Wallpaper rotation script
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#!/usr/bin/env perl
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use strict;
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use warnings;
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use lib "$ENV{HOME}/perl5/lib/perl5";
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our $debug = 1; # For testing, will output configuration and errors if true
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use AnyEvent::Sway;
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our $s = AnyEvent::Sway->new();
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our $o = $s->get_outputs->recv();
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die "No outputs detected.\n" unless (scalar(@$o) > 1);
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sub usage()
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{
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print("$0 [output(s)] [-d|--daemon]\n
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Sets a wallpaper by cropping an appropriate sized section of a larger image.\n
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All arguments other than the below are assumed to be output names, as defined
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in my sway/displays.pl script. If no outputs are provided, all available that
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are currently enabled will be set.\n
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--path=<path> Path to wallpaper directory.
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-p <path> Default: $ENV{HOME}/wallpapers\n
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--daemon=N Configures the wallpaper to be periodically rotated for all
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-d N of the given outputs. N indicates the number of seconds between
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each rotation, if provided (default: 300).\n
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--help This menu
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-h\n");
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exit(0);
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}
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$SIG{USR1} = sub {
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# TODO: Update the timeout method so that the daemon will simply run the job as a function.
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# when SIGUSR1 is received, force the alarm to expire immediately in order to rotate the image without delay.
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print "This should rotate the image, but it doesn't yet";
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};
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$SIG{TERM} = sub {
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clean();
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exit(0);
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};
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$SIG{INT} = sub {
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clean();
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exit(0);
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};
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sub clean
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{
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my $pidfile = "/var/run/$ENV{HOME}-wallpaper.pid";
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if (-e $pidfile) {
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open (my $fh, '<', $pidfile);
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my $p = <$fh>;
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chomp $p;
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kill($p);
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unlink($pidfile);
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}
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}
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sub choose_image
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{
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my $path = shift;
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my @w = glob("$path/*");
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return undef unless (scalar(@w));
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my @i;
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foreach (@w) {
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if (-d "$path/$_") {
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next;
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}
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if ($_ =~ m/\.(png|jpg)$/) {
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push(@i,$_);
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}
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}
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return $i[rand(scalar(@i))] || return undef;
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}
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sub get_size
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{
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my $target = shift;
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foreach my $output (@$o) {
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if ($output->{'name'} eq $target) {
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return (
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#$output->{'current_mode'}->{'width'},
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#$output->{'current_mode'}->{'height'}
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$output->{'rect'}->{'width'},
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$output->{'rect'}->{'height'}
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);
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}
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}
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return undef;
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}
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sub crop
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{
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my $image = shift;
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my $ow = shift;
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my $oh = shift;
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my $cropped = $image;
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$cropped =~ s#^.*/([^/]*)\.([^\.]+)$#$1-cropped.$2#;
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use Image::Magick;
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my $im = Image::Magick->new();
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$im->Read($image);
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my ($iw, $ih) = $im->Get("columns", "rows");
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# Return full size if it is smaller in either dimension then the output
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if ($iw < $ow || $ih < $oh) {
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print "Not cropping $image because it is too small\n";
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$cropped =~ s#-cropped\.([^\.]+)$#\.$1#;
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use File::Copy;
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File::Copy::copy($image,$cropped);
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return $cropped if (-e $cropped);
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return undef;
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}
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print "Image size: $iw $ih\n";
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print "output size: $ow $oh\n";
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my ($x, $y);
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$x = int(rand($iw-$ow));
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$y = int(rand($ih-$oh));
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print "Cropping $image ${ow}x${oh}+${x}+${y}\n";
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my $err = $im->Crop(geometry=>"${ow}x${oh}+${x}+${y}");
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die "$err" if ($err);
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print "Writing $cropped\n";
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$err = $im->Write($cropped);
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die "$err" if ($err);
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return $cropped if ( -e $cropped );
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}
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sub get_active
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{
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my @targets;
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foreach (@$o) {
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push (@targets, $_->{name});
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}
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return @targets;
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}
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sub set_background
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{
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my $target = shift || return "No target or image provided";
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my $cropped = shift || return "No image provided";
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# TODO get fallback from javascript
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my $cmd = "output $target background $cropped fill #000000";
