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 [ $# -eq 2 ]\
	&& ! printf "${2} ${1##*/}\n" | sha256sum -c --status; then
		log_msg fail "Error: sha256sum mismatch for URL \`${1##*/}'.";
		exit 1;
	fi;
};

fetch_git() {
	if [ -d "${1}" ]; then
		(cd "${1}" && git pull origin main);
	else
		git clone "${2}" "${1}";
	fi;
};

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