Updating MathJax CDN

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MathJax is shutting down its CDN, as officially announced on the MathJax website and on StackExchange\'s Meta. The official announcement recommends several alternatives, inc

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情话喂你

2021-01-14 15:27

Here's the first approach I whipped up in Python; not sure how safe or inclusive it is. I first write a function called update_mathjax. This uses BeautifulSoup to find the <head>, and then searches for a <script> whose src attribute points to the MathJax CDN. If it finds it, it replaces src with an updated src and rewrites the file.

from bs4 import BeautifulSoup as bs
old_cdn = 'https://cdn.mathjax.org/mathjax/latest/MathJax.js'
new_cdn = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js'
def update_mathjax(filename):
    with open(filename, 'r+') as file_handle:
        file_contents = file_handle.read()
        soup = bs(file_contents, "html5lib")
        scripts = soup.find('head').find_all('script')
        for script in scripts:
            if script.attrs and 'src' in script.attrs:
                if script.attrs['src'][:49] == old_cdn:
                        q = script.attrs['src'][49:]
                        new_src = new_cdn + q
                        script.attrs['src'] = new_src
                        file_handle.seek(0)
                        file_handle.write(soup.prettify())
                        file_handle.truncate()
                        print('udated ' + filename)

With that, it's reasonably easy to traverse the directory tree and apply the function.

import os
for directory_name, subdirectory_list, filename_list in os.walk(os.getcwd()):
    for filename in filename_list:
        if filename[-5:] == ".html":
            update_mathjax(os.path.join(directory_name, filename))

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