auto_update.py

import requests, urllib.request, shutil, os
from pprint import pprint
import winreg
from pathlib import Path
from subprocess import Popen

def check_registry_for_spel2():
    if winreg is None:
        return None

    programs = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, 'Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall')

    index = 0
    while True:
        try:
            keyname = winreg.EnumKey(programs, index)
            index += 1
        except OSError:
            return None

        try:
            subkey = winreg.OpenKey(programs, keyname)
            name, _ = winreg.QueryValueEx(subkey, "DisplayName")
            if name == "Spelunky 2":
                return Path(winreg.QueryValueEx(subkey, "InstallLocation")[0])
        except OSError:
            continue

    return None

r = requests.get('https://api.github.com/repos/spelunky-fyi/overlunky/releases')

for data in r.json():
    if data['tag_name'].lower() == 'whip':
        url = data['assets'][0]['browser_download_url']
        print('Getting WHIP build and information about it...')
        urllib.request.urlretrieve(url, 'Overlunky_WHIP.zip')
        print('Extracting zip...')
        s2_path = check_registry_for_spel2()
        if s2_path is not None:
            shutil.unpack_archive('Overlunky_WHIP.zip', s2_path)
        elif Path('C:/Program Files (x86)/Steam/steamapps/common/Spelunky 2/Spel2.exe').exists():
            s2_path = 'C:/Program Files (x86)/Steam/steamapps/common/Spelunky 2'
            shutil.unpack_archive('Overlunky_WHIP.zip', s2_path)
        else:
            shutil.unpack_archive('Overlunky_WHIP.zip', '.')
            
        os.remove('Overlunky_WHIP.zip')
        if s2_path is not None:
            print('Successfully downloaded WHIP build to \'{}\'.'.format(s2_path))
        elif Path('C:/Program Files (x86)/Steam/steamapps/common/Spelunky 2/Spel2.exe').exists():
            s2_path = Path('C:/Program Files (x86)/Steam/steamapps/common/Spelunky 2/')
            print('Downloaded WHIP build to \'{}\' since this program could not find your Spelunky folder installation.'.format(s2_path))
        else:
            print('Downloaded WHIP build to current folder.')
        Popen([s2_path / 'Overlunky/Overlunky.exe'])