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

rtl_check_prereqs() {
	local	_rcp_rstatus="${1#\$}"	\
		_rcp_cmd="" _rcp_cmds_missing="" _rcp_rc=0;
	shift;

	for _rcp_cmd in "${@}"; do
		if ! which "${_rcp_cmd}" >/dev/null 2>&1; then
			_rcp_cmds_missing="${_rcp_cmds_missing:+${_rcp_cmds_missing} }${_rcp_cmd}";
		fi;
	done;
	if [ "${_rcp_cmds_missing:+1}" = 1 ]; then
		_rcp_rc=1;
		rtl_setrstatus "${_rcp_rstatus}" 'Error: missing prerequisite package(s): '"${_rcp_cmds_missing}";
	fi;
	return "${_rcp_rc}";
};

rtl_clean_env() {
	local	_rce_env_vars_except="${1}"	\
		_rce_env_var="" _rce_env_vars="" _rce_env_vars_unset="";

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

	for _rce_env_var in ${_rce_env_vars}; do
		if [ "${_rce_env_var#DEFAULT_}" != "${_rce_env_var}" ]\
		|| [ "${_rce_env_var#PKG_}" != "${_rce_env_var}" ]; then
			rtl_lconcat \$_rce_env_vars_except "${_rce_env_var}";
		fi;
	done;
	rtl_lfilter2 \$_rce_env_vars \$_rce_env_vars_unset "${_rce_env_vars_except}";
	rtl_unset_vars ${_rce_env_vars_unset};

	return 0;
};

rtl_get_cpu_count() {
	local	_rgcc_rstatus="${1#\$}" _rgcc_rcount="${2#\$}"		\
		_rgcc_line="" _rgcc_ncpus=0 _rgcc_rc=0 _rgcc_sname="";

	_rgcc_sname="$(uname -s 2>/dev/null)" || return 1;
	case "${_rgcc_sname}" in

	Linux)	if [ ! -e "/proc/cpuinfo" ]; then
			_rgcc_rc=1;
			rtl_setrstatus "${_rgcc_rstatus}" 'Error: /proc/cpuinfo non-existent.';
		else	while read -r _rgcc_line; do
				if rtl_match "${_rgcc_line}" "processor*:"; then
					: $((_rgcc_ncpus+=1));
				fi;
			done < /proc/cpuinfo;
			_rgcc_rc=0;
			rtl_setrstatus "${_rgcc_rstatus}" "";
		fi; ;;

	*)	_rgcc_rc=1;
		rtl_setrstatus "${_rgcc_rstatus}" 'Error: unknown platform \`'"${_rgcc_sname}"''\''.';
		;;

	esac;
	eval ${_rgcc_rcount}='${_rgcc_ncpus}';
	return "${_rgcc_rc}";
};

rtl_get_var_unsafe() {
	local	_rgvu_rvname_out="${1#\$}"	\
		_rgvu_vname="";
	shift;

	if [ "x${1}" = "x-u" ]; then
		shift; _rgvu_vname="${1}"; rtl_toupper \$_rgvu_vname;
	else
		_rgvu_vname="${1}";
	fi;
	eval ${_rgvu_rvname_out}="\${${_rgvu_vname}:-}";
	return 0;
};

rtl_get_vars_fast() {
	local _rgvf_pattern="${1}";

	set | awk -F= '/'"${_rgvf_pattern}"'/{print $1}' | sort;
	return 0;
};

rtl_kill_tree() {
	local	_rkt_rpids="${1#\$}" _rkt_pid="${2}" _rkt_signal="${3:-TERM}"	\
		_rkt_pid_child="" _rkt_pids="";

	if _rkt_pids="$(pgrep -P "${_rkt_pid}")"\
	&& [ "${_rkt_pids:+1}" = 1 ]; then
		for _rkt_pid_child in ${_rkt_pids}; do
			rtl_kill_tree "${_rkt_rpids}" "${_rkt_pid_child}" "${_rkt_signal}";
		done;
	fi;
	if [ "${_rkt_pid:-0}" -ne "${$}" ]\
	&& kill "-${_rkt_signal}" "${_rkt_pid}" 2>/dev/null; then
		rtl_lconcat "${_rkt_rpids}" "${_rkt_pid}";
	fi;
	return 0;
};

rtl_prompt() {
	local rp_fmt="${1}" rp_choice=""; shift;

	printf "${rp_fmt}? (y|N) " "${@}";
	read -r rp_choice;
	case "${rp_choice}" in
	[yY])	rp_choice=1; ;;
	*)	rp_choice=0; ;;
	esac;
	return "${rp_choice}";
};

rtl_rc() {
	local _rr_nflag="${1}" _rr_cmd="${2}";
	shift 2;

	case "${_rr_nflag}" in
	1)	     if [ "${#}" -gt 0 ]; then
			rtl_log_msg "verbose" "${MSG_rtl_platform_rc1}" "${_rr_cmd}" "${*}";
		else
			rtl_log_msg "verbose" "${MSG_rtl_platform_rc2}" "${_rr_cmd}";
		fi; ;;
	*)	"${_rr_cmd}" "${@}"; ;;
	esac;
	return 0;
};

rtl_run_cmd_unsplit() {
	local	_rrcu_cmd="${1}"	\
		_rrcu_cmdline="" _rrcu_rc="" IFS;
	shift;

	while [ ${#} -gt 0 ]; do
		[ "${1:+1}" = 1 ] &&\
			_rrcu_cmdline="${_rrcu_cmdline:+${_rrcu_cmdline}:}${1}";
		shift;
	done;
	IFS=:; ${_rrcu_cmd} ${_rrcu_cmdline}; _rrcu_rc=$?;
	return ${_rrcu_rc};
};

rtl_set_vars() {
	local	_rsv_vars_set_vname="${1}" _rsv_vname_dst="${2}" _rsv_vname_src_tmpls="${3}"	\
		_rsv_vars_set_old="" _rsv_vars_set_tmp="" _rsv_vname_src="" _rsv_vnames_src="";

	rtl_toupper2 \$_rsv_vname_src_tmpls \$_rsv_vnames_src;
	for _rsv_vname_src in ${_rsv_vnames_src}; do
		_rsv_vname_src="${_rsv_vname_src}_${_rsv_vname_dst}";
		eval _rsv_vval_src="\${${_rsv_vname_src}:-}";
		if [ "${_rsv_vval_src:+1}" = 1 ]; then
			eval PKG_${_rsv_vname_dst}='${_rsv_vval_src}';
			_rsv_vars_set_tmp="${_rsv_vars_set_tmp:+${_rsv_vars_set_tmp} }PKG_${_rsv_vname_dst}";
		fi;
	done;
	eval _rsv_vars_set_old="\${${_rsv_vars_set_vname}}";
	rtl_set_var_unsafe "${_rsv_vars_set_vname}" "${_rsv_vars_set_old:+${_rsv_vars_set_old} }${_rsv_vars_set_tmp}";

	return 0;
};

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