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#!/usr/bin/env bash
# -*- coding: utf-8 -*-

# Copyright (C) 2011-2012 Michał Masłowski <mtjm@mtjm.eu>
# Copyright (C) 2012 Daniel Molina (lluvia)
# Copyright (C) 2017 Luke Shumaker <lukeshu@sbcglobal.net>
#
# License: GNU GPLv3+
#
# This program 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.
#
# This program 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

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

main() {
	load_files libretools
	check_vars libretools WORKDIR

	for arg in "$@" ; do
		case "$arg" in
			-h|--h|--he|--hel|--help|-\?)
				{
					print 'Usage: %s repo [arch]' "${0##*/}"
					echo
					prose "This script outputs a diff of package names and versions
					       in repo between pacman's sync db and abslibre checkout."
				} >&2
				exit 0
				;;
		esac
	done

	# The repo to find missing packages in.
	repo=$1
	# The arch to check in Arch repos, other will have all arches checked.
	arch=${2:-mips64el}
	# A Python tuple of repos which don't have arch=any packages.
	archrepos='("core", "extra", "community")'

	diff -U0 \
	     <(pacman_list_packages | sort ) \
	     <(abslibre_list_packages | sort ) \
		| sed -rn 's/^[+-][^+-].+$/&/p'
}

pacman_list_packages() {
	cd /var/lib/pacman/sync
	for f in $repo.db ; do
		tar xOf $f | python -c 'import sys
arch = None
name = None
version = None
it = iter(sys.stdin)
try:
    while True:
        line = next(it)
        if line == "%ARCH%\n":
            arch = next(it)
            if arch == "'"$arch"'\n" or "'"$repo"'" not in '"$archrepos"':
                print("%s-%s" % (name.strip(), version.strip()))
        if line == "%NAME%\n":
            name = next(it)
        if line == "%VERSION%\n":
            version = next(it)
except StopIteration:
    pass
'
	done
}

abslibre_list_packages() {
	cd "${WORKDIR}/abslibre"
	# Needed to not include pkgnames specific to other arches.
	CARCH=$arch
	for f in $repo/* ; do
		load_PKGBUILD "$f/PKGBUILD" || continue
		is_here=false
		for arc in ${arch[@]} ; do
			if [[ "$arc" == "any" ]] || [[ "$arc" == "$CARCH" ]] ; then
				is_here=true
				break
			fi
		done
		if [[ "$is_here" == "true" ]] ; then
			for name in "${pkgname[@]}" ; do
				if [[ -z "$epoch" ]] ; then
					echo $name-$pkgver-$pkgrel
				else
					echo $name-$epoch:$pkgver-$pkgrel
				fi
			done
		fi
	done
}

main "$@"