#
# . ./build.vars and set -o errexit -o noglob are assumed.
# See warning at the top of build.vars.
#

date() { command date +"${1:-${TIMESTAMP_FMT}}"; };
get_var_unsafe() { eval echo \${${1}}; };
set_var_unsafe() { eval ${1}=\"${2}\"; };
push_IFS() { _pI_IFS="${IFS}"; IFS="${1}"; };
pop_IFS() { IFS="${_pI_IFS}"; unset _pI_IFS; };
set_build_dir() { PKG_BUILD_DIR=${1}-${2}-${TARGET}; };
split() { push_IFS "${1}"; set -- ${2}; pop_IFS; echo "${*}"; };
test_cmd() { command -v "${1}" >/dev/null; };
unsplit() { push_IFS "${1}"; shift; set -- "${@}"; echo "${*}"; pop_IFS; };

get_vars_unsafe() {
	while [ ${#} -gt 0 ]; do
		_gvu_vval="$(eval echo \${${1}})";
		[ -z "${_gvu_vval}" ] || _gvu_vval_="${_gvu_vval}";
		shift;
	done; echo "${_gvu_vval_}";
	unset _gvu_vval _gvu_vval_;
};

log_msg() {
	_lm_lvl=${1}; shift;
	if [ "${_lm_lvl#v}" != "${_lm_lvl}" ]\
	&& [ ${ARG_VERBOSE:-0} -eq 0 ]; then
		return;
	fi;
	case ${_lm_lvl} in
		failexit) printf "\033[0m\033[${LOG_MSG_FAIL_COLOUR}m"; ;;
		fail) printf "\033[0m\033[${LOG_MSG_FAIL_COLOUR}m"; ;;
		info) printf "\033[0m\033[${LOG_MSG_INFO_COLOUR}m"; ;;
		vnfo) printf "\033[0m\033[${LOG_MSG_INFO_COLOUR}m"; ;;
		succ) printf "\033[0m\033[${LOG_MSG_SUCC_COLOUR}m"; ;;
		warn) printf "\033[0m\033[${LOG_MSG_WARN_COLOUR}m"; ;;
		varn) printf "\033[0m\033[${LOG_MSG_WARN_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; [ ${_lm_lvl} = failexit ] && exit 1 || unset _lm_lvl;
};

insecure_mkdir() {
	while [ ${#} -gt 0 ]; do
		if [ -z "${1}" ]; then
			return 1;
		elif [ ! -e "${1}" ]; then
			log_msg varn "Making directory \`${1}'.";
			mkdir -p -- "${1}";
		fi; shift;
	done;
};

match_list() {
	_ml_cmp="${3}"; push_IFS "${2}"; set -- ${1}; pop_IFS;
	while [ ${#} -gt 0 ]; do
		if [ "${1}" = "${_ml_cmp}" ]; then
			unset _ml_cmp; return 0;
		fi; shift;
	done; unset _ml_cmp; return 1;
};

secure_cd() {
	if [ \( -z "${1}" \) -o \( ! -e "${1}" \) ]; then
		return 1;
	else
		(cd "${1}"; [ "${PWD#${PREFIX_ROOT}}" = "${PWD}" ] &&\
			return 1 || return 0);
		if [ ${?} -eq 0 ]; then
			log_msg varn "Changing working directory to \`${1}'.";
			cd -- "${1}";
		else
			log_msg failexit "secure_cd() called with pathname \`${1}' not below \${PREFIX_ROOT} (${PREFIX_ROOT}). This is a bug.";
		fi;
	fi;
};

secure_rm() {
	while [ ${#} -gt 0 ]; do
		if [ -z "${1}" ]; then
			return 1;
		elif [ -e "${1}" ]; then
			if [ -d "${1}" ]; then
				_sr_pname_check="${1}";
			else
				_sr_pname_check="$(dirname "${1}")";
			fi;
			(cd "${_sr_pname_check}"; [ "${PWD#${PREFIX_ROOT}}" = "${PWD}" ] &&\
				return 1 || return 0);
			if [ ${?} -eq 0 ]; then
				unset _sr_pname_check;
				log_msg varn "Removing directory or file \`${1}'.";
				rm -rf -- "${1}";
			else
				log_msg failexit "secure_rm() called with pathname \`${1}' not below \${PREFIX_ROOT} (${PREFIX_ROOT}). This is a bug.";
			fi;
		fi; shift;
	done;
};

# vim:filetype=sh