nix-config/pkgs/change-audio/change-audio

#!/usr/bin/env bash

set -euo pipefail

if [ "$1" = "up" ]; then
    upDown="-i"
else
    upDown="-d"
fi

pamixer --allow-boost "$upDown" "$2"
newVolume="$(pamixer --get-volume || true)"
[ "$(pamixer --get-volume-human)" = "muted" ] && isMuted=true

MSG="Set volume to $newVolume%"
if [ "${isMuted:-false}" = true ]; then
    MSG="$MSG (muted)"
fi

notify-send -u low \
    -h string:x-canonical-private-synchronous:change-audio \
    -h "int:value:$newVolume" \
    -- "$MSG"