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

#
# exp_pkg_env_defaults() - set package variable defaults for single named package
# @_build_steps_default:	list of default build steps
# @_pkg_name:			single package name
# @_workdir:			pathname to build-specific temporary directory
#
# Return:			zero (0) on success, non-zero (>0) on failure
#
exp_pkg_env_defaults() {
	local _build_steps_default="${1}" _pkg_name="${2}" _workdir="${3}";
	: ${PKG_NAME:="${_pkg_name}"};
	: ${MIDIPIX_BUILD_PWD:="$(pwd)"};
	: ${PKG_BASE_DIR:="${_workdir}/${_pkg_name}-${PKG_BUILD_TYPE}-${PKG_TARGET}"};
	if [ -n "${PKG_BUILD_STEPS_DISABLE:-}" ]; then
		: ${PKG_BUILD_STEPS:="$(rtl_lfilter "${_build_steps_default}" "${PKG_BUILD_STEPS_DISABLE:-}")"};
	else
		: ${PKG_BUILD_STEPS:="${_build_steps_default}"};
	fi;
	if [ -n "${PKG_URL:-}" ]; then
		: ${PKG_FNAME:="${PKG_URL##*/}"};
	fi;
	if [ -z "${PKG_SUBDIR:-}" ]; then
		if [ -n "${PKG_URLS_GIT:-}" ]\
		&& [ -n "${PKG_FNAME:-}" ]; then
			rtl_log_msg fatalexit "Error: \${PKG_SUBDIR} must be specified given both \${PKG_FNAME} and \${PKG_URLS_GIT}.";
		elif [ -n "${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}";
	PKG_DESTDIR_HOST="${PKG_BASE_DIR}/${PKG_DESTDIR_HOST:-destdir_host}";
};

#
# exp_pkg_env_set() - set package variables for single named package
# @_build_vars_default:	list of default build variables
# @_group_name:		build group name
# @_nounset:		don't clear package variable namespace
# @_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 ${PKG_ENV_VARS_EXTRA}, and
# clears the package variable namespace.
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
exp_pkg_env_set() {
	local	_build_vars_default="${1}" _group_name="${2}" _nounset="${3}"		\
		_pkg_name="${4}" _cmd_name="" _var_prefixes="" _vars_set=""		\
		_vname="" IFS IFS0;

	rtl_set_vars _vars_set BUILD_TYPE "DEFAULT ${_group_name} PKG_${_pkg_name}";
	rtl_set_vars _vars_set INHERIT_FROM "PKG_${_pkg_name}";
	_var_prefixes="$(rtl_toupper "DEFAULT DEFAULT_${PKG_BUILD_TYPE} ${_group_name}")";
	for _vname in $(rtl_lfilter "${_build_vars_default}" BUILD_TYPE); do
		if [ -n "${PKG_INHERIT_FROM:-}" ]; then
			rtl_set_vars _vars_set "${_vname}"				\
				"$(rtl_lconcat "${_var_prefixes}"			\
				"$(rtl_toupper "PKG_${PKG_INHERIT_FROM} PKG_${PKG_INHERIT_FROM}_${BUILD_KIND} PKG_${_pkg_name} PKG_${_pkg_name}_${BUILD_KIND}")")";
		else
			rtl_set_vars _vars_set "${_vname}"				\
				"$(rtl_lconcat "${_var_prefixes}"			\
				"$(rtl_toupper "PKG_${_pkg_name} PKG_${_pkg_name}_${BUILD_KIND}")")";
		fi;
	done;
	IFS0="${IFS:- }"; IFS=":"; for _vname in ${PKG_ENV_VARS_EXTRA:-}; do
		export "${_vname}";
	done; IFS="${IFS0}";
	if [ "${_nounset:-0}" -eq 0 ]; then
		rtl_unset_vars $(rtl_lfilter						\
			"$(set | sed -ne '/^PKG_[^=]*=/s/=.*$//p' | paste -s -d " ")"	\
			"${_vars_set}");
	fi;

	for _vname in AR CC CXX PKG_CONFIG RANLIB; do
		if eval [ '"${PKG_'"${_vname}"':+1}"' = 1 ]\
		&& eval [ '"${PKG_'"${_vname}"'#/}"' = '"${_cmd_name:=${PKG_'"${_vname}"'}}"' ]; then
			eval PKG_${_vname}='$(which "${_cmd_name}")';
		fi; _cmd_name="";
	done;
};

#
# ex_pkg_env() - set package variables for single named package
# @_build_steps_default:	list of default build steps
# @_build_vars_default:		list of default build variables
# @_group_name:			build group name
# @_nounset:			don't clear package variable namespace
# @_pkg_name:			single package name
# @_restart_at:			optional comma-separated list of build steps at which to rebuild or ALL or LAST
# @_workdir:			pathname to build-specific temporary directory
#
# Return:			zero (0) on success, non-zero (>0) on failure
#
ex_pkg_env() {
	local	_build_steps_default="${1}" _build_vars_default="${2}" _group_name="${3}"	\
		_nounset="${4}" _pkg_name="${5}" _restart_at="${6}" _workdir="${7}" _vname="";
	rtl_fileop source_opt "vars/${_pkg_name}.vars" "${_group_name}/${_pkg_name}.${_group_name}";
	if ! exp_pkg_env_set "${_build_vars_default}" "${_group_name}" "${_nounset}" "${_pkg_name}"\
	|| ! exp_pkg_env_defaults "${_build_steps_default}" "${_pkg_name}" "${_workdir}"; then
		return 1;
	fi;
};

#
# ex_pkg_state_set() - update build step status for single named package
# @_pkg_name:		single package name
# @_build_step:		build step set status of
# [@${@}]:		optional list of build steps to invalidate status of
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_state_set() {
	rtl_state_set "${_workdir}" "${@}";
};

#
# ex_pkg_state_test() - test build step status of single named package
# @_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 or LAST
#
# Return:		zero (0) on success, non-zero (>0) on failure
#
ex_pkg_state_test() {
	rtl_state_test "${_workdir}" "${@}";
};

# vim:filetype=sh