add: command execution facilities

# -*- coding: utf-8 -*-

import os, sys, subprocess

from threading import Lock

def enum(*sequential, **named):

            if self._parent._readers == 0:

                self._parent._writemutex.release()

            self._parent._mutex.release()

class Exec(object):

    '''

    '''

    @staticmethod

    def call(cmd, shell=False, input=None, capture_output=True,

                                                            merge_output=True):

        '''

        '''

        stdout, stderr = None, None

        if capture_output:

            stdout = subprocess.PIPE

            if merge_output:

                stderr = subprocess.STDOUT

            else:

                stderr = subprocess.PIPE

        else:

            stdout = open(os.devnull, 'w')

            stderr = stdout

        print 'DBG>>> ' + ' '.join(cmd)

        proc = subprocess.Popen(cmd, shell=shell, stdout=stdout, stderr=stderr)

        if input is None:

            output = proc.communicate()

        else:

            output = proc.communicate(input=input)

        return (proc.returncode, output)

    @staticmethod

    def silent(cmd, shell=False):

        '''

        '''

        return Exec.call(cmd, shell=shell, capture_output=False)[0]