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diff --git a/lib/Lintian/Check/Desktop/X11.pm b/lib/Lintian/Check/Desktop/X11.pm
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+# desktop/x11 -- lintian check script -*- perl -*-
+
+# Copyright (C) 1998 Christian Schwarz and Richard Braakman
+#
+# 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::Desktop::X11;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use List::SomeUtils qw(any none);
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+has fontdirs => (is => 'rw', default => sub { {} });
+
+sub visit_installed_files {
+ my ($self, $item) = @_;
+
+ # links to FHS locations are allowed
+ $self->pointed_hint('package-installs-file-to-usr-x11r6', $item->pointer)
+ if $item->name =~ m{^usr/X11R6/} && !$item->is_symlink;
+
+ return
+ if $item->is_dir;
+
+ # /usr/share/fonts/X11
+ my ($subdir) = ($item->name =~ m{^usr/share/fonts/X11/([^/]+)/\S+});
+ if (defined $subdir) {
+
+ $self->fontdirs->{$subdir}++
+ if any { $subdir eq $_ } qw(100dpi 75dpi misc);
+
+ if (any { $subdir eq $_ } qw(PEX CID Speedo cyrillic)) {
+ $self->pointed_hint('file-in-discouraged-x11-font-directory',
+ $item->pointer);
+
+ } elsif (none { $subdir eq $_ }
+ qw(100dpi 75dpi misc Type1 encodings util)) {
+ $self->pointed_hint('file-in-unknown-x11-font-directory',
+ $item->pointer);
+
+ } elsif ($item->basename eq 'encodings.dir'
+ or $item->basename =~ m{fonts\.(dir|scale|alias)}) {
+ $self->pointed_hint('package-contains-compiled-font-file',
+ $item->pointer);
+ }
+ }
+
+ return;
+}
+
+sub installable {
+ my ($self) = @_;
+
+ # X11 font directories with files
+ my %fontdirs = %{$self->fontdirs};
+
+ # check for multiple DPIs in the same X11 bitmap font package.
+ $self->hint('package-contains-multiple-dpi-fonts')
+ if $fontdirs{'100dpi'} && $fontdirs{'75dpi'};
+
+ $self->hint('package-mixes-misc-and-dpi-fonts')
+ if $fontdirs{misc} && keys %fontdirs > 1;
+
+ return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et