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#!/bin/env python
#
# Helper script for maintainers to autogenerate resources for py-nltk
#
import hashlib
import sys
import urllib.request
import xml.etree.ElementTree
from typing import Optional

url = None  # type: Optional[str]
url = "https://raw.githubusercontent.com/nltk/nltk_data/gh-pages/index.xml"
if url is not None:
    document = urllib.request.urlopen(url).read()
    tree = xml.etree.ElementTree.fromstring(document)
    packages = tree.findall("./packages/package")
    for package in packages:
        url = package.get("url")
        name = package.get("id")
        subdir = package.get("subdir")
        if url is None:
            continue
        packagebody = urllib.request.urlopen(url).read()
        meta_checksum = package.get("checksum")
        loaded_checksum = hashlib.md5(packagebody).hexdigest()
        if meta_checksum == loaded_checksum:
            output_checksum = hashlib.sha256(packagebody).hexdigest()
            print(
                """
            resource(name='{0}',
            url='{1}',
            when='+data',
            sha256='{2}',
            destination='nltk_data/{3}',
            placement='{0}')""".format(
                    name, url, output_checksum, subdir
                )
            )
        else:
            print("""bad {0}""".format(url))
else:
    sys.exit(1)