#!/bin/sh
set -eu


directory="$(realpath "${1}")"
readonly directory
readonly age="+21" # Notation: +n  => "At least n days"

if [ ! -d "${directory}" ]; then
    echo "Directory '${directory}' not found" >&2
    return 1
fi

if [ -n "${DRYRUN:-}" ]; then
    echo "Deleting files not accessed for a ${age} days:"
    find "${directory}" -mindepth 1 -atime "${age}" -not -type d -not -name cleanup.log

    echo "Deleting empty directories:"
    find "${directory}" -mindepth 1 -type d -empty
else
    echo "Deleting files not accessed for a ${age} days:"
    find "${directory}" -mindepth 1 -atime "${age}" -not -type d -not -name cleanup.log -print -delete

    echo "Deleting empty directories:"
    find "${directory}" -mindepth 1 -type d -empty -print -delete
fi