#!/bin/bash -e
# -*- coding: utf-8 -*-
# Copyright (C) 2011, 2012  Michał Masłowski  <mtjm@mtjm.eu>
#
# 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/>.

. $(librelib conf.sh)
load_files libretools
check_vars libretools WORKDIR

for arg in "$@" ; do
    case "$arg" in
        -h|--h|--he|--hel|--help|-\?)
            echo 'Usage: libreaddiff repo [arch]

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 \
    <( (
        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
    ) | sort ) \
    <( (
        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" -o "$arc" = "$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
    ) | sort ) | sed -rn 's/^[+-][^+-].+$/&/p'