arc/flake.nix

{
  description = "arc – a delta-based version control system";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";

    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    crane = {
      url = "github:ipetkov/crane";
    };
  };

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

      perSystem = { system, pkgs, ... }:
        let
          rustToolchain = inputs.fenix.packages.${system}.stable.withComponents [
            "rustc"
            "cargo"
            "clippy"
            "rustfmt"
            "rust-src"
          ];

          craneLib = (inputs.crane.mkLib pkgs).overrideToolchain rustToolchain;

          src = craneLib.cleanCargoSource ./.;

          commonArgs = {
            pname = "arc";
            version = "0.1.0";
            inherit src;
            strictDeps = true;
            nativeBuildInputs = [ pkgs.pkg-config pkgs.cmake pkgs.perl ];
            nativeCheckInputs = [ pkgs.git pkgs.openssh ];
          };

          cargoArtifacts = craneLib.buildDepsOnly commonArgs;

          arc = craneLib.buildPackage (commonArgs // {
            inherit cargoArtifacts;
          });
        in
        {
          packages = {
            inherit arc;
            default = arc;
          };

          apps.default = {
            type = "app";
            program = "${arc}/bin/arc";
          };

          checks = {
            inherit arc;

            clippy = craneLib.cargoClippy (commonArgs // {
              inherit cargoArtifacts;
              cargoClippyExtraArgs = "--all-targets -- --deny warnings";
            });

            fmt = craneLib.cargoFmt {
              inherit src;
            };

            test = craneLib.cargoTest (commonArgs // {
              inherit cargoArtifacts;
            });
          };

          devShells.default = pkgs.