Adds the currently playing iTunes/Spotify track to your prepared git commit message.

git-music.sh

#!/bin/bash
# Adds the currently playing iTunes track to your prepared commit message.
#
# To install, save in repo as chmod +x to .git/hooks/prepare-commit-msg
# save music.js somewhere like ~/.bin
# if you don't use a commit template $SONG should precede $1 to allow --verbose 
# commits to work, otherwise change the echo to "$(cat $1)\n\n$SONG"
SONG=`osascript -l JavaScript ~/.bin/music.js`
if [[ $SONG ]]; then
    echo -e "\n\n$SONG\n$(cat $1)" > $1
fi

music.js

#!/usr/bin/env osascript -l JavaScript

var trackForPlayer = (appName) => {
  if (Application(appName).running()) {
    var player = Application(appName)
    if (player.playerState() === 'playing') {
      var track = player.currentTrack()
      return `♬ : ${track.artist()} / ${track.name()}`
    }
  }
}

function run(args) {
  var currentTrack = trackForPlayer('iTunes') || trackForPlayer('spotify')
  if (currentTrack) {
    app = Application.currentApplication()
    app.includeStandardAdditions = true;
    return currentTrack
  }
}