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

buildp_init_args() {
	local	_foundfl=0 _group="" _pkg_names_unknown="" _rc=0	\
		EX_PKG_BUILD_GROUPS EX_PKG_BUILD_GROUPS_NOAUTO; _status="";

	case "${ARG_FETCH_FORCE}" in
	ipv4)	DEFAULT_GIT_ARGS="$(rtl_lconcat "-4" "${DEFAULT_GIT_ARGS}")";
		DEFAULT_WGET_ARGS="$(rtl_lconcat "-4" "${DEFAULT_WGET_ARGS}")"; ;;
	ipv6)	DEFAULT_GIT_ARGS="$(rtl_lconcat "-6" "${DEFAULT_GIT_ARGS}")";
		DEFAULT_WGET_ARGS="$(rtl_lconcat "-6" "${DEFAULT_WGET_ARGS}")"; ;;
	esac;
	if [ "${BUILD_HNAME:+1}" != 1 ]\
	&& ! BUILD_HNAME="$(hostname)"; then
		_rc=1; _status="failed to obtain hostname.";
	elif [ "${ARG_DUMP_ON_ABORT:-0}" -eq 1 ]\
	&&   [ "${ARG_RELAXED:-0}" -eq 1 ]; then
		_rc=1; _status="--dump-on-abort excludes -R.";
	elif [ "${ARG_AS_NEEDED:-0}" -eq 1 ]\
	&&   [ -e "${PREFIX}/build.gitref" ]\
	&&   [ "$(git rev-parse HEAD)" = "$(cat "${PREFIX}/build.gitref")" ]; then
		_rc=0; _status="Git repository has not changed since last build and --as-needed was specified.";
	elif ! ex_pkg_process_restart_spec \$ARG_RESTART \$ARG_RESTART_AT \$ARG_RESTART_RECURSIVE; then
		_rc=1; _status="failed to process -r specification: ${_status}.";
	elif ! ex_pkg_load_groups; then
		_rc=1; _status="failed to load build groups.";
	else	if ! rtl_lmatch "${ARG_DIST:-}" "rpm" ","\
		&& [ "${ARG_DUMP_IN:+1}" != 1 ]\
		&& [ "${ARG_DUMP_ON_ABORT:-0}" -eq 0 ]; then
			EX_PKG_BUILD_GROUPS="$(rtl_lfilter "${EX_PKG_BUILD_GROUPS}" "host_deps_rpm")";
		fi;
		if [ "${BUILD_GROUPS:+1}" != 1 ]; then
			BUILD_GROUPS="${EX_PKG_BUILD_GROUPS}";
		else	_foundfl=0; for _group in ${BUILD_GROUPS}; do
				if rtl_lmatch "${EX_PKG_BUILD_GROUPS}" "${_group}"; then
					_foundfl=1; break;
				fi;
			done;
			if [ "${_foundfl}" -eq 0 ]; then
				_foundfl=0; for _group in ${BUILD_GROUPS}; do
					if rtl_lmatch "${EX_PKG_BUILD_GROUPS}" "${_group}"; then
						_rc=1; _status="unknown build group \`${_group}'."; break;
					fi;
				done;
			fi;
		fi;
		if [ "${_rc:-0}" -eq 0 ]; then
			if [ "${ARG_DIST:+1}" = 1 ]; then
				BUILD_GROUPS="$(rtl_lconcat "$(rtl_lfilter "${BUILD_GROUPS}" "dist")" "dist")";
			fi;
			if [ "${ARG_RESTART:+1}" = 1 ]\
			&& ! rtl_lmatch "${ARG_RESTART}" "ALL LAST"; then
				for _pkg_name in ${ARG_RESTART}; do
					if ! ex_pkg_find_package "${BUILD_GROUPS}" "${_pkg_name}" >/dev/null; then
						_pkg_names_unknown="$(rtl_lconcat "${_pkg_names_unknown}" "${_pkg_name}")";
					fi;
				done;
				case "$(rtl_llength "${_pkg_names_unknown}")" in
				0)	;;
				1)	_rc=1; _status="unknown package \`${_pkg_names_unknown}'."; ;;
				*)	_rc=1; _status="unknown packages: $(rtl_subst "${_pkg_names_unknown}" " " ", ")"; ;;
				esac;
			fi;
		fi;
	fi; return "${_rc}";
};

