sway: Make desktop-monitor assignment configurable

home-manager/modules/sway/default.nix

@@ -45,6 +45,25 @@ in
         };
       });
     };
+    workspaceOutputs = mkOption {
+      description = "Assign workspaces to outputs";
+      type = types.listOf (types.submodule {
+        options = {
+          output = mkOption {
+            description = "Name(s) of the output to assign";
+            type = with types; either str (listOf str);
+            apply = lists.toList;
+            default = "";
+          };
+          workspace = mkOption {
+            description = "Name of the workspace to assign";
+            type = types.str;
+            default = "";
+          };
+        };
+      });
+      default = [ ];
+    };
   };
 
   config = mkIf cfg.enable {
@@ -102,6 +121,8 @@ in
 
         defaultWorkspace = "workspace number 1";
 
+        workspaceOutputAssign = cfg.workspaceOutputs;
+
         left = "n";
         down = "e";
         up = "i";