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#! /bin/sh

set -e

OPK_SOURCE="$(sed 's/ .*//; q;' changelog)"
BASE_VERSION="${OPK_SOURCE#gcc-}"
TPL_PKGS='cpp gcc g++'

main()
{
	case "${1}" in
		clean)
			clean
			;;
		*)
			if [ -z "${PKG_TARGETS}" ]; then
				PKG_TARGETS="$(cat targets.in)"
			fi
			for arch in ${PKG_TARGETS}; do
				PKG_TARGET_ARCH="${arch}" configure_build
			done
			>targets.mk
			printf 'targets =' >>targets.mk
			for arch in ${PKG_TARGETS}; do
				printf ' \\\n\t%s' "${arch}" >>targets.mk
			done
			printf '\n' >>targets.mk
			;;
	esac
}

msg()
{
	printf "${OPK_SOURCE} config: "
	printf "${@}"
	printf '\n'
}

configure_build()
{
	# Generate a sed script to edit files.
	_ss=
	for _name in TARGET_ARCH; do
		_ss="${_ss}s&@PKG_${_name}@&$(eval echo \$\{PKG_${_name}\})&;"
	done

	# Write metadata for <pkgbase>-<target> packages.
	for _pkg in ${TPL_PKGS}; do
		_out_pkg="${_pkg}-${BASE_VERSION}-${PKG_TARGET_ARCH}"
		mkdir -p "${_out_pkg}.pkg"
		sed "${_ss}" "${_pkg}.pkg.in/control" >"${_out_pkg}.pkg/control"
		cp "${_pkg}.pkg.in/files" "${_out_pkg}.pkg/files"
		msg 'Metadata for package "%s" generated.' "${_out_pkg}"
	done
}

clean()
{
	# Remove generated metadata for <pkgbase>-<target> packages.
	for _pkg in ${TPL_PKGS}; do
		rm -Rf "${_pkg}-${BASE_VERSION}"-*-*-*.pkg/
	done
}

main "${@}"