feat: scratchpads

module.nix

@@ -8,9 +8,12 @@ let
   inherit (lib)
     mkEnableOption
     mkPackageOption
+    mkOption
     mkIf
     getExe
+    types
     ;
+  inherit (types) attrsOf bool;
   name = "Niri Tag Manager";
 in
 {
@@ -20,6 +23,18 @@ in
       nullable = true;
       default = "niri-tag";
     };
+    prepopulate = mkOption {
+      type = types.numbers.between 0 255;
+      default = 3;
+    };
+    scratchpads = mkOption {
+      type = attrsOf (types.numbers.between 1 255);
+      default = { };
+    };
+    strict = mkOption {
+      type = bool;
+      default = true;
+    };
   };
   config =
     let
@@ -40,6 +55,22 @@ in
           PrivateTmp = true;
         };
       };
+      etc.environment."/etc/niri-tag/config.toml" =
+        let
+          scratchpads =
+            let
+              contents = lib.mapAttrsToList (app: number: "${app} = ${toString number}\n") cfg.scratchpads;
+            in
+            lib.optionalString (lib.count <| lib.attrsToList cfg.scratchpads) ''
+              [scratchpads]
+              ${contents}
+            '';
+        in
+        pkgs.writeTextFile "config.toml" ''
+          prepopulate = ${toString cfg.prepopulate}
+          strict = ${lib.boolToString cfg.strict}
+          ${scratchpads}
+        '';
       environment.systemPackages = [ cfg.package ];
     };
 }