#

# set -o errexit -o noglob are assumed.

#

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

get_var_unsafe() { eval echo \${${1}}; };

set_var_unsafe() { [ -n "${2}" ] && eval ${1}=\"${2}\" || return 0; };

pop_IFS() { IFS="${_pI_IFS}"; unset _pI_IFS; };

push_IFS() { _pI_IFS="${IFS}"; IFS="${1}"; };

set_build_dir() { PKG_BUILD_DIR="${1}-${2}-${PKG_TARGET}"; };

test_cmd() { command -v "${1}" >/dev/null; };

build_fileop() {

	local _op="${1}"; shift;

	if [ "${_op}" = cd ]; then

		log_msg varn "Changing working directory to \`${1}'.";

		[ \( -n "${1}" \) -a \( -e "${1}" \) ] && cd -- "${1}";

	elif [ "${_op}" = cp ]; then

		log_msg varn "Copying \`${1}' to \`${2}' w/ -pPR.";

		[ ${#} -ge 2 ] && cp -pPR -- "${@}";

	elif [ "${_op}" = ln_symbolic ]; then

		log_msg varn "Linking \`${1}' to \`${2}' w/ -fs";

		[ \( -n "${1}" \) -a \( -n "${2}" \) ] && ln -fs -- "${1}" "${2}";

	elif [ "${_op}" = mv ]; then

		log_msg varn "Moving \`${1}' to \`${2}' w/ -fs";

		[ \( -n "${1}" \) -a \( -n "${2}" \) ] && mv -f -- "${1}" "${2}";

	elif [ "${_op}" = mkdir ]\

	||   [ "${_op}" = rm ]; then

		while [ ${#} -gt 0 ]; do

			if [ -z "${1}" ]; then

				return 1;

			elif [ "${_op}" = mkdir ]\

			&&   [ ! -e "${1}" ]; then

				log_msg varn "Making directory \`${1}'.";

				mkdir -p -- "${1}";

			elif [ "${_op}" = rm ]\

			&&   [ -e "${1}" ]; then

				log_msg varn "Removing directory or file \`${1}'.";

				rm -rf -- "${1}";

			fi; shift;

		done;

	else

		log_msg failexit "Error: build_fileop() called w/ invalid parameter(s) \`${@}'.";

	fi;

};

install_files() {

	local _verbose _prefix _ln_target _ln_fname _mkdir_fname	\

		_file_fname_src _file_fname_dst;

	if [ "${1}" = "-v" ]; then

		_verbose="${1}"; shift;

	fi; _prefix="${1}"; shift;

	while [ ${#} -gt 0 ]; do

	case "${1}" in

	@*=*)

		_ln_target="${1%=*}";

		_ln_target="${_ln_target#@}";

		_ln_fname="${1#*=}";

		if [ -e "${_ln_fname}" ]; then

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

				echo build_fileop rm "${_ln_fname}";

			fi;

			build_fileop rm "${_ln_fname}";

		fi;

		build_fileop ln_symbolic "${_ln_target}" "${_prefix:+${_prefix}/}${_ln_fname}";

		;;

	/=*)

		_mkdir_fname="${1#/=}";

		build_fileop mkdir "${_prefix:+${_prefix}/}${_mkdir_fname}";

		;;

	*)

		_file_fname_src="${1%=*}";

		_file_fname_dst="${1#*=}";

		build_fileop cp "${_file_fname_src}" "${_prefix:+${_prefix}/}${_file_fname_dst}";

		;;

	esac; shift;

	done;

};

is_build_script_done() {

	local _done_fname="${WORKDIR}/.${1}.${2}" _restart_at="${3}";

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

		if [ -e "${_done_fname}" ]; then

			return 0;	# Skip

		else

			return 1;	# Build

		fi;

	elif lmatch "${_restart_at}" , "${2}"; then

		return 1;		# Build

	else

		return 0;		# Skip

	fi;

};

set_build_script_done() {

	local _pkg_fname="${1}";

	local _done_fname_pfx="${WORKDIR}/.${_pkg_fname}";

	shift; while [ ${#} -ge 1 ]; do

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

			build_fileop rm "${_done_fname_pfx}.${1#-}";

		else

			touch "${_done_fname_pfx}.${1}";

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

		fi; shift;

	done;

};

lfilter() {

	local _list="${1}" _filter="${2}" _lnew _litem _lfilter;

	for _litem in ${_list}; do

		for _lfilter in ${_filter}; do

			if [ "${_lfilter}" = "${_litem}" ]; then

				_lnew="${_lnew:+${_lnew} }${_litem}"; break;

			fi; 

		done;

	done;

	echo ${_lnew};

};

lmatch() {

	local _cmp="${3}"; push_IFS "${2}"; set -- ${1}; pop_IFS;

	while [ ${#} -gt 0 ]; do

		if [ "${1}" = "${_cmp}" ]; then

			return 0;

		fi; shift;

	done; return 1;

};

log_env_vars() {

	local _nvar _arg _arg_len_max;

	log_msg info "Variables for this ${1:-build}:"; shift;

	while [ ${_nvar:=0} -lt ${#} ]; do

		_arg="$(eval echo \${${_nvar}})";

		_arg="${_arg%%=*}";

		if [ ${#_arg} -gt ${_arg_len_max:=0} ]; then

			_arg_len_max=${#_arg};

		fi; : $((_nvar+=1));

	done;

	while [ ${#} -gt 0 ]; do

		log_msg info "$(printf					\

			"%${_arg_len_max}.${_arg_len_max}s=%s"	\

			"${1%%=*}" "$(get_var_unsafe ${1#*=})")";

		shift;

	done;

};

log_msg() {

	local _lvl="${1}"; shift;

	if [ "${_lvl#v}" != "${_lvl}" ]\

	&& [ ${ARG_VERBOSE:-0} -eq 0 ]; then

		return;

	fi;

	case "${_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" "$(date)" "${1}" "$*";

	else

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

	fi; [ ${_lvl} = failexit ] && exit 1 || return 0;

};

run_cmd_unsplit() {

	local _cmd="${1}" _cmdline _rc; shift;

	while [ ${#} -gt 0 ]; do

		[ -n "${1}" ] &&\

			_cmdline="${_cmdline:+${_cmdline}:}${1}";

		shift;

	done;

	push_IFS :; ${_cmd} ${_cmdline}; _rc=$?; pop_IFS;

	return ${_rc};

};

set_env_vars_with_sep() {

	local _sep="${1}"; shift; push_IFS ${_sep}; set -- ${1};

	while [ ${#} -gt 0 ]; do

		export "${1}"; shift;

	done; pop_IFS;

};

subst_tgts() {

	while [ ${#} -ge 1 ]; do

	case "${1}" in

	devroot)

		echo "${DEVROOT_PACKAGES}"; ;;

	world)	echo "${WORLD_PACKAGES}"; ;;

	*)	echo "${1}"; ;;

	esac; shift;

	done;

};

# vim:filetype=sh