#!/usr/bin/perl

# after running this script and installing and testing the package,
# can use rebuild-for-athena script

use 5.028;
use strict;
use warnings;

use Cwd;
use Git::Wrapper;

my $to_merge = "origin/master";

my $git = Git::Wrapper->new(getcwd);

chomp(my $prev_version = `dpkg-parsechangelog -SVersion`);
chomp(my $prev_distn   = `dpkg-parsechangelog -SDistribution`);

my ($prev_date, $prev_rev) = ($prev_version =~ /git([0-9]+).([0-9]+)/);
my ($new_date) = $git->show("-s", { format => "%ci" }, $to_merge);
$new_date =~ /\A([0-9]{4})-([0-9]{2})-([0-9]{2})/
  or die "couldn't parse new commit committer date";
$new_date = $1 . $2 . $3;
my $new_rev = $prev_date eq $new_date ? $prev_rev + 1 : 1;

$git->merge($to_merge);

system "dch", "-v28~git${new_date}.${new_rev}",
  $prev_distn eq "UNRELEASED" ? "" : "Package git snapshot.";
$git->add("debian/changelog");
$git->commit({ message => "changelog" });