Cycles pulse audio output devices

cycle_audio_output.sh

#! /bin/bash
#################################################################################
#     File Name           :     cycle_audio_output.sh
#     Created By          :     jguer
#     Creation Date       :     [2016-01-16 22:55]
#     Last Modified       :     [2016-01-17 00:42]
#     Description         :      Cycles audio output devices
#################################################################################
VERBOSITY=0
NOTIFICATIONS=0

function swap_sink {
  #Treats pulseaudio sink list to avoid calling pacmd list-sinks twice
  o_pulseaudio=$(pacmd list-sinks| grep -e 'index' -e 'device.description')

  #Gets max sink index
  nsinks=$(echo "$o_pulseaudio" | grep index | cut -d: -f2 | sed '$!d')
  if [ $VERBOSITY == 1 ]; then
    echo "Max sink index: $nsinks"
  fi

  #Gets present default sink index
  ssink=$(echo "$o_pulseaudio" | grep "* index" | cut -d: -f2)
  if [ $VERBOSITY == 1 ]; then
    echo "Selected sink index: $ssink"
  fi

  #Sets new sink index
  newsink=$((++ssink))
  if [ "$newsink" -gt "$nsinks" ]; then
    newsink=0
  fi

  if [ $VERBOSITY == 1 ]; then
    echo "New sink index: $newsink"
  fi
  $(pacmd set-default-sink $newsink)

  #Moves all audio threads to new sink
  inputs=`pactl list sink-inputs short | cut -f 1`
  for i in $inputs; do
    $(pacmd move-sink-input $i $newsink)
    if [ $VERBOSITY == 1 ]; then
      echo "Moved input $i to card with index $newsink"
    fi
  done
}

function send_notification {
  o_pulseaudio=$(pacmd list-sinks| grep -e 'index' -e 'device.description')
  device_name=$(echo "$o_pulseaudio" | sed -n '/* index/{n;p;}' | grep -o '".*"' | sed 's/"//g')
  notify-send "Output cycle" "Changed output to ${device_name}" --icon=audio-headphones-symbolic
}

#MAIN
while getopts "vn" opt; do
  case "${opt}" in
    v)
      VERBOSITY=1
      echo VERBOSE
      ;;
    n)
      NOTIFICATIONS=1
      ;;
    *)
      echo "Invalid option: -$OPTARG" >&2
      ;;
  esac
done
shift $((OPTIND-1))

swap_sink

if [ $NOTIFICATIONS == 1 ]; then
  send_notification
fi

Hey man, your script is great and I use it a lot. I do seem to have a problem though when the sinks aren't sequential, it won't switch. This usually happens if I unplug a device then try to switch. I'd attempt to mod it myself but my shell script skills are basically non-existent.
Thanks in advance if you can help me out :)

@frebib, I achieved cycling through the sinks with this one-liner (sorry for the length 🙃):

pacmd set-default-sink $((s=$(pacmd list-sinks | grep index); echo "$s"; echo "$s") | grep '\*' -m 1 -A 1 | tail -1 | sed -e 's/    index: //')

It works no matter what the indices are. For example, it worked for me when I had indices 1 and 3:

io@arch ~ $ pacmd list-sinks | grep index
  * index: 1
    index: 3
io@arch ~ $ pacmd set-default-sink $((s=$(pacmd list-sinks | grep index); echo "$s"; echo "$s") | grep '\*' -m 1 -A 1 | tail -1 | sed -e 's/    index: //')
io@arch ~ $ pacmd list-sinks | grep index
    index: 1
  * index: 3