boot-9.scm

MSYS在windows下模拟了一个类unix的终端

;;
;; Apply f to successive elements of l until exhaustion or while f returns #f.
;; If returning early, return the return value of f.
;;
(define (or-map f lst)
  (let loop ((result #f)
	     (l lst))
    (or result
	(and (not (null? l))
	     (loop (f (car l)) (cdr l))))))



(if (provided? 'posix)
    (primitive-load-path "ice-9/posix.scm"))

(if (provided? 'socket)
    (primitive-load-path "ice-9/networking.scm"))

(define file-exists?
  (if (provided? 'posix)
      (lambda (str)
	(access? str F_OK))
      (lambda (str)
	(let ((port (catch 'system-error (lambda () (open-file str OPEN_READ))
			   (lambda args #f))))
	  (if port (begin (close-port port) #t)
	      #f)))))

(define file-is-directory?
  (if (provided? 'posix)
      (lambda (str)
	(eq? (stat:type (stat str)) 'directory))
      (lambda (str)
	(let ((port (catch 'system-error
			   (lambda () (open-file (string-append str "/.")
						 OPEN_READ))
			   (lambda args #f))))
	  (if port (begin (close-port port) #t)
	      #f)))))

(define (has-suffix? str suffix)
  (let ((sufl (string-length suffix))
	(sl (string-length str)))
    (and (> sl sufl)
	 (string=? (substring str (- sl sufl) sl) suffix))))

(define (system-error-errno args)
  (if (eq? (car args) 'system-error)
      (car (list-ref args 4))
      #f))


;;; {Error Handling}
;;;

(define (error . args)
  (save-stack)
  (if (null? args)
      (scm-error 'misc-error #f "?" #f #f)
      (let loop ((msg "~A")
		 (rest (cdr args)))
	(if (not (null? rest))
	    (loop (string-append msg " ~S")
		  (cdr rest))
	    (scm-error 'misc-error #f msg args #f)))))

;; bad-throw is the hook that is called upon a throw to a an unhandled
;; key (unless the throw has four arguments, in which case
;; it's usually interpreted as an error throw.)
;; If the key has a default handler (a throw-handler-default property),
;; it is applied to the throw.
;;
(define (bad-throw key . args)
  (let ((default (symbol-property key 'throw-handler-default)))
    (or (and default (apply default key args))
	(apply error "unhandled-exception:" key args))))



(define (tm:sec obj) (vector-ref obj 0))
(define (tm:min obj) (vector-ref obj 1))
(define (tm:hour obj) (vector-ref obj 2))
(define (tm:mday obj) (vector-ref obj 3))
(define (tm:mon obj) (vector-ref obj 4))
(define (tm:year obj) (vector-ref obj 5))
(define (tm:wday obj) (vector-ref obj 6))
(define (tm:yday obj) (vector-ref obj 7))
(define (tm:isdst obj) (vector-ref obj 8))
(define (tm:gmtoff obj) (vector-ref obj 9))
(define (tm:zone obj) (vector-ref obj 10))

(define (set-tm:sec obj val) (vector-set! obj 0 val))
(define (set-tm:min obj val) (vector-set! obj 1 val))
(define (set-tm:hour obj val) (vector-set! obj 2 val))
(define (set-tm:mday obj val) (vector-set! obj 3 val))
(define (set-tm:mon obj val) (vector-set! obj 4 val))
(define (set-tm:year obj val) (vector-set! obj 5 val))
(define (set-tm:wday obj val) (vector-set! obj 6 val))
(define (set-tm:yday obj val) (vector-set! obj 7 val))
(define (set-tm:isdst obj val) (vector-set! obj 8 val))
(define (set-tm:gmtoff obj val) (vector-set! obj 9 val))
(define (set-tm:zone obj val) (vector-set! obj 10 val))

(define (tms:clock obj) (vector-ref obj 0))
(define (tms:utime obj) (vector-ref obj 1))
(define (tms:stime obj) (vector-ref obj 2))
(define (tms:cutime obj) (vector-ref obj 3))
(define (tms:cstime obj) (vector-ref obj 4))

(define file-position ftell)
(define (file-set-position port offset . whence)
  (let ((whence (if (eq? whence '()) SEEK_SET (car whence))))
    (seek port offset whence)))

(define (move->fdes fd/port fd)
  (cond ((integer? fd/port)
	 (dup->fdes fd/port fd)
	 (close fd/port)
	 fd)
	(else
	 (primitive-move->fdes fd/port fd)
	 (set-port-revealed! fd/port 1)
	 fd/port)))

(define (release-port-handle port)
  (let ((revealed (port-revealed port)))
    (if (> revealed 0)
	(set-port-revealed! port (- revealed 1)))))

(define (dup->port port/fd mode . maybe-fd)
  (let ((port (fdopen (apply dup->fdes port/fd maybe-fd)
		      mode)))
    (if (pair? maybe-fd)
	(set-port-revealed! port 1))
    port))

(define (dup->inport port/fd . maybe-fd)
  (apply dup->port port/fd "r" maybe-fd))

