#!/usr/bin/perl

=pod

=head1 NAME $RCSfile: setbg,v $

Set background

=head1 VERSION

=over

=item Author

Andrew DeFaria <Andrew@ClearSCM.com>

=item Revision:

$Revision: 1.10 $

=item Created:

Fri Mar 18 01:14:38 PST 2005

=item Modified:

$Date: 2012/11/09 15:31:30 $

=back

=head1 SYNOPSIS

 Usage: setbg [-u|sage] [-ve|rbose] [-d|ebug] [-s|leep <n>] [-bgdir <bgdir>]
 
 Where:

 -u|sage:     Displays this usage
 -ve|rbose:   Be verbose
 -d|ebug:     Output debug messages

 -s|leep:     Number of minutes to sleep between setting the background
             (Default: 1 hour)
 -b|gdir:     Directory to scan for images (Default: /web/Pictures)

=head1 DESCRIPTION

This script sets the background image randomly based on images $imgDir. Note
if this script is run again it senses that it was previously run and sends the
previous script a SIGUSR2 which the script intrprets as "Change the background
now", then exits.

=cut

use strict;
use warnings;

use FindBin;
use Getopt::Long;
use Proc::ProcessTable;
use File::Spec;
use CGI qw/:standard/;

use lib "$FindBin::Bin/../lib";

use DateUtils;
use Display;
use Utils;

my $VERSION  = '$Revision: 1.10 $';
  ($VERSION) = ($VERSION =~ /\$Revision: (.*) /);

my $processes = new Proc::ProcessTable;
my @imgDirs;

foreach my $process (@{$processes->table}) {
  if ($process->cmndline =~ /setbg/ and
      $process->pid != $$) { 
    kill 12, $process->pid;

    exit 0;
  } # if
} # foreach

sub fillPictures () {
  my @images;
  
  foreach (@imgDirs) {
    my @pics = `find "$_" -type f -name "*.jpg"`;
    
    chomp @pics;
    push @images, @pics;
  } # foreach

  return @images;  
} # fillPictures

$0 = "$FindBin::Script " . join ' ', @ARGV;

verbose "$FindBin::Script v$VERSION";

my $sleep  = 60 * 60;

GetOptions (
  'usage'   => sub { Usage },
  'verbose' => sub { set_verbose },
  'debug'   => sub { set_debug },
  'sleep=i' => \$sleep,
  'bgdir=s' => \@imgDirs,
) || Usage;

for (my $i = 0; $i < scalar @imgDirs; $i++) {
  error "$imgDirs[$i] is not a directory", 1 unless -d $imgDirs[$i];
  
  $imgDirs[$i] = File::Spec->rel2abs ($imgDirs[$i]);
} # foreach

# Using gsettings
my $setbg	    = "gsettings";
my $setbgOpts	= "set org.gnome.desktop.background picture-uri \"file://";

my @images = fillPictures;

Usage "No images to display. Must specify -bgdir" unless @images;
 
sub SwitchWallPaper {
  # We don't need to do anything here, just handle the interrupt and
  # let the while loop continue.
  debug 'SwitchWallPaper: Interrupt received';
} # SwitchWallPaper

$SIG{USR2} = \&SwitchWallPaper;
$SIG{USR1} = \&fillPictures;

my $debugger = $DB::OUT;
my $today;

EnterDaemonMode unless defined $DB::OUT;

while () {
  my $image = escapeHTML ($images[int (rand $#images)]);

  open my $log, '>', "$ENV{HOME}/.$FindBin::Script"
    or error "Unable to open $ENV{HOME}/.$FindBin::Script for writing - $!", 1;

  display $image, $log;

  my $cmd = "$setbg $setbgOpts$image\" 2> /dev/null";

  my @output = `$cmd`;

  if ($? != 0) {
    display "ERROR Trying to set background - command used \"$cmd\"", $log;
    display "Output:";
    display join "\n", @output, $log;
  } # if
  
  close $log;
  
  $today = YMD;  
  
  sleep $sleep;
  
  if ($today ne YMD){
    @images = fillPictures;
  } # if
} # while