#

# set +o errexit -o noglob -o nounset is assumed.

#

rtl_basename() {

	local _fname="${1##*/}"; printf "%s" "${_fname}";

};

rtl_check_digest() {

	local _fname="${1}" _digest_check="${2}" _digest=""; RTL_CHECK_DIGEST_DIGEST="";

	if ! [ -e "${_fname}" ]; then

		return 1;

	else	set -- $(sha256sum "${_fname}");

		RTL_CHECK_DIGEST_DIGEST="${1}";

		if [ "${RTL_CHECK_DIGEST_DIGEST}" = "${_digest_check}" ]; then

			return 0;

		else

			return 1;

		fi;

	fi;

};

rtl_check_digest_file() {

	local _fname="${1}" _digest_check="${2}" _digest_fname="${3}" _digest="" RTL_CHECK_DIGEST_DIGEST="";

	if !  [ -e "${_digest_fname}" ]; then

		return 1;

	else	_digest="$(cat "${_digest_fname}")";

		if [ "${_digest}" != "${_digest_check}" ]\

		|| ! rtl_check_digest "${_fname}" "${_digest_check}"; then

			return 1;

		fi;

	fi;

};

rtl_check_path_vars() {

	local _vnames="${1}" _rc=0 _vname="" _vname_val=""; _status="";

	for _vname in ${_vnames}; do

		_vname_val="$(rtl_get_var_unsafe "${_vname}")";

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

			_rc=1; _status="Error: variable \`${_vname}' is empty or unset."; break;

		elif [ "${_vname_val#* *}" != "${_vname_val}" ]; then

			_rc=2; _status="Error: variable \`${_vname}' contains one or more whitespace characters."; break;

		fi;

	done;

	return "${_rc}";

};

rtl_dirname() {

	local _dname="${1%/*}";

	case "${_dname}" in

	"")	_dname="."; ;;

	*)	while rtl_matchr "${_dname}" "*/"; do

			_dname="${_dname%/}";

		done; ;;

	esac; printf "%s" "${_dname:-/}";

};

rtl_exists_any() {

	local _subdir="${1}"; shift;

	while [ "${#}" -gt 0 ]; do

		if [ -e "${_subdir}/${1}" ]; then

			return 0;

		else

			shift;

		fi;

	done; return 1;

};

rtl_flock_acquire() {

	local _fd="${1}" _conflict_exit_code="${2:-253}" _wait="${3:-3600}"

	while true; do

		if flock -E "${_conflict_exit_code}" -w "${_wait}" "${_fd}"; then

			break;

		elif [ "${?}" -eq "${_conflict_exit_code}" ]; then

			continue;

		else

			return "${?}";

		fi;

	done;

};

rtl_is_newer() {

	local _new_fname="${1}" _old_fname="${2}" _new_ts="" _old_ts="";

	if ! [ -e "${_old_fname}" ]; then

		return 0;

	else	_new_ts="$(stat -c %Y "${_new_fname}" 2>/dev/null)";

		_old_ts="$(stat -c %Y "${_old_fname}" 2>/dev/null)";

		if [ "${_new_ts:-0}" -gt "${_old_ts:-0}" ]; then

			return 0;

		else

			return 1;

		fi;

	fi;

};

# vim:filetype=sh