From http://www.jwz.org/xscreensaver/xscreensaver-5.35.tar.gz

[xscreensaver] / OSX / seticon.pl

diff --git a/OSX/seticon.pl b/OSX/seticon.pl
new file mode 100755 (executable)
index 0000000..69faf68
--- /dev/null
+++ b/OSX/seticon.pl
@@ -0,0 +1,102 @@
+#!/usr/bin/perl -w
+# Copyright © 2015 Dave Odell <dmo2118@gmail.com>
+#
+# 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.
+
+# This is a replacement for seticon from http://osxutils.sourceforge.net/.
+
+require 5;
+use diagnostics;
+use strict;
+#use IPC::Open2;
+use File::Temp;
+
+my $progname = $0; $progname =~ s@.*/@@g;
+my ($version) = ('$Revision: 1.4 $' =~ m/\s(\d[.\d]+)\s/s);
+
+my $verbose = 0;
+
+sub set_icon ($$) {
+  my ($icon, $target) = @_;
+  my $target_res = $target;
+
+  if (-d $target) {
+    $target_res = $target_res . "/Icon\r";
+  }
+
+  # Rez hates absolute paths, apparently.
+  if ($icon =~ m@^/@s) {
+    my $cwd = `pwd`;
+    chomp $cwd;
+    $icon =~ s@^\Q$cwd/@@s;
+  }
+
+  # The Rez language is documented in "Building and Managing Programs in MPW,
+  # Second Edition". No longer available on Apple's servers, it can now be
+  # found at:
+  # http://www.powerpc.hu/manila/static/home/Apple/developer/Tool_Chest/Core_Mac_OS_Tools/MPW_etc./Documentation/MPW_Reference/Building_Progs_In_MPW.sit.hqx
+
+  my $pgm = "Read 'icns' (kCustomIconResource) \"$icon\";\n";
+
+  # Rez can read from stdin, but only if it is a file handle, not if it
+  # is a pipe (OS X 10.9, Xcode 5; OSX 10.11, Xcode 6).
+
+  my ($rez_fh, $rez_filename) = File::Temp::tempfile(DIR => '.', UNLINK => 1);
+  print $rez_fh $pgm;
+  close $rez_fh;
+
+  my @cmd = ('Rez',
+             'CoreServices.r',
+             $rez_filename,
+             '-o', $target_res);
+
+  print STDERR "$progname: exec: " . join(' ', @cmd) . "\n$pgm\n"
+    if ($verbose);
+
+#  my ($in, $out);
+#  my $pid = open2 ($out, $in, @cmd);
+#  print $in $pgm;
+#  close ($in);
+#  waitpid ($pid, 0);
+
+  system (@cmd);
+
+  my $exit  = $? >> 8;
+  exit ($exit) if $exit;
+
+  # Have to also inform Finder that the icon is there, with the
+  # com.apple.FinderInfo xattr (a FolderInfo struct).
+  @cmd = ('SetFile', '-a', 'C', $target);
+  system (@cmd);
+  $exit  = $? >> 8;
+  exit ($exit) if $exit;
+}
+
+sub usage() {
+  print "Usage: $progname -d source [file...]\n";
+  exit 1;
+}
+
+sub main() {
+  my ($d, $src, $dst);
+  while ($#ARGV >= 0) {
+    $_ = shift @ARGV;
+    if (m/^--?verbose$/s)      { $verbose++; }
+    elsif (m/^-v+$/s)          { $verbose += length($_)-1; }
+    elsif (m/^-d$/s)           { $d = 1; }
+    elsif (!defined($src))     { $src = $_; }
+    elsif (!defined($dst))     { $dst = $_; }
+    else { usage; }
+  }
+  usage() unless ($d && $src);
+  set_icon ($src, $dst);
+}
+
+main();
+exit 0;