#

# . ./build.vars and set -o errexit are assumed.

#

TIMESTAMP_FMT="${TIMESTAMP_FMT:-"%Y/%m/%d %H:%M:%S"}";

check_path_vars() {

	while [ $# -gt 0 ]; do

		if [ -z "${_val:=$(eval echo \${${1}})}" ]; then

			log_msg fail "Error: variable \`${1}' is empty or unset.";

			exit 1;

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

			log_msg fail "Error: variable \`${1}' contains one or more whitespace characters.";

			exit 1;

		else

			shift;

		fi;

	done; unset _val;

};

check_prereqs() {

	for _cmd in "$@"; do

		if ! command -v ${_cmd} >/dev/null; then

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

			exit 1;

		fi;

	done; unset _cmd;

};

date() {

	command date +"${1:-${TIMESTAMP_FMT}}";

};

fetch() {

	wget --no-check-certificate -N ${1};

	if [ $# -eq 2 ] && ! compare_hash ${1##*/} ${2}; then

		log_msg fail "Error: hash mismatch for URL \`${1##*/}'.";

		exit 1;

	fi;

};

fetch_git() {

	if [ -d ${1} ]; then

		(cd ${1} && git pull origin main);

	else

		git clone ${2} ${1};

	fi;

};

compare_hash() {

	_hash_cmp=${2}; set -- $(openssl dgst -sha256 ${1});

	shift $((${#}-1)); set -- ${1} ${_hash_cmp}; unset _hash_cmp;

	[ "x${1}" = "x${2}" ];

};

is_build_script_done() {

	_script_fname=${SCRIPT_FNAME##*/};

	if [ -f ${WORKDIR}/.${_script_fname%.build}.${1} ]; then

		unset script_fname;

		return 0;

	else

		unset script_fname;

		return 1;

	fi;

};

set_build_script_done() {

	_script_fname=${SCRIPT_FNAME##*/};

	_done_fname=${WORKDIR}/.${_script_fname%.build};

	while [ $# -ge 1 ]; do

		if [ "x${1#-}" != "x${1}" ]; then

			rm -f ${_done_fname}.${1#-};

		else

			touch ${_done_fname}.${1};

			log_msg info "Finished build step ${1} of build script \`${_script_fname}'.";

		fi; shift;

	done;

	unset _script_fname _done_fname;

};

log_msg() {

	_lvl=${1}; shift;

	case ${_lvl} in

		fail) printf "\033[${LOG_MSG_FAIL_COLOUR}m"; ;;

		info) printf "\033[${LOG_MSG_INFO_COLOUR}m"; ;;

		succ) printf "\033[${LOG_MSG_SUCC_COLOUR}m"; ;;

	esac;

	if [ $# -gt 1 ]; then

		printf "==> %s %s %s\033[0m\n" "$(date "${TIMESTAMP_FMT}")" "${1}" "$*";

	else

		printf "==> %s %s\033[0m\n" "$(date "${TIMESTAMP_FMT}")" "${1}";

	fi;

	unset _lvl;

};

parse_with_pkg_name() {

	PKG_NAME=${1}; shift;

	while [ $# -ge 0 ]; do

		if [ "x${PKG_NAME}" = "x${1}" ]; then

			_pkg_NAME=$(echo "${PKG_NAME}" | tr a-z A-Z);

			for _vname in							\

					configure_extra_args no_libtool_midipix		\

					patches_extra prefix prefix_extra sha256sum	\

					url version					\

					CC CFLAGS LDFLAGS DESTDIR; do

				_vNAME=$(echo "${_vname}" | tr a-z A-Z);

				if [ -n "${_vval:=$(eval echo \${PKG_${_pkg_NAME}_${_vNAME}})}" ]; then

					export PKG_${_vNAME}="${_vval}";

					if [ "x${_vname#[A-Z]}" != "x${_vname}" ]; then

						export ${_vname}="${_vval}";

					fi;

				else

					unset PKG_${_vNAME};

				fi; unset _vval;

			done; unset _pkg_NAME _vname _vNAME;

			if [ -z "${PKG_URL}" ]; then

				return 1;

			else

				PKG_FNAME=${PKG_URL##*/};

				PKG_SUBDIR=${PKG_FNAME%%.tar*};

				return 0;

			fi;

		fi; shift;

	done; return 1;

};

rm_if_exists() {

	while [ $# -gt 1 ]; do [ "x${1%[a-z]}" = "x-" ] &&\

		eval _${1#-}flag=1; shift; done;

	_dir=${1};

	if [ -d ${1} ]; then

		rm -rf ${1} || return 1;

	fi;

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

		unset _mflag; mkdir ${1} || return 2;

	fi;

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

		unset _cflag; cd ${1} || return 3;

	fi;

};

set_build_dir() {

	BUILD_DIR=${1}-${2}-${TARGET};

};

set_env_vars() {

	_val=${1}; shift;

	while [ $# -ge 1 ]; do

		export "${1}=${_val}"; shift;

	done; unset _val;

};

split() {

	_IFS="${IFS}"; IFS="${1}"; set -- ${2};

	IFS="${_IFS}"; echo "${*}"; unset _IFS;

};

# vim:filetype=sh