#!@SH@
#
# Main program file
#
# Copyright (C) 2013, 2014  Patrick "P. J." McDermott
#
# This file is part of the ProteanOS Development Kit.
#
# The ProteanOS Development Kit 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 Development Kit 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 Development Kit.  If not, see
# <http://www.gnu.org/licenses/>.

set -u

# Constant global variables
HT='	'
LF='
'
PACKAGE_NAME='@PACKAGE_NAME@'
PACKAGE_VERSION='@PACKAGE_VERSION@'
PKGDATADIR='@pkgdatadir@'
OPTSTRING='hV'

if [ -f "${0%/*}/../.builddirstamp" ]; then
	in_place=true
	builddir="${0%/*}/.."
else
	in_place=false
	builddir=''
fi

# use() must be defined inline so it can be used to load other modules.
use()
{
	local module="${1}"
	local dir=

	if ${in_place}; then
		dir="${builddir}/lib"
	else
		dir="${PKGDATADIR}"
	fi

	if [ -f "${dir}/${module}.sm" ]; then
		. "${dir}/${module}.sm"
	else
		printf '%s: Error: Failed to load module "%s": %s\n' \
			"${0##*/}" "${module}" 'no such file or directory' >&2
		exit 2
	fi
}

use locale
use cmd
use getopt
use rand

main()
{
	local cmd=

	load_locale
	load_cmds

	if ! get_options "${@}"; then
		cmd_help_main >&2
		exit 1
	fi
	shift $(($OPTIND - 1))

	if ${opt_h:-false}; then
		cmd='help'
	elif ${opt_V:-false}; then
		cmd='version'
	elif [ ${#} -lt 1 ]; then
		cmd_help_main >&2
		exit 1
	else
		cmd="${1}"
		shift
	fi

	srand $(expr ${$} + $(date '+%s'))

	case "${cmd}" in
		'help'|'version') ;;
		*) check_uid || error 1 "$(get_msg 'uid_0_req')";;
	esac
	run_cmd "${cmd}" "${@}"

	return ${?}
}

check_uid()
{
	local uname_s=
	local uid=

	uname_s="$( (uname -s) 2>/dev/null)" || uname_s='unknown'
	uid="$(id -u)"

	case "${uname_s}" in
		'Linux')
			if [ ${uid} -ne 0 ]; then
				return 1
			fi
			;;
	esac

	return 0
}

main "${@}"