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;;;; "ppfile.scm". Pretty print a Scheme file.
;Copyright (C) 1993, 1994 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.
(require 'pretty-print)
(define (pprint-filter-file inport filter . optarg)
((lambda (fun)
(if (input-port? inport)
(fun inport)
(call-with-input-file inport fun)))
(lambda (port)
((lambda (fun)
(let ((outport
(if (null? optarg) (current-output-port) (car optarg))))
(if (output-port? outport)
(fun outport)
(call-with-output-file outport fun))))
(lambda (export)
(let ((old-load-pathname *load-pathname*))
(set! *load-pathname* inport)
(letrec ((lp (lambda (c)
(cond ((eof-object? c))
((char-whitespace? c)
(display (read-char port) export)
(lp (peek-char port)))
((char=? #\; c)
(cmt c))
(else (sx)))))
(cmt (lambda (c)
(cond ((eof-object? c))
((char=? #\newline c)
(display (read-char port) export)
(lp (peek-char port)))
(else
(display (read-char port) export)
(cmt (peek-char port))))))
(sx (lambda ()
(let ((o (read port)))
(cond ((eof-object? o))
(else
(pretty-print (filter o) export)
;; pretty-print seems to have extra newline
(let ((c (peek-char port)))
(cond ((eqv? #\newline c)
(read-char port)
(set! c (peek-char port))))
(lp c))))))))
(lp (peek-char port)))
(set! *load-pathname* old-load-pathname)))))))
(define (pprint-file ifile . optarg)
(pprint-filter-file ifile
(lambda (x) x)
(if (null? optarg) (current-output-port) (car optarg))))
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