From: Robert Klemme <bob.news@...>
Date: 2004-07-13T17:27:26+09:00
Subject: Re: Fork style of little programs


"Markus Liebelt" <markus.liebelt@online.de> schrieb im Newsbeitrag
news:ufz7wdibt.fsf@online.de...
> Hello everybody,
>
> I would like to build some small ruby programs, that will work
> together as the unix shell commands. Eg the following could be used
> inside a Cygwin shell:
>
> $ ruby evallog.rb | ruby sum.rb "Log: (.*)"
>
> which will evaluate a logfile, dump the result in lines, and the
> second program will sum up the entries beginning with "Log: ". Just
> to give you a sample how to do it.
>
> I now try to combine the two little programs in one program without
> redefining the way their methods work. The first just writes out its
> result by "puts ...", the second uses the variable $stdin. But how
> could a new method look that combines the two? I have no idea how to
> write it down. Is there something to "fork" the first one, so that
> the second one can read from standard input while the first writes to
> standard output?

You could use a Queue (or an in process pipe implementation, if there is
such a thing in ruby) and two threads within the same process.

Regards

    robert