#!/bin/sh

# Copyright (c) 2016 Lucio Andrés Illanes Albornoz <l.illanes@gmx.de>

#

. ./build.subr;

VALID_BUILD_LEVELS="fetch,extract,build_dir,autoconf,patch,configure,clean,build,install";

#

# Process command line arguments.

while [ ${#} -gt 0 ]; do

case ${1} in

-c)	ARG_CLEAN=1; ;;

-t*)	ARG_TARBALL=1; [ "${1#-t.}" != "${1}" ] && TARBALL_SUFFIX=${1#-t.}; ;;

-x)	ARG_XTRACE=1; set -o xtrace; ;;

-a)	[ -z "${2}" ] && exec cat build.usage || ARCH="${2}"; shift; ;;

-b)	[ -z "${2}" ] && exec cat build.usage || BUILD="${2}"; shift; ;;

-i)	[ -z "${2}" ] && exec cat build.usage || insert_build_script_link "${2}"; exit; ;;

-r)	[ -n "${ARG_RESTART_SCRIPT}" ] && exec cat build.usage;

	if [ "${2#*:*}" != "${2}" ]; then

		ARG_RESTART_SCRIPT="${2%%:*}"; ARG_RESTART_SCRIPT_AT="${2##*:}";

		if [ ! -e "${ARG_RESTART_SCRIPT}" ]; then

			log_msg fail "Error: unknown build script specified.";

			exec cat build.usage;

		fi;

		if [ "${ARG_RESTART_SCRIPT_AT}" != diff ]; then

			for __ in $(split , "${ARG_RESTART_SCRIPT_AT}"); do

				if ! match_list "${VALID_BUILD_LEVELS}" , "${__}"; then

					log_msg fail "Error: unknown build level specified.";

					exec cat build.usage;

				fi;

			done;

		fi;

	else

		ARG_RESTART_SCRIPT="${2}"; ARG_RESTART_SCRIPT_AT=ALL;

	fi; shift; ;;

*=*)	set_var_unsafe "${1%%=*}" "${1#*=}"; ;;

*)	exec cat build.usage; ;;

esac; shift; done;

# Source the build variables file and its local overrides, if any.

for __ in ${HOME}/midipix_build.vars ../midipix_build.vars ./build.vars; do

	[ -e ${__} ] && . ${__};

done;

#

# Clear the environment.

# Check whether the pathnames in build.vars contain non-empty valid values.

# Check whether all prerequisite command names resolve.

# Check whether all prerequisite pathnames resolve.

for __ in $(export | sed -e 's/^export //' -e 's/=.*$//'); do

	if ! match_list "${CLEAR_ENV_VARS_EXCEPT}" " " "${__}"; then

		unset "${__}";

	fi;

done;

for __ in ${CHECK_PATH_VARS}; do

	if [ -z "${___:=$(get_var_unsafe "${__}")}" ]; then

		log_msg failexit "Error: variable \`${__}' is empty or unset.";

	elif [ "${___#* *}" != "${___}" ]; then

		log_msg failexit "Error: variable \`${__}' contains one or more whitespace characters.";

	fi;

done;

for __ in ${CHECK_PREREQ_CMDS} ${CHECK_PREREQ_FILES}; do

	if [ "${__#/}" != "${__}" ]; then

		if [ ! -e "${__}" ]; then

			log_msg fail "Error: missing prerequisite file \`${__}'.";

			__exit=1;

		fi;

	else

		if ! test_cmd "${__}"; then

			log_msg fail "Error: missing prerequisite command \`${__}'.";

			__exit=1;

		fi;

	fi;

done;

if [ ${__exit:-0} = 1 ]; then

	exit 1;

elif [ -n "${__exit}" ]; then

	unset __exit;

fi;

# Clean ${PREFIX} if requested.

if [ ${ARG_CLEAN:-0} -eq 1 ]; then

	log_msg info "-c specified, cleaning prefix...";

	for __ in ${CLEAR_PREFIX_DIRS}; do

		if [ -e ${PREFIX}/${__} ]; then

			rm -rf -- ${PREFIX}/${__};

		fi;

	done;

fi;

# Create directory hierarchy and usr -> . symlinks.

mkdir -p -- ${PREFIX} ${PREFIX_NATIVE} ${PREFIX_CROSS} ${PREFIX_TARGET}/lib ${DLCACHEDIR} ${WORKDIR};

for __ in ${PREFIX}/usr ${PREFIX_NATIVE}/usr; do

	if [ ! -L "${__}" ]; then

		rm -rf -- "${__}"; ln -sf -- . "${__}";

	fi;

done;

if [ -e ${BUILD_LOG_FNAME} ]; then

	mv -- ${BUILD_LOG_FNAME} ${BUILD_LOG_LAST_FNAME};

fi;

touch ${BUILD_STATUS_IN_PROGRESS_FNAME};

trap "rm -f ${BUILD_STATUS_IN_PROGRESS_FNAME}; log_msg failexit \"Build aborted.\"" HUP INT TERM USR1 USR2;

{(

trap "rm -f ${BUILD_STATUS_IN_PROGRESS_FNAME}; log_msg failexit \"Build aborted.\"" HUP INT TERM USR1 USR2;

