#! /bin/sh
#
# opkbuild
# testsetup
# Generates configuration and data files to test opkbuild.
#
# Copyright (C) 2012 Patrick "P. J." McDermott
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

prefix=''
datadir=''
sysconfdir=''

long_opts_with_args='
prefix
datadir
sysconfdir
'

main()
{
	parse_options "${@}"
	shift ${optind}

	[ -z "${prefix}" ] && prefix='/usr/local'
	[ -z "${datadir}" ] && datadir="${prefix}/share"
	[ -z "${sysconfdir}" ] && sysconfdir='/etc'

	if [ ${#} -ne 2 ]; then
		print_usage
		exit 1
	fi

	build_arch="${1}"
	build_plat="${2}"

	printf 'Generating build system configuration...\n'
	mkdir -p "${sysconfdir}" || \
		error 'Cannot make system configuration directory'
	echo "${build_arch}" >"${sysconfdir}/proteanos_arch" || \
		error 'Cannot write proteanos_arch'
	echo "${build_plat}" >"${sysconfdir}/proteanos_plat" || \
		error 'Cannot write proteanos_plat'

	printf 'Generating distribution architecture data...\n'
	mkdir -p "${datadir}/opkbuild/archtab" || \
		error 'Cannot make architecture table directory'
	printf 'x86_64-unknown-linux-gnu\nx86, i386\n' \
		>"${datadir}/opkbuild/archtab/core-linux-eglibc" || \
		error 'Cannot write architecture data'
	printf 'i686-unknown-linux-gnu\nx86, i386\n' \
		>"${datadir}/opkbuild/archtab/i686-linux-eglibc" || \
		error 'Cannot write architecture data'
	printf 'i686-unknown-freebsd9.0\nx86, i386\n' \
		>"${datadir}/opkbuild/archtab/i686-kfreebsd-eglibc" || \
		error 'Cannot write architecture data'
	printf 'arm-cortex_a8-linux-gnueabi\narm\n' \
		>"${datadir}/opkbuild/archtab/cortexa8-linux-eglibc" || \
		error 'Cannot write architecture data'

	printf 'Done!\n'
}

print_usage()
{
	printf 'Usage: %s [OPTION]... build-arch build-plat\n' "${0}"
}

parse_options()
{
	optind=0

	for _opt; do

		# Handle arguments of "--opt arg" options.
		if [ -n "${_prev}" ]; then
			eval "${_prev}"=\"\$\{_opt\}\"
			_prev=''
			continue
		fi

		# Detect "--opt=arg" and "--opt arg" options.
		case "${_opt}" in
			*=*)
				_optarg="${_opt#*=}"
				_opt="${_opt%=*}"
				_optarg_set='true'
				;;
			*)
				_optarg_set='false'
				;;
		esac

		# Handle short and long options.
		case "${_opt}" in
			--)
				break
				;;
		esac

		# Anything beyond this point should be a long option.
		case "${_opt}" in
			--*)
				_opt="${_opt#--}"
				_opts="${long_opts_with_args}"
				_type='option'
				;;
			*)
				break
				;;
		esac

		grep "^${_opt}\$" >/dev/null 2>&1 <<EOF
"${_opts}"
EOF
		if [ ${?} -ne 0 ]; then
			printf 'invalid %s name: %s\n' "${_type}" "${_opt}" >&2
			exit 1
		fi
		if ${_optarg_set}; then
			_opt="$(printf '%s' "${_opt}" | tr -c '[a-z0-9]' '_')"
			eval "${_opt}"=\"\$\{_optarg\}\"
		else
			_prev="${_opt}"
		fi

		optind=$(($optind + 1))

	done
}

error()
{
	printf '%s: Error: ' "${0##*/}"
	printf "${@}"
	printf '\n'
	exit 1
}

main "${@}"