make extendable using merge

common/home.nix

@@ -156,66 +156,70 @@ in
 
   systemd.user = {
     enable = enableGraphical;
+    startServices = "sd-switch";
 
-    services = builtins.listToAttrs (
+    services = lib.mkMerge [
-      builtins.map (
-        {
-          name,
-          horizontal,
-          vertical,
-          ...
-        }:
-        let
-          display_config =
-            let
-              display-shader = pkgs.substituteAll {
-                src = ../modules/automapaper/display-with_vars.glsl;
-                background = inputs.nix-colors.lib.conversions.hexToGLSLVec "0a000a";
-                foreground = inputs.nix-colors.lib.conversions.hexToGLSLVec "192291";
-              };
-              state-shader = ../modules/automapaper/state-game_of_life.glsl;
-              init-shader = ../modules/automapaper/init.glsl;
-              # General configurations
-              cycles = 2000;
-              tps = 30;
-              horizontal-dot-size = 10;
-              vertical-dot-size = 10;
-            in
-            (import ../modules/automapaper/config.nix {
-              inherit (pkgs) writeTextFile;
-              inherit
-                init-shader
-                state-shader
-                display-shader
-                tps
-                cycles
-                ;
-              display = name;
-              horizontal = builtins.div horizontal horizontal-dot-size;
-              vertical = builtins.div vertical vertical-dot-size;
-            });
 
-        in
+      (builtins.listToAttrs (
-        lib.attrsets.nameValuePair "automapaper-${name}" ({
+        builtins.map (
-          Install = {
+          {
-            WantedBy = [ "niri.service" ];
+            name,
-          };
+            horizontal,
-          Unit = {
+            vertical,
-            Description = "Automapaper for display ${name}";
+            ...
-            PartOf = "graphical-session.target";
+          }:
-            After = "graphical-session.target";
+          let
-            Requisite = "graphical-session.target";
+            display_config =
-          };
+              let
+                display-shader = pkgs.substituteAll {
+                  src = ../modules/automapaper/display-with_vars.glsl;
+                  background = inputs.nix-colors.lib.conversions.hexToGLSLVec "0a000a";
+                  foreground = inputs.nix-colors.lib.conversions.hexToGLSLVec "192291";
+                };
+                state-shader = ../modules/automapaper/state-game_of_life.glsl;
+                init-shader = ../modules/automapaper/init.glsl;
+                # General configurations
+                cycles = 2000;
+                tps = 30;
+                horizontal-dot-size = 10;
+                vertical-dot-size = 10;
+              in
+              (import ../modules/automapaper/config.nix {
+                inherit (pkgs) writeTextFile;
+                inherit
+                  init-shader
+                  state-shader
+                  display-shader
+                  tps
+                  cycles
+                  ;
+                display = name;
+                horizontal = builtins.div horizontal horizontal-dot-size;
+                vertical = builtins.div vertical vertical-dot-size;
+              });
 
-          Service = {
+          in
-            ExecStart = "${
+          lib.attrsets.nameValuePair "automapaper-${name}" ({
-              inputs.automapaper.packages.${pkgs.system}.automapaper
+            Install = {
-            }/bin/automapaper -C ${display_config}/config.toml";
+              WantedBy = [ "niri.service" ];
-            Restart = "on-failure";
+            };
-          };
+            Unit = {
-        })
+              Description = "Automapaper for display ${name}";
-      ) displays
+              PartOf = "graphical-session.target";
-    );
+              After = "graphical-session.target";
+              Requisite = "graphical-session.target";
+            };
+
+            Service = {
+              ExecStart = "${
+                inputs.automapaper.packages.${pkgs.system}.automapaper
+              }/bin/automapaper -C ${display_config}/config.toml";
+              Restart = "on-failure";
+            };
+          })
+        ) displays
+      ))
+    ];
   };
 
   xdg = {