#!/usr/bin/perl5.8.0 -w

# wmb_rotate.pl
# pod at tail

use strict;
use Cwd;
# use Module::Versions::Report;

my $dir      = '/usr/share/WindowMaker/Backgrounds';
my $linkname = '00rotation_image';
my $randfile = '';

print "Rotating WindowMaker background image... ";
chdir $dir or die "$!\n";
$randfile = RandFile($dir) until (-f $randfile && -B _);

if (-e $linkname){
  die "$!\n" unless (-l $linkname && -w _);
  unlink $linkname or die "$!\n";
}
symlink $randfile, $linkname or die "$!\n";
print "done.\n";

sub RandFile {
  opendir F, $_[0] or die "$!\n";
  my @F = grep { /^\w.*/ } readdir F;
  return $F[rand @F];
}


=head1 TITLE

 wmb_rotate.pl

=head1 SYNOPSIS

 Place script in /etc/init.d directory,
 symlink from /etc/rcS.d,
 point WindowMaker background image to $linkname

 Or call script from cron reboot job

=head1 DESCRIPTION

 Randomly rotate WindowMaker background images.

=head1 TODO

 Check for -f and -B from within &RandFile()
 ...profit!

=head1 UPDATE

 2004-03-15   12:35 CST
   Test against Perl 5.6.1
   Revise logic for checks - exists, writable, symlink
   Trivial code correction and pod tweaks
   Post to PM Snippets
   Rewrite as small script instead of one-liner

 2004-03-13
   Initial working code

=head1 TESTED

 Debian                    3.0r2
 Perl                      5.8.0  5.6.1
 strict                    1.02   1.01
 warnings                  1.00
 Cwd                       2.06   2.04
 Modules::Versions::Report 1.02

=head1 BUGS

 None that I know of

=head1 CREDITS

 Thanks to Corion, chip, theorbtwo, and dws
 for CB help in getting my brain back into perl mode with this.
 And to some guy named vroom.

 perl -e 'opendir F,".";@F=readdir F;print $F[rand @F];'
 ls -l | perl -e '@F=<>;print $F[rand @F];'

=head1 AUTHOR

 ybiC

=cut