geninteg

#!/bin/sh
NAME=$(basename ${0:-geninteg})

_echo2(){
	>&2 echo $@
}

_options(){
	# out
	args=()
	makepkgconfig=""
	inplace=0
	usage=0
	# flags
	i=0
	confarg=0

	for arg in $@;
	do
		case ${arg} in
			--config=*)
				makepkgconfig="${arg#--config=}"
				;;
			--config)
				confarg=1
				;;
			--inplace)
				inplace=1
				;;
			-h|--help)
				usage=1
				;;
			*)
				if test ${confarg} -eq 1;
				then
					confarg=0
					makepkgconfig="$(realpath ${arg})"
				else
					args[$i]="${arg}"
					i=$(( $i + 1 ))
				fi
				;;
		esac
	done

	export args
	export usage
	export inplace
	export makepkgconfig
}

_usage(){
	>&2 cat <<EOF
Usage: ${NAME} [options] <PKGBUILD>

An help script to generate source=()'s checkums from a PKGBUILD
template. The script will jump to the same directory of <PKGBUILD>.

Options:"
  --config    <makepkg.conf> # pass this configuration to makepkg;
  --inplace                  # update <PKGBUILD> inplace;
  --help|-h                  # print this message.
EOF

	exit 2
}

main(){
	_options $@

	if test ${usage} -eq 1 -o ${#args[@]} != 1;
	then
		_usage
	fi

	pkgbuild="$(realpath ${args[0]})"
	workingdir="$(dirname ${pkgbuild})"

	_echo2 "# makepkg.conf(${makepkgconfig:-default}); workding-dir(${workingdir:-.})"

	if test -n "${makepkgconfig}";
	then
		makepkgconfig="--config ${makepkgconfig}"
	fi

	if test -n "${workingdir}";
	then
		>&2 cd -- "${workingdir}" || exit 1
	fi

	if test ${inplace} -eq 1;
	then
		inplace="-i~"
	else
		inplace=""
	fi

	if ! $(grep -q -s -e "^#sums=$" -- ${pkgbuild});
	then
		_echo2 "Not a PKGBUILD template: ${pkgbuild}"
		exit 1
	fi

	sums=$(makepkg ${makepkgconfig} -p "${pkgbuild}" -g)

	if test -z "${sums}";
	then
		_echo2 "No checksums to compute"
		exit 1
	fi

	sed ${inplace} "s:#sums=:${sums}:" "${pkgbuild}"
}

main $@