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# Interface for retrieving source and binary package metadata
#
# Copyright (C) 2012 Patrick McDermott
#
# This file is part of opkbuild.
#
# opkbuild 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 3 of the License, or
# (at your option) any later version.
#
# opkbuild 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 opkbuild.  If not, see <http://www.gnu.org/licenses/>.

_OB_PACKAGE_DIR=
_OB_PACKAGE_FORMAT=
_OB_BINARY_PACKAGES=
_OB_SOURCE_PARAMETERS=
_OB_BINARY_PARAMETERS=

ob_init_package()
{
	local dir=

	if [ ${#} -eq 1 ]; then
		dir="${1}"
	else
		return 125
	fi

	_OB_PACKAGE_DIR="$(cd "${dir}" && pwd)"

	if [ -r "${_OB_PACKAGE_DIR}/format" ]; then
		case "$(cat "${_OB_PACKAGE_DIR}/format")" in
			2.0)
				_OB_PACKAGE_FORMAT='2'
				;;
		esac
	fi

	if [ -z "${_OB_PACKAGE_FORMAT}" ]; then
		_ob_warn_msg 'unable_to_detect_package_format'
		return 1
	fi

	_OB_BINARY_PACKAGES=

	return 0
}

_ob_package_do()
{
	local func=

	func="${1}"
	shift 1

	"_ob_${func}_${_OB_PACKAGE_FORMAT}" "${@}"

	return ${?}
}

ob_parse_package_metadata()
{
	local opt=
	local cache_file=
	local pkg=
	local pkg_clean=
	local param_name=
	local param_value=

	OPTIND=1
	while getopts 'c:' opt; do
		case "${opt}" in
			c)
				cache_file="${OPTARG}"
				;;
			?)
				return 125
				;;
		esac
	done
	shift $(($OPTIND - 1))

	if [ ${#} -gt 0 ]; then
		return 125
	fi

	# Load a previously saved cache file, if any.
	if [ -n "${cache_file}" -a -r "${cache_file}" ]; then
		if [ "${cache_file#*/}" != "${cache_file}" ]; then
			. "${cache_file}"
		else
			. "./${cache_file}"
		fi
		return 0
	fi

	_ob_package_do 'parse_package_metadata'

	if [ -n "${cache_file}" ]; then
		>"${cache_file}"
		for param_name in ${_OB_SOURCE_PARAMETERS}; do
			param_value="$(ob_get_source_parameter \
				"${param_name}" | sed "s/'/'\\\\''/g")"
			printf "%s='%s'\n" \
				"_OB_SRCFIELD_${param_name}" "${param_value}" \
				>>"${cache_file}"
		done
		for pkg in $(ob_get_binary_packages); do
			pkg_clean="$(echo "${pkg}" | tr 'a-z' 'A-Z' | \
				tr -dC 'A-Z0-9')"
			for param_name in ${_OB_BINARY_PARAMETERS}; do
				param_value="$(ob_get_binary_parameter "${pkg}" \
					"${param_name}" | sed "s/'/'\\\\''/g")"
				printf "%s='%s'\n" \
					"_OB_BINFIELD_${pkg_clean}_${param_name}" \
					"${param_value}" \
					>>"${cache_file}"
			done
		done
	fi

	return 0
}

ob_get_binary_packages()
{
	local opt=
	local host_arch=
	local host_plat=
	local pkgs=
	local pkg=
	local pkgs_clean=
	local pkg_clean=

	OPTIND=1
	while getopts 'a:P:' opt; do
		case "${opt}" in
			a)
				host_arch="${OPTARG}"
				;;
			P)
				host_plat="${OPTARG}"
				;;
			?)
				return 125
				;;
		esac
	done
	shift $(($OPTIND - 1))

	if [ ${#} -gt 0 ]; then
		return 125
	fi

	# NB: If a source package lists no binary packages, this will be true each
	# call.
	if [ -z "${_OB_BINARY_PACKAGES}" ]; then

		_ob_package_do 'get_binary_packages'

		pkgs_clean=' '

		for pkg in ${_OB_BINARY_PACKAGES}; do

			# Validate the name.
			if ! ob_validate_binary_name "${pkg}"; then
				_ob_warn_msg 'bad_binary_name' "${pkg}"
				continue
			fi

