1 files changed, 79 insertions, 0 deletions
diff --git a/lib/Lintian/Check/Fields/Essential.pm b/lib/Lintian/Check/Fields/Essential.pm
new file mode 100644
index 0000000..87d43c3
--- /dev/null
+++ b/lib/Lintian/Check/Fields/Essential.pm
@@ -0,0 +1,79 @@
+# fields/essential -- lintian check script (rewrite) -*- perl -*-
+#
+# Copyright (C) 2004 Marc Brockschmidt
+#
+# Parts of the code were taken from the old check script, which
+# was Copyright (C) 1998 Richard Braakman (also licensed under the
+# GPL 2 or higher)
+#
+# 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::Fields::Essential;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+sub source {
+    my ($self) = @_;
+
+    my $fields = $self->processable->fields;
+
+    $self->hint('essential-in-source-package')
+      if $fields->declares('Essential');
+
+    return;
+}
+
+sub always {
+    my ($self) = @_;
+
+    my $fields = $self->processable->fields;
+
+    return
+      unless $fields->declares('Essential');
+
+    my $essential = $fields->unfolded_value('Essential');
+
+    unless ($essential eq 'yes' || $essential eq 'no') {
+        $self->hint('unknown-essential-value');
+        return;
+    }
+
+    $self->hint('essential-no-not-needed') if $essential eq 'no';
+
+    my $KNOWN_ESSENTIAL = $self->data->load('fields/essential');
+
+    $self->hint('new-essential-package')
+      if $essential eq 'yes'
+      && !$KNOWN_ESSENTIAL->recognizes($self->processable->name);
+
+    return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et