merge codegen into main crate

parser.nix

@@ -0,0 +1,18 @@
+{
+  stdenv,
+  rustPlatform,
+  lib,
+}: let
+  inherit (lib.sources) sourceByRegex;
+  src = sourceByRegex ./. ["Cargo.*" "(src|benches|tests|test_data)(/.*)?"];
+in
+  rustPlatform.buildRustPackage rec {
+    pname = "demostf-parser";
+    version = "0.1.0";
+
+    inherit src;
+
+    cargoLock = {
+      lockFile = ./Cargo.lock;
+    };
+  }