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+# -*- perl -*-
+# Lintian::Processable::IsNonFree -- interface to source package data collection
+
+# Copyright (C) 2008 Russ Allbery
+# Copyright (C) 2009 Raphael Geissert
+# Copyright (C) 2020 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::Processable::IsNonFree;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Moo::Role;
+use namespace::clean;
+
+=head1 NAME
+
+Lintian::Processable::IsNonFree - Lintian interface to source package data collection
+
+=head1 SYNOPSIS
+
+    my ($name, $type, $dir) = ('foobar', 'source', '/path/to/lab-entry');
+    my $collect = Lintian::Processable::IsNonFree->new($name);
+    if ($collect->native) {
+        print encode_utf8("Package is native\n");
+    }
+
+=head1 DESCRIPTION
+
+Lintian::Processable::IsNonFree provides an interface to package data for source
+packages.  It implements data collection methods specific to source
+packages.
+
+This module is in its infancy.  Most of Lintian still reads all data from
+files in the laboratory whenever that data is needed and generates that
+data via collect scripts.  The goal is to eventually access all data about
+source packages via this module so that the module can cache data where
+appropriate and possibly retire collect scripts in favor of caching that
+data in memory.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item is_non_free
+
+Returns a truth value if the package appears to be non-free (based on
+the section field; "non-free/*" and "restricted/*")
+
+=cut
+
+has is_non_free => (
+    is => 'rw',
+    lazy => 1,
+    default => sub {
+        my ($self) = @_;
+
+        my $section;
+
+        if ($self->type eq 'source') {
+            $section = $self->debian_control->source_fields->value('Section');
+        } else {
+            $section = $self->fields->value('Section');
+        }
+
+        $section ||= 'main';
+
+        return 1
+          if $section
+          =~ m{^(?:non-free|non-free-firmware|restricted|multiverse)/};
+
+        return 0;
+    }
+);
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Russ Allbery <rra@debian.org> for Lintian.
+Amended 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