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;;;; ps-to-png.scm --
;;;;
;;;; source file of the GNU LilyPond music typesetter
;;;;
;;;; (c) 2005 Jan Nieuwenhuizen <janneke@gnu.org>
(define-module (scm ps-to-png))
(use-modules
(ice-9 optargs)
(ice-9 regex)
(ice-9 rw)
(srfi srfi-1)
(srfi srfi-13)
(srfi srfi-14))
;; gettext wrapper for guile < 1.7.2
(if (defined? 'gettext)
(define-public _ gettext)
(define-public (_ x) x))
(define PLATFORM
(string->symbol
(string-downcase
(car (string-tokenize (vector-ref (uname) 0) char-set:letter)))))
(define (re-sub re sub string)
(regexp-substitute/global #f re string 'pre sub 'post))
(define (search-executable names)
(define (helper path lst)
(if (null? (cdr lst))
(car lst)
(if (search-path path (car lst)) (car lst)
(helper path (cdr lst)))))
(let ((path (parse-path (getenv "PATH"))))
(helper path names)))
(define (search-gs)
(search-executable '("gs-nox" "gs-8.15" "gs")))
(define (gulp-port port max-length)
(let ((str (make-string max-length)))
(read-string!/partial str port)
str))
(define (dir-listing dir-name)
(define (dir-helper dir lst)
(let ((e (readdir dir)))
(if (eof-object? e) lst (dir-helper dir (cons e lst)))))
(reverse (dir-helper (opendir dir-name) '())))
(define (dir-re dir re)
(filter (lambda (x) (string-match re x)) (dir-listing dir)))
(define BOUNDING-BOX-RE
"^%%BoundingBox: (-?[0-9]+) (-?[0-9]+) (-?[0-9]+) (-?[0-9]+)")
(define (get-bbox file-name)
(let* ((bbox (string-append file-name ".bbox"))
;; -sOutputFile does not work with bbox?
(cmd (format #t "gs\
-sDEVICE=bbox\
-q\
-dNOPAUSE\
~S\
-c showpage\
-c quit 2>~S"
file-name bbox))
(status (system cmd))
(s (gulp-port (open-file bbox "r") 10240))
(m (string-match BOUNDING_BOX_RE s)))
(display m)
(newline)
(if m
(list->vector
(map (lambda (x) (string->number (car x))) (vector->list m)))
#f)))
(define-public (make-ps-images ps-name . rest)
(let-optional
rest ((resolution 90)
(paper-size "a4")
(rename-page-1? #f)
(verbose? #f))
(let* ((base (basename (re-sub "[.]e?ps" "" ps-name)))
(header (gulp-port (open-file ps-name "r") 10240))
(png1 (string-append base ".png"))
(pngn (string-append base "-page%d.png"))
(pngn-re (re-sub "%d" "[0-9]*" pngn))
(multi-page? (and (string-match "\n%%Pages: " header)
(not (string-match "\n%%Pages: 1\n" header))))
(output-file (if multi-page? pngn png1))
;;png16m is because Lily produces color nowadays.
(cmd (if multi-page?
(format #f "~a\
~a\
-dGraphicsAlphaBits=4\
-dNOPAUSE\
-dTextAlphaBits=4\
-sDEVICE=png16m\
-sOutputFile=~S\
-sPAPERSIZE=~a\
-r~S\
~S\
-c showpage\
-c quit"
(search-gs)
(if verbose? "" "-q")
output-file paper-size resolution ps-name)
(format #f "~a\
~a\
-s\
-dGraphicsAlphaBits=4\
-dEPSCrop\
-dNOPAUSE\
-dTextAlphaBits=4\
-sDEVICE=png16m\
-sOutputFile=~S\
-r~S\
~S\
-c quit"
(search-gs)
(if verbose? "" "-q")
output-file resolution ps-name)))
(foo (for-each delete-file (append (dir-re "." png1)
(dir-re "." pngn-re))))
(bar (if verbose?
(begin
(format (current-error-port) (_ "Invoking `~a'...") cmd)
(newline (current-error-port)))))
(baz
;; The wrapper on windows cannot handle `=' signs,
;; gs has a workaround with #.
(if (eq? PLATFORM 'windows)
(begin
(set! cmd (re-sub "=" "#" cmd))
(set! cmd (re-sub "-dSAFER " "" cmd)))))
(status (system cmd)))
(if (not (= status 0))
(begin
(map delete-file
(append (dir-re "." png1) (dir-re "." pngn-re)))
(format (current-error-port)
(format #f (_ "~a exited with status: ~S") "GS" status))
(exit 1)))
(if (and rename-page-1? multi-page?)
(rename-file (re-sub "%d" "1" pngn) png1))
(append (dir-re "." png1) (dir-re "." pngn-re)))))
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