#!/usr/bin/env bash
# This script will help you diff a *-libre PKGBUILD against the unfree one
# to check for updates.

# Copyright (C) 2010-2011 Nicolás Reynolds <fauno@parabola.nu>
# Copyright (C) 2011 Joshua Ismael Haase Hernández (xihh) <hahj87@gmail.com>
# Copyright (C) 2017 Luke Shumaker <lukeshu@parabola.nu>
#
# License: GNU GPLv3+
#
# This file is part of Parabola.
#
# Parabola 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.
#
# Parabola 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 Parabola. If not, see <http://www.gnu.org/licenses/>.

. "$(librelib messages)"
. "$(librelib conf)"

usage() {
	print "Usage: %s [community|packages] [unfree-package] [repo]" "${0##*/}"
	print "Usage: %s --help" "${0##*/}"
	prose "Helps you diff build scripts from ABSLibre against (Unfree) ABS."
	echo
	prose "Package name and repo will we guessed if you don't specify them."
}

main() {
	if [[ "$1" == "--help" ]]; then
		usage
		return $EXIT_SUCCESS
	fi

	load_conf libretools.conf DIFFPROG || exit

	local package_guess=${PWD##*/}
	local repo=${1:-$(basename "${PWD%/*}")}
	local package=${2:-${package_guess%-libre}}
	local trunk=${3:-trunk}

	svnrepo="packages"
	case $repo in
		community*) svnrepo="community";;
		multilib*)  svnrepo="community";;
		*) :;;
	esac

	if [[ ! -r PKGBUILD ]]; then
		error "This is not a build dir."
		exit $EXIT_FAILURE
	fi


	tmp_dir="$(mktemp --tmpdir -d "${package}.XXXXXX")"
	if [[ ! -d "${tmp_dir}" ]]; then
		error "Can't create temp dir"
		exit $EXIT_FAILURE
	fi
	unfree_dir="${tmp_dir}/${svnrepo}/${package}/${trunk}"

	pushd "${tmp_dir}" &>/dev/null

	msg "Getting diff from %s..." "$repo/$package"

	svn checkout --depth=empty "svn://svn.archlinux.org/$svnrepo" &>/dev/null

	cd "${svnrepo}"
	svn update "${package}"

	# Back to start dir
	popd &>/dev/null

	msg "Diffing files"

	for _file in "${unfree_dir}"/*; do
		msg2 "%s" "$(basename "${_file}")"
		"${DIFFPROG}" "$PWD/$(basename "${_file}")" "${_file}"
	done
}

main "$@"