Create a Rust runtime for LB Prelude

.envrc

@@ -1 +1,2 @@
+nix_direnv_watch_file ./pre-commit.nix
 use flake .#default

.gitignore

@@ -14,4 +14,5 @@ result
 **/.spago
 **/.spago2nix
 **/dist
-**/output
+**/output
+.DS_Store

extras/pre-commit-hooks-extra.nix

@@ -0,0 +1,20 @@
+{ inputs, ... }: {
+  imports = [
+    inputs.pre-commit-hooks.flakeModule # Adds perSystem.pre-commit options
+  ];
+  perSystem = { pkgs, ... }:
+    let
+      rustfmt = pkgs.rust-bin.stable.latest.rustfmt;
+    in
+    {
+      pre-commit.settings.hooks = {
+        rustfmt-monorepo =
+          {
+            name = "rustfmt";
+            description = "Format Rust code.";
+            entry = "${rustfmt}/bin/rustfmt --color always";
+            files = "\\.rs$";
+          };
+      };
+    };
+}