From: Guillaume Marcais <guslist@...>
Date: 2004-04-24T04:37:54+09:00
Subject: Re: Talking with processes

Does your lib work on Windows? Could it work with win32_popen?

Guillaume.

On Fri, 2004-04-23 at 11:24, Ara.T.Howard wrote:
> On 23 Apr 2004, Dario Linsky wrote:
> 
> > Hi,
> > 
> > I am trying to open an external process that normally reads and writes from 
> > stdin/to stdout. For opening a pipe to this process I am using IO.popen.
> > 
> > Reading each line from the pipe is no problem until it comes to a point where 
> > the external process wants to get some data from stdin and it waits for input.
> > 
> > Now when I write something into the IO stream I need to call IO#close_write for 
> > further reading. But since the pipe is closed now, I cannot write to it any 
> > more.
> > 
> > For example:
> > -- snip --
> > pipe = IO.popen("ruby -r debug script.rb", "w+")
> > if pipe
> >   while line = pipe.gets
> >     line.chomp!
> >     puts line
> >     if line =~ /^script\.rb:\d+\:.+$/ # Regexp to find special lines
> >       # Here I want to tell the debugger what to do and
> >       # get further output to evaluate.
> >       pipe.puts "next"
> >       pipe.close_write
> >   end
> > end
> > -- snap --
> > 
> > Is there any way to reopen the pipe at the position where I close it or is there
> > any way to avoid using IO#close_write so I can write more commands to the 
> > debugger?
> > 
> > Greetings, Dario
> > 
> 
> 
> try this:
> 
>   http://raa.ruby-lang.org/list.rhtml?name=session
> 
> it will do that, and more.  what you describe is EXACTLY why i wrote this,
> when you need to send muliple commands to an external process and de-multiplex
> the responses (output).  you also get stderr.
> 
> -a
> -- 
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>