usb-log-watcher.sh

#!/bin/bash

PLUGGED="enumerated 0x05ac/110c/b817 (AirPods Max USB Audio / 1)"
UNPLUGGED="(AirPods Max USB Audio): hardware connection lost"
IDENTIFIER="AirPods Max"

PREVIOUS_STATE="disconnected"

log stream --predicate 'eventMessage contains "USB"' --info | while read -r line; do
  if echo "$line" | grep -q "$IDENTIFIER"; then
    if echo "$line" | grep -iq "$PLUGGED"; then
      if [ "$PREVIOUS_STATE" != "connected" ]; then
        #echo "[$(date)] AirPods Max connected – quitting SoundSource"
        osascript -e 'tell application "SoundSource" to quit'
        osascript -e 'display notification "AirPods Max connected – SoundSource quit" with title "USB Audio Event"'
        PREVIOUS_STATE="connected"
      fi
    elif echo "$line" | grep -iq "$UNPLUGGED"; then
      if [ "$PREVIOUS_STATE" != "disconnected" ]; then
        #echo "[$(date)] AirPods Max disconnected – launching SoundSource"
        osascript -e 'tell application "SoundSource" to activate'
        osascript -e 'display notification "AirPods Max disconnected – SoundSource started" with title "USB Audio Event"'
        PREVIOUS_STATE="disconnected"
      fi
    fi
  fi
done