Volume control with pactl and notify-send

volume.sh

#!/usr/bin/env bash

ICON_DIR="/usr/share/icons/breeze-dark/status/24"
APP_NAME="$(hostname)"
ID=1847

function get_volume {
  pactl list sinks | grep 'Volume: front-left' | awk '{print $5}' | sed 's/%//g'
}

function mute {
  pactl set-sink-mute @DEFAULT_SINK@ toggle
}

function is_muted {
  pactl list sinks | grep 'Mute: yes' &> /dev/null
}

function send_notification {
  volume=`get_volume`
  if is_muted ; then
    icon_name="$ICON_DIR/audio-volume-muted.svg"
    notify-send -a "$APP_NAME" -i $icon_name -r "$ID" "Volume muted" -t 1500 -h int:value:$volume
  else
    if [ "$volume" -gt 70 ]; then
      icon_name="$ICON_DIR/audio-volume-high.svg"
    elif [ "$volume" -gt 30 ]; then
      icon_name="$ICON_DIR/audio-volume-medium.svg"
    else
      icon_name="$ICON_DIR/audio-volume-low.svg"
    fi
    notify-send -a "$APP_NAME" -i $icon_name -r "$ID" "Volume: $volume%" -t 1500 -h int:value:$volume
  fi
}

case $1 in
  up)
    if is_muted ; then
      pactl set-sink-mute @DEFAULT_SINK@ 0
    fi
    # don't exceed 100%
    if [ $(get_volume) -ge 100 ]; then
      send_notification
      exit
    fi
    pactl set-sink-volume @DEFAULT_SINK@ +2%
    send_notification
    ;;
  down)
    if is_muted ; then
      send_notification
      exit
    fi
    # don't go below 0%
    if [ $(get_volume) -le 0 ]; then
      mute
      send_notification
      exit
    fi
    pactl set-sink-volume @DEFAULT_SINK@ -2%
    send_notification
    ;;
  mute)
    pactl set-sink-mute @DEFAULT_SINK@ toggle
    send_notification
    ;;
  *)
    echo "Usage: volume {up|down|mute}"
    ;;
esac