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#!/bin/sh

usage() {

    help="flush-files.sh -n number_of_files_to_keep [-m email_address]\n

usage: flush files from a folder except a number equal to argument.\n

It only prints a warning if scripts-utils.sh is not imported in order to be used

from the terminal."

    echo -e "${help}"

}

number_of_files_to_keep=''

email_address=''

while getopts "hn:m:" opt; do

    case "${opt}" in

	h)

	    usage; exit 0;;

	n)

	    number_of_files_to_keep="${OPTARG}";;

	m)

	    email_address="${OPTARG}";;

	:)

	    echo "Option -$OPTARG requires an argument." >&2

	    usage >&2; exit 1;;

	\?)

	    usage >&2; exit 1;;

    esac

done

shift $((OPTIND-1))

# Check that all required parameters are there

if [ -z "${number_of_files_to_keep}" ]; then

    echo "At least a required parameter is missing." >&2

    usage >&2

    exit 1

fi

# Check if scripts-utils.sh is imported.

if [ -z "${scripts_utils}" ] ; then

    echo "Import of scripts-utils.sh required."

    . scripts-utils.sh

fi

# Must not be quoted to avoid problem with ((…))

backups_number=$(ls | wc -l)

number_of_backups_to_delete=$((backups_number - ${number_of_files_to_keep}))

if [ "${number_of_backups_to_delete}" -gt 0 ] ; then

    ls | head "-${number_of_backups_to_delete}" | xargs rm

else

    if [ -n "${email_address}" ] ; then

        dir=$(pwd)

        echo "There are not enough files in $dir to Flush it. Check if backup script works fine." | mail -s "[db] $dir has a backup problem" "${email_address}"

    fi

fi