buildp_init_env() {
	local _fname="" _rc=0; _status="";

	if ! cd "${0%/*}"; then
		printf "Error: failed to change working directory to \`${0%/*}'." >&2; exit 1;
	elif ! umask 022; then
		printf "Error: failed to set umask(2).\n" >&2; exit 1;
	elif ! BUILD_USER="$(id -nu)"; then
		printf "Error: failed to obtain username." >&2; exit 1;
	else	for _fname in	\
				$(find subr.rtl -name *.subr)	\
				$(find subr -name *.subr)	\
				etc/build.theme			\
				;
		do
			if ! . "${_fname}"; then
				printf "Error: failed to source \`%s'.\n" "${_fname}" >&2; exit 1;
			fi;
		done;
	fi; return "${_rc}";
};

buildp_init_files() {
	local _log_last_fname="" _log_last_num=1 _rc=0; _status=""

	if ! rtl_fileop mkdir "${BUILD_DLCACHEDIR}" "${BUILD_WORKDIR}"\
	|| rtl_lmatch "${ARG_DIST}" "rpm" ","\
	&& ! rtl_fileop mkdir "${PREFIX_RPM}"; then
		_rc=1; _status="cannot create build directories.";
	elif [ -e "${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}" ]; then
		_rc=1; _status="another build targeting this architecture and build type is currently in progress.";
	elif ! rtl_clean_env "${DEFAULT_CLEAR_ENV_VARS_EXCEPT}"; then
		_rc=1; _status="failed to clean environment.";
	elif ! rtl_check_path_vars "${DEFAULT_CHECK_PATH_VARS}"; then
		_rc=1; _status="${_status}";
	else	export TMP="${BUILD_WORKDIR}" TMPDIR="${BUILD_WORKDIR}";
		touch "${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}";
		if [ -e "${DEFAULT_BUILD_LOG_FNAME}" ]; then
			while [ -e "${DEFAULT_BUILD_LOG_FNAME}.${_log_last_num}" ]; do
				: $((_log_last_num+=1));
			done;
			_log_last_fname="${DEFAULT_BUILD_LOG_FNAME}.${_log_last_num}";
			rtl_fileop mv "${DEFAULT_BUILD_LOG_FNAME}" "${_log_last_fname}";
			rtl_fileop ln_symbolic "${_log_last_fname}" "${DEFAULT_BUILD_LOG_LAST_FNAME}";
		fi;
		rtl_fileop touch "${DEFAULT_BUILD_LOG_FNAME}"; rtl_log_set_fname "${DEFAULT_BUILD_LOG_FNAME}";
		if rtl_lmatch "${ARG_CLEAN_BUILDS}" "prefix" ","; then
			trap "rm -f \"${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}\" 2>/dev/null; rtl_log_msg \"fatalexit\" \"Build aborted.\"" HUP INT TERM USR1 USR2;
			rtl_log_msg "info" "-C prefix specified, cleaning prefix...";
			for _pname in ${DEFAULT_CLEAR_PREFIX_PATHS}; do
				if ! rtl_fileop rm "${PREFIX}/${_pname}"; then
					_rc=1; _status="failed to remove \`${PREFIX}/${_pname}'."; break;
				fi;
			done;
			trap - HUP INT TERM USR1 USR2;
		fi;
		export PATH="${PREFIX}/bin${PATH:+:${PATH}}";
	fi;
	return "${_rc}";
};

buildp_init_getopts() {
	local _arg="" _opt="" _rc=0 _shiftfl=0 OPTIND=0; _status="";

