flake.nix

{
  description = "modeling-app development environment";

  # Flake inputs
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay"; # A helper for Rust + Nix
  };

  # Flake outputs
  outputs = {
    self,
    nixpkgs,
    rust-overlay,
  }: let
    # Overlays enable you to customize the Nixpkgs attribute set
    overlays = [
      # Makes a `rust-bin` attribute available in Nixpkgs
      (import rust-overlay)
      # Provides a `rustToolchain` attribute for Nixpkgs that we can use to
      # create a Rust environment
      (self: super: {
        rustToolchain = super.rust-bin.stable.latest.default.override {
          targets = ["wasm32-unknown-unknown"];
          extensions = ["rustfmt" "llvm-tools-preview"];
        };
      })
    ];

    # Systems supported
    allSystems = [
      "x86_64-linux" # 64-bit Intel/AMD Linux
      "aarch64-linux" # 64-bit ARM Linux
      "x86_64-darwin" # 64-bit Intel macOS
      "aarch64-darwin" # 64-bit ARM macOS
    ];

    # Helper to provide system-specific attributes
    forAllSystems = f:
      nixpkgs.lib.genAttrs allSystems (system:
        f {
          pkgs = import nixpkgs {inherit overlays system;};
        });
  in {
    # Development environment output
    devShells = forAllSystems ({pkgs}: {
      default = pkgs.mkShell {
        # The Nix packages provided in the environment
        packages =
          (with pkgs; [
            # The package provided by our custom overlay. Includes cargo, Clippy, cargo-fmt,
            # rustdoc, rustfmt, and other tools.
            rustToolchain

            cargo-nextest

            just
            openssl
            pkg-config
          ])
          ++ pkgs.lib.optionals pkgs.stdenv.isDarwin (with pkgs; [
            libiconv
            darwin.apple_sdk.frameworks.Security
          ]);

        TARGET_CC = "${pkgs.stdenv.cc}/bin/${pkgs.stdenv.cc.targetPrefix}cc";
        LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
      };
    });
  };
}