() l...@gnu.org (Ludovic Courtès) () Sat, 11 Feb 2017 15:12:00 +0100 > (define (file->lines filename) > "Returns a list of lines contained in a file" > (call-with-input-file > filename > (lambda (p) > (let loop ([line (read-line p)]) > (if (eof-object? line) (list) > (cons > (substring line 0 (1- (string-length line))) > (loop (read-line p))))))))
UTF-8 I/O is usually faster in Guile 2.0. You might want to
make sure your file is opened as UTF-8:
(with-fluids ((%default-port-encoding "UTF-8"))
(call-with-input-file file …))
FWIW, we can also use SRFI 13 to save a few cycles:
(use-modules (ice-9 rdelim) (srfi srfi-13))
(define (file->lines filename)
"Return a list of lines contained in a file."
(call-with-input-file
filename
(lambda (p)
(let loop ((acc '()))
(let ((line (read-line p)))
(if (eof-object? line)
(reverse! acc) ; rv
(loop (cons (string-drop-right line 1)
acc))))))))
This variant is also more stack-conserving (amenable to TCO),
which should afford some additional speedup.
--
Thien-Thi Nguyen -----------------------------------------------
(defun responsep (query)
(pcase (context query)
(`(technical ,ml) (correctp ml))
...)) 748E A0E8 1CB8 A748 9BFA
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