filter-dehydrated-cron-output

#!/bin/bash
set -euo pipefail
usage() {
    cat << EOF
Usage: dehydrated --cron | $0 [OPTIONS]

Filter dehydrated cron output to only contain error messages as upstream suggested in
https://github.com/dehydrated-io/dehydrated/issues/47#issuecomment-221867853

Options:
 -h, --help         display this help
EOF
    exit "$1"
}
main() {
    opts=$(getopt -o h -l help -n "$0" -- "$@") || usage 1
    eval set -- "$opts"
    while true; do
        case "$1" in
            -h | --help) usage 0 ;;
            --)
                shift
                break
                ;;
            *) break ;;
        esac
    done
    grep -v "^# INFO" | perl -0pe "s/Processing (.*)*\n \+ (.*)unchanged.\n \+ Checking .*\.\.\.\n \+ Valid till (.*) \(Longer than .* Skipping renew!//gm" | grep -v "^$"
}
caller 0 > /dev/null || main "$@"