Add missing shell.nix

Signed-off-by: Federico Damián Schonborn <fdschonborn@gmail.com>

README.md

@@ -44,7 +44,7 @@ Hello, AbleScript!
 }
 ```
 
-### In a Nix derivation
+### Using `fetchTarball`
 
 ```nix
 { lib, fetchTarball, ... }:

packages/ablescript/default.nix

@@ -11,7 +11,7 @@
 }:
 rustPlatform.buildRustPackage {
   pname = "ablescript";
-  inherit version cargoSha256;
+  inherit version;
 
   src = fetchFromGitea {
     domain = "git.ablecorp.us";
@@ -24,6 +24,8 @@ rustPlatform.buildRustPackage {
     inherit sha256;
   };
 
+  inherit cargoSha256;
+
   meta = with lib; {
     description = "A programming language designed to be bad";
     homepage = "https://git.ablecorp.us/AbleScript/able-script";

shell.nix

@@ -0,0 +1,8 @@
+(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