keepassxc: add autostart option

modules/programs/keepassxc.nix

@@ -46,16 +46,36 @@ in
         for the full list of options.
       '';
     };
+
+    autostart = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = ''
+        Whether to start Keepassxc automatically on login through the XDG autostart mechanism.
+      '';
+    };
   };
 
   config = lib.mkIf cfg.enable (
     lib.mkMerge [
 
       {
-        xdg.configFile = {
-          "keepassxc/keepassxc.ini" = lib.mkIf (cfg.settings != { }) {
-            source = iniFormat.generate "keepassxc-settings" cfg.settings;
-          };
+        assertions = [
+          {
+            assertion = cfg.autostart -> config.xdg.autostart.enable;
+            message = ''
+              {option}`xdg.autostart.enable` has to be enabled in order for
+              {option}`programs.keepassxc.autostart` to be effective.
+            '';
+          }
+        ];
+
+        xdg.autostart.entries = lib.mkIf cfg.autostart [
+          "${cfg.package}/share/applications/org.keepassxc.KeePassXC.desktop"
+        ];
+        xdg.configFile."keepassxc/keepassxc.ini" = lib.mkIf (cfg.settings != { }) {
+          source = iniFormat.generate "keepassxc-settings" cfg.settings;
         };
       }
 

tests/modules/programs/keepassxc/autostart.nix

@@ -0,0 +1,14 @@
+{
+  programs.keepassxc = {
+    enable = true;
+    autostart = true;
+  };
+  xdg.autostart.enable = false;
+
+  test.asserts.assertions.expected = [
+    ''
+      {option}`xdg.autostart.enable` has to be enabled in order for
+      {option}`programs.keepassxc.autostart` to be effective.
+    ''
+  ];
+}

tests/modules/programs/keepassxc/default.nix

@@ -1,4 +1,5 @@
 {
+  keepassxc-autostart = ./autostart.nix;
   keepassxc-default-settings = ./default-settings.nix;
   keepassxc-example-settings = ./example-settings.nix;
 }