flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
    crane.url = "github:ipetkov/crane";
    fenix.url = "github:nix-community/fenix";
    fenix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = inputs@{ nixpkgs, flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [ "aarch64-linux" "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];

      perSystem = { config, pkgs, system, inputs', self', ... }:
        let
          toolchain = with inputs.fenix.packages.${system};
            combine [
              latest.rustc
              latest.cargo
              latest.clippy
              latest.rust-analysis
              latest.rust-src
              latest.rustfmt
            ];

          craneLib = (inputs.crane.mkLib pkgs).overrideToolchain toolchain;
          common-build-args = {
            src = craneLib.cleanCargoSource (craneLib.path ./.);
          };
          deps-only = craneLib.buildDepsOnly ({ } // common-build-args);

          packages = {
            default = packages.gitu;
            gitu = craneLib.buildPackage (common-build-args // {
              doCheck = false;
              buildInputs = with pkgs;
                [ openssl pkg-config ] ++ pkgs.lib.optionals stdenv.isDarwin [
                  libiconv
                  darwin.apple_sdk.frameworks.Security
                  darwin.apple_sdk.frameworks.AppKit
                ];
            });
          };

          checks = {
            clippy = craneLib.cargoClippy ({
              cargoArtifacts = deps-only;
              cargoClippyExtraArgs = "--all-features -- --deny warnings";
            } // common-build-args);

            rust-fmt = craneLib.cargoFmt
              ({ inherit (common-build-args) src; } // common-build-args);

            rust-tests = craneLib.cargoNextest ({
              cargoArtifacts = deps-only;
              partitions = 1;
              partitionType = "count";
            } // common-build-args);
          };

        in rec {
          inherit packages checks;
        };
    };
}