8  as32)
(define au64 vector)
(define au32 (make-uniform-wrapper  32))
(define au16 au32)
(define au8  au32)
(define at1  (make-uniform-wrapper  #t))

;;; New SRFI-58 names
;; flonums
(define A:floC128b ac64)
(define A:floC64b ac64)
(define A:floC32b ac32)
(define A:floC16b ac32)
(define A:floR128b ar64)
(define A:floR64b ar64)
(define A:floR32b ar32)
(define A:floR16b ar32)
;; decimal flonums
(define A:floR128d ar64)
(define A:floR64d ar64)
(define A:floR32d ar32)
;; fixnums
(define A:fixZ64b as64)
(define A:fixZ32b as32)
(define A:fixZ16b as16)
(define A:fixZ8b  as8)
(define A:fixN64b au64)
(define A:fixN32b au32)
(define A:fixN16b au16)
(define A:fixN8b  au8)
(define A:bool    at1)

;;; And case-insensitive versions
;; flonums
(define a:floc128b ac64)
(define a:floc64b ac64)
(define a:floc32b ac32)
(define a:floc16b ac32)
(define a:flor128b ar64)
(define a:flor64b ar64)
(define a:flor32b ar32)
(define a:flor16b ar32)
;; decimal flonums
(define a:flor128d ar64)
(define a:flor64d ar64)
(define a:flor32d ar32)
;; fixnums
(define a:fixz64b as64)
(define a:fixz32b as32)
(define a:fixz16b as16)
(define a:fixz8b  as8)
(define a:fixn64b au64)
(define a:fixn32b au32)
(define a:fixn16b au16)
(define a:fixn8b  au8)
(define a:bool    at1)

;;; {Random numbers}
(define (make-random-state . args)
  (let ((seed (if (null? args) *random-state* (car args))))
    (cond ((string? seed))
	  ((number? seed) (set! seed (number->string seed)))
	  (else (let ()
		  (require 'object->string)
		  (set! seed (object->limited-string seed 50)))))
    (seed->random-state seed)))
(define (random:chunk sta) (random 256 sta))

(define t #t)
(define nil #f)

;;; rev2-procedures
(define <? <)
(define <=? <=)
(define =? =)
(define >? >)
(define >=? >=)

(slib:load (in-vicinity (library-vicinity) "require"))