install

#!/bin/sh
# -*- sh -*-
# vim: syntax=sh
# code: language=shellscript

# Copyright (c) 2024 Michael Federczuk
# SPDX-License-Identifier: MPL-2.0 AND Apache-2.0

#region preamble

case "$-" in
	(*'i'*)
		\command printf 'script was called interactively\n' >&2
		return 124
		;;
esac

set -o errexit
set -o nounset

# enabling POSIX-compliant behavior for GNU programs
export POSIXLY_CORRECT=yes POSIX_ME_HARDER=yes

if [ "${0#/}" = "$0" ]; then
	argv0="$0"
else
	argv0="$(basename -- "$0" && printf x)"
	argv0="${argv0%"$(printf '\nx')"}"
fi
readonly argv0

#endregion

if [ $# -gt 0 ]; then
	printf '%s: too many arguments: %i\n' "$argv0" $# >&2
	exit 4
fi

if ! command -v localedef > '/dev/null'; then
	printf '%s: localedef: program missing\n' "$argv0" >&2
	exit 27
fi

uid="$(id -u)"
readonly uid

if [ "$uid" != '0' ] && [ -t 2 ]; then
	printf 'The script should be executed as the root user. Continue anyway? [y/N] ' >&2

	read -r ans

	case "$ans" in
		([yY]*)
			# continue
			;;
		(*)
			printf 'Aborted.\n' >&2
			exit 48
			;;
	esac

	unset -v ans
fi

root_dir_pathname="$(dirname -- "$0" && printf x)"
root_dir_pathname="${root_dir_pathname%"$(printf '\nx')"}"
readonly root_dir_pathname

custom_locale_defintion_filename='en_AT@custom'
readonly custom_locale_defintion_filename

custom_locale_definition_file_source_pathname="$root_dir_pathname/$custom_locale_defintion_filename"
readonly custom_locale_definition_file_source_pathname

custom_locale_definition_file_target_pathname="/usr/share/i18n/locales/$custom_locale_defintion_filename"
readonly custom_locale_definition_file_target_pathname

if [ -e "$custom_locale_definition_file_target_pathname" ]; then
	if [ ! -f "$custom_locale_definition_file_target_pathname" ]; then
		if [ -d "$custom_locale_definition_file_target_pathname" ]; then
			what='file'
		else
			what='regular file'
		fi
		readonly what

		printf '%s: %s: not a %s\n' "$argv0" "$custom_locale_definition_file_target_pathname" "$what" >&2
		exit
	fi

	if [ -t 2 ]; then
		printf 'The file %s already exists. Override it? [y/N] ' "$custom_locale_definition_file_target_pathname" >&2

		read -r ans

		case "$ans" in
			([yY]*)
				# continue
				;;
			(*)
				printf 'Aborted.\n' >&2
				exit 49
				;;
		esac

		unset -v ans
	fi

	rm -- "$custom_locale_definition_file_target_pathname"
fi

cp -f -- "$custom_locale_definition_file_source_pathname" "$custom_locale_definition_file_target_pathname"

localedef -c -f UTF-8 -i "$custom_locale_definition_file_target_pathname" 'en_AT.UTF-8@custom'