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

exp_setrstatus() {
	local _epsrs_rstatus="${1#\$}" _epsrs_status="${2}";
	eval ${_epsrs_rstatus}=\"${_epsrs_status}\";
	return 0;
};

#
# ex_init_env() - initialise build environment
# @_rstatus:		reference to out variable of status string on failure
# @_rhname:		reference to out variable of build hostname
# @_ruser:		reference to out variable of build user
# @_name_base:		base name for messages and theme file(s)
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_init_env() {
	local	_eie_rstatus="${1#\$}" _eie_rhname="${2#\$}" _eie_ruser="${3#\$}"	\
		_eie_name_base="${4}"							\
		_eie_fname="" _eie_lang="${LANG:-C}" _eie_lang_="" _eie_name=""		\
		_eie_rc=0;
	_eie_lang="${_eie_lang%%_*}";

	if ! cd "${0%/*}"; then
		_eie_rc=1;
		exp_setrstatus "${_eie_rstatus}" 'failed to change working directory to \`'"${0%/*}"''\''.';
	elif ! umask 022; then
		_eie_rc=1;
		exp_setrstatus "${_eie_rstatus}" 'failed to set umask(2).';
	elif ! eval ${_eie_rhname}=\"\$\(hostname\)\"; then
		_eie_rc=1;
		exp_setrstatus "${_eie_rstatus}" 'failed to obtain hostname.';
	elif ! eval ${_eie_ruser}=\"\$\(id -nu\)\"; then
		_eie_rc=1;
		exp_setrstatus "${_eie_rstatus}" 'failed to obtain username.';
	else
		for _eie_fname in				\
				$(find subr.ex -name *.subr)	\
				$(find subr.pkg -name *.subr)	\
				$(find subr.rtl -name *.subr)	\
				"etc/${_eie_name_base}.theme"	\
				;
		do
			if ! . "${_eie_fname}"; then
				_eie_rc=1;
				exp_setrstatus "${_eie_rstatus}" 'failed to source \`'"${_eie_fname}"''\''.';
				break;
			fi;
		done;

		if [ "${_eie_rc}" -eq 0 ]; then
			if [ -e "${_eie_name_base}.local" ]; then
				if ! . "${_eie_name_base}.local"; then
					_eie_rc=1;
					exp_setrstatus "${_eie_rstatus}" 'failed to source \`'"${_eie_name_base}"'.local'\''.';
				fi;
			fi;
		fi;

		if [ "${_eie_rc}" -eq 0 ]; then
			for _eie_name in ${_eie_name_base} rtl; do
				for _eie_lang_ in ${_eie_lang} C; do
					_eie_fname="etc/${_eie_name}.msgs.${_eie_lang_}";
					if [ -e "${_eie_fname}" ]; then
						if ! . "${_eie_fname}"; then
							_eie_rc=1;
							exp_setrstatus "${_eie_rstatus}" 'failed to source \`'"${_eie_fname}"''\''.';
							break;
						fi;

						if [ -e "${_eie_fname}.local" ]; then
							if ! . "${_eie_fname}.local"; then
								_eie_rc=1;
								exp_setrstatus "${_eie_rstatus}" 'failed to source \`'"${_eie_fname}"'.local'\''.';
							fi;
						fi;
						break;
					fi;
				done;

				if [ "${_eie_rc}" -ne 0 ]; then
					break;
				fi;
			done;
		fi;
	fi;
	export LANG=C LC_ALL=C;

	return "${_eie_rc}";
};

#
# ex_init_getopts() - process command-line arguments
# @_rstatus:	reference to out variable of status string on failure
# @_fn:		reference to function called to process command-line argument
# @_optstring:	getopts(1) optstring
# @...:		command-line arguments as "${@}"
#
# Return:	zero (0) on success, non-zero (>0) on failure
#
ex_init_getopts() {
	local	_eig_rstatus="${1#\$}" _eig_fn="${2}" _eig_optstring="${3}"	\
		_eig_arg="" _eig_fn_rc=0 _eig_opt="" _eig_shiftfl=0		\
		OPTARG="" OPTIND=0;
	shift 3;

	if ! "${_eig_fn}" init "${_eig_rstatus}"; then
		return 1;
	fi;

	while [ "${#}" -gt 0 ]; do
		case "${1}" in
		--*)
			"${_eig_fn}" longopt "${_eig_rstatus}" "${1}";
			_eig_fn_rc="${?}";

			case "${_eig_fn_rc}" in
			0)	;;
			1)	return 1; ;;

			*)	shift "$((${_eig_fn_rc} - 1))";
				continue; ;;
			esac;
			;;
		esac;

		if getopts "${_eig_optstring}" _eig_opt; then
			"${_eig_fn}" opt "${_eig_rstatus}" "${_eig_opt}" "${OPTARG:-}" "${@}";
			_eig_fn_rc="${?}";

			case "${_eig_fn_rc}" in
			0)	;;
			1)	return 1; ;;

			*)	shift "$((${_eig_fn_rc} - 1))";
				continue; ;;
			esac;
		else
			"${_eig_fn}" nonopt "${_eig_rstatus}" "${@}";
			_eig_fn_rc="${?}";

			case "${_eig_fn_rc}" in
			0)	;;
			1)	return 1; ;;

