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(use-modules (guix gexp)
(guix modules)
(gnu packages music)
(gnu packages imagemagick))
(computed-file
"copirate-site"
(with-imported-modules
(source-module-closure '((guix build utils)))
#~(begin
(use-modules (guix build utils) (ice-9 ftw))
(mkdir-p #$output)
(copy-recursively
#$(local-file "." "copirate-site-source"
#:recursive? #t
#:select?
(lambda (file stat)
(or (string-suffix? "/index.html" file)
(string-suffix? "/index.css" file)
(string-suffix? ".ly" file))))
#$output)
(with-directory-excursion
#$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 "."))))))
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