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

# Copyright (C) 2011-2012 Michał Masłowski <mtjm@mtjm.eu>
# Copyright (C) 2012 Daniel Molina (lluvia)
#
# 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 conf.sh)
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 \
    <( (
        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" ]] || [[ "$arc" == "$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'