			*)	shift "$((${_eig_fn_rc} - 1))";
				continue; ;;
			esac;
		fi;
	done;

	if ! "${_eig_fn}" done "${_eig_rstatus}"; then
		return 1;
	fi;

	return 0;
};

#
# ex_init_help() - display usage screen and exit if requested in command-line arguments
# @_rstatus:	reference to out variable of status string on failure
# @_args_long:	optional list of long (prefixed with `--') arguments
# @_name_base:	base name for usage screen file
# @_optstring:	getopts(1) optstring
#
# Return:	zero (0) on success, non-zero (>0) on failure
#
ex_init_help() {
	local	_eih_rstatus="${1#\$}" _eih_args_long="${2}"	\
		_eih_name_base="${3}" _eih_optstring="${4}"	\
		_eih_arg_long="" _eih_opt="" _eih_shiftfl=0;
	shift 4;

	while [ "${#}" -gt 0 ]; do
		case "${1}" in
		-h|--help)
			if [ -t 1 ]; then
				cat "etc/${_eih_name_base}.usage";
			else
				sed 's/\[[0-9]\+m//g' "etc/${_eih_name_base}.usage";
			fi;
			exit 0;
			;;

		*=*)	shift; continue;
			;;

		*)	_eih_shiftfl=0;
			for _eih_arg_long in ${_eih_args_long}; do
				if [ "${_eih_arg_long}" = "${1}" ]; then
					_eih_shiftfl=1;
				fi;
			done;
			if [ "${_eih_shiftfl}" = 1 ]; then
				shift; continue;
			fi;
			;;
		esac;

		if getopts "${_eih_optstring}" _eih_opt 2>/dev/null; then
			case "${_eih_opt}" in
			h)
				if [ -t 1 ]; then
					cat "etc/${_eih_name_base}.usage";
				else
					sed 's/\[[0-9]\+m//g' "etc/${_eih_name_base}.usage";
				fi;
				exit 0;
				;;
			esac;
			shift $((${OPTIND}-1)); OPTIND=1;
		else
			shift;
		fi;
	done;

	return 0;
};

#
# ex_init_files() - initialise build files
# @_rstatus:				reference to out variable of status string on failure
# @_rclean_builds:			reference to in variable of -C argument value
# @_rdist:				reference to in variable of -D argument value
# @_build_log_fname:			absolute pathname to build log file
# @_build_log_last_fname:		absolute pathname to last build log file
# @_build_status_in_progress_fname:	absolute pathname to build-in-progress status file
# @_check_path_vars:			list of pathname variables to check
# @_clear_env_vars_except:		list of environment variables to not unset when clearing the environment
# @_clear_prefix_paths:			list of directory pathnames to clear in the top-level prefix
# @_dlcachedir:				absolute pathname to download cache directory
# @_prefix:				absolute pathname to top-level prefix
# @_prefix_rpm:				absolute pathname to RPM files prefix
# @_workdir:				absolute pathname to build-specific temporary directory
#
# Return:				zero (0) on success, non-zero (>0) on failure
#
ex_init_files() {
	local	_eif_rstatus="${1#\$}" _eif_rclean_builds="${2#\$}" _eif_rdist="${3#\$}"	\
		_eif_build_log_fname="${4}" _eif_build_log_last_fname="${5}"			\
		_eif_build_status_in_progress_fname="${6}" _eif_check_path_vars="${7}"		\
		_eif_clear_env_vars_except="${8}" _eif_clear_prefix_paths="${9}"		\
		_eif_dlcachedir="${10}" _eif_prefix="${11}" _eif_prefix_rpm="${12}"		\
		_eif_workdir="${13}"								\
		_eif_log_last_fname="" _eif_log_last_num=1 _eif_rc=0;

	if ! rtl_fileop mkdir "${_eif_dlcachedir}" "${_eif_workdir}"\
	|| rtl_lmatch "${_eif_rdist}" "rpm" ","\
	&& ! rtl_fileop mkdir "${_eif_prefix_rpm}"; then
		_eif_rc=1;
		rtl_setrstatus "${_eif_rstatus}" 'cannot create build directories.';
	elif [ -e "${_eif_build_status_in_progress_fname}" ]; then
		_eif_rc=1;
		rtl_setrstatus "${_eif_rstatus}" 'another build targeting this architecture and build type is currently in progress.';
	elif ! rtl_clean_env "${_eif_clear_env_vars_except}"; then
		_eif_rc=1;
		rtl_setrstatus "${_eif_rstatus}" 'failed to clean environment.';
	elif ! rtl_check_path_vars "${_eif_rstatus}" "${_eif_check_path_vars}"; then
		_eif_rc=1;
	else
		export TMP="${_eif_workdir}" TMPDIR="${_eif_workdir}";
		touch "${_eif_build_status_in_progress_fname}";

		if [ -e "${_eif_build_log_fname}" ]; then
			while [ -e "${_eif_build_log_fname}.${_eif_log_last_num}" ]; do
				: $((_eif_log_last_num+=1));
			done;

