Watch jupyter notebook changes and LiveReload slides

watch.py

#!/usr/bin/env python

import sys
import os
import time
import logging
import argparse
import subprocess
import threading
import webbrowser
from livereload import Server

logger = logging.getLogger(__name__)


def update(filename):
    command = ['jupyter-nbconvert', '--to', 'slides', filename]
    logger.warning("Execute %s", " ".join(command))
    subprocess.check_call(command)


if __name__ == "__main__":
    logger.setLevel(logging.INFO)
    parser = argparse.ArgumentParser(description="""
        Watch jupyter notebook changes and nbconvert to reveal.js slides
        Serve generated html with web server and LiveReload enabled (browser extension required)
    """)
    parser.add_argument("ipynb", type=str, help="jupyter notebook file")
    args = parser.parse_args()
    path = args.ipynb
    assert os.path.isfile(path), "Can not open file '%s'" % path

    update(path)
    logger.info("Watching file %s", path)
    server = Server()
    server.watch(path, lambda: update(path))

    def opener():
        time.sleep(1)
        base, _ = os.path.splitext(os.path.basename(path))
        webbrowser.open('http://localhost:5500/%s.slides.html' % base)
    threading.Thread(target=opener).start()

    server.serve(root=os.path.dirname(path), liveport=35729)