flake.nix


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{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
    systems.url = "github:nix-systems/default";
    treefmt-nix.url = "github:numtide/treefmt-nix";
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      systems = import inputs.systems;
      imports = [
        inputs.treefmt-nix.flakeModule
      ];
      perSystem = { config, self', pkgs, lib, system, ... }:
        let
          nonRustDeps = [
            pkgs.libiconv
          ];
        in
        {
          _module.args.pkgs = import inputs.nixpkgs {
              inherit system; overlays = [inputs.fenix.overlays.default];
          };
          # Rust dev environment
          devShells.default = pkgs.mkShell {
            inputsFrom = [config.treefmt.build.devShell];
            buildInputs = nonRustDeps;
            nativeBuildInputs = with pkgs; [
              (fenix.complete.withComponents [
                "cargo"
                "clippy"
                "rust-src"
                "rustc"
                "rustfmt"
              ])
              cargo-flamegraph
              rust-analyzer-nightly
            ];
          };

          # Add your auto-formatters here.
          # cf. https://numtide.github.io/treefmt/
          treefmt.config = {
            projectRootFile = "flake.nix";
            programs = {
              nixpkgs-fmt.enable = true;
              rustfmt.enable = true;
            };
          };
        };
    };

}