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Add first draft of new osproc.readLines (#15429)

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* Add first draft of new osproc.readLines

* Add test for new osproc.readLines

* Rename test to start w/t to run; Also add newline to output

* Suppress hint messages.

* Output should match this time.

* Shoulda picked a program with simpler syntax than ..lol

* Address https://github.com/nim-lang/Nim/pull/15429#issuecomment-701890898
and https://github.com/nim-lang/Nim/pull/15429#issuecomment-701985976 by
factoring `readLines` into `iterator lines` and a wrapper `proc`.

* Address https://github.com/nim-lang/Nim/pull/15429#issuecomment-702127289
and also add a `ReadIOEffect` tag to the iterator (called by the wrapper..
so it should need no separate tag, if I understand correctly).
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c-blake 2020-10-01 12:06:38 -04:00 • committed by GitHub
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tests/osproc/treadlines.nim Normal file
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discard """
output: '''Error: cannot open 'a.nim'
Error: cannot open 'b.nim'
'''
targets: "c"
"""
import osproc
var ps: seq[Process] # compile & run 2 progs in parallel
for prog in ["a", "b"]:
ps.add startProcess("nim", "",
["r", "--hint[Conf]=off", "--hint[Processing]=off", prog],
options = {poUsePath, poDaemon, poStdErrToStdOut})
for p in ps:
let (lines, exCode) = p.readLines
if exCode != 0:
for line in lines: echo line
p.close