scripts/slib


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#!/bin/sh

argv0=$(basename "${0}")

err() {
	if [ "${1}" != "-x" ]; then
		printf "%s: " "${argv0}"
	else
		shift
	fi

	for line in "${@}"; do
		echo "${line}" >&2
	done
	exit 1
}

invalid_use() {
	[ "${1}" = "-h" ] && err -x "Try '${argv0} -h' for help."
	err "Invalid usage" "Try '${argv0} -h' for help."
}

check_program() {
	command -v "${1}" > /dev/null 2>&1 && return 0
	[ -n "${2}" ] && err "${2}"
	err "${1} must be installed"
}

run() {
	relstat=0
	if [ "${1}" = "--reload-status" ];then 
		relstat=1
		shift
	fi

	if ${1}; then
		[ -n "${2}" ] && echo "${2}"
	else
		[ -n "${3}" ] && err "${3}"
		exit 1 
	fi

	if [ "${relstat}" -eq 1 ]; then
		slreload || echo "Warning: Failed to reload slstatus" >&2
	fi

	exit 0
}