add nixos-mods/improvedDefaults

nix/nixos-modules/allCommon.nix

@@ -154,6 +154,13 @@ in {
     };
 
 
+    x-banananetwork = {
+
+      improvedDefaults.enable = true;
+
+    };
+
+
   };
 
 

nix/nixos-modules/default.nix

@@ -4,6 +4,7 @@
   imports = [
     # directories
     ./frontend
+    ./improvedDefaults
     # files
     ./allCommon.nix
     ./autoUnfree.nix

nix/nixos-modules/improvedDefaults/command-not-found.nix

@@ -0,0 +1,30 @@
+{ config
+, lib
+, pkgs
+, ...
+}:
+let
+  cfg = config.x-banananetwork.improvedDefaults;
+in
+{
+
+
+  config = lib.mkIf cfg.enable (
+    let
+      nixI = config.programs.nix-index;
+      shellInt = builtins.any (x: x) (with nixI;
+        [
+          enableBashIntegration
+          enableZshIntegration
+        ]);
+      nixIclash = nixI.enable && shellInt;
+    in
+    {
+
+      programs.command-not-found.enable = lib.mkIf nixIclash false;
+
+    }
+  );
+
+
+}

nix/nixos-modules/improvedDefaults/default.nix

@@ -0,0 +1,35 @@
+{ config
+, lib
+, pkgs
+, ...
+}:
+let
+  cfg = config.x-banananetwork.improvedDefaults;
+in
+{
+
+
+  imports = [
+    ./command-not-found.nix
+  ];
+
+
+  options = {
+
+    x-banananetwork.improvedDefaults = {
+
+      enable = lib.mkEnableOption ''
+        improved defaults for nixpkgs NixOS modules.
+
+        Defaults are only changed conditionally,
+        e.g. modules, which are enabled by default,
+        get automatically disabled
+        if another incompatible module is enabled.
+      '';
+
+    };
+
+  };
+
+
+}