[PD] communicating with the shell

Andy Farnell padawan12 at obiwannabe.co.uk
Wed Jan 28 21:49:31 CET 2009

Both Lua and Python are great suggestions. But avoid the issue
of fixing [shell]. It has been problematic for a long time and
this is another opportunity to discover how to fix it, or
deprecate/remove it altogether.

I think there's something to be said for all Pd distros  _not_ 
including [shell] for obvious reasons. If users want to open 
that door it should be an informed decision. That would happen
if they could only use PyExt and PdLua. [shell] is very buggy,
has it's day finally come to be fixed or dropped?

On Wed, 28 Jan 2009 14:50:32 -0500
patrick <puredata at 11h11.com> wrote:

> another solution is with pyext.
> in pdmtl abstractions it's under linux.process.pd (but i think it should 
> work on windows and mac (not tested)).
> import sys, os, time, signal, subprocess
> try:
>     import pyext
> except:
>     print "ERROR: This script must be loaded by the PD pyext external"
>     sys.exit()
> class sub(pyext._class):
>     """A simple script to start and stop process"""
>     # number of inlets and outlets
>     _inlets=1
>     _outlets=1
>     def __init__(self,*args):
>         pass
>     def start_1(self,a):
>         global process
>         process = subprocess.Popen(str(a))
>         self._outlet(1, 'opening '+str(a))
>     def stop_1(self,*a):
>         os.kill(process.pid, signal.SIGTERM)
>         self._outlet(1, 'stopping process '+str(process.pid))
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Use the source

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