# -*- coding: utf-8 -*-
import subprocess
import os
from itertools import chain


def system(cmd):
    '''
    @summary: excute a subprocess return util subprocess stopped
    @param cmd: a string that need to excute in subprocess
    @result: return_code, stdout, stderr
    '''
    process = subprocess.Popen(
        args=cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
    std_out, std_err = process.communicate()
    return_code = process.poll()
    return return_code, std_out, std_err


def mkdirs(dirname):
    if not os.path.exists(dirname):
        os.makedirs(dirname)


def get_all_file(dirname):
    result = [os.path.join(dp, f) for dp, dn,
              filenames in os.walk(dirname) for f in filenames]
    return result


def filter_files(files, filter_names):
    ret = []
    for filename in files:
        try:
            if filename.split(".")[-1] in filter_names:
                ret.append(filename)
        except:
            pass
    return ret


def write_error_to_file(file):
    with open(file, 'w+') as f:
        f.write("0")