#!/bin/sh

# Copyright (C) 2014-2019 Daniel Baumann <daniel.baumann@open-infrastructure.net>
#
# SPDX-License-Identifier: GPL-3.0+
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

PROJECT="open-infrastructure"
PROGRAM="container"
COMMAND="$(basename ${0})"

Parameters ()
{
	GETOPT_LONGOPTIONS="delay:,"
	GETOPT_OPTIONS="d:,"

	PARAMETERS="$(getopt --longoptions ${GETOPT_LONGOPTIONS} --name=${COMMAND} --options ${GETOPT_OPTIONS} --shell sh -- ${@})"

	if [ "${?}" != "0" ]
	then
		echo "'${COMMAND}': getopt exit" >&2
		exit 1
	fi

	eval set -- "${PARAMETERS}"

	while true
	do
		case "${1}" in
			-d|--delay)
				DELAY="${2}"
				shift 2
				;;

			--)
				shift 1
				break
				;;

			*)
				echo "'${COMMAND}': getopt error" >&2
				exit 1
				;;
		esac
	done
}

Usage ()
{
	echo "Usage: ${PROGRAM} ${COMMAND} [-d|--delay DELAY]" >&2
	exit 1
}

Parameters "${@}"

DELAY="${DELAY:-1}"
HOST="$(hostname -f 2> /dev/null || hostname)"

# Pre hooks
for FILE in "${HOOKS}/pre-${COMMAND}".* "${HOOKS}/${NAME}.pre-${COMMAND}"
do
	if [ -x "${FILE}" ]
	then
		"${FILE}"
	fi
done

# Run
Top ()
{
	HOME="$(tput cup 0 0)"
	ED="$(tput ed)"
	EL="$(tput el)"

	printf '%s%s' "${HOME}" "${ED}"

	while true
	do
		ROWS="$(tput lines)"
		COLS="$(tput cols)"
		CMD="${@}"

		${SHELL:=sh} -c "${CMD}" | head -n ${ROWS} | while IFS= read LINE
		do
			printf '%-*.*s%s\n' ${COLS} ${COLS} "${LINE}" "${EL}"
		done

		printf '%s%s' "${ED}" "${HOME}"
		sleep ${DELAY}
	done
}

trap 'clear' EXIT HUP INT QUIT TERM

Top "${PROGRAM} list && printf '%-59s %-19s\n' \"  Host: ${HOST}\" \"\$(date +%Y-%m-%d\ %H:%M:%S)\""

# Post hooks
for FILE in "${HOOKS}/post-${COMMAND}".* "${HOOKS}/${NAME}.post-${COMMAND}"
do
	if [ -x "${FILE}" ]
	then
		"${FILE}"
	fi
done