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+# -*- perl -*-
+#
+# Copyright (C) 2008 by Raphael Geissert <atomo64@gmail.com>
+# Copyright (C) 2017-2018 Chris Lamb <lamby@debian.org>
+# Copyright (C) 2021 Felix Lechner
+#
+# 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 2 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 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/>.
+
+package Lintian::Data::Debhelper::Addons;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Carp qw(croak);
+use Const::Fast;
+use List::SomeUtils qw(first_value any uniq);
+use PerlIO::gzip;
+use Unicode::UTF8 qw(encode_utf8);
+
+const my $SPACE => q{ };
+const my $SLASH => q{/};
+
+const my $WAIT_STATUS_SHIFT => 8;
+
+const my $ADD_ONS => 'add_ons';
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Data::PreambledJSON';
+
+=head1 NAME
+
+Lintian::Data::Debhelper::Addons - Lintian interface for debhelper addons.
+
+=head1 SYNOPSIS
+
+ use Lintian::Data::Debhelper::Addons;
+
+=head1 DESCRIPTION
+
+This module provides a way to load data files for debhelper.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item title
+
+=item location
+
+=item installable_names_by_add_on
+
+=cut
+
+has title => (
+ is => 'rw',
+ default => 'Debhelper Add-ons'
+);
+
+has location => (
+ is => 'rw',
+ default => 'debhelper/add_ons.json'
+);
+
+has installable_names_by_add_on => (is => 'rw', default => sub { {} });
+
+=item all
+
+=cut
+
+sub all {
+ my ($self) = @_;
+
+ return keys %{$self->installable_names_by_add_on};
+}
+
+=item installed_by
+
+=cut
+
+sub installed_by {
+ my ($self, $name) = @_;
+
+ return ()
+ unless exists $self->installable_names_by_add_on->{$name};
+
+ my @installed_by = @{$self->installable_names_by_add_on->{$name} // []};
+
+ push(@installed_by, 'debhelper-compat')
+ if any { $_ eq 'debhelper' } @installed_by;
+
+ return @installed_by;
+}
+
+=item load
+
+=cut
+
+sub load {
+ my ($self, $search_space, $our_vendor) = @_;
+
+ my @candidates = map { $_ . $SLASH . $self->location } @{$search_space};
+ my $path = first_value { -e } @candidates;
+
+ my $reference;
+ return 0
+ unless $self->read_file($path, \$reference);
+
+ my %add_ons = %{$reference // {}};
+ my %installable_names_by_add_on;
+
+ for my $name (keys %add_ons) {
+
+ my @installable_names;
+ push(@installable_names, @{$add_ons{$name}{installed_by}});
+
+ $installable_names_by_add_on{$name} = \@installable_names;
+ }
+
+ $self->installable_names_by_add_on(\%installable_names_by_add_on);
+
+ return 1;
+}
+
+=item refresh
+
+=cut
+
+sub refresh {
+ my ($self, $archive, $basedir) = @_;
+
+ # neutral sort order
+ local $ENV{LC_ALL} = 'C';
+
+ my $port = 'amd64';
+
+ my %add_ons;
+
+ for my $installable_architecture ('all', $port) {
+
+ my $local_path
+ = $archive->contents_gz('sid', 'main', $installable_architecture);
+
+ open(my $fd, '<:gzip', $local_path)
+ or die encode_utf8("Cannot open $local_path.");
+
+ while (my $line = <$fd>) {
+
+ chomp $line;
+
+ my ($path, $finder) = split($SPACE, $line, 2);
+ next
+ unless length $path
+ && length $finder;
+
+ if ($path
+ =~ m{^ usr/share/perl5/Debian/Debhelper/Sequence/ (\S+) [.]pm $}x
+ ) {
+
+ my $name = $1;
+
+ my @locations = split(m{,}, $finder);
+ for my $location (@locations) {
+
+ my ($section, $installable)= split(m{/}, $location, 2);
+
+ $add_ons{$name}{installed_by} //= [];
+ push(@{$add_ons{$name}{installed_by}}, $installable);
+ }
+
+ next;
+ }
+ }
+
+ close $fd;
+ }
+
+ my $data_path = "$basedir/" . $self->location;
+ my $status = $self->write_file($ADD_ONS, \%add_ons,$data_path);
+
+ return $status;
+}
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Felix Lechner <felix.lechner@lease-up.com> for Lintian.
+
+=head1 SEE ALSO
+
+lintian(1)
+
+=cut
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et