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All things lisp: cl, scheme, racket, clojure etc34 Servers

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@mrtn:hackeruniverse.dkMrtn DkIn Guile scheme, which command do you recommend for reading a line of text (from a file stored on a fixed disk, for instance)?11:24:12
@hideyo:matrix.orghideyo(read-line) from (ice-9 rdelim) module11:25:05
@hideyo:matrix.orghideyo * (read-line) from (ice-9 rdelim) module11:26:11
5 Jul 2020
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@mrtn:hackeruniverse.dkMrtn Dk
In reply to @hideyo:matrix.org
(read-line)
from (ice-9 rdelim) module
Thank you! That works great!
12:58:01
@mrtn:hackeruniverse.dkMrtn DkI have a small problem though, albeit I worked around the problem for now. The problem is, I get a #\return at the end of each line I read, if the file happens to be stored in "DOS" format.12:59:02
@mrtn:hackeruniverse.dkMrtn DkI tried (read-line <port> 'split), but it only splits the newline from the payload. 13:00:18
@mrtn:hackeruniverse.dkMrtn DkA workaround is of cause very simple, for instance (let* ((lin (read-line port)) (len (string-length lin))) (set! lin (string-filter (lambda (c) (not (char=? c #\return)))) ;; or similar.13:03:39
@mrtn:hackeruniverse.dkMrtn Dk(sorry for all the errors, but you get the point, I hope).13:05:50
@mrtn:hackeruniverse.dkMrtn Dk (string-filter (λ (c) (not (char=? c #\return))) (car (read-line (open-file "filename" "r") 'split)))13:06:52
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@hideyo:matrix.orghideyo
In reply to @mrtn:hackeruniverse.dk
I have a small problem though, albeit I worked around the problem for now. The problem is, I get a #\return at the end of each line I read, if the file happens to be stored in "DOS" format.
interesting. (read-line) is sort of standard for scheme, so we should maybe check how other implementation handle this (if #\return is omitted or not) and if it's different, maybe submit a bug report
18:08:52
@mrtn:hackeruniverse.dkMrtn Dkhideyo: Can you reproduce the error on your system?19:51:51
@mrtn:hackeruniverse.dkMrtn Dk hideyo: 19:52:06
@hideyo:matrix.orghideyo
In reply to @mrtn:hackeruniverse.dk
hideyo: Can you reproduce the error on your system?
yes, and I tried it in guile, chez scheme (get-line) and racket. It works the same in every implementation, so this is not an error
22:20:36
6 Jul 2020
@mrtn:hackeruniverse.dkMrtn Dk
In reply to @hideyo:matrix.org
yes, and I tried it in guile, chez scheme (get-line) and racket. It works the same in every implementation, so this is not an error
How do you mean it is not an error? As in, you got a different result, or as in the last character of the string is supposed to be a #\return if reading a DOS-file ?
02:07:12
@hideyo:matrix.orghideyo

<@hideyo:matrix.org> yes, and I tried it in guile, chez scheme (get-line) and racket. It works the same in every implementation, so this is not an error

How do you mean it is not an error? As in, you got a different result, or as in the last character of the string is supposed to be a #\return if reading a DOS-file ?

I got same result so \return is supposed to be the last character

06:39:30
@mrtn:hackeruniverse.dkMrtn Dk
In reply to @hideyo:matrix.org

<@hideyo:matrix.org> yes, and I tried it in guile, chez scheme (get-line) and racket. It works the same in every implementation, so this is not an error

How do you mean it is not an error? As in, you got a different result, or as in the last character of the string is supposed to be a #\return if reading a DOS-file ?

I got same result so \return is supposed to be the last character

😎👍
06:51:35

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