BUILD_DATE_START="$(date %Y-%m-%d-%H-%M-%S)";

BUILD_NFINI=${BUILD_NSKIP:=${BUILD_NFAIL:=${BUILD_NBUILT:=0}}};

BUILD_TIMES_SECS=$(command date +%s);

log_msg info "Build started by ${BUILD_USER:=${USER}}@${BUILD_HNAME:=$(hostname)} at ${BUILD_DATE_START}.";

log_env_vars "build (global)" ${LOG_ENV_VARS};

for BUILD_LVL in 0 1 2 3 ${ARG_TARBALL:+9}; do

	for BUILD_SCRIPT_FNAME in ${BUILD_LVL}[0-9][0-9].*.build; do

		if [ -n "${ARG_RESTART_SCRIPT}" ]					\

		&& [ "${ARG_RESTART_SCRIPT}" != "ALL" ]					\

		&& [ "${ARG_RESTART_SCRIPT}" != ${BUILD_SCRIPT_FNAME} ]; then

			if [ ${ARG_XTRACE:-0} -eq 0 ]; then

				log_msg info "Skipped build script \`${BUILD_SCRIPT_FNAME}' (--build-scripts policy.)";

			fi;

			continue;

		elif [ ! -f "${BUILD_SCRIPT_FNAME}" ]; then

			log_msg info "Build script \`${BUILD_SCRIPT_FNAME}' non-existent or not a file.";

			continue;

		else

			unset BUILD_SCRIPT_RC; : $((BUILD_NBUILT+=1));

			if [ "${ARG_RESTART_SCRIPT}" != ALL ]\

			&& is_build_script_done finish "${BUILD_SCRIPT_FNAME%.build}"; then

				log_msg info "Skipped build script \`${BUILD_SCRIPT_FNAME}' (already built.)";

					: $((BUILD_NSKIP+=1)); BUILD_SCRIPT_RC=0; continue;

			fi;

			log_msg info "Invoking build script${ARG_RESTART_SCRIPT:+ (forcibly)} \`${BUILD_SCRIPT_FNAME}'${ARG_RESTART_SCRIPT_AT:+ at build step ${ARG_RESTART_SCRIPT_AT}}.";

			(set -o errexit -o noglob;					\

			 set -- $(split . ${BUILD_SCRIPT_FNAME%%.build*});		\

			 SCRIPT_FNAME=${BUILD_SCRIPT_FNAME};				\

			 SCRIPT_NAME=${SCRIPT_FNAME%%.build*};				\

			 export PKG_BUILD=${BUILD};					\

			 export PKG_TARGET=${TARGET};					\

			 export PKG_PREFIX=$(get_var_unsafe PKG_LVL${BUILD_LVL}_PREFIX);\

			 export MIDIPIX_BUILD_PWD=$(pwd); cd ${WORKDIR};		\

			 for SCRIPT_SOURCE in build.subr ${SCRIPT_NAME}.vars		\

					${BUILD_SCRIPT_FNAME}; do			\

			 	[ -f ${MIDIPIX_BUILD_PWD}/${SCRIPT_SOURCE} ] &&		\

					 . ${MIDIPIX_BUILD_PWD}/${SCRIPT_SOURCE};	\

			 done);

			case ${BUILD_SCRIPT_RC:=${?}} in

			0) log_msg succ "Finished build script \`${BUILD_SCRIPT_FNAME}'.";

				: $((BUILD_NFINI+=1)); continue; ;;

			*) log_msg fail "Build failed in build script \`${BUILD_SCRIPT_FNAME}' (last return code ${BUILD_SCRIPT_RC}.).";

				: $((BUILD_NFAIL+=1)); break; ;;

			esac;

		fi;

	done;

	if [ ${BUILD_SCRIPT_RC:-0} -ne 0 ]; then

		break;

	fi;

done;

log_msg info "${BUILD_NFINI} finished, ${BUILD_NSKIP} skipped, and ${BUILD_NFAIL} failed builds in ${BUILD_NBUILT} build script(s).";

: $((BUILD_TIMES_SECS=$(command date +%s)-${BUILD_TIMES_SECS}));

: $((BUILD_TIMES_HOURS=${BUILD_TIMES_SECS}/3600));

: $((BUILD_TIMES_MINUTES=(${BUILD_TIMES_SECS}%3600)/60));

: $((BUILD_TIMES_SECS=(${BUILD_TIMES_SECS}%3600)%60));

log_msg info "Build time: ${BUILD_TIMES_HOURS} hour(s), ${BUILD_TIMES_MINUTES} minute(s), and ${BUILD_TIMES_SECS} second(s).";

if [ -f "${BUILD_STATUS_IN_PROGRESS_FNAME}" ]; then

	rm -f -- ${BUILD_STATUS_IN_PROGRESS_FNAME};

fi;

exit ${BUILD_SCRIPT_RC})} 2>&1 | tee ${BUILD_LOG_FNAME} &

trap "kill -INT $!" HUP INT TERM USR1 USR2; wait;

# vim:filetype=sh