#!/bin/bash

case "${1:-}" in
    up)   pamixer -i 5 ;;
    down) pamixer -d 5 ;;
    mute) pamixer -t ;;
    *)    echo "usage: $0 up|down|mute" >&2; exit 1 ;;
esac

if [ "$(pamixer --get-mute)" = "true" ]; then
    notify-send -h string:x-canonical-private-synchronous:volume \
                -h int:value:0 \
                -t 1500 \
                "Muted"
else
    LEVEL=$(pamixer --get-volume)
    notify-send -h string:x-canonical-private-synchronous:volume \
                -h int:value:"$LEVEL" \
                -t 1500 \
                "Volume: ${LEVEL}%"
fi