#!/usr/bin/env python3
import os
import re
import argparse


def natural_key(string_):
    return [int(s) if s.isdigit() else s for s in re.split(r'(\d+)', string_)]


def abs_path(path):
    abs_path = os.path.abspath(path)
    return abs_path

def parser():
    parser = argparse.ArgumentParser()
    parser.add_argument('--steps', type=int,
                    help='Number of steps to run the simulation')
    parser.add_argument('--jobs_path', type=str, nargs='+', action='append',
                    help='Jobs path containing the jobs to be run')
    parser.add_argument('--namd_params', type=str,
                    help='Optional parameters to send to namd')
    parser.add_argument('--ffs_path', type=str,
                    help='Location of the forcefield files')
    parser.add_argument('--namd2_bin', type=str,
                    help='Location of the namd2 executable')
    args = parser.parse_args()
    return args