feat(cli/nvf): add custom nix snippet for nvf

packages/snippets/default.nix

@@ -0,0 +1,8 @@
+{ pkgs, ... }:
+let
+  inherit (pkgs.vimUtils) buildVimPlugin;
+in
+buildVimPlugin {
+  name = "snippets";
+  src = ./.;
+}

packages/snippets/package.json

@@ -0,0 +1,15 @@
+{
+    "name": "snippets",
+    "engines": {
+        "vscode": "^1.11.0"
+    },
+    "contributes": {
+        "snippets": [
+            {
+                 "language": "nix",
+                 "path": "./snippets/nix.json"
+            }
+        ]
+    }
+}
+

packages/snippets/snippets/nix.json

@@ -0,0 +1,22 @@
+{
+  "module": {
+    "prefix": "mod",
+    "body": [
+      "{ config, lib, ... }:",
+      "let",
+      "  inherit (lib) mkEnableOption mkIf;",
+      "  cfg = config.$1;",
+      "in",
+      "{",
+      "  options.$2 = {",
+      "    enable = mkEnableOption \"$3\";",
+      "  };",
+      "",
+      "  config = mkIf cfg.enable {",
+      "    $4",
+      "  };",
+      "}"
+    ],
+    "description": "empty module"
+  }
+}