shell.nix for rust project

shell.nix

with import <nixpkgs> {
  overlays = map import [ ./nix/rust-overlay.nix ];
};
stdenv.mkDerivation rec {
  name = "hatchway";
  buildInputs = [
   rustChannels.stable.rust
#   rustChannels.nightly.rust
   openssl
   pkgconfig
   rdkafka
   zlib
   (stdenv.lib.optional stdenv.isDarwin pkgs.darwin.Security)
   (stdenv.lib.optional stdenv.isDarwin pkgs.darwin.apple_sdk.frameworks.CoreServices)
   (stdenv.lib.optional stdenv.isDarwin pkgs.darwin.apple_sdk.frameworks.CoreFoundation)
  ];
  RUST_SRC_PATH= "${rustChannels.stable.rust-src}/lib/rustlib/src/rust/src";
  shellHook = ''
    export PATH="$PWD/.cargo/bin:$PATH"

     export NIX_LDFLAGS="-F${pkgs.darwin.apple_sdk.frameworks.CoreFoundation}/Library/Frameworks -framework CoreFoundation $NIX_LDFLAGS";
  '';
}