From fffbb5d5e0107898a80a2cffcd4f77d8399f611d Mon Sep 17 00:00:00 2001
From: John Mertz <git@john.me.tz>
Date: Fri, 19 Apr 2024 15:10:54 -0600
Subject: [PATCH] Load cached outputs if none given

Fallback to all available outputs
---
 sway/wallpaper.pl | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/sway/wallpaper.pl b/sway/wallpaper.pl
index 18446e5..1ef0486 100755
--- a/sway/wallpaper.pl
+++ b/sway/wallpaper.pl
@@ -57,6 +57,7 @@ sub new($class, %args)
     $args{error} = ();
 
     $args{pidfile} = "$ENV{HOME}/.local/state/wallpaper.pid";
+    $args{outputfile} = "$ENV{HOME}/.local/state/wallpaper_outputs";
 
     return bless { %args };
 }
@@ -396,7 +397,7 @@ die "Invalid wallpaper path '$path'. Not a directory." if (defined($path) && !-d
 die "Invalid verbosity level: '$verbose'\n" if (defined($verbose) && $verbose !~ m/^[1-8]$/);
 
 $wp->do_log("LOG_DEBUG", "Configuring object");
-$wp->{targets}  = \@targets || undef;
+$wp->{targets}  = \@targets || \();
 $wp->{daemon}   = $daemon || 0;
 $wp->{path}     = $path || "$ENV{HOME}/wallpapers";
 $wp->{crop}     = $crop || 1;
@@ -405,6 +406,27 @@ $wp->{verbose}  = $verbose || 0;
 $wp->{recursive}= $recursive;
 $wp->{error}    = [];
 
+unless(defined($wp->{targets})) {
+    if (open(my $fh, '<', $wp->{outputfile})) {
+        $wp->do_log("LOG_DEBUG", "No outputs requested, using cache file $wp->{outputfile}\n");
+        while (my $o = <$fh>) {
+            chomp($o);
+            push (@{$wp->{targets}}, $o) if ($o);
+        }
+        $wp->do_log("LOG_DEBUG", "Found cached outputs: ".join(', ', @{$wp->{targets}})."\n") if (scalar(@{$wp->{targets}})."\n");
+    } else {
+        $wp->do_log("LOG_WARNING", "Failed to load $wp->{outputfile}\n");
+    }
+    unless (scalar(@{$wp->{targets}})) {
+        $wp->{'targets'} = \$wp->get_outputs();
+        if (scalar(@{$wp->{targets}})) {
+            $wp->do_log("LOG_WARNING", "Using all available outputs ".join(', ', @{$wp->{targets}})."\n");
+        } else {
+            $wp->do_log("LOG_INFO", "Failed to discover any available outputs.\n", 1);
+        }
+    }
+}
+
 ################################################################################
 # Fork if daemonized
 ################################################################################