(MPD/Mopidy) Adds tracks to the playlist newly added to the library

mpd-diff.py

#!/usr/bin/python

import os;
import pickle;
from subprocess import check_output;
from subprocess import Popen;
from mpd import MPDClient;

run_dir = os.environ.get("XDG_RUNTIME_DIR");

client = MPDClient();
client.timeout = 10;
client.idletimeout = None;
client.connect("localhost", 6600);

try:
	cache_file = open(run_dir + "/mpd_cache.pickle", 'rb');
	old = pickle.load(cache_file);
except:
	cache_file = None;
	old = [];

new = check_output(["mpc", "ls", "Local media/Tracks"]).decode("utf-8").strip().split("\n");

if not cache_file:
	final = set(new);
else:
	final = set(new) - set(old);

try:
	if cache_file:
		cache_file.close();
	cache_file = open(run_dir + "/mpd_cache.pickle", 'wb');

	pickle.dump(new, cache_file);
except:
	print("Couldn't write cache pickle");
	pass;

client.command_list_ok_begin();

for item in final:
	print("Adding {} to the current playlist...".format(item));
	client.add(item);

results = client.command_list_end();