I'm trying to grab 5 lines by their line numbers from a large (> 1GB) file
with Clojure.
So far I've got:
(defn multi-nth [values indices]
(map (partial nth values) indices))
(defn read-lines [file indices]
(with-open [rdr (clojure.java.io/reader file)]
(let [lines (line-seq rdr)]
(multi-nth lines indices))))
Now, (read-lines "my-file" [0]) works without a problem. However, passing
in [0 1] gives me the following error: "java.lang.RuntimeException:
java.io.IOException: Stream closed"
It seems that the stream is being closed before I can read the second line
from the file. Interestingly, if I manually pull out a line from the file
with something like `(nth lines 200)`, the `multi-nth` call works for all
values <= 200.
Any idea what's going on?
PS This question is on SO if someone wants
points:
http://stackoverflow.com/questions/11995807/lazily-extract-lines-from-large-file
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