#
# set +o errexit -o noglob is assumed.
#

#
# exp_pkg_env_defaults() - set package variable defaults for single named package
# @_pkg_name:		single package name
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_env_defaults() {
	local _pkg_name="${1}";
	: ${PKG_NAME:="${_pkg_name}"};
	: ${MIDIPIX_BUILD_PWD:="$(pwd)"};
	: ${PKG_BASE_DIR:="${BUILD_WORKDIR}/${_pkg_name}-${PKG_BUILD_TYPE}-${PKG_TARGET}"};
	: ${PKG_FNAME:="${PKG_URL##*/}"};
	: ${PKG_BUILD_STEPS:="$(ex_rtl_lfilter "${DEFAULT_BUILD_STEPS}" "${PKG_BUILD_STEPS_DISABLE}")"};
	if [ -z "${PKG_SUBDIR}" ]; then
		if [ -n "${PKG_URLS_GIT}" ]; then
			PKG_SUBDIR="${PKG_URLS_GIT%%=*}";
		else case "${PKG_FNAME}" in
		*.t*)	PKG_SUBDIR="${PKG_FNAME%%.t*}"; ;;
		*)	PKG_SUBDIR="${_pkg_name}"; ;;
		esac; fi;
	fi;
	if [ -z "${PKG_BUILD_DIR}" ]; then
		case "${PKG_IN_TREE:-0}" in
		0) PKG_BUILD_DIR="obj"; ;;
		1) PKG_BUILD_DIR="${PKG_SUBDIR}"; ;;
		esac;
	fi;
	PKG_BUILD_DIR="${PKG_BASE_DIR}/${PKG_BUILD_DIR}";
	PKG_CONFIGURE="${PKG_BASE_DIR}/${PKG_CONFIGURE:-${PKG_SUBDIR}/configure}";
	PKG_DESTDIR="${PKG_BASE_DIR}/${PKG_DESTDIR:-destdir}";
};

#
# exp_pkg_env_set() - set package variables for single named package
# @_group_name:		build group name
# @_pkg_name:		single package name
#
# Sets package variables from either defaults, defaults specific to build type,
# build group, package to inherit from if any, or package for a single named
# package, exports variables optionally named in ${PKG_ENV_VARS_EXTRA}, and
# clears the package variable namespace.
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_env_set() {
	local _group_name="${1}" _pkg_name="${2}" _var_prefixes="" _vars_set="" _vname="";
	ex_rtl_set_vars _vars_set BUILD_TYPE "DEFAULT ${_group_name} PKG_${_pkg_name}";
	ex_rtl_set_vars _vars_set INHERIT_FROM "PKG_${_pkg_name}";
	_var_prefixes="$(ex_rtl_toupper "DEFAULT DEFAULT_${PKG_BUILD_TYPE} ${_group_name}")";
	for _vname in $(ex_rtl_lfilter "${DEFAULT_BUILD_VARS}" BUILD_TYPE); do
		if [ -n "${PKG_INHERIT_FROM}" ]; then
			ex_rtl_set_vars _vars_set "${_vname}"	\
				"$(ex_rtl_lconcat "${_var_prefixes}" "$(ex_rtl_toupper "PKG_${PKG_INHERIT_FROM} PKG_${_pkg_name}")")"
		else
			ex_rtl_set_vars _vars_set "${_vname}"	\
				"$(ex_rtl_lconcat "${_var_prefixes}" "$(ex_rtl_toupper "PKG_${_pkg_name}")")";
		fi;
	done;
	ex_rtl_push_IFS :; for _vname in ${PKG_ENV_VARS_EXTRA}; do
		export "${_vname}";
	done; ex_rtl_pop_IFS;
	ex_rtl_unset_vars $(ex_rtl_lfilter			\
		"$(set | awk -F= '/^PKG_/{print $1}' | sort)"	\
		"${_vars_set}");
};

#
# ex_pkg_env() - set package variables for single named package
# @_group_name:		build group name
# @_pkg_name:		single package name
# @_restart_at:		optional comma-separated list of build steps at which to rebuild or ALL
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_env() {
	local _group_name="${1}" _pkg_name="${2}" _restart_at="${3}" _vname="";
	ex_rtl_fileop source_opt "vars/${_pkg_name}.vars";
	if ! exp_pkg_env_set "${_group_name}" "${_pkg_name}"\
	|| ! exp_pkg_env_defaults "${_pkg_name}"; then
		return "${?}";
	fi;
};

#
# ex_pkg_state_set() - update build step status for single named package
# @_workdir:		pathname to temporary build directory
# @_pkg_name:		single package name
# @${@}:		list of build steps
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_state_set() {
	ex_rtl_state_set "${BUILD_WORKDIR}" "${@}";
};

#
# ex_pkg_state_test() - test build step status of single named package
# @_workdir:		pathname to temporary build directory
# @_pkg_name:		single package name
# @_build_step:		build step to test status of
# @_restart_at:		optional comma-separated list of build steps at which to rebuild or ALL
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_state_test() {
	ex_rtl_state_test "${BUILD_WORKDIR}" "${@}";
};

# vim:filetype=sh