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diff --git a/lib/Lintian/Check/Debian/Control/Field/DoubledUp.pm b/lib/Lintian/Check/Debian/Control/Field/DoubledUp.pm
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+# debian/control/field/doubled-up -- lintian check script -*- perl -*-
+#
+# Copyright (C) 2004 Marc Brockschmidt
+# Copyright (C) 2020 Chris Lamb <lamby@debian.org>
+# Copyright (C) 2020-2021 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, you can find it on the World Wide
+# Web at https://www.gnu.org/copyleft/gpl.html, or write to the Free
+# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+package Lintian::Check::Debian::Control::Field::DoubledUp;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+sub source {
+ my ($self) = @_;
+
+ my $control = $self->processable->debian_control;
+ my $source_fields = $control->source_fields;
+
+ # something like "Maintainer: Maintainer: bad field"
+ my @doubled_up_source_fields
+ = grep { $source_fields->value($_) =~ m{^ \Q$_\E \s* : }ix }
+ $source_fields->names;
+
+ for my $field (@doubled_up_source_fields) {
+
+ my $control_item= $self->processable->debian_control->item;
+ my $position = $source_fields->position($field);
+ my $pointer = $control_item->pointer($position);
+
+ $self->pointed_hint('debian-control-repeats-field-name-in-value',
+ $pointer, '(in section for source)', $field);
+ }
+
+ for my $installable ($control->installables) {
+ my $installable_fields = $control->installable_fields($installable);
+
+ # something like "Maintainer: Maintainer: bad field"
+ my @doubled_up_installable_fields
+ = grep { $installable_fields->value($_) =~ m{^ \Q$_\E \s* : }ix }
+ $installable_fields->names;
+
+ for my $field (@doubled_up_installable_fields) {
+
+ my $control_item= $self->processable->debian_control->item;
+ my $position = $installable_fields->position($field);
+ my $pointer = $control_item->pointer($position);
+
+ $self->pointed_hint('debian-control-repeats-field-name-in-value',
+ $pointer,"(in section for $installable)", $field);
+ }
+ }
+
+ return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et