(define (dup->outport port/fd . maybe-fd)
  (apply dup->port port/fd "w" maybe-fd))

(define (dup port/fd . maybe-fd)
  (if (integer? port/fd)
      (apply dup->fdes port/fd maybe-fd)
      (apply dup->port port/fd (port-mode port/fd) maybe-fd)))

(define (duplicate-port port modes)
  (dup->port port modes))

(define (fdes->inport fdes)
  (let loop ((rest-ports (fdes->ports fdes)))
    (cond ((null? rest-ports)
	   (let ((result (fdopen fdes "r")))
	     (set-port-revealed! result 1)
	     result))
	  ((input-port? (car rest-ports))
	   (set-port-revealed! (car rest-ports)
			       (+ (port-revealed (car rest-ports)) 1))
	   (car rest-ports))
	  (else
	   (loop (cdr rest-ports))))))

(define (fdes->outport fdes)
  (let loop ((rest-ports (fdes->ports fdes)))
    (cond ((null? rest-ports)
	   (let ((result (fdopen fdes "w")))
	     (set-port-revealed! result 1)
	     result))
	  ((output-port? (car rest-ports))
	   (set-port-revealed! (car rest-ports)
			       (+ (port-revealed (car rest-ports)) 1))
	   (car rest-ports))
	  (else
	   (loop (cdr rest-ports))))))

(define (port->fdes port)
  (set-port-revealed! port (+ (port-revealed port) 1))
  (fileno port))

(define (setenv name value)
  (if value
      (putenv (string-append name "=" value))
      (putenv name)))


;;; {Load Paths}
;;;

;;; Here for backward compatability
;;
(define scheme-file-suffix (lambda () ".scm"))

(define (in-vicinity vicinity file)
  (let ((tail (let ((len (string-length vicinity)))
		(if (zero? len)
		    #f
		    (string-ref vicinity (- len 1))))))
    (string-append vicinity
		   (if (or (not tail)
			   (eq? tail #\/))
		       ""
		       "/")
		   file)))


;;; {Help for scm_shell}
;;; The argument-processing code used by Guile-based shells generates
;;; Scheme code based on the argument list.  This page contains help
;;; functions for the code it generates.

(define (command-line) (program-arguments))

;; This is mostly for the internal use of the code generated by
;; scm_compile_shell_switches.
(define (load-user-init)
  (let* ((home (or (getenv "HOME")
		   (false-if-exception (passwd:dir (getpwuid (getuid))))
		   "/"))  ;; fallback for cygwin etc.
	 (init-file (in-vicinity home ".guile")))
    (if (file-exists? init-file)
	(primitive-load init-file))))


;;; {Loading by paths}

;;; Load a Scheme source file named NAME, searching for it in the
;;; directories listed in %load-path, and applying each of the file
;;; name extensions listed in %load-extensions.
(define (load-from-path name)
  (start-stack 'load-stack
	       (primitive-load-path name)))



;;; {Transcendental Functions}
;;;
;;; Derived from "Transcen.scm", Complex trancendental functions for SCM.
;;; Written by Jerry D. Hedden, (C) FSF.
;;; See the file `COPYING' for terms applying to this program.
;;;

(define (exp z)
  (if (real? z) ($exp z)
      (make-polar ($exp (real-part z)) (imag-part z))))

(define (log z)
  (if (and (real? z) (>= z 0))
      ($log z)
      (make-rectangular ($log (magnitude z)) (angle z))))

(define (sqrt z)
  (if (real? z)
      (if (negative? z) (make-rectangular 0 ($sqrt (- z)))
	  ($sqrt z))
      (make-polar ($sqrt (magnitude z)) (/ (angle z) 2))))

(define expt
  (let ((integer-expt integer-expt))
    (lambda (z1 z2)
      (cond ((integer? z2)
             (if (negative? z2)
		 (/ 1 (integer-expt z1 (- z2)))
		 (integer-expt z1 z2)))
	    ((and (real? z2) (real? z1) (>= z1 0))
	     ($expt z1 z2))
	    (else
	     (exp (* z2 (log z1))))))))

(define (sinh z)
  (if (real? z) ($sinh z)
      (let ((x (real-part z)) (y (imag-part z)))
	(make-rectangular (* ($sinh x) ($cos y))
			  (* ($cosh x) ($sin y))))))
(define (cosh z)
  (if (real? z) ($cosh z)
      (let ((x (real-part z)) (y (imag-part z)))
	(make-rectangular (* ($cosh x) ($cos y))
			  (* ($sinh x) ($sin y))))))
(define (tanh z)
  (if (real? z) ($tanh z)
      (let* ((x (* 2 (real-part z)))
	     (y (* 2 (imag-part z)))
	     (w (+ ($cosh x) ($cos y))))
	(make-rectangular (/ ($sinh x) w) (/ ($sin y) w)))))

(define (asinh z)
  (if (real? z) ($asinh z)
      (log (+ z (sqrt (+ (* z z) 1))))))

