#

# set +o errexit -o noglob is assumed.

#

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_clean_env() {

	local _env_vars_except="${1}" _env_var="" _env_vars="";

	_env_vars="$(export | sed -ne '/^export/{s/^export //;s/=.*$//p}')";

	for _env_var in ${_env_vars}; do

		if [ "${_env_var#DEFAULT_}" != "${_env_var}" ]\

		|| [ "${_env_var#PKG_}" != "${_env_var}" ]; then

			_env_vars_except="$(rtl_lconcat "${_env_vars_except}" "${_env_var}")";

		fi;

	done;

	rtl_unset_vars $(rtl_lfilter "${_env_vars}" "${_env_vars_except}");

};

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_export_vars() {

	local _unsetfl=0; [ "x${1}" = "x-u" ] && { _unsetfl=1; shift; };

	while [ "${#}" -ge 2 ]; do

		if [ -n "${2}" ]; then

			if [ "${_unsetfl:-0}" -eq 0 ]; then

				rtl_set_var_unsafe "${1}" "${2}"; export "${1}";

			else

				unset "${1}";

			fi;

		fi;

		shift 2;

	done;

};

rtl_filter_vars() {

	local _fn="${1}" _fnfl=0 _qchar="" _var_spec="" _vars="" _vname="" IFS="

";	for _var_spec in $(set); do

		case "${_qchar}" in

		"\"")	if [ "${_var_spec%\"}" != "${_var_spec}" ]; then

				_qchar="";

			fi;

			if [ "${_fnfl:-0}" -eq 1 ]; then

				_vars="$(rtl_lconcat "${_vars}" "${_var_spec}" "\n")";

			fi;

			continue; ;;

		"\'")	if [ "${_var_spec%\'}" != "${_var_spec}" ]; then

				_qchar="";

			fi;

			if [ "${_fnfl:-0}" -eq 1 ]; then

				_vars="$(rtl_lconcat "${_vars}" "${_var_spec}" "\n")";

			fi;

			continue; ;;

		*)	case "${_var_spec}" in

			[^=]*=\"*\")	_qchar=""; _vname="${_var_spec%%=\"*}"; ;;

			[^=]*=\"*)	_qchar="\""; _vname="${_var_spec%%=\"*}"; ;;

			[^=]*=\'*\')	_qchar=""; _vname="${_var_spec%%=\'*}"; ;;

			[^=]*=\'*)	_qchar="\'"; _vname="${_var_spec%%=\'*}"; ;;

			[^=]*=*)	_qchar=""; _vname="${_var_spec%%=*}"; ;;

			esac; ;;

		esac;

		if "${_fn}" "${_vname}"; then

			_vars="$(rtl_lconcat "${_vars}" "${_var_spec}" "\n")"; _fnfl=1;

		else

			_fnfl=0;

		fi;

	done;

	echo "${_vars}";

};

rtl_get_var_unsafe() {

	local _vname="";

	if [ "x${1}" = "x-u" ]; then

		shift; _vname="$(rtl_toupper "${1}")";

	else

		_vname="${1}";

	fi;

	eval echo \${${_vname}};

};

rtl_head() {

	local _pattern="${1}" _s="${2}";

	while true; do

		if [ "${_s%%${_pattern}}" = "${_s}" ]; then

			break;

		else

			_s="${_s%%${_pattern}}";

		fi;

	done;

	echo "${_s}";

};

rtl_kill_tree() {

	local _pid="${1}" _signal="${2:-TERM}" _pid_child="" _pids="";

	if _pids="$(pgrep -P "${_pid}")"\

	&& [ -n "${_pids}" ]; then

		for _pid_child in ${_pids}; do

			rtl_kill_tree "${_pid_child}" "${_signal}";

		done;

	fi;

	if [ "${_pid:-0}" -ne "${$}" ]\

	&& kill "-${_signal}" "${_pid}" 2>/dev/null; then

		RTL_KILL_TREE_PIDS="$(rtl_lconcat "${RTL_KILL_TREE_PIDS}" "${_pid}")";

	fi;

};

rtl_run_cmd_unsplit() {

	local _cmd="${1}" _cmdline="" _rc="" IFS; shift;

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

		[ -n "${1}" ] &&\

			_cmdline="${_cmdline:+${_cmdline}:}${1}";

		shift;

	done;

	IFS=:; ${_cmd} ${_cmdline}; _rc=$?;

	return ${_rc};

};

rtl_set_vars() {

	local	_vars_set_vname="${1}" _vname_dst="${2}" _vname_src_tmpls="${3}"	\

		_vars_set_old="" _vars_set_tmp="" _vname_src="";

	for _vname_src in $(rtl_toupper "${_vname_src_tmpls}"); do

		_vname_src="${_vname_src}_${_vname_dst}";

		_vval_src="$(rtl_get_var_unsafe "${_vname_src}")";

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

			rtl_set_var_unsafe "PKG_${_vname_dst}" "${_vval_src}";

			_vars_set_tmp="$(rtl_lconcat "${_vars_set_tmp}" "PKG_${_vname_dst}")";

		fi;

	done;

	_vars_set_old="$(rtl_get_var_unsafe "${_vars_set_vname}")";

	rtl_set_var_unsafe "${_vars_set_vname}"					\

		"$(rtl_lconcat "${_vars_set_old}" "${_vars_set_tmp}")";

};

# vim:filetype=sh