From: Urabe Shyouhei <shyouhei@...>
Date: 2010-03-10T06:31:32+09:00
Subject: Re: Capturing incremental output from STDOUT

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James Coglan wrote:
> Hi all,
>=20
> If I run an external process, e.g.
>=20
> IO.popen('cucumber')
>=20
> Then Ruby blocks while waiting for the whole output of the subprocess.

really?

irb(main):001:0> IO.popen("yes yes") do |fp|
irb(main):002:1*     loop do
irb(main):003:2*         puts Time.now
irb(main):004:2>         fp.gets
irb(main):005:2>         sleep 1
irb(main):006:2>     end
irb(main):007:1> end
Wed Mar 10 06:30:25 +0900 2010
Wed Mar 10 06:30:26 +0900 2010
Wed Mar 10 06:30:27 +0900 2010
Wed Mar 10 06:30:28 +0900 2010
Wed Mar 10 06:30:29 +0900 2010
Wed Mar 10 06:30:30 +0900 2010
=2E..

Seems it do not wait the EOF.


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