import urllib.request as ur,re
import os,sys
thread = sys.argv[1]

url = ur.urlopen(thread)

str = url.read().decode('utf-8')
pathtosrc=re.sub('.html','',re.sub('https://2ch.hk/b/res/','/b/src/',thread))+"/\d+.webm"
pattern = re.compile('{}'.format(pathtosrc))
files = list(set(pattern.findall(str)))
directory = os.path.join(os.getcwd(), r'webm')
if not os.path.exists(directory):
   os.makedirs(directory)
for url in files:
    url='https://2ch.hk'+url
    path="webm/"+re.findall(r'\d+.webm',url)[0]
    ur.urlretrieve(url, path)
    print("Downloaded "+url+" to "+path)