feat: add nix-shell and direnv support (#251)

.envrc

@@ -0,0 +1 @@
+use nix

.gitignore

@@ -136,3 +136,5 @@ paket-files/
 
 # some misc. proj. files
 .local/
+
+.direnv/

.vscode/extensions.json

@@ -1,5 +1,6 @@
 {
     "recommendations": [
-        "connor4312.esbuild-problem-matchers"
+        "connor4312.esbuild-problem-matchers",
+        "mkhl.direnv"
     ]
 }

README.md

@@ -18,7 +18,7 @@ Adds [nix](https://nixos.org/) language support for VSCode Editor.
 
 * When `Language Server` support is not enabled the following tools are used to
   + Formatting support. Set `nix.formatterPath` to any command which can accept file contents on stdin and return formatted text on stdout; e.g.,
-      ```json
+      ```jsonc
       {
         "nix.formatterPath": "nixpkgs-fmt" // default
         // "nix.formatterPath": "nixfmt" 
@@ -44,7 +44,7 @@ Adds [nix](https://nixos.org/) language support for VSCode Editor.
 
 ### Visual Studio Code
 
-Hit `F1` and enter the `ext install jnoortheen.nix-ide` command or search for `nix-ide` .
+Hit `F1` and enter the `ext install jnoortheen.nix-ide` command or search for `nix-ide`.
 
 ### *.vsix file
 
@@ -65,19 +65,23 @@ Just clone the [GitHub repository](https://github.com/bbenoist/vscode-nix) under
 
 ## Development
 
-* TypeScript is used to develop the extension
+There is [direnv](https://direnv.net/) and [nix-shell](https://nixos.wiki/wiki/Development_environment_with_nix-shell) support so a dev environment can be created with the `nix-shell` command or a one-time `direnv allow` at the root of the repo.
+
+Press `F5` in VSCode to run an Extension Development Host instance with the extension installed.
+
+TypeScript is used to develop the extension. 
 
 ```sh
-  yarn install
-  yarn build # this will build the extension
+yarn install # install dependencies
+yarn build   # build the extension
 ```
 
 ## Releasing a new version
 
 * fill `.env` from `.env.template`
 
 ```sh
-yarn env-cmd 
+yarn env-cmd
 yarn release
 ```
 

shell.nix

@@ -0,0 +1,11 @@
+{ pkgs ? import <nixpkgs> { } }:
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    nodejs-16_x
+    yarn
+    esbuild
+  ];
+  shellHook = ''
+    yarn install
+  '';
+}