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#!/usr/bin/perl

use strict;
use warnings;
use Getopt::Long;
use Pod::Usage qw( pod2usage );
use Path::Tiny;
use HTTP::Tiny;
use IO::Uncompress::Gunzip qw(gunzip $GunzipError);
use Debian::Control;
use Dpkg::Control::HashCore;
use Debian::PkgPerl::Util;
use 5.010;

# 0) setup
my %opt;
GetOptions( \%opt, 'help|h', 'man|m', ) || pod2usage(2);
pod2usage(1)                              if $opt{help};
pod2usage( -exitval => 0, -verbose => 2 ) if $opt{man};

my $dpt_packages = $ENV{'DPT_PACKAGES'};
die "Required configuration variable DPT_PACKAGES is not set
in ~/.dpt.conf or ~/.config/dpt.conf or in your environment.\n"
    unless $dpt_packages;
$dpt_packages =~ s/~/$ENV{'HOME'}/;
die "No directory called '$dpt_packages' found: $!" unless -d $dpt_packages;

# 1) local repos
my $gitpkgs = path($dpt_packages)->visit(
    sub {
        my ( $dir, $state ) = @_;

        my $changelog = $dir->child('debian/changelog');
        return unless -f $changelog;
        my ($head) = $changelog->lines( { count => 1, chomp => 1, } );

        # "zonemaster-gui (1.0.7-2) UNRELEASED; urgency=medium
        my ( $pkg, $ver, $dist, $urgency ) = split /\s/, $head;
        $ver     =~ s|\((.+)\)|$1|;
        $dist    =~ s|;||;
        $urgency =~ s|urgency=||;

        my $control = $dir->child('debian/control');
        return unless -f $control;
        my $c = Debian::Control->new();
        $c->read("$control");
        my $uploaders = $c->source->Uploaders;
        $uploaders =~ s/\n//;
        $uploaders =~ s/\s*//;
        $uploaders //= '';

        $state->{$pkg} = {
            ver       => $ver,
            dist      => $dist,
            urgency   => $urgency,
            uploaders => $uploaders,
        };
    },
    { recurse => 0, follow_symlinks => 0, }    # defaults
);

# 2) Sources
my @sources;
foreach my $component (qw/main contrib non-free non-free-firmware/) {
    my $sourcesgz = Debian::PkgPerl::Util->download_and_cache_file(
        "https://deb.debian.org/debian/dists/unstable/$component/source/Sources.gz",
        "Sources.$component.gz",
        6 * 60 * 60
    );

    use IO::Uncompress::Gunzip qw(gunzip $GunzipError);
    ( my $sources = $sourcesgz ) =~ s/\.gz$//;
    my $status = gunzip "$sourcesgz" => "$sources"
        or die "gunzip failed: $GunzipError\n";
    push @sources, $sources;
}

my @srcpkgs
    = qx|grep-dctrl --no-field-names --show-field Package --field Maintainer --pattern pkg-perl-maintainers\@lists.alioth.debian.org @sources|;
unlink @sources; # rm uncompressed files

# 3) removals
my $removalsfile = Debian::PkgPerl::Util->download_and_cache_file(
    'https://ftp-master.debian.org/removals-full.822',
    'removals-full.822',
    24 * 60 * 60
);
my $removalfh = path($removalsfile)->openr;
my $removal_deb822;
while (
    defined(
        $removal_deb822
            = Dpkg::Control::HashCore->new( allow_duplicate => 1 )
    )
    and ( $removal_deb822->parse( $removalfh, $removalsfile ) )
    )
{
    next unless $removal_deb822->{Sources}; # e.g. binaries only in auto-craft
    my $reason = $removal_deb822->{Reason};
    next if $reason =~ /\[auto-cruft\]/;    # e.g. "[auto-cruft] NVIU"
    next if $reason =~ /NVIU/;              # e.g. "[rene] NVIU"
    my $date    = $removal_deb822->{Date};
    my @sources = grep {/\S/} split /^/, $removal_deb822->{Sources};
    chomp @sources;
    foreach (@sources) {
        my ( $source, $version ) = split /_/, $_;
        next unless defined $gitpkgs->{$source};
        my $comment = "RM: date: $date, version: $version, reason: $reason";
        $gitpkgs->{$source}->{comment} .= $comment;
    }
}

# 4) NEW queue
my $newfile
    = Debian::PkgPerl::Util->download_and_cache_file(
        'https://ftp-master.debian.org/new.822',
        'new.822', 24 * 60 * 60 );
my $newfh = path($newfile)->openr;
my $new_deb822;
while (
    defined(
        $new_deb822 = Dpkg::Control::HashCore->new( allow_duplicate => 1 )
    )
    and ( $new_deb822->parse( $newfh, $newfile ) )
    )
{
    next unless $new_deb822->{Source};
    my $source  = $new_deb822->{Source};
    my $version = $new_deb822->{Version};
    my $age     = $new_deb822->{Age};

    next unless defined $gitpkgs->{$source};
    my $comment = "NEW: version: $version, age: $age";
    $gitpkgs->{$source}->{comment} .= $comment;
}

# 5) output
my $title = "Packages in Git but not in Sources (as pkg-perl): ";
say "\n$title";
my $format = "%-45s %-15s %-15s %-25s %-s\n";
printf $format, 'Source package', 'Version', 'Distribution', 'Uploaders', '';
say '-' x 101;

my $count;
foreach my $p ( sort keys %{$gitpkgs} ) {
    next if grep ( /^$p$/, @srcpkgs );
    printf $format, $p, $gitpkgs->{$p}->{ver}, $gitpkgs->{$p}->{dist},
        $gitpkgs->{$p}->{uploaders},
        ( $gitpkgs->{$p}->{comment}
            ? '| ' . $gitpkgs->{$p}->{comment}
            : '' );
    $count++;
}

say '=' x 101;
say "Count: $count";

exit;

__END__

=head1 NAME

dpt-never-uploaded - list packages in Git which are not in the archive

=head1 SYNOPSIS

B<dpt never-uploaded> I<[--help|-h]> I<[--man|-m]>

=head1 DESCRIPTION

B<dpt never-uploaded> compares the local Git repositories of packages with
the contents of the Sources files in the archive where the Debian Perl Group
is the maintainer, and outputs a list of packages not found in unstable.
These are candidates for either uploading or removing or updating the
maintainer field, unless they are in the NEW queue or only in experimental.

=head1 OPTIONS

=over

=item B<--help|-h>

Show this help.

=item B<--man|-m>

Show full manpage.

=back

=head1 CONFIGURATION

B<dpt never-uploaded> uses the C<DPT_PACKAGES> environment variable.

See L<dpt-config(5)> for details.

=head1 COPYRIGHT AND LICENSE

Copyright 2023-2024, gregor herrmann E<lt>gregoa@debian.orgE<gt>

Released under the same terms as Perl itself, i.e. Artistic or GPL-1+.