#
# 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_}" != "${_env_var}" ]; then
			_env_vars_except="${_env_vars_except:+${_env_vars_except} }${_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_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="TERM" _pid_child="" _pid_top="";
	for _pid_top in $(pgrep -P "${_pid}"); do
		for _pid_child in $(pgrep -P "${_pid_top}" 2>/dev/null); do
			_pids_killed="${_pids_killed:+${_pids_killed} }${_pid_child}"; kill "-${_signal}" "${_pid_child}" 2>/dev/null;
		done;
		_pids_killed="${_pids_killed:+${_pids_killed} }${_pid_top}"; kill "-${_signal}" "${_pid_top}" 2>/dev/null;
	done;
};

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}" "${_vval_src}";
			_vars_set_tmp="${_vars_set_tmp:+${_vars_set_tmp} }PKG_${_vname_dst}";
		fi;
	done;
	_vars_set_old="$(rtl_get_var_unsafe "${_vars_set_vname}")";
	rtl_set_var_unsafe "${_vars_set_vname}"					\
		"${_vars_set_old:+${_vars_set_old} }${_vars_set_tmp}";
};

# vim:filetype=sh