sway: Wrap swaybg in systemd-run

...to work around swaybg crashes

sway/.config/sway/config

@@ -222,6 +222,11 @@ bindsym $mod+r mode "resize"
 include /etc/sway/config.d/*
 include /home/peter/.config/sway/local.d/*
 
+# Wrap swaybg in systemd-run to allow swaybg to be automatically restarted
+# if it ever crashes. The wrapper script will also automatically purge old
+# processes of swaybg as needed.
+swaybg_command /home/peter/.local/bin/swaybg-systemd-wrapper
+
 output "*" bg $wallpaper fill
 
 # Lockscreen - requires jirutka/swaylock-effects

sway/.local/bin/swaybg-systemd-wrapper

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+args=()
+output_arg=
+
+while [ ! -z "$1" ]; do
+    if [ "$1" == "-o" ]; then
+        output_arg="$2"
+    fi
+    args+=("$1")
+    shift
+done
+
+[ -z "$output_arg" ] && exit 1
+
+if [ "$output_arg" == '*' ]; then
+    output_arg="all"
+fi
+
+systemctl --user stop "swaybg-$output_arg" >& /dev/null 2>&1 || true
+
+systemd-run --user --unit="swaybg-$output_arg" --property=Restart=on-failure --property=RestartSec=1 swaybg "${args[@]}"