[quick hack] Get artists and names from a list of spotify track urls

spotify-url2info.py

#!/usr/bin/env python3

"""
Takes a file full of Spotify track URLss and prints their artists and track
names to stdout. Useful for converting a spotify playlist export to a list of
human-readable songs.

File format:
```
https://open.spotify.com/track/<track id>
[...]
https://open.spotify.com/track/<track id>
```
"""

import json
import sys
import urllib.request


def get_html(url):
    with urllib.request.urlopen(url) as r:
        return r.read().decode("utf-8")


def parse_html(html):
    for line in html.splitlines():
        s = line.split("Spotify.Entity = ")
        if len(s) == 2:
            s = s[-1]
            break
    else:
        return None

    d = json.loads(s.rstrip(";"))
    name = d["name"]
    artists = ", ".join(x["name"] for x in d["artists"])
    return "{1} - {0}".format(name, artists)


def main():
    if len(sys.argv) < 2:
        print("Syntax: {} <input file>".format(sys.argv[0]))
        return

    with open(sys.argv[1], "r") as f:
        for line in f:
            html = get_html(line)
            info = parse_html(html)
            if info is None:
                print ("ERROR: Couldn't find song data for url {}".format(line))
            else:
                print(info)

if __name__ == "__main__":
    main()