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#
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# set +o errexit -o noglob -o nounset is assumed.
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#
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rtl_check_path_vars() {
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	local _vnames="${1}" _rc=0 _vname="" _vname_val=""; _status="";
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	for _vname in ${_vnames}; do
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		_vname_val="$(rtl_get_var_unsafe "${_vname}")";
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		if [ -z "${_vname_val}" ]; then
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			_rc=1; _status="Error: variable \`${_vname}' is empty or unset."; break;
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		elif [ "${_vname_val#* *}" != "${_vname_val}" ]; then
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			_rc=2; _status="Error: variable \`${_vname}' contains one or more whitespace characters."; break;
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		fi;
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	done;
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	return "${_rc}";
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};
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rtl_check_prereqs() {
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	local _cmd="" _cmds_missing="" _rc=0; _status="";
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	for _cmd in "${@}"; do
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		if ! which "${_cmd}" >/dev/null 2>&1; then
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			_cmds_missing="${_cmds_missing:+${_cmds_missing} }${_cmd}";
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		fi;
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	done;
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	if [ -n "${_cmds_missing}" ]; then
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		_rc=1; _status="Error: missing prerequisite package(s): ${_cmds_missing}";
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	fi;
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	return "${_rc}";
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};
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rtl_clean_env() {
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	local _env_vars_except="${1}" _env_var="" _env_vars="";
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	_env_vars="$(export | sed -ne '/^export/{s/^export //;s/=.*$//p}')";
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	for _env_var in ${_env_vars}; do
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		if [ "${_env_var#DEFAULT_}" != "${_env_var}" ]\
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		|| [ "${_env_var#PKG_}" != "${_env_var}" ]; then
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			_env_vars_except="$(rtl_lconcat "${_env_vars_except}" "${_env_var}")";
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		fi;
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	done;
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	rtl_unset_vars $(rtl_lfilter "${_env_vars}" "${_env_vars_except}");
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};
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rtl_dirname() {
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	local _dname="${1%/*}";
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	while rtl_matchr "${_dname}" "*/"; do
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		_dname="${_dname%/}";
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	done; printf "%s" "${_dname:-/}";
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};
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rtl_exists_any() {
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	local _subdir="${1}"; shift;
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	while [ "${#}" -gt 0 ]; do
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		if [ -e "${_subdir}/${1}" ]; then
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			return 0;
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		else
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			shift;
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		fi;
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	done; return 1;
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};
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rtl_export_vars() {
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	local _unsetfl=0; [ "x${1}" = "x-u" ] && { _unsetfl=1; shift; };
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	while [ "${#}" -ge 2 ]; do
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		if [ -n "${2}" ]; then
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			if [ "${_unsetfl:-0}" -eq 0 ]; then
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				rtl_set_var_unsafe "${1}" "${2}"; export "${1}";
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			else
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				unset "${1}";
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			fi;
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		fi;
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		shift 2;
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	done;
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};
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rtl_filter_vars() {
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	local _fn="${1}" _fnfl=0 _qchar="" _var_spec="" _vars="" _vname="" IFS;
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	rtl_set_IFS_nl;
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	for _var_spec in $(set); do
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		case "${_qchar}" in
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		"\"")	if [ "${_var_spec%\"}" != "${_var_spec}" ]; then
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				_qchar="";
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			fi;
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			if [ "${_fnfl:-0}" -eq 1 ]; then
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				_vars="$(rtl_lconcat "${_vars}" "${_var_spec}" "\n")";
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			fi;
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			continue; ;;
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		"\'")	if [ "${_var_spec%\'}" != "${_var_spec}" ]; then
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				_qchar="";
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			fi;
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			if [ "${_fnfl:-0}" -eq 1 ]; then
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				_vars="$(rtl_lconcat "${_vars}" "${_var_spec}" "\n")";
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			fi;
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			continue; ;;
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		*)	case "${_var_spec}" in
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			[^=]*=\"*\")	_qchar=""; _vname="${_var_spec%%=\"*}"; ;;
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			[^=]*=\"*)	_qchar="\""; _vname="${_var_spec%%=\"*}"; ;;
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			[^=]*=\'*\')	_qchar=""; _vname="${_var_spec%%=\'*}"; ;;
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			[^=]*=\'*)	_qchar="\'"; _vname="${_var_spec%%=\'*}"; ;;
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			[^=]*=*)	_qchar=""; _vname="${_var_spec%%=*}"; ;;
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			esac; ;;
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		esac;
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		if "${_fn}" "${_vname}"; then
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			_vars="${_vars:+${_vars}
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}${_var_spec}"; _fnfl=1;
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		else
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			_fnfl=0;
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		fi;
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	done;
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	printf "%s" "${_vars}";
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};
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rtl_flock_acquire() {
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	local _fd="${1}" _conflict_exit_code="${2:-622}" _wait="${3:-3600}"
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	while true; do
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		if flock -E "${_conflict_exit_code}" -w "${_wait}" "${_fd}"; then
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			break;
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		elif [ "${?}" -eq "${_conflict_exit_code}" ]; then
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			continue;
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		else
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			return "${?}";
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		fi;
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	done;
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};
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rtl_get_cpu_count() {
