From: Rob Pierry <rpierry+ruby@...>
Date: 2007-10-06T01:17:12+09:00
Subject: Re: Force IRB into interactive mode (to display prompt)?

Rob Pierry wrote:
> I'm implementing a front end for irb that involves running it in a
> background process.  I have it working such that I can collect input
> from my program and write it to the redirected stdin of irb and then
> read the output from redirected stdout, but it looks like when irb
> detects that it isn't running in interactive mode it doesn't print a
> prompt for some reason.
> 
> I've tried setting conf.verbose = true, but that doesn't work.  If I
> don't redirect stdin, the prompt appears just fine.  How can I force irb
> to display the prompt, even if stdin is redirected?
> 
> I'm using 1.8.5 on windows xp.

May have solved my own problem.

It looks like passing:
--readline --prompt default

to irb makes things work.  When I start irb normally, I end up with 
readline for input and the prompt.  When my app was starting the 
process, I ended up with the stdio input and no prompt.

Thanks for all the replies.
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