			_eif_log_last_fname="${_eif_build_log_fname}.${_eif_log_last_num}";
			rtl_fileop mv "${_eif_build_log_fname}" "${_eif_log_last_fname}";
			rtl_fileop ln_symbolic "${_eif_log_last_fname}" "${_eif_build_log_last_fname}";
		fi;

		rtl_fileop touch "${_eif_build_log_fname}"; rtl_log_set_fname "${_eif_build_log_fname}";
		if rtl_lmatch "${_eif_rclean_builds}" $"prefix" ","; then
			trap "rm -f \"${_eif_build_status_in_progress_fname}\" 2>/dev/null;

			rtl_log_msg \"fatalexit\" \"${MSG_build_aborted}\"" HUP INT TERM USR1 USR2;
			rtl_log_msg "info" "${MSG_build_clean_prefix}";

			for _eif_pname in ${_eif_clear_prefix_paths}; do
				if ! rtl_fileop rm "${_eif_prefix}/${_eif_pname}"; then
					_eif_rc=1;
					rtl_setrstatus "${_eif_rstatus}" 'failed to remove \`'"${_eif_prefix:+${_eif_prefix}/}${_eif_pname}'"'.';
					break;
				fi;
			done;

			trap - HUP INT TERM USR1 USR2;
		fi;

		export PATH="${_eif_prefix}/bin${PATH:+:${PATH}}";
	fi;

	return "${_eif_rc}";
};

#
# ex_init_logging() - initialise build logging
# @_rstatus:		reference to out variable of status string on failure
# @_rverbose_tags:	reference to inout variable of -V argument value
# @_verbose:		-[vV] argument value
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_init_logging() {
	local	_eil_rstatus="${1#\$}" _eil_rverbose_tags="${2#\$}" _eil_verbose="${3}"	\
		_eil_tag="" _eil_tags="" _eil_tags_enable="" _eil_rc=0;

	rtl_log_clear_tags;
	case "${_eil_verbose}" in

	0)	if eval [ \"\${#${_eil_rverbose_tags}}\" -eq 0 ]; then
			rtl_log_enable_tags "${LOG_TAGS_normal}";
		fi;
		;;

	1)	rtl_log_enable_tags "${LOG_TAGS_verbose}"; ;;

	*)	_eil_rc=1;
		rtl_setrstatus "${_eil_rstatus}" 'invalid verbosity level (max. -v)';
		;;

	esac;

	if [ "${_eil_rc}" -eq 0 ]; then
		eval _eil_tags="\${${_eil_rverbose_tags}}";
		case "${_eil_tags}" in

		+*)	rtl_log_enable_tags "${LOG_TAGS_normal}";
			eval ${_eil_rverbose_tags}="\${${_eil_rverbose_tags}#+}";
			;;

		*)	;;

		esac;

		rtl_llift2 "${_eil_rverbose_tags}" \$_eil_tags "," " ";

		for _eil_tag in ${_eil_tags}; do
			case "${_eil_tag}" in

			all)		rtl_log_enable_tags "${LOG_TAGS_all}"; ;;

			clear|none)	rtl_log_clear_tags; ;;

			normal)		rtl_log_enable_tags "${LOG_TAGS_normal}"; ;;

			verbose)	rtl_log_enable_tags "${LOG_TAGS_verbose}"; ;;

			*)		rtl_lsearch_patternl2 \$LOG_TAGS_all \$_eil_tags_enable "${_eil_tag}" ",";
					if [ "${#_eil_tags_enable}" -gt 0 ]; then
						rtl_log_enable_tags "${_eil_tags_enable}";
					else
						_eil_rc=1;
						rtl_setrstatus "${_eil_rstatus}" 'invalid log tag or tag pattern \`'"${_eil_tag}"''\''.';
						break;
					fi;
					;;

			esac;
		done;
	fi;

	return "${_eil_rc}";
};

#
# ex_init_prereqs() - initialise build prerequisite commands
# @_rstatus:	reference to out variable of status string on failure
# @_prereqs:	list of prerequisite commands
#
# Return:	zero (0) on success, non-zero (>0) on failure
#
ex_init_prereqs() {
	local	_eip_rstatus="${1#\$}" _eip_prereqs="${2}"	\
		_eip_rc=0;

	if ! rtl_check_prereqs "${_eip_rstatus}" ${_eip_prereqs}; then
		_eip_rc=1;
	elif ! awk -V 2>/dev/null | grep -q "^GNU Awk "; then
		_eip_rc=1;
		rtl_setrstatus "${_eip_rstatus}" 'awk(1) in \$PATH must be GNU Awk.';
	elif ! (FNAME="$(mktemp)" && { trap "rm -f \"\${FNAME}\"" EXIT;	\
			sed -i'' -e '' "${FNAME}" >/dev/null 2>&1; });
	then
		_eip_rc=1;
		rtl_setrstatus "${_eip_rstatus}" 'sed(1) in \${PATH} does not support the \`-i'\'' option.';
	fi;

	return "${_eip_rc}";
};

# vim:filetype=sh textwidth=0