#!/usr/bin/env bash

set -euxo pipefail;

backupsToKeep={{ backups_to_keep | quote }};

function onlyDatedFiles() {
  grep --perl-regexp '/\d+(-\d+)*(\.[^/]+)*$';
}

function getDirName() {
  grep --only-matching --perl-regexp '^.+(?=/[^/]+)';
}

find -H {{ backups_directory | quote }} -type f |
  onlyDatedFiles |
  getDirName |
  sort --unique |
  while read -r dir; do
  find "$dir" -type f | onlyDatedFiles | sort --reverse | tail --lines=+$((backupsToKeep + 1)) | xargs rm --force;
done