backdrop has wallpaper now

modules/desktop/awww.nix

@@ -6,6 +6,7 @@ let
 in {
   options.modules.desktop.awww = {
     enable = mkEnableOption "Enable awww, an Answer to your Wayland Wallpaper Woes";
+    backdrop = mkEnableOption "Enable a second, blurred, awww daemon with a `-backdrop` suffix. Primarily for use in niri";
     package = mkOption {
       type = types.package;
       default = pkgs.awww;
@@ -16,6 +17,11 @@ in {
       default = "${pkgs.my.wallpapers}/share/backgrounds";
       example = "$XDG_PICTURES_DIR/wallpapers";
     };
+    wallpaperEffectsCacheFolder = mkOption {
+      type = types.str;
+      default = "$XDG_CACHE_HOME/wallpaper-blurcache";
+      example = "$XDG_CACHE_HOME/wallpaper-blurcache";
+    };
     lastWallpaper = mkOption {
       type = types.str;
       default = "$XDG_DATA_HOME/awww-last-wallpaper";
@@ -26,6 +32,28 @@ in {
       default = "$XDG_DATA_HOME/awww-last-wallpaper-sym";
       example = "$XDG_DATA_HOME/awww-last-wallpaper-sym";
     };
+    # TODO: somehow make this match up with the theme blur radius when i add that?
+    blurScript = mkOption {
+      type = types.package;
+      default = pkgs.writeShellScript "awww-blur" ''
+        set -euo pipefail
+
+        : "''${1:?missing argument}"
+
+        mkdir -p "${cfg.wallpaperEffectsCacheFolder}"
+        blurred="${cfg.wallpaperEffectsCacheFolder}/$(basename "$1")"
+
+        if [ ! -f "$blurred" ]; then
+          ${lib.getExe pkgs.imagemagick} "$1" \
+            -blur 0x8 \
+            -fill black \
+            -colorize 40% \
+            "$blurred"
+        fi
+
+        echo "$blurred"
+      '';
+    };
     setScript = mkOption {
       type = types.package;
       default = pkgs.writeShellScript "awww-set" ''
@@ -35,8 +63,12 @@ in {
           echo "$(ls ${cfg.wallpapersFolder} | shuf -n 1)" > "${cfg.lastWallpaper}"
         fi
 
-        ln -sf "${cfg.wallpapersFolder}/$(cat ${cfg.lastWallpaper})" "${cfg.lastWallpaperSym}" # in case the hash of the pkg changes
-        ${lib.getExe cfg.package} img "${cfg.wallpapersFolder}/$(cat ${cfg.lastWallpaper})" --transition-type none
+        wallpaper="${cfg.wallpapersFolder}/$(cat ${cfg.lastWallpaper})"
+
+        ln -sf "$wallpaper" "${cfg.lastWallpaperSym}"
+
+        ${lib.getExe cfg.package} img "$wallpaper" --transition-type none
+        ${lib.optionalString cfg.backdrop ''${lib.getExe cfg.package} img $(${cfg.blurScript} "$wallpaper") --namespace backdrop --transition-type none''}
       '';
     };
     swapScript = mkOption {
@@ -50,6 +82,7 @@ in {
         [ ! -f "$wallpaper" ] && exit 1
 
         ${lib.getExe cfg.package} img "$wallpaper" --transition-type grow --transition-fps 60 --transition-pos 1.0,1.0 --transition-duration 1.5
+        ${lib.optionalString cfg.backdrop ''${lib.getExe cfg.package} img $(${cfg.blurScript} "$wallpaper") --namespace backdrop --transition-type grow --transition-fps 60 --transition-pos 1.0,1.0 --transition-duration 1.5''}
 
         ln -sf "$wallpaper" "${cfg.lastWallpaperSym}"
         echo "$file" > "${cfg.lastWallpaper}"
@@ -57,26 +90,61 @@ in {
     };
   };
 
-  config = mkIf cfg.enable {
-    hm.home.packages = [ cfg.package ];
-    hm.systemd.user.services.awww = {
-      Unit = {
-        Description = "awww, an Answer to your Wayland Wallpaper Woes";
-        After = [ "graphical-session-pre.target" ];
-        PartOf = [ "graphical-session.target" ];
-      };
+  config = mkMerge [
+    (mkIf cfg.enable {
+      hm.home.packages = [ cfg.package ];
+      hm.systemd.user.services.awww = {
+        Unit = {
+          Description = "awww, an Answer to your Wayland Wallpaper Woes";
+          After = [ "graphical-session-pre.target" ];
+          PartOf = [ "graphical-session.target" ];
+        };
 
-      Install = {
-        WantedBy = [ "graphical-session.target" ];
-      };
+        Install = {
+          WantedBy = [ "graphical-session.target" ];
+        };
 
-      Service = {
-        Type = "simple";
-        ExecStart = "${cfg.package}/bin/awww-daemon";
-        ExecStartPost = "${cfg.setScript}";
-        Restart = "on-failure";
-        RestartSec = 5;
+        Service = {
+          Type = "simple";
+          ExecStart = "${cfg.package}/bin/awww-daemon";
+          Restart = "on-failure";
+          RestartSec = 5;
+        };
       };
-    };
-  };
+      hm.systemd.user.services.awww-set = {
+        Unit = {
+          Description = "awww, an Answer to your Wayland Wallpaper Woes (startup script)";
+          After = [ "awww.service" ] ++ optional cfg.backdrop "awww-backdrop.service";
+          PartOf = [ "awww.service" ] ++ optional cfg.backdrop "awww-backdrop.service";
+        };
+
+        Service = {
+          Type = "oneshot";
+          ExecStart = "${cfg.setScript}";
+          Restart = "on-failure";
+          RestartSec = 2;
+        };
+      };
+    })
+    (mkIf cfg.backdrop {
+      hm.systemd.user.services.awww-backdrop = {
+        Unit = {
+          Description = "awww, an Answer to your Wayland Wallpaper Woes";
+          After = [ "graphical-session-pre.target" ];
+          PartOf = [ "graphical-session.target" ];
+        };
+
+        Install = {
+          WantedBy = [ "graphical-session.target" ];
+        };
+
+        Service = {
+          Type = "simple";
+          ExecStart = "${cfg.package}/bin/awww-daemon --namespace backdrop";
+          Restart = "on-failure";
+          RestartSec = 5;
+        };
+      };
+    })
+  ];
 }