flake: add standalone template

flake/templates/standalone/flake.nix

@@ -0,0 +1,64 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nvf.url = "github:notashelf/nvf";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    ...
+  } @ inputs: let
+    # An abstraction over systems to easily provide the same package
+    # for multiple systems. This is preferable to abstraction libraries.
+    forEachSystem = nixpkgs.lib.genAttrs ["x86_64-linux"];
+  in {
+    packages = forEachSystem (system: let
+      pkgs = inputs.nixpkgs.legacyPackages.${system};
+
+      # A module to be evaluated via lib.evalModules inside nvf's module system.
+      # All options supported by nvf will go under config.vim to create the final
+      # wrapped package. You may also add some new *options* under options.* to
+      # expand the module system.
+      configModule = {
+        # You may browse available options for nvf on the online manual. Please see
+        # <https://notashelf.github.io/nvf/options.html>
+        config.vim = {
+          theme.enable = true;
+
+          # Language support and automatic configuration of companion plugins.
+          # Note that enabling, e.g., languages.<lang>.diagnostics will automatically
+          # enable top-level options such as enableLSP or enableExtraDiagnostics as
+          # they are needed.
+          languages = {
+            enableLSP = true;
+            enableFormat = true;
+            enableTreesitter = true;
+            enableExtraDiagnostics = true;
+
+            # Nix language and diagnostics.
+            nix.enable = true;
+          };
+        };
+      };
+
+      # Evaluate any and all modules to create the wrapped Neovim package.
+      neovimConfigured = inputs.nvf.lib.neovimConfiguration {
+        inherit pkgs;
+
+        modules = [
+          # Configuration module to be imported. You may define multiple modules
+          # or even import them from other files (e.g., ./modules/lsp.nix) to
+          # better modularize your configuration.
+          configModule
+        ];
+      };
+    in {
+      # Packages to be exposed under packages.<system>. Those can accessed
+      # directly from package outputs in other flakes if this flake is added
+      # as an input. You may run those packages with 'nix run .#<package>'
+      default = self.packages.${system}.neovim;
+      neovimConfigured = neovimConfigured.neovim;
+    });
+  };
+}