			# Make sure the "clean" name is unique.
			pkg_clean=" $(echo "${pkg}" | tr 'a-z' 'A-Z' | \
				tr -dC 'A-Z0-9') "
			if echo "${pkgs_clean}" | grep "${pkg_clean}" \
					>/dev/null 2>&1; then
			_ob_warn_msg 'duplicate_clean_binary_name' \
				"${pkg_clean}"
				continue
			else
				pkgs_clean="${pkgs_clean}${pkg_clean} "
			fi

			pkgs="${pkgs} ${pkg}"

		done

		_OB_BINARY_PACKAGES="$(IFS=' ' echo ${pkgs})"

	fi

	pkgs=''

	for pkg in ${_OB_BINARY_PACKAGES}; do
		if [ -n "${host_arch}" ] && ! ob_arch_is_concerned \
				"${host_arch}" "$(ob_get_binary_parameter \
				"${pkg}" 'Architecture')"; then
			continue
		fi
		if [ -n "${host_plat}" ] && ! ob_plat_is_concerned \
				"${host_plat}" "$(ob_get_binary_parameter \
				"${pkg}" 'Platform')"; then
			continue
		fi
		pkgs="${pkgs} ${pkg}"
	done

	printf '%s ' ${pkgs}

	return 0
}

ob_get_source_parameter()
{
	local name=

	if [ ${#} -eq 1 ]; then
		name="${1}"
	else
		return 125
	fi

	# Convert field name to uppercase and validate.
	name="$(echo "${name}" | tr 'a-z-' 'A-Z_')"
	case "${name:- }" in
		*[!A-Z0-9_]*)
			return 125
			;;
	esac

	eval echo \"\$\{"_OB_SRCFIELD_${name}"\}\"

	return 0
}

ob_get_binary_parameter()
{
	local package=
	local name=

	if [ ${#} -eq 2 ]; then
		package="${1}"
		name="${2}"
	else
		return 125
	fi

	if ! ob_validate_binary_name "${package}"; then
		return 125
	fi

	# Convert package name to its uppercase "clean" form.
	package="$(echo "${package}" | tr 'a-z' 'A-Z' | \
		tr -dC 'A-Z0-9')"

	# Convert field name to uppercase and validate.
	name="$(echo "${name}" | tr 'a-z-' 'A-Z_')"
	case "${name:- }" in
		*[!A-Z0-9_]*)
			return 125
			;;
	esac

	eval echo \"\$\{"_OB_BINFIELD_${package}_${name}"\}\"

	return 0
}

ob_get_doc_package()
{
	if [ ${#} -gt 0 ]; then
		return 125
	fi

	_ob_package_do 'get_doc_package'

	return ${?}
}

ob_get_doc_files()
{
	local arch=
	local plat=

	if [ ${#} -eq 2 ]; then
		arch="${1}"
		plat="${2}"
	else
		return 125
	fi

	_ob_package_do 'get_doc_files' "${arch}" "${plat}"

	return ${?}
}

ob_summarize_package_arch()
{
	if [ ${#} -gt 0 ]; then
		return 125
	fi

	# XXX: Stub.

	return 0
}

ob_summarize_package_plat()
{
	if [ ${#} -gt 0 ]; then
		return 125
	fi

	# XXX: Stub.

	return 0
}

ob_set_package_substvars()
{
	local pkg=

	if [ ${#} -eq 1 ]; then
		pkg="${1}"
	else
		return 125
	fi

	_ob_package_do 'set_package_substvars' "${pkg}"

	return ${?}
}

_ob_set_binary_packages()
{
	local packages=

	packages="${1}"

	_OB_BINARY_PACKAGES="${packages}"

	return 0
}

_ob_set_source_parameter()
{
	local name=
	local value=

	name="${1}"
	value="${2}"

	# Convert field name to uppercase and validate.
	name="$(echo "${name}" | tr 'a-z-' 'A-Z_')"
	case "${name:- }" in
		*[!A-Z0-9_]*)
			return 125
			;;
	esac

	_OB_SOURCE_PARAMETERS="${_OB_SOURCE_PARAMETERS} ${name}"

	# Escape the value.
	value="$(echo "${value}" | sed "s/'/'\\\\''/g")"

	eval "_OB_SRCFIELD_${name}='${value}'"

	return 0
}

_ob_set_binary_parameter()
{
	local package=
	local name=
	local value=

	package="${1}"
	name="${2}"
	value="${3}"

	if ! ob_validate_binary_name "${package}"; then
		return 125
	fi

	# Convert package name to its uppercase "clean" form.
	package="$(echo "${package}" | tr 'a-z' 'A-Z' | \
		tr -dC 'A-Z0-9')"

	# Convert field name to uppercase and validate.
	name="$(echo "${name}" | tr 'a-z-' 'A-Z_')"
	case "${name:- }" in
		*[!A-Z0-9_]*)
			return 125
			;;
	esac

	if ! echo " ${_OB_BINARY_PARAMETERS} " | grep " ${name} " \
			>/dev/null 2>&1; then
		_OB_BINARY_PARAMETERS="${_OB_BINARY_PARAMETERS} ${name}"
	fi

	# Escape the value.
	value="$(echo "${value}" | sed "s/'/'\\\\''/g")"

	eval "_OB_BINFIELD_${package}_${name}='${value}'"

	return 0
}