/usr/share/gauche-0.9/0.9.5/lib/text/diff.scm is in gauche 0.9.5-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | ;;;; diff.scm -- LCS for Scheme
;;; Created: <2002-06-21 15:36:46 foof>
;;; Time-stamp: <2003-02-15 00:09:55 foof>
;;; Author: Alex Shinn <foof@synthcode.com>
(define-module text.diff
(use util.lcs)
(export diff diff-report)
)
(select-module text.diff)
;; aux. fun to convert arg to a list
(define (source->list src reader)
(port->list reader
(cond [(port? src) src]
[(string? src) (open-input-string src)]
[else (error "don't know how to diff from:" src)])))
;; lcs on text. Returns edit-list (as defined in lcs-edit-list).
(define (diff a b :key (reader read-line) (equal equal?))
(lcs-edit-list (source->list a reader)
(source->list b reader)
equal))
(define (write-line-diff line type)
(case type
[(+) (format #t "+ ~A\n" line)]
[(-) (format #t "- ~A\n" line)]
[else (format #t " ~A\n" line)]))
(define (diff-report a b :key (writer write-line-diff)
(reader read-line) (equal equal?))
(lcs-fold (^[line _] [writer line '-])
(^[line _] (writer line '+))
(^[line _] (writer line #f))
#f
(source->list a reader)
(source->list b reader)
equal))
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