refactor(hm/price): separate swww into its own module

users/price/conf/swww-wallpapers/default.nix

@@ -0,0 +1,84 @@
+{ pkgs, ... }:
+let
+  wallpapers = ./wallpapers;
+in
+{
+  home.packages = [ pkgs.swww ];
+  systemd.user = {
+    services = {
+      swww-daemon = {
+        Service =
+          let
+            cleanup-socket-script = pkgs.writeShellScript "swww-daemon-cleanup-socket" ''
+              # Remove the existing swww.socket if it exists, avoids some issues with swww-daemon
+              # startup where swww-daemon claims the address is already in use
+              if [[ -w "$XDG_RUNTIME_DIR/swww.socket" ]]; then
+                rm -f $XDG_RUNTIME_DIR/swww.socket || exit 1
+              fi
+            '';
+          in
+          {
+            RestartSec = 3;
+            PassEnvironment = [ "XDG_RUNTIME_DIR" ];
+            ExecStartPre = "${cleanup-socket-script}";
+            ExecStopPost = "${cleanup-socket-script}";
+            ExecStart = "${pkgs.swww}/bin/swww-daemon";
+          };
+        Install.WantedBy = [ "graphical-session.target" ];
+        Unit = {
+          Description = "Wayland Wallpaper Service";
+          PartOf = [ "graphical-session.target" ];
+          After = [ "graphical-session.target" ];
+        };
+      };
+      swww-watch-wallpapers = {
+        Service = {
+          RestartSec = 3;
+          Environment = [
+            "SWWW_TRANSITION_FPS=120"
+            "SWWW_TRANSITION_STEP=30"
+            "SWWW_TRANSITION_DURATION=0.75"
+          ];
+          ExecStart = "${
+            pkgs.writeShellApplication {
+              name = "swww-watch-wallpapers";
+              runtimeInputs = with pkgs; [
+                swww
+                coreutils
+              ];
+              text = ''
+                set -eEuo pipefail
+
+                main() {
+                  local prev_mons_connected=0
+                  local mons_connected=0
+                  local cached_swww_query
+
+                  while sleep 1; do
+                    cached_swww_query="$(swww query)"
+                    mons_connected="$(wc -l <<< "$cached_swww_query")"
+                    if ((mons_connected != prev_mons_connected)); then
+                      prev_mons_connected="$mons_connected"
+                      swww img -t random ${wallpapers}/Nebula.jpg
+                      if [[ "$cached_swww_query" =~ "eDP-1: "* ]]; then
+                        swww img -t wipe --transition-angle 40 -o eDP-1 ${wallpapers}/Autumn-Leaves.jpg
+                      fi
+                    fi
+                  done
+                }
+
+                main
+              '';
+            }
+          }/bin/swww-watch-wallpapers";
+        };
+        Install.WantedBy = [ "swww-daemon.service" ];
+        Unit = {
+          Description = "Wayland Wallpaper Service";
+          PartOf = [ "swww-daemon.service" ];
+          After = [ "swww-daemon.service" ];
+        };
+      };
+    };
+  };
+}

users/price/home.nix

@@ -152,12 +152,7 @@ in
       ]
       ++ [ rust-analyzer ];
 
-    file = {
-      ".local/share/wallpapers" = {
-        source = ./dots/.local/share/wallpapers;
-        force = true;
-      };
-    } // softLinkDots ".config";
+    file = softLinkDots ".config";
 
     sessionVariables = {
       _ZL_DATA = "${config.xdg.cacheHome}/zlua";
@@ -483,56 +478,6 @@ in
       };
     };
     services = {
-      swww-daemon = {
-        Service =
-          let
-            cleanup-socket-script = pkgs.writeShellScript "swww-daemon-cleanup-socket" ''
-              # Remove the existing swww.socket if it exists, avoids some issues with swww-daemon
-              # startup where swww-daemon claims the address is already in use
-              if [[ -w "$XDG_RUNTIME_DIR/swww.socket" ]]; then
-                rm -f $XDG_RUNTIME_DIR/swww.socket || exit 1
-              fi
-            '';
-          in
-          {
-            RestartSec = 3;
-            PassEnvironment = [ "XDG_RUNTIME_DIR" ];
-            ExecStartPre = "${cleanup-socket-script}";
-            ExecStopPost = "${cleanup-socket-script}";
-            ExecStart = "${pkgs.swww}/bin/swww-daemon";
-          };
-        Install.WantedBy = [ "compositor.target" ];
-        Unit = {
-          Description = "Wayland Wallpaper Service";
-          PartOf = [ "compositor.target" ];
-          After = [ "compositor.target" ];
-        };
-      };
-      swww-wallpapers = {
-        Service = {
-          RestartSec = 3;
-          Type = "oneshot";
-          Environment = [
-            "SWWW_TRANSITION_FPS=120"
-            "SWWW_TRANSITION_STEP=30"
-            "SWWW_TRANSITION_DURATION=0.75"
-          ];
-          ExecStart =
-            let
-              wallpaper-dir = "${dotsDir}/.local/share/wallpapers";
-            in
-            [
-              "${pkgs.swww}/bin/swww img -t random ${wallpaper-dir}/Nebula.jpg"
-              "${pkgs.swww}/bin/swww img -t wipe --transition-angle 40 -o eDP-1 ${wallpaper-dir}/Autumn-Leaves.jpg"
-            ];
-        };
-        Install.WantedBy = [ "swww-daemon.service" ];
-        Unit = {
-          Description = "Wayland Wallpaper Service";
-          PartOf = [ "swww-daemon.service" ];
-          After = [ "swww-daemon.service" ];
-        };
-      };
       keyd-application-mapper = {
         Unit = {
           Description = "Keyd - Linux Keyboard Remapper";