""" This file demonstrates use of subprocess.

1. If shell=True, shell will execute /bin/sh, so you can pass
in the args with the program first, then any params.
Replace the shellcmd string with an executable path/bash script parameters.

2. If shell=False, it is suggested to the keyword
executable='<program'. The args can be a list, and just
slice with [:].
"""
import subprocess


def runsub_noshell(prg, args):
    ex = prg
    arg = args
    commstr = 'This is input into communicate'
    p = subprocess.Popen(args=arg[:],
                         executable=ex,
                         bufsize=4096,
                         stdin=subprocess.PIPE,
                         stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE,
                         close_fds=False,
                         shell=False)

    return p.communicate()


def runsubshell(args):
    arg = args
    p = subprocess.Popen(args=arg[:],
                         bufsize=4096,
                         stdin=subprocess.PIPE,
                         stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE,
                         close_fds=False,
                         shell=True)


    return p.communicate()


# programs and params
shellcmd = '/home/patrick/devjy --version'
noshellcmd = ['find', '.', '-iname', '*.py']
prg = 'find'

noshell = runsub_noshell(prg, noshellcmd)
withshell = runsubshell(shellcmd)

print 'Result from process with no shell: ',
for x in noshell:
    print x
print 'Result from process with shell: '
for x in withshell:
    print x