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(define-module (util io)
:use-module ((ice-9 rdelim) :select (read-line)))
(define-public (open-input-port str)
(if (string=? "-" str)
(current-input-port)
(open-input-file str)))
(define-public (open-output-port str)
(if (string=? "-" str)
(current-output-port)
(open-output-file str)))
(define-public (read-lines port)
(with-input-from-port port
(lambda ()
(let loop ((line (read-line)))
(if (eof-object? line)
'() (cons line (loop (read-line))))))))
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