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#
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# . ./build.vars and set -o errexit are assumed.
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#
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TIMESTAMP_FMT="${TIMESTAMP_FMT:-"%Y/%m/%d %H:%M:%S"}";
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check_path_vars() {
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	while [ $# -gt 0 ]; do
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		if [ -z "${_val:=$(eval echo \${${1}})}" ]; then
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			log_msg fail "Error: variable \`${1}' is empty or unset.";
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			exit 1;
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		elif [ "x${_val#* }" != "x${_val}" ]; then
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			log_msg fail "Error: variable \`${1}' contains one or more whitespace characters.";
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			exit 1;
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		else
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			shift;
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		fi;
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	done; unset _val;
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};
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check_prereqs() {
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	for _cmd in "$@"; do
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		if ! command -v ${_cmd} >/dev/null; then
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			log_msg fail "Error: missing prerequisite command \`${_cmd}.";
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			exit 1;
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		fi;
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	done; unset _cmd;
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};
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date() {
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	command date +"${1:-${TIMESTAMP_FMT}}";
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};
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fetch() {
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	wget --no-check-certificate -N ${1};
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	if [ $# -eq 2 ] && ! compare_hash ${1##*/} ${2}; then
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		log_msg fail "Error: hash mismatch for URL \`${1##*/}'.";
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		exit 1;
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	fi;
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};
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fetch_git() {
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	if [ -d ${1} ]; then
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		(cd ${1} && git pull origin main);
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	else
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		git clone ${2} ${1};
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	fi;
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};
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compare_hash() {
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	_hash_cmp=${2}; set -- $(openssl dgst -sha256 ${1});
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	shift $((${#}-1)); set -- ${1} ${_hash_cmp}; unset _hash_cmp;
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	[ "x${1}" = "x${2}" ];
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};
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is_build_script_done() {
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	_script_fname=${SCRIPT_FNAME##*/};
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	if [ -f ${WORKDIR}/.${_script_fname%.build}.${1} ]; then
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		unset script_fname;
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		return 0;
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	else
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		unset script_fname;
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		return 1;
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	fi;
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};
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set_build_script_done() {
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	_script_fname=${SCRIPT_FNAME##*/};
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	_done_fname=${WORKDIR}/.${_script_fname%.build};
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	while [ $# -ge 1 ]; do
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		if [ "x${1#-}" != "x${1}" ]; then
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			rm -f ${_done_fname}.${1#-};
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		else
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			touch ${_done_fname}.${1};
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			log_msg info "Finished build step ${1} of build script \`${_script_fname}'.";
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		fi; shift;
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	done;
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	unset _script_fname _done_fname;
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};
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log_msg() {
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	_lvl=${1}; shift;
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	case ${_lvl} in
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		fail) printf "\033[${LOG_MSG_FAIL_COLOUR}m"; ;;
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		info) printf "\033[${LOG_MSG_INFO_COLOUR}m"; ;;
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		succ) printf "\033[${LOG_MSG_SUCC_COLOUR}m"; ;;
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	esac;
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	if [ $# -gt 1 ]; then
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		printf "==> %s %s %s\033[0m\n" "$(date "${TIMESTAMP_FMT}")" "${1}" "$*";
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	else
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		printf "==> %s %s\033[0m\n" "$(date "${TIMESTAMP_FMT}")" "${1}";
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	fi;
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	unset _lvl;
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};
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parse_with_pkg_name() {
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	PKG_NAME=${1}; shift;
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	while [ $# -ge 0 ]; do
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		if [ "x${PKG_NAME}" = "x${1}" ]; then
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			_pkg_NAME=$(echo "${PKG_NAME}" | tr a-z A-Z);
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			for _vname in							\
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					configure_extra_args no_libtool_midipix		\
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					patches_extra prefix prefix_extra sha256sum	\
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					url version					\
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					CC CFLAGS LDFLAGS DESTDIR; do
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				_vNAME=$(echo "${_vname}" | tr a-z A-Z);
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				if [ -n "${_vval:=$(eval echo \${PKG_${_pkg_NAME}_${_vNAME}})}" ]; then
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					export PKG_${_vNAME}="${_vval}";
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					if [ "x${_vname#[A-Z]}" != "x${_vname}" ]; then
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						export ${_vname}="${_vval}";
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					fi;
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				else
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					unset PKG_${_vNAME};
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				fi; unset _vval;
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			done; unset _pkg_NAME _vname _vNAME;
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			if [ -z "${PKG_URL}" ]; then
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				return 1;
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			else
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				PKG_FNAME=${PKG_URL##*/};
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				PKG_SUBDIR=${PKG_FNAME%%.tar*};
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				return 0;
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			fi;
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		fi; shift;
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	done; return 1;
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};
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rm_if_exists() {
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	while [ $# -gt 1 ]; do [ "x${1%[a-z]}" = "x-" ] &&\
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		eval _${1#-}flag=1; shift; done;
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	_dir=${1};
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	if [ -d ${1} ]; then
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		rm -rf ${1} || return 1;
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	fi;
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	if [ ${_mflag:-0} -eq 1 ]; then
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		unset _mflag; mkdir ${1} || return 2;
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	fi;
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	if [ ${_cflag:-0} -eq 1 ]; then
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		unset _cflag; cd ${1} || return 3;
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	fi;
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};
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set_build_dir() {
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	BUILD_DIR=${1}-${2}-${TARGET};
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};
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set_env_vars() {
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	_val=${1}; shift;
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	while [ $# -ge 1 ]; do
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		export "${1}=${_val}"; shift;
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	done; unset _val;
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};
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split() {
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	_IFS="${IFS}"; IFS="${1}"; set -- ${2};
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	IFS="${_IFS}"; echo "${*}"; unset _IFS;
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};
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# vim:filetype=sh