/usr/share/racket/pkgs/games/show-help.rkt is in racket-common 6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #lang racket
(require racket/gui)
(provide show-help)
(define show-help
(lambda (collections frame-title [verbatim? #f])
(let* ([f #f]
[f%
(class frame%
(define/augment (on-close)
(set! f #f))
(super-instantiate () (label frame-title)))])
(lambda ()
(if f
(send f show #t)
(let* ([frame (make-object f%)]
[t (make-object text%)]
[c (new editor-canvas% [parent frame] [editor t] [style '(auto-hscroll)])])
(send c min-width 500)
(send c min-height 300)
(send t auto-wrap (not verbatim?))
(call-with-input-file (build-path
(apply collection-path collections)
"doc.txt")
(lambda (p)
(let loop ()
(let ([l (read-line p)])
(unless (eof-object? l)
(cond
[verbatim?
(send t insert l)
(send t insert #\newline)]
[(regexp-match #rx"^[*][*].*[*][*]$" l)
;; Skip
(void)]
[(string=? l "")
(unless (zero? (send t last-position))
(send t insert #\newline)
(send t insert #\newline))]
[(and (regexp-match #rx"^-+$" l)
(= (string-length l)
(- (send t last-position)
(send t paragraph-start-position (send t last-paragraph))
1)))
;; Change previous line style to title
(let ([end (send t last-position)])
(send t change-style
(send (make-object style-delta% 'change-weight 'bold)
set-delta-foreground
"blue")
(- end 1 (string-length l)) (- end 1)))]
[else
(let ([l (regexp-replace #rx" +$"
(regexp-replace #rx"^ +" l "")
"")])
(send t insert l)
(when (regexp-match #rx"^[*]" l)
(send t set-paragraph-margins
(send t position-paragraph (send t last-position))
16 32 0))
(send t insert #\space))])
(loop)))))
#:mode 'text)
(when verbatim?
(send t change-style
(make-object style-delta% 'change-family 'modern)
0 (send t last-position)))
(send t lock #t)
(send t set-position 0 0)
(send frame show #t)
(set! f frame)))))))
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