let
  unstableTarball = fetchTarball
    "https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz";
  pkgs = import <nixpkgs> { };
  unstable = import unstableTarball { };

in with pkgs;
pkgs.mkShell rec {
  name = "rust";
  buildInputs = [
    entr
    openssl
    pkg-config
    unstable.cargo
    unstable.rustc
    unstable.rustfmt
    unstable.rust-analyzer
    postgresql
    diesel-cli
  ];
  # By default setup dev environment.
  AWS_ACCESS_KEY_ID = "0BO8BCZZXV3SFZ1B43W1";
  AWS_SECRET_ACCESS_KEY = "x6SjXJZuP1tMzxH/a6xEFDcMw4XB8qCfRPNbuGzN";
  DATABASE_USER = "comics_devel";
  DATABASE_NAME = "comics_devel";
  DATABASE_HOST = "postgres.h.xinu.tv";
  DATABASE_URL =
    "postgres://${DATABASE_USER}@${DATABASE_HOST}/${DATABASE_NAME}";
  PROD_DATABASE_USER = "comics";
  PROD_DATABASE_NAME = "comics";
  PROD_DATABASE_HOST = "postgres.h.xinu.tv";
  PROD_DATABASE_URL =
    "postgres://${PROD_DATABASE_USER}@${PROD_DATABASE_HOST}/${PROD_DATABASE_NAME}";
}