Add shell.nix for vscode

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "nixEnvSelector.nixFile": "${workspaceRoot}/shell.nix"
+}

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1606424373,
+        "narHash": "sha256-oq8d4//CJOrVj+EcOaSXvMebvuTkmBJuT5tzlfewUnQ=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "99f1c2157fba4bfe6211a321fd0ee43199025dbf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1617631617,
@@ -63,6 +79,7 @@
     },
     "root": {
       "inputs": {
+        "flake-compat": "flake-compat",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
@@ -74,11 +91,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1617740844,
+        "lastModified": 1617762447,
-        "narHash": "sha256-ymJIGNI8/KVozGP4I0Kbt8UTNP+Pkv6lk3W+ABhLeFg=",
+        "narHash": "sha256-bv1e5VRZnSswnVtBH2Nc1omInZSRgASsS8xO+Fg9whc=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "8d3bb1034727d9a2084764230a1802131899a585",
+        "rev": "08263e3fa955acbcb6612c00d920d45e517b242d",
         "type": "github"
       },
       "original": {

flake.nix

@@ -5,9 +5,13 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     rust-overlay.url = "github:oxalica/rust-overlay";
     flake-utils.url = "github:numtide/flake-utils";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils, rust-overlay }:
+  outputs = { self, nixpkgs, flake-utils, rust-overlay, flake-compat }:
     flake-utils.lib.eachDefaultSystem 
       (system: 
         let pkgs = import nixpkgs {

shell.nix

@@ -0,0 +1,9 @@
+(import (
+  let
+    lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+  in fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+    sha256 = lock.nodes.flake-compat.locked.narHash; }
+) {
+  src =  ./.;
+}).shellNix