From: Joel VanderWerf <vjoel@...>
Date: 2002-02-07T06:05:44+09:00
Subject: combining Tk and irb as interfaces to app


Hi,

What's the best way to use both Tk and the irb command line as
interfaces to a ruby program?

I've considered these:

1. Run Tk.mainloop in a thread within irb (as in ruby-talk 18064). The
problem is that unless the thread has the same priority as the main irb
thread, one or the other starves. If they have the same priority, Tk
runs fine, and the irb command line works, but irb gets very slow even
if Tk is idle.

2. Run irb in a Tk window, sort of like the Turtle example (ruby-talk
15217). In that example, the GUI freezes when you execute a typed
command. I haven't tried using threads, but I would expect the same
problem as in 1. Another problem is that local vars don't persist in the
listener, and in general it is less friendly than irb.

3. Don't use threads, but instead call Tcl_DoOneEvent somewhere.

4. Fork and use druby to communicate between the Tk-based GUI and the
irb-based CLI.

Any suggestions?

If it helps, my app is an environment for interacting with the evolution
of a simulation. The user should be able to execute commands and scripts
from the command line, and also to use some Tk windows to inspect the
state of the simulation and also issue simple commands like 'run',
'stop'. etc.

--
Joel VanderWerf                          California PATH, UC Berkeley
mailto:vjoel@path.berkeley.edu                     Ph. (510) 231-9446
http://www.path.berkeley.edu                       FAX (510) 231-9512