#!/usr/bin/env bash
# Launcher for generating the required locale data for gettext internationalization(I18N) support
# Refer to: locale(7), localedef(1), The GNU C Library Manual - Locales and Internationalization, The GNU C Library Manual - Installing the GNU C Library - Installing the C Library
# This launcher is based on Sebastien Bacher's comment in the following topic:
#   Lack of compiled locales breaks gettext based localisation - snapcraft - snapcraft.io
#   https://forum.snapcraft.io/t/lack-of-compiled-locales-breaks-gettext-based-localisation/3758/3
# 林博仁(Buo-ren, Lin) © 2018

set \
	-o errexit \
	-o errtrace \
	-o nounset \
	-o pipefail

if ! command -v localedef >/dev/null; then
	printf -- \
		"locale-launch: \"localedef\" command not found, you're probably not using the stage snap properly, refer the snapcraft forum topic for info on using this stage snap.\\n" \
		>&2
	printf -- \
		"locale-launch: If you're an user of this application, contact the publisher that their packaging has an error.\\n" \
		>&2
fi

export LOCPATH="${SNAP}"/usr/lib/locale

if ! [ -d "${LOCPATH}"/en_US.utf8 ]; then
	# locales-all package isn't staged, locale data needs to be generated manually
	export I18NPATH="${SNAP}"/usr/share/i18n
	LOCPATH="${SNAP_USER_COMMON}"/.local/lib/locale
	if [ ! -d "${LOCPATH}" ]; then
		mkdir \
			--parents \
			"${LOCPATH}"
	fi

	declare locale; for locale_variable_name in \
		LANG \
		LC_CTYPE \
		LC_NUMERIC \
		LC_TIME \
		LC_COLLATE \
		LC_MONETARY \
		LC_MESSAGES \
		LC_PAPER \
		LC_NAME \
		LC_ADDRESS \
		LC_TELEPHONE \
		LC_MEASUREMENT \
		LC_IDENTIFICATION; do
		declare -n locale_variable="${locale_variable_name}"

		if ! test -v locale_variable \
			|| test -z "${locale_variable}" \
			|| test "${locale_variable}" = C.UTF-8 \
			|| test "${locale_variable}" = C; then
			continue
		fi

		locale="$(
			cut \
				--delimiter=. \
				--fields=1 \
				<<< "${locale_variable}"
		)"

		if [ ! -d "${LOCPATH}"/"${locale}".UTF-8 ]; then
			printf -- \
				'locales-launch: Data of %s locale not found, generating, please wait...\n' \
				"${locale}" \
				>&2
			localedef \
				--charmap=UTF-8 \
				--inputfile="${locale}" \
				"${LOCPATH}"/"${locale}".UTF-8 \
				|| true # Don't errexit when fail (ret=1, 4)
		fi

		unset -n locale_variable
	done; unset I18NPATH locale
fi

exec "${@}"