#!/usr/bin/env python3
# No dependencies needed.
# G.Berthiaume 2019
import pathlib
import subprocess
import shlex
from typing import Tuple # mypy

def execute_command(cmd: str, cwd: pathlib.Path = pathlib.Path(".")) -> Tuple[str, str]:
    """ Execute a child program in a new process and pipe the output out.
    Args:
        cmd: The command to execute. eg. `git status`
        cwd: Where to start the child program. The default is in the same directory
             as this python script.

    Returns:
        A tuple of two strings: The standard output and the standard error
        of the child program.
        If there's no stdout, stdout will be an empty string.
        If there's no stderr, stderr will be an empty string.
    """
    PIPE = subprocess.PIPE
    process = subprocess.Popen(
        shlex.split(cmd), stdout=PIPE, stderr=PIPE, cwd=str(cwd.resolve())
    )
    stdout_raw, stderr_raw = process.communicate()
    stdout, stderr = stdout_raw.decode("utf-8"), stderr_raw.decode("utf-8")
    return stdout, stderr