(define (acosh z)
  (if (and (real? z) (>= z 1))
      ($acosh z)
      (log (+ z (sqrt (- (* z z) 1))))))

(define (atanh z)
  (if (and (real? z) (> z -1) (< z 1))
      ($atanh z)
      (/ (log (/ (+ 1 z) (- 1 z))) 2)))

(define (sin z)
  (if (real? z) ($sin z)
      (let ((x (real-part z)) (y (imag-part z)))
	(make-rectangular (* ($sin x) ($cosh y))
			  (* ($cos x) ($sinh y))))))
(define (cos z)
  (if (real? z) ($cos z)
      (let ((x (real-part z)) (y (imag-part z)))
	(make-rectangular (* ($cos x) ($cosh y))
			  (- (* ($sin x) ($sinh y)))))))
(define (tan z)
  (if (real? z) ($tan z)
      (let* ((x (* 2 (real-part z)))
	     (y (* 2 (imag-part z)))
	     (w (+ ($cos x) ($cosh y))))
	(make-rectangular (/ ($sin x) w) (/ ($sinh y) w)))))

(define (asin z)
  (if (and (real? z) (>= z -1) (<= z 1))
      ($asin z)
      (* -i (asinh (* +i z)))))

(define (acos z)
  (if (and (real? z) (>= z -1) (<= z 1))
      ($acos z)
      (+ (/ (angle -1) 2) (* +i (asinh (* +i z))))))

(define (atan z . y)
  (if (null? y)
      (if (real? z) ($atan z)
	  (/ (log (/ (- +i z) (+ +i z))) +2i))
      ($atan2 z (car y))))

(define (log10 arg)
  (/ (log arg) (log 10)))



;;; {Reader Extensions}
;;;

;;; Reader code for various "#c" forms.
;;;

(read-hash-extend #\' (lambda (c port)
			(read port)))

(define read-eval? (make-fluid))
(fluid-set! read-eval? #f)
(read-hash-extend #\.
                  (lambda (c port)
                    (if (fluid-ref read-eval?)
                        (eval (read port) (interaction-environment))
                        (error
                         "#. read expansion found and read-eval? is #f."))))


;;; {Command Line Options}
;;;

(define (get-option argv kw-opts kw-args return)
  (cond
   ((null? argv)
    (return #f #f argv))

   ((or (not (eq? #\- (string-ref (car argv) 0)))
	(eq? (string-length (car argv)) 1))
    (return 'normal-arg (car argv) (cdr argv)))

   ((eq? #\- (string-ref (car argv) 1))
    (let* ((kw-arg-pos (or (string-index (car argv) #\=)
			   (string-length (car argv))))
	   (kw (symbol->keyword (substring (car argv) 2 kw-arg-pos)))
	   (kw-opt? (member kw kw-opts))
	   (kw-arg? (member kw kw-args))
	   (arg (or (and (not (eq? kw-arg-pos (string-length (car argv))))
			 (substring (car argv)
				    (+ kw-arg-pos 1)
				    (string-length (car argv))))
		    (and kw-arg?
			 (begin (set! argv (cdr argv)) (car argv))))))
      (if (or kw-opt? kw-arg?)
	  (return kw arg (cdr argv))
	  (return 'usage-error kw (cdr argv)))))

   (else
    (let* ((char (substring (car argv) 1 2))
	   (kw (symbol->keyword char)))
      (cond

       ((member kw kw-opts)
	(let* ((rest-car (substring (car argv) 2 (string-length (car argv))))
	       (new-argv (if (= 0 (string-length rest-car))
			     (cdr argv)
			     (cons (string-append "-" rest-car) (cdr argv)))))
	  (return kw #f new-argv)))

       ((member kw kw-args)
	(let* ((rest-car (substring (car argv) 2 (string-length (car argv))))
	       (arg (if (= 0 (string-length rest-car))
			(cadr argv)
			rest-car))
	       (new-argv (if (= 0 (string-length rest-car))
			     (cddr argv)
			     (cdr argv))))
	  (return kw arg new-argv)))

       (else (return 'usage-error kw argv)))))))

(define (for-next-option proc argv kw-opts kw-args)
  (let loop ((argv argv))
    (get-option argv kw-opts kw-args
		(lambda (opt opt-arg argv)
		  (and opt (proc opt opt-arg argv loop))))))

(define (display-usage-report kw-desc)
  (for-each
   (lambda (kw)
     (or (eq? (car kw) #t)
	 (eq? (car kw) 'else)
	 (let* ((opt-desc kw)
		(help (cadr opt-desc))
		(opts (car opt-desc))
		(opts-proper (if (string? (car opts)) (cdr opts) opts))
		(arg-name (if (string? (car opts))
			      (string-append "<" (car opts) ">")
			      ""))
		(left-part (string-append
			    (with-output-to-string
			      (lambda ()
				(map (lambda (x) (display (keyword-symbol x)) (display " "))
				     opts-proper)))
			    arg-name))
		(middle-part (if (and (< (string-length left-part) 30)
				      (< (string-length help) 40))