# pro-archman
# src/locale.sh
# Locale functions
#
# Copyright (C) 2012, 2013, 2017, 2019  Patrick McDermott
#
# This file is part of the ProteanOS Archive Manager.
#
# The ProteanOS Archive Manager 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.
#
# The ProteanOS Archive Manager 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 the ProteanOS Archive Manager.  If not, see
# <http://www.gnu.org/licenses/>.

DEFAULT_LOCALE='en_US'

_try_load_locale()
{
	local localedir="${1}"
	local locale="${2}"
	shift 2
	local ms=

	for ms in "${localedir}/${locale}/LC_MESSAGES/${TEXTDOMAIN}.ms" \
			"${localedir}/${locale}.ms"; do
		# POSIX on the dot utility:
		# "If no readable file is found, a non-interactive shell shall
		# abort"
		# So to survive an ENOENT or other error and display a more
		# informative error message before aborting, we need this
		# eval/cat command.  This is more resilient against race
		# conditions than `[ -f "${ms}" ]` is.
		ms="$(cat -- "${ms}" 2>/dev/null)" || continue
		eval "${ms}"
		return 0
	done

	return 1
}

load_locale()
{
	local localedir=

	# Make sure LC_MESSAGES is set.
	if [ "x${LC_MESSAGES+set}" != 'xset' ]; then
		if [ "x${LC_ALL+set}" = 'xset' ]; then
			LC_MESSAGES="${LC_ALL}"
		elif [ "x${LANG+set}" = 'xset' ]; then
			LC_MESSAGES="${LANG}"
		else
			LC_MESSAGES="${DEFAULT_LOCALE}"
		fi
	fi

	if ${in_place}; then
		localedir="${builddir}/locale"
	else
		localedir="${LOCALEDIR}"
	fi

	# Try to load the locale.
	if ! _try_load_locale "${localedir}" \
			"${LC_MESSAGES%.*}"; then
		if ! _try_load_locale "${localedir}" \
				"${LC_MESSAGES%_*}"; then
			if ! _try_load_locale "${localedir}" \
					"${DEFAULT_LOCALE}"; then
				error 1 'Cannot load locale'
				return 1
			fi
		fi
	fi

	return 0
}

get_msg()
{
	local msgid="${1}"
	shift 1

	eval "printf '%s' \"\${msg_${TEXTDOMAIN}_${msgid}}\""

	return 0
}