import os
import subprocess


def get_pr_files():
    PR_LIST_FILE = 'pr_list'
    DIFF_INFO_FILE = 'diff_info'
    res = []
    if os.path.exists(PR_LIST_FILE):
        with open(PR_LIST_FILE, 'r') as f:
            for line in f.readlines():
                res.append(line.split('\n')[0])
    else:
        subprocess.call('git show --stat > {}'.format(DIFF_INFO_FILE), shell=True)
        with open(DIFF_INFO_FILE, 'r') as f:
            diff_ctt = f.read()
        slices = diff_ctt.split('\n\n')[2]
        for slice in slices.split('\n'):
            if '|' in slice:
                if '=>' not in slice.split('|')[0].strip():
                    res.append(slice.split('|')[0].strip())
        with open(PR_LIST_FILE, 'w') as f:
            for i in res:
                f.write(i + '\n')
    return res