Epic Technic downloader thingy

technic.py

#!/usr/bin/env python

from argparse import ArgumentParser
from collections import namedtuple
import os
import requests
import yaml

TECHNIC_URL = 'https://github.com/TechnicPack/Technic/raw/master'

def main():
    p = ArgumentParser(
            description='Download the files that make up the Technic mod pack.',
            epilog='Kudos for reading the docs, Kuangda!'
            )
    p.add_argument('pack_name', metavar='PACK', type=str, default='tekkit',
            nargs='?', help='which mod pack to download (default: %(default)s)')
    p.add_argument('--pack-version', metavar='VERSION', type=str, default=None,
            nargs='?', help='which version to use (default: recommended build)')
    args = p.parse_args()

    # Download ALL the things
    print('Grabbing file list')
    for f in download_paths(args.pack_name, args.pack_version):
        print('Downloading %s' % f.url)
        with open(f.file_name, 'w') as out:
            out.write(requests.get(f.url).content)
    print('Ducks!')

class File(namedtuple('File', 'category name version extension')):
    @property
    def file_name(self):
        return '%s-%s.%s' % (self.name, self.version, self.extension)

    @property
    def url(self):
        # e.g. https://.../cheeseshop/cheeseshop-1.2.zip
        return os.path.join(TECHNIC_URL, self.category, self.name, self.file_name)

def download_paths(pack_name, version=None):
    r = requests.get(os.path.join(TECHNIC_URL, pack_name, 'modpack.yml'))
    meta = yaml.load(r.text)
    if version is None:
        version = meta['recommended']
    mods = extract_paths('mods', meta['builds'][version]['mods'], 'zip')
    libs = extract_paths('Libraries', meta['lib-1'], 'jar')
    return mods + libs

def extract_paths(category, manifest, extension):
    return [File(category, name, version, extension)
            for name, version in manifest.items()]

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print('\nCaught interrupt signal; quitting')