#

# set -o errexit is assumed.

#

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

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 +"${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[91m"; ;;

		info) printf "\033[97m"; ;;

		succ) printf "\033[92m"; ;;

	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

		_pkg_url=${1}; _envvs="${2}"; _pkg_fname=${_pkg_url##*/};

		if [ "x${_pkg_fname%%-*}" = "x${_pkg_name}" ]; then

			_IFS="${IFS}"; IFS=:;

			for _envv in ${_envvs}; do

				export ${_envv};

			done; IFS="${_IFS}"; unset _envvs _envv;

			_pkg_subdir=${_pkg_fname%%.tar*};

			eval _pkg_sha256sum=\${PKG_$(echo "${_pkg_name}" |\

				tr a-z A-Z)_SHA256SUM};

			return;

		fi; shift 2;

	done;

	unset _pkg_name _pkg_url _envvs _pkg_fname _envv _IFS _pkg_subdir;

};

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;

};

run_configure_with_extra_args() {

	_IFS="${IFS}"; IFS=","; _script=${1}; _extra_args="${2}";

	shift 2; ${_script} "${@}" ${_extra_args}; IFS="${_IFS}";

	unset _script _extra_args;

};

set_build_dir() {

	export _build_dir=${1}-build-${2};

};

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