Stuff JS and CSS into an HTML file

html_resource_stuffer.py

"""Fetch JS & CSS referenced from the web, and stuff it into the HTML."""

import lxml.html
import requests

IN_FILE = "Using Nbconvert.slides.html"
OUT_FILE = "Using Nbconvert.slides.stuffed.html"

document = lxml.html.parse(IN_FILE)

# Stuff <script> tags
for node in document.findall(".//script[@src]"):
    if node.text:
        raise ValueError("Node <script src=%r> has both src and text. Can't stuff!")
    src = node.attrib['src']
    print("Stuffing JS:", src)
    r = requests.get(src)
    r.raise_for_status()
    del node.attrib['src']
    node.text = r.text

for node in document.findall(".//link[@rel='stylesheet']"):
    if node.text:
        raise ValueError("<link> element had unexpected text")
    href = node.attrib['href']
    if not href.startswith(('http://', 'https://', '//')):
        print("Skipping local CSS URL:", href)
        continue
    print("Stuffing CSS:", href)
    r = requests.get(href)
    r.raise_for_status()
    node.clear()
    node.tag = 'style'
    node.text = r.text

document.write(OUT_FILE, encoding='utf-8', method='html', pretty_print=True)