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	local _line="" _ncpus=0 _rc=0 _sname="$(uname -s 2>/dev/null)"; _status="";
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	case "${_sname}" in
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	Linux)	if [ ! -e "/proc/cpuinfo" ]; then
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			_rc=1; _status="Error: /proc/cpuinfo non-existent.";
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		else	while read -r _line; do
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				if rtl_match "${_line}" "processor*:"; then
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					: $((_ncpus+=1));
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				fi;
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			done < /proc/cpuinfo; printf "%s" "${_ncpus}";
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		fi; ;;
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	*)	_rc=1; _status="Error: unknown platform \`${_sname}'."; ;;
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	esac; return "${_rc}";
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};
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rtl_get_var_unsafe() {
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	local _vname="";
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	if [ "x${1}" = "x-u" ]; then
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		shift; _vname="$(rtl_toupper "${1}")";
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	else
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		_vname="${1}";
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	fi;
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	eval echo \${${_vname}} 2>/dev/null;
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};
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rtl_get_vars_fast() {
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	local _pattern="${1}";
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	set | awk -F= '/'"${_pattern}"'/{print $1}' | sort;
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};
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rtl_head() {
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	local _pattern="${1}" _s="${2}";
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	while true; do
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		if [ "${_s%%${_pattern}}" = "${_s}" ]; then
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			break;
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		else
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			_s="${_s%%${_pattern}}";
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		fi;
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	done;
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	printf "%s" "${_s}";
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};
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rtl_is_newer() {
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	local _new_fname="${1}" _old_fname="${2}" _new_ts="" _old_ts="";
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	if ! [ -e "${_old_fname}" ]; then
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		return 0;
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	else	_new_ts="$(stat -c %Y "${_new_fname}" 2>&1)";
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		_old_ts="$(stat -c %Y "${_old_fname}" 2>&1)";
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		if [ "${_new_ts:-0}" -gt "${_old_ts:-0}" ]; then
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			return 0;
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		else
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			return 1;
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		fi;
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	fi;
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};
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rtl_kill_tree() {
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	local _pid="${1}" _signal="${2:-TERM}" _pid_child="" _pids="";
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	if _pids="$(pgrep -P "${_pid}")"\
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	&& [ -n "${_pids}" ]; then
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		for _pid_child in ${_pids}; do
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			rtl_kill_tree "${_pid_child}" "${_signal}";
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		done;
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	fi;
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	if [ "${_pid:-0}" -ne "${$}" ]\
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	&& kill "-${_signal}" "${_pid}" 2>/dev/null; then
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		RTL_KILL_TREE_PIDS="$(rtl_lconcat "${RTL_KILL_TREE_PIDS}" "${_pid}")";
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	fi;
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};
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rtl_percentage() {
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	local _in="${1}" _max="${2}" _perc;
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	_perc="$((100 * ${_in} + ${_max} / 2))";
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	_perc="$((${_perc} ? ${_perc} / ${_max} : ${_perc}))";
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	printf "%d\n" "${_perc}";
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};
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rtl_prompt() {
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	local _fmt="${1}" _choice=""; shift;
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	printf "${_fmt}? (y|N) " "${@}";
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	read -r _choice;
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	case "${_choice}" in
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	[yY])	_choice=1; ;;
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	*)	_choice=0; ;;
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	esac;
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	return "${_choice}";
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};
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rtl_rc() {
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	local _nflag="${1}" _cmd="${2}"; shift 2;
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	case "${_nflag}" in
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	1)	     if [ "${#}" -gt 0 ]; then
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			rtl_log_msg notice "Command line: %s %s" "${_cmd}" "${*}";
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		else
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			rtl_log_msg notice "Command line: %s" "${_cmd}";
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		fi; ;;
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	*)	"${_cmd}" "${@}";
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	esac;
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};
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rtl_run_cmd_unsplit() {
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	local _cmd="${1}" _cmdline="" _rc="" IFS; shift;
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	while [ ${#} -gt 0 ]; do
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		[ -n "${1}" ] &&\
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			_cmdline="${_cmdline:+${_cmdline}:}${1}";
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		shift;
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	done;
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	IFS=:; ${_cmd} ${_cmdline}; _rc=$?;
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	return ${_rc};
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};
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rtl_set_vars() {
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	local	_vars_set_vname="${1}" _vname_dst="${2}" _vname_src_tmpls="${3}"	\
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		_vars_set_old="" _vars_set_tmp="" _vname_src="";
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	for _vname_src in $(rtl_toupper "${_vname_src_tmpls}"); do
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		_vname_src="${_vname_src}_${_vname_dst}";
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		_vval_src="$(rtl_get_var_unsafe "${_vname_src}")";
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		if [ -n "${_vval_src}" ]; then
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			rtl_set_var_unsafe "PKG_${_vname_dst}" "${_vval_src}";
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			_vars_set_tmp="$(rtl_lconcat "${_vars_set_tmp}" "PKG_${_vname_dst}")";
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		fi;
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	done;
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	_vars_set_old="$(rtl_get_var_unsafe "${_vars_set_vname}")";
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	rtl_set_var_unsafe "${_vars_set_vname}"					\
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		"$(rtl_lconcat "${_vars_set_old}" "${_vars_set_tmp}")";
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};
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# vim:filetype=sh