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(define-module (copirate modules copirate-site)
  #:use-module (guix gexp)
  #:use-module (guix modules)
  #:use-module (gnu packages audio)
  #:use-module (gnu packages music)
  #:use-module (gnu packages imagemagick)
  #:export
  (
   build-copirate-site
   ))

(define (build-copirate-site source)
  (computed-file
   "copirate-site"
   (with-imported-modules
    (source-module-closure '((guix build utils)))
    #~(begin
        (use-modules (guix build utils) (ice-9 ftw))
        (mkdir-p #$output)
        (copy-recursively #$source #$output)
        (with-directory-excursion
         #$output
         (let ((enter? (lambda (name stat result) #t))
               (leaf (lambda (name stat result)
                       (when (string-suffix? ".ly" name)
                         (invoke #$(file-append lilypond "/bin/lilypond") name))))
               (down (lambda (name stat result) #t))
               (up (lambda (name stat result) #t))
               (skip (lambda (name stat result) #t))
               (error (lambda (name stat errno result) #t)))
           (file-system-fold enter? leaf down up skip error #t "."))
         (let ((enter? (lambda (name stat result) #t))
               (leaf (lambda (name stat result)
                       (when (string-suffix? ".pdf" name)
                         (let ((miniature-name
                                (string-append
                                 (substring name 0 (- (string-length name) (string-length ".pdf")))
                                 "-miniature.png")))
                           (invoke #$(file-append imagemagick "/bin/convert")
                                   "-resize" "210x297" "+append"
                                   (string-append name "[0-4]")
                                   miniature-name)))))
               (down (lambda (name stat result) #t))
               (up (lambda (name stat result) #t))
               (skip (lambda (name stat result) #t))
               (error (lambda (name stat errno result) #t)))
           (file-system-fold enter? leaf down up skip error #t "."))
       (let ((enter? (lambda (name stat result) #t))
             (leaf (lambda (name stat result)
                     (when (string-prefix? "./" name)
                       (set! name (substring name (string-length "./"))))
                     (when (string-suffix? ".midi" name)
                       (format (current-error-port) "Midi file: ~s…\n" name)
                       (invoke #$(file-append timidity++ "/bin/timidity")
                               "-Ov" name))))
             (down (lambda (name stat result) #t))
             (up (lambda (name stat result) #t))
             (skip (lambda (name stat result) #t))
             (error (lambda (name stat errno result) #t)))
         (file-system-fold enter? leaf down up skip error #t ".")))))))