From http://www.jwz.org/xscreensaver/xscreensaver-5.19.tar.gz

[xscreensaver] / OSX / update-thumbnail.pl

diff --git a/OSX/update-thumbnail.pl b/OSX/update-thumbnail.pl
new file mode 100755 (executable)
index 0000000..bd4e128
--- /dev/null
+++ b/OSX/update-thumbnail.pl
@@ -0,0 +1,150 @@
+#!/usr/bin/perl -w
+# Copyright © 2006-2012 Jamie Zawinski <jwz@jwz.org>
+#
+# Permission to use, copy, modify, distribute, and sell this software and its
+# documentation for any purpose is hereby granted without fee, provided that
+# the above copyright notice appear in all copies and that both that
+# copyright notice and this permission notice appear in supporting
+# documentation.  No representations are made about the suitability of this
+# software for any purpose.  It is provided "as is" without express or 
+# implied warranty.
+#
+# Converts and installs a thumbnail image inside a .saver bundle.
+#
+# Created:  26-Jul-2012.
+
+require 5;
+#use diagnostics;      # Fails on some MacOS 10.5 systems
+use strict;
+
+my $progname = $0; $progname =~ s@.*/@@g;
+my $version = q{ $Revision: 1.22 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
+
+my $verbose = 1;
+
+
+sub safe_system(@) {
+  my @cmd = @_;
+  system (@cmd);
+  my $exit_value  = $? >> 8;
+  my $signal_num  = $? & 127;
+  my $dumped_core = $? & 128;
+  error ("$cmd[0]: core dumped!") if ($dumped_core);
+  error ("$cmd[0]: signal $signal_num!") if ($signal_num);
+  error ("$cmd[0]: exited with $exit_value!") if ($exit_value);
+}
+
+
+# Returns true if the two files differ (by running "cmp")
+#
+sub cmp_files($$) {
+  my ($file1, $file2) = @_;
+
+  my @cmd = ("cmp", "-s", "$file1", "$file2");
+  print STDERR "$progname: executing \"" . join(" ", @cmd) . "\"\n"
+    if ($verbose > 3);
+
+  system (@cmd);
+  my $exit_value  = $? >> 8;
+  my $signal_num  = $? & 127;
+  my $dumped_core = $? & 128;
+
+  error ("$cmd[0]: core dumped!") if ($dumped_core);
+  error ("$cmd[0]: signal $signal_num!") if ($signal_num);
+  return $exit_value;
+}
+
+
+sub update($$) {
+  my ($src_dir, $app_dir) = @_;
+
+  # Apparently Apple wants Resources/{thumbnail.png to be 90x58,
+  # and Resources/thumbnail@2x.png to be 180x116.  Let's just 
+  # make the former, but make it be the latter's size.
+  #
+  my $size = '180x116';
+
+  error ("$app_dir does not exist") unless (-d $app_dir);
+  error ("$app_dir: no name")
+    unless ($app_dir =~ m@/([^/.]+).(saver|app)/?$@x);
+  my $app_name = $1;
+
+  $app_dir =~ s@/+$@@s;
+  $app_dir .= "/Contents/Resources";
+
+  error ("$app_dir does not exist") unless (-d $app_dir);
+  my $target = "$app_dir/thumbnail.png";
+
+  $src_dir .= "/" unless ($src_dir =~ m@/$@s);
+  my $src_dir2 = "${src_dir}retired/";
+
+  $app_name =~ s/rdbomb/rd-bomb/si;   # sigh
+
+  my $img  = $src_dir  . lc($app_name) . ".jpg";
+  my $img2 = $src_dir2 . lc($app_name) . ".jpg";
+  $img = $img2 if (! -f $img && -f $img2);
+  error ("$img does not exist") unless (-f $img);
+
+  my $tmp = sprintf ("%s/thumb-%08x.png",
+                     ($ENV{TMPDIR} ? $ENV{TMPDIR} : "/tmp"),
+                     rand(0xFFFFFFFF));
+  my @cmd = ("convert",
+             $img, 
+             "-resize", $size . "^",
+             "-gravity", "center",
+             "-extent", $size,
+             $tmp);
+
+  print STDERR "$progname: exec: " . join(' ', @cmd) . "\n" 
+    if ($verbose > 2);
+  safe_system (@cmd);
+
+  if (! -s $tmp) {
+    unlink $tmp;
+    error ("failed: " . join(" ", @cmd));
+  }
+
+  if (! cmp_files ($tmp, $target)) {
+    unlink $tmp;
+    print STDERR "$progname: $target: unchanged\n" if ($verbose > 1);
+  } elsif (! rename ($tmp, $target)) {
+    unlink $tmp;
+    error ("mv $tmp $target: $!");
+  } else {
+    print STDERR "$progname: wrote $target\n" if ($verbose);
+  }
+}
+
+
+sub error($) {
+  my ($err) = @_;
+  print STDERR "$progname: $err\n";
+  exit 1;
+}
+
+sub usage() {
+  print STDERR "usage: $progname [--verbose] image-dir program.app ...\n";
+  exit 1;
+}
+
+sub main() {
+
+  my $src_dir;
+  my @files = ();
+  while ($_ = $ARGV[0]) {
+    shift @ARGV;
+    if    (m/^--?verbose$/s)  { $verbose++; }
+    elsif (m/^-v+$/)          { $verbose += length($_)-1; }
+    elsif (m/^--?q(uiet)?$/s) { $verbose = 0; }
+    elsif (m/^-/s)            { usage(); }
+    elsif (! $src_dir)        { $src_dir = $_; }
+    else                      { push @files, $_; }
+  }
+  usage() unless ($src_dir && $#files >= 0);
+  foreach (@files) {
+    update ($src_dir, $_);
+  }
+}
+
+main();
+exit 0;