Polybar module for Google Play Music Desktop Player

README.md

I've been making an effort for a while to hit like on songs I like, mainly so I can always fail over to a playlist of liked songs. I generally use GPMDP as my main player and Polybar as my taskbar. I control my media player using playerctl and a while back I wrote songliker to set up a shortcut to like my songs. I decided to put it all together into a neat little polybar module and thought others might enjoy this.

I'm including the necessary files to do this yourself, although this might not work for you 'as-is' since I have a pretty customized systemd service management set up. Easiest way would be to just ignore the systemd stuff and just add an exec now_playing, but I'm including it here in case you want to use it and just modify that.

This will display the currently playing song in your bar in the following format {artist} - {song} | {liked?}. It uses Nerd Font symbols for a prefixing musical note and a thumbs up outline if not liked, or full if liked. It will also truncate the song name to fit the whole message into MAX_LEN characters.

It has the following inteactions:

• Left Click - Play/Pause
• Right Click - Next Song
• Double Click - Like Song

Here's what it looks like:

Requirements

• Set up polybar to use some type of Nerd Fonts, or include those symbols, or adjust the symbols to your liking
• Install playerctl
• Install any missing python dependencies (might just be websockets
• Run songliker once on the command line to register it against GPMDP. It'll prompt you for a code, but once you've set it up you won't have to worry about it again since the auth is saved.

config

// ~/.config/polybar/config
// only including relevant section
...
enable-ipc = true
...
[module/now_playing_gpmdp]
type = custom/ipc

hook-0 = echo ""
hook-1 = cat "${HOME}/.now_playing"

format = <output>
format-prefix = " "
format-prefix-foreground = ${colors.foreground}

click-left = playerctl --player=google-play-music-desktop-player play-pause
click-right = playerctl --player=google-play-music-desktop-player next
double-click-left = songliker

now_playing

#!/usr/bin/env python
# -*_ coding: utf-8 -*-
# ~/.local/bin/now_playing

import json
import signal
import subprocess
import sys
from pathlib import Path
from time import sleep

import websocket

# TODO: change these to args?
MAX_LEN = 60
MODULE_NAME = "now_playing"
NOW_PLAYING_FILE = Path("~/.now_playing").expanduser()

now_playing_data = {}


def handle_message(ws, message):
    global now_playing_data
    if any(
        '"channel":"{0}"'.format(channel) in message for channel in ["track", "rating"]
    ):
        msg = json.loads(message)

        now_playing_data.update(msg["payload"])

        # track messages always come in first, update once we get rating message
        if now_playing_data["title"] and msg["channel"] == "rating":
            send_curr_song()


def truncate_title_if_needed():
    # 7 hardcoded chars
    str_len = 7 + sum(
        len(v) for k, v in now_playing_data.items() if k in ["artist", "title"]
    )

    if str_len > MAX_LEN:
        # 3 chars for ellipsis
        to_remove = MAX_LEN - str_len - 3
        now_playing_data["title"] = now_playing_data["title"][:to_remove] + "..."


def send_curr_song():
    now_playing_data["liked"] = "" if now_playing_data["liked"] else ""

    truncate_title_if_needed()
    msg = "{artist} - {title} | {liked}".format(**now_playing_data)
    NOW_PLAYING_FILE.write_text(msg)
    send_polybar(2)


def clear_song():
    send_polybar(1)


def send_polybar(hook):
    subprocess.call(["polybar-msg", "hook", MODULE_NAME, str(hook)])


def signal_handler(sig, frame):
    clear_song()
    sys.exit(0)


def main():
    while True:
        signal.signal(signal.SIGTERM, signal_handler)
        ws = websocket.WebSocketApp("ws://localhost:5672", on_message=handle_message)
        ws.run_forever()
        clear_song()
        sleep(5)


if __name__ == "__main__":
    main()

now_playing.service

# ~/.local/share/systemd/user/now_playing.service
[Unit]
Description=watch for song changes and tell polybar
After=polybar.service
PartOf=polybar.service

[Service]
ExecStart=/bin/bash -c now_playing

[Install]
WantedBy=i3.target

songliker

#!/usr/bin/env python
# -*_ coding: utf-8 -*-

import json
from pathlib import Path
from subprocess import call

import websocket

config_location = Path("~/.config/gpmdp_api").expanduser()


def like_song(ws):
    thumbs_up = {"namespace": "rating", "method": "setRating", "arguments": [5]}

    ws.send(json.dumps(thumbs_up))
    try:
        call(["notify-send", "Liked song on GPMDP"])
    except FileNotFoundError:
        call(["terminal-notifier", "-message", "Liked song on GPMDP"])


def get_saved_code():
    if config_location.exists():
        return config_location.read_text()


def save_code(code):
    with open(config_location, "w") as conf:
        conf.write(code)


def get_code(ws):
    code = get_saved_code()

    if not code:
        code = authenticate(ws)
    return code


def authenticate(ws):
    connect(ws)
    code = input("Please input code: ")
    res = connect(ws, code)
    save_code(res)
    return res


def connect(ws, code=None):
    connect = {"namespace": "connect", "method": "connect", "arguments": ["Song Liker"]}

    if code is not None:
        connect["arguments"].append(str(code))

    ws.send(json.dumps(connect))

    # we only get a response while authenticating
    if code is None or len(code) == 4:
        return get_response(ws, "connect")["payload"]


def get_response(ws, channel):
    for res in ws:
        if '"channel":"{0}"'.format(channel) in res:
            return json.loads(res)


def main():
    ws = websocket.create_connection("ws://localhost:5672")
    code = get_code(ws)
    connect(ws, code)
    like_song(ws)
    ws.close()


if __name__ == "__main__":
    main()

Added signal handler to clear song on exit (using SIGTERM which is the systemd default... not sure if this is the best overall signal tho)

Seems like the function save_code is missing from songliker.

@calops yep, you're right! I had updated this in my dotfiles (https://github.com/aiguofer/dotfiles/blob/master/user/.local/bin/songliker) but forgot this gist was out there haha. I've updated it with the latest.