Add nix home-manager option for adding plugins (#354)

* add plugins nix hm option

* add nix hm plugins option usage to readme

README.md

@@ -661,6 +661,16 @@ cp -R ./PLUGINS/ExampleEmojiPlugin ~/.config/DankMaterialShell/plugins
 
 **Only install plugins from TRUSTED sources.** Plugins execute QML and javascript at runtime, plugins from third parties should be reviewed before enabling them in dms.
 
+### nixOS - via home-manager
+
+Add the following to your home-manager config to install a plugin:
+
+```nix
+programs.dankMaterialShell.plugins = {
+    ExampleEmojiPlugin.src = "${inputs.dankMaterialShell}/PLUGINS/ExampleEmojiPlugin";
+};
+```
+
 ### Calendar Setup
 
 Sync your caldev compatible calendar (Google, Office365, etc.) for dashboard integration:

nix/default.nix

@@ -54,6 +54,23 @@ in {
         quickshell = {
             package = lib.mkPackageOption pkgs "quickshell" {};
         };
+        plugins = lib.mkOption {
+            type = attrsOf (types.submodule ({ config, ... }: {
+                options = {
+                    enable = lib.mkOption {
+                        type = types.bool;
+                        default = true;
+                        description = "Whether to link this plugin";
+                    };
+                    src = lib.mkOption {
+                        type = types.path;
+                        description = "Source to link to DMS plugins directory";
+                    };
+                };
+            }));
+            default = {};
+            description = "DMS Plugins to install";
+        };
     };
 
     config = lib.mkIf cfg.enable
@@ -73,6 +90,11 @@ in {
             };
         };
 
+        xdg.configFile = lib.mapAttrs' (name: plugin: {
+            name = "DankMaterialShell/plugins/${name}";
+            value.source = plugin.src;
+        }) (lib.filterAttrs (n: v: v.enable) cfg.plugins);
+
         home.packages =
             [
                 pkgs.material-symbols