SH_LOG_LEVEL_FATAL=0
SH_LOG_LEVEL_ERROR=1
SH_LOG_LEVEL_WARN=2
SH_LOG_LEVEL_INFO=3
SH_LOG_LEVEL_DEBUG=4
SH_LOG_LEVEL_TRACE=5

SH_LOG_LEVEL=${SH_LOG_LEVEL_INFO}

sh_log() { sh_log_info "${@}"; }

sh_log_debug() {
	if [ "${SH_LOG_LEVEL}" -ge "${SH_LOG_LEVEL_DEBUG}" ]; then
		_sh_log "[DEBUG]" "${@}"
	fi
}

sh_log_error() {
	local code="${1}"
	shift
	[ -n "${code}" ] || sh_log_fatal 1 "No error code"
	if [ "${SH_LOG_LEVEL}" -ge "${SH_LOG_LEVEL_ERROR}" ]; then
		_sh_log "[ERROR]" "${@}" >&2
		return "${code}"
	fi
}

sh_log_fatal() {
	local code="${1}"
	shift
	[ -n "${code}" ] || sh_log_fatal 1 "No error code"
	if [ "${SH_LOG_LEVEL}" -ge "${SH_LOG_LEVEL_FATAL}" ]; then
		_sh_log "[FATAL]" "${@}" >&2
		exit "${code}"
	fi
}

sh_log_info() {
	if [ "${SH_LOG_LEVEL}" -ge "${SH_LOG_LEVEL_INFO}" ]; then
		_sh_log "" "${@}"
	fi
}

sh_log_trace() {
	if [ "${SH_LOG_LEVEL}" -ge "${SH_LOG_LEVEL_TRACE}" ]; then
		_sh_log "[TRACE]" "${@}"
	fi
}

sh_log_warn() {
	if [ "${SH_LOG_LEVEL}" -ge "${SH_LOG_LEVEL_WARN}" ]; then
		_sh_log "[ WARN]" "${@}"
	fi
}

_sh_log() {
	local prefix="${1}"
	shift
	local line
	for line in "${@}"; do
		if [ -n "${prefix}" ]; then
			_sh_main_log "${prefix} ${line}"
		else
			_sh_main_log "${line}"
		fi
	done
}