	: ${ARCH:="nt64"}; : ${BUILD_KIND:="debug"};
	ARG_AS_NEEDED=0; ARG_CLEAN_BUILDS=""; ARG_DEBUG_MINIPIX=0; ARG_DIST=""; ARG_DUMP_IN="";
	ARG_DUMP_ON_ABORT=0; ARG_FETCH_FORCE=""; ARG_PARALLEL=1; ARG_RELAXED=0; ARG_RESET_PKG=0;
	ARG_RESTART=""; ARG_RESTART_AT=""; ARG_RESTART_RECURSIVE=""; ARG_VERBOSE=0; ARG_VERBOSE_TAGS="";

	while [ "${#}" -gt 0 ]; do
		case "${1}" in
		--as-needed)	ARG_AS_NEEDED=1; _shiftfl=1; ;;
		--dump-in)	if [ "${#}" -ge 2 ]; then
					ARG_DUMP_IN="${2}"; ARG_DUMP_ON_ABORT=1; _shiftfl=2;
				else
					_rc=1; _status="missing argument to option --dump-in.";
				fi; ;;
		--dump-on-abort)
				ARG_DUMP_ON_ABORT=1; _shiftfl=1; ;;
		--debug-minipx)	ARG_DEBUG_MINIPIX=1; _shiftfl=1; ;;
		--help)
			if [ -t 1 ]; then
				cat etc/build.usage;
			else
				sed 's/\[[0-9]\+m//g' etc/build.usage;
			fi; exit 0; ;;
		--reset-state)	ARG_RESET_PKG=1; _shiftfl=1; ;;
		-v*)		_opt="${1#-}"; while [ -n "${_opt}" ]; do
					: $((ARG_VERBOSE+=1)); _opt="${_opt#?}";
				done; _shiftfl=1; ;;
		# {{{ --roar
		--roar)		printf "%s\n" '
                                 
                                 
%.           /\       /\    ROAR!
`%%.             """       /     
 `%%            o _ o     /      
 //        ;   (__Y__)           
((        /     `\_/             
 \\     .'\''                       
  \\   /                         
   \\/    \    | |               
    \      )___| |               
   (_____/__)))))))              '; exit 0; ;;
		# }}}
		*)		_shiftfl=0; ;;
		esac;
		if [ "${_rc}" -ne 0 ]; then
			break;
		elif [ "${_shiftfl}" -gt 0 ]; then
			shift "${_shiftfl}"; continue;
		elif getopts a:b:C:D:F:hp:Pr:RxV: _opt; then
			case "${_opt}" in
			a)	ARCH="${OPTARG}"; ;;
			b)	BUILD_KIND="${OPTARG}"; ;;
			C)	ARG_CLEAN_BUILDS="${OPTARG}"; ;;
			D)	ARG_DIST="${OPTARG}"; ;;
			F)	ARG_FETCH_FORCE="${OPTARG}"; ;;
			h)
				if [ -t 1 ]; then
					cat etc/build.usage.short;
				else
					sed 's/\[[0-9]\+m//g' etc/build.usage.short;
				fi; exit 0; ;;
			p)	ARG_PARALLEL="${OPTARG}"; ;;
			P)	ARG_PARALLEL="auto";
				if [ -n "${2:-}" ]\
				&& rtl_isnumber "${2}"; then
					_rc=1; _status="maximum parallelisation job count is set with the \`-p jobs' option."; break
				fi; ;;
			r)	ARG_RESTART="${OPTARG}"; ;;
			R)	ARG_RELAXED=1; ;;
			x)	ARG_VERBOSE_TAGS="${ARG_VERBOSE_TAGS:+${ARG_VERBOSE_TAGS},}xtrace"; ;;
			V)	ARG_VERBOSE_TAGS="${OPTARG}"; ;;
			*)	cat etc/build.usage.short; exit 1; ;;
			esac; shift $((${OPTIND}-1)); OPTIND=1;
		else	if rtl_match "${1}" "=*"; then
				BUILD_GROUPS_INHIBIT_DEPS=1; _arg="${1#=}";
			else
				_arg="${1}";
			fi;
			case "${_arg}" in
			*=*)		rtl_set_var_unsafe "${_arg%%=*}" "${_arg#*=}"; ;;
			[!a-zA-Z]*)	_rc=1; _status="build group names must start with [a-zA-Z] (in argument \`${_arg}'.)"; ;;
			*[!_a-zA-Z]*)	_rc=1; _status="build group names must not contain [!_a-zA-Z] (in argument \`${_arg}'.)"; ;;
			*)		BUILD_GROUPS="$(rtl_lconcat "${BUILD_GROUPS}" "${_arg}")"; ;;
			esac; shift;
		fi;
	done;
	if [ "${_rc:-0}" -eq 0 ]; then
		case "${ARG_PARALLEL}" in
		auto)	if ! ARG_PARALLEL="$(rtl_get_cpu_count)"; then
				_rc=1; _status="failed to get CPU count.";
			else
				ARG_PARALLEL=$((${ARG_PARALLEL}/2));
			fi; ;;
		"")	ARG_PARALLEL=1; ;;
		*)	if ! rtl_isnumber "${ARG_PARALLEL}"; then
				_rc=1; _status="invalid jobs count \`${ARG_PARALLEL}'.";
			fi; ;;
		esac;
		if [ "${_rc:-0}" -eq 0 ]; then
			DEFAULT_BUILD_CPUS="${ARG_PARALLEL}";
		fi;
	fi;
	return "${_rc}";
};