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print "Running $cmd\n";
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my $ret = $s->message(0,$cmd)->recv;
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if ($ret->[0]->{success}) {
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print "Success!\n";
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return undef;
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}
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return "Failed to run Sway IPC command '$cmd'";
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}
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my @targets;
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my $daemon = 0;
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my $delay = 300;
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my $crop = 1;
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my $path;
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while (my $arg = shift(@ARGV)) {
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if ($arg eq '-h' || $arg eq '--help') {
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usage();
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} elsif ($arg =~ m/^\-\-path=?(.+)$/) {
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die "Redundant argument '$arg'. Wallpaper path already set.\n" if ($path);
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$path = $1;
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} elsif ($arg eq '-p') {
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die "Redundant argument '$arg'. Wallpaper path already set.\n" if ($path);
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$path = shift(@ARGV);
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} elsif ($arg =~ m/^\-\-daemon=?(.+)$/) {
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die "Redundant argument '$arg'. Daemon mode already set.\n" if ($daemon);
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$delay = $1;
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$daemon = 1;
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} elsif ($arg eq '-d') {
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die "Redundant argument '$arg'. Daemon mode already set.\n" if ($daemon);
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if ($ARGV[0] =~ m/^\d+$/) {
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$delay = shift(@ARGV);
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}
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$daemon = 1;
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} elsif ($arg eq '--nocrop' || $arg eq '-') {
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die "Redundant argument '$arg'. No-crop already set.\n" unless ($crop);
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} else {
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push(@targets,$arg);
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}
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}
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die "Invalid rotation delay: $delay" unless ($delay =~ m/^\d+$/);
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if ($path) {
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die "Invalid wallpaper path '$path'. Not a directory." unless (-d $path);
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} else {
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$path = "$ENV{HOME}/wallpapers";
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}
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if (scalar(@targets)) {
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my @kept;
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foreach my $t (@targets) {
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my $hit = 0;
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foreach (@$o) {
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if ($_->{name} eq $t) {
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push(@kept, $t);
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$hit++;
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last;
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}
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}
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print STDERR "Requested output '$t' not found\n" unless ($hit);
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}
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die "None of the requested outputs are active" unless (scalar(@kept));
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@targets = @kept;
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}
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if ($daemon) {
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my $p = fork();
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if ($p) {
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my $pidfile = "/var/run/$ENV{HOME}-wallpaper.pid";
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open(my $fh, ">", $pidfile) || die "Failed to open pidfile: $pidfile";
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print $fh "Daemonized as PID: $p\n" || die "Failed to write pid ($p) to pidfile $pidfile";
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close($fh);
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exit(0);
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}
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}
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if ($debug) {
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print "Initial configuration:\n";
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print " Targets: ( " . ( join(" ",@targets) || "All active" ) . " )\n";
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print " Daemon: $daemon\n";
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print " Path: $path\n";
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}
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my @e;
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do {
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my @err;
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# Local copy of targets so that it will re-check active every time
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my @t = @targets;
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unless (scalar(@t)) {
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@t = get_active();
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push(@err, "No target outputs") unless (scalar(@t));
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}
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foreach my $a (@t) {
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my $image = choose_image($path);
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if (defined($image)) {
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if ( -r "$image" ) {
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print "selected $image\n";
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my $cropped;
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if ($crop) {
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if ($debug) {
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print "Cropping image for '$a' using '$image'\n";
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}
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my ($ow, $oh) = get_size($a);
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$cropped = crop($image, $ow, $oh);
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unless ($cropped) {
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push(@err, "Failed to generate cropped image") unless ($cropped);
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next;
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}
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} else {
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$cropped = $image;
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}
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my $e = set_background($a,$cropped);
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push(@err, $e) if (defined($e));
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if ($crop) {
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print "Deleting $cropped\n";
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#unlink($cropped) || push(@err, "Failed to delete $cropped after setting: $!");
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}
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} else {
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push(@err, "$a: Unable to read image $image");
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}
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} else {
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push(@err, "$a: Unable to select image from $path");
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}
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}
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if ($debug && $daemon) {
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print STDERR join("\n",@err);
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sleep($delay);
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} else {
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@e = @err;
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}
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} while ($daemon);
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if (scalar(@e)) {
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die "Failure while not running as daemon:\n" .
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join("\n",@e);
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}
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exit(0);
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