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Code Issues 1 Releases Wiki Activity

Add file/lines iterator

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This commit is contained in:
Ico Doornekamp 2023-05-24 16:39:49 +02:00
parent 909c906080
commit 64e3cdeb2b
2 changed files with 26 additions and 0 deletions
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13
src/boot/boot.janet
View File

@ -1749,6 +1749,19 @@
(printf (dyn *pretty-format* "%q") x)
(flush))
(defn file/lines
"Return an iterator over the lines of a file"
[file-or-path &opt mode]
(default mode :r)
(if (bytes? file-or-path)
(coro
(with [f (file/open file-or-path mode)]
(while (def line (file/read f :line))
(yield line))))
(coro
(while (def line (file/read file-or-path :line))
(yield line)))))
###
###
### Pattern Matching

13
test/suite0009.janet
View File

@ -102,6 +102,19 @@
(os/execute [janet "-e" `(repeat 20 (print :hello))`] :p {:out f})
(file/flush f)))
# each-line iterator
(assert-no-error "file/lines iterator"
(def outstream (os/open "unique.txt" :wct))
(def buf1 "123\n456\n")
(defer (:close outstream)
(:write outstream buf1))
(var buf2 "")
(each line (file/lines "unique.txt")
(set buf2 (string buf2 line)))
(assert (= buf1 buf2) "file/lines iterator")
(os/rm "unique.txt"))
# Issue #593
(assert-no-error "file writing 3"
(def outfile (file/open "unique.txt" :w))