buildp_init_logging() {
	local _tag="" _tags="" _rc=0; _status="";

	rtl_log_clear_tags;
	case "${ARG_VERBOSE}" in
	0)	[ "${#ARG_VERBOSE_TAGS}" -eq 0 ] && rtl_log_enable_tags "${LOG_TAGS_normal}"; ;;
	1)	rtl_log_enable_tags "${LOG_TAGS_verbose}"; ;;
	*)	_rc=1; _status="invalid verbosity level (max. -v)"; ;;
	esac;
	if [ "${_rc}" -eq 0 ]; then
		case "${ARG_VERBOSE_TAGS}" in
		+*)	rtl_log_enable_tags "${LOG_TAGS_normal}";
			ARG_VERBOSE_TAGS="${ARG_VERBOSE_TAGS#+}"; ;;
		*)	;;
		esac;
		for _tag in $(rtl_llift "${ARG_VERBOSE_TAGS}" "," " "); do
			case "${_tag}" in
			all)		rtl_log_enable_tags "${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}"; ;;
			*)
					_tags="$(rtl_lsearch_patternl "${LOG_TAGS_all}" "${_tag}" ",")";
					if [ "${#_tags}" -gt 0 ]; then
						rtl_log_enable_tags "${_tags}";
					else
						_rc=1; _status="invalid log tag or tag pattern \`${_tag}'"; break;
					fi; ;;
			esac;
		done;
	fi;
	return "${_rc}";
};

buildp_init_prereqs() {
	if ! rtl_check_prereqs ${DEFAULT_PREREQS}; then
		printf "%s\n" "${_status}" >&2; exit 1;
	elif ! awk -V 2>/dev/null | grep -q "^GNU Awk "; then
		printf "Error: awk(1) in \$PATH must be GNU Awk." >&2; exit 1;
	elif ! (FNAME="$(mktemp)" && { trap "rm -f \"\${FNAME}\"" EXIT;	\
			sed -i'' -e '' "${FNAME}" >/dev/null 2>&1; }); then
		printf "Error: sed(1) in \${PATH} does not support the \`-i' option.\n" >&2; exit 1;
	fi;
};

build_init() {
	local _rc=0; _status="";
	if ! buildp_init_env			\
	|| ! buildp_init_getopts "${@}"		\
	|| ! buildp_init_logging		\
	|| ! ex_pkg_load_vars			\
	|| ! buildp_init_prereqs		\
	|| ! buildp_init_args			\
	|| ! buildp_init_files; then
		_rc=1; _status="${_status}";
	fi; return "${_rc}";
};

# vim:filetype=sh foldmethod=marker