1 files changed, 114 insertions, 0 deletions
diff --git a/lib/Lintian/Check/Debian/Control/Field/Description/Duplicate.pm b/lib/Lintian/Check/Debian/Control/Field/Description/Duplicate.pm
new file mode 100644
index 0000000..294893b
--- /dev/null
+++ b/lib/Lintian/Check/Debian/Control/Field/Description/Duplicate.pm
@@ -0,0 +1,114 @@
+# debian/control/field/description/duplicate -- 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::Description::Duplicate;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+const my $EMPTY => q{};
+
+sub source {
+    my ($self) = @_;
+
+    my $control = $self->processable->debian_control;
+
+    my %installables_by_synopsis;
+    my %installables_by_exended;
+
+    for my $installable ($control->installables) {
+
+        next
+          if $control->installable_package_type($installable) eq 'udeb';
+
+        my $installable_fields = $control->installable_fields($installable);
+
+        my $description = $installable_fields->untrimmed_value('Description');
+        next
+          unless length $description;
+
+        my ($synopsis, $extended) = split(/\n/, $description, 2);
+
+        $synopsis //= $EMPTY;
+        $extended //= $EMPTY;
+
+        # trim both ends
+        $synopsis =~ s/^\s+|\s+$//g;
+        $extended =~ s/^\s+|\s+$//g;
+
+        if (length $synopsis) {
+            $installables_by_synopsis{$synopsis} //= [];
+            push(@{$installables_by_synopsis{$synopsis}}, $installable);
+        }
+
+        if (length $extended) {
+            $installables_by_exended{$extended} //= [];
+            push(@{$installables_by_exended{$extended}}, $installable);
+        }
+    }
+
+    # check for duplicate short description
+    for my $synopsis (keys %installables_by_synopsis) {
+
+        # Assume that substvars are correctly handled
+        next
+          if $synopsis =~ m/\$\{.+\}/;
+
+        $self->pointed_hint(
+            'duplicate-short-description',
+            $control->item->pointer,
+            (sort @{$installables_by_synopsis{$synopsis}})
+        )if scalar @{$installables_by_synopsis{$synopsis}} > 1;
+    }
+
+    # check for duplicate long description
+    for my $extended (keys %installables_by_exended) {
+
+        # Assume that substvars are correctly handled
+        next
+          if $extended =~ m/\$\{.+\}/;
+
+        $self->pointed_hint(
+            'duplicate-long-description',
+            $control->item->pointer,
+            (sort @{$installables_by_exended{$extended}})
+        )if scalar @{$installables_by_exended{$extended}} > 1;
+    }
+
+    return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et