From help-octave-request at bevo dot che dot wisc dot edu  Sun Jan 30 19:41:37 2000
Subject: Re: perlTK
From: Joao Cardoso <jcardoso at inescn dot pt>
To: "help-octave at bevo dot che dot wisc dot edu" <help-octave@bevo.che.wisc.edu>
Date: Mon, 31 Jan 2000 01:42:22 +0000

"John W. Eaton" wrote:
> 
> On 21-Jan-2000, Daniel Heiserer <Daniel dot Heiserer at bmw dot de> wrote:
> 
> | My question for a fast-hack-gui:
> |
> | can I launch a perl script via "system" or
> | something else, redirect the
> | input of octave to a pipe which is fed
> | by perlTK of the perlscript?
> | Can I exit the perlscript, or
> | "pause" it somehow, in the way that octave
> | goes back to the STDIN, and
> | when my terminal hacking is
> | finished I redirect to my
> | perlTK gui?
> 
> If what you are asking is how to make Octave continue to accept input
> at the command-line prompt and also process GUI events, I think the
> answer is to register an event hook function with readline.

Couldn't Octave have a function to do it? Something like

   on_idle("user function","user data")

Then Octave could have a general wrap function, registered with
readline, that would call the user function (be it a script file or dll
function). Something like (in C, of course):

function on_idle_wrapper
   if ( ! exist(user_idle_function))
      return
   endif
   feval("user_function","user data")
endfunction

on_idle_wrapper would always be registered by Octave with readline.

Also, on_idle_wrapper could be called by octave itself whenever, say,
the parser finish parsing a line (I need help on this). This would
provide some iterativity while octave runs a script.

This would provide an uniform interface for whatever the user wants.
Any suggestions or comments? I could try to implement it.

I have already implemented a working (but not recommendable)

   on_signal(signal_number, user_function, user_data)

that intercepts unix signals and executes an user function on its
occurence.
 
Joao



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