feat: nixos module

flake.nix

@@ -45,6 +45,11 @@
       };
       default = self.packages."${pkgs.system}".neovim;
     });
+
+    nixosModules = {
+      neovim = import ./nixos.nix {inherit self;};
+      default = self.nixosModules.neovim;
+    };
     homeManagerModules = {
       neovim = import ./nixos.nix {inherit self;};
       default = self.homeManagerModules.neovim;

nixos.nix

@@ -0,0 +1,33 @@
+{self}: {
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  neovim = self.packages.${pkgs.system}.default;
+  cfg = config.neovim;
+in
+  with lib; {
+    options = {
+      enable = mkOption {
+        type = with types; bool;
+        default = true;
+      };
+      package = mkOption {
+        type = with types; package;
+        default = neovim;
+      };
+      defaultEditor = mkOption {
+        type = with types; bool;
+        default = true;
+      };
+    };
+    config = mkIf cfg.enable {
+      environment.variables = {EDITOR = "nvim";};
+
+      environment.systemPackages = [cfg.package];
+
+      # Disable NixOS's Neovim
+      programs.neovim.enable = mkForce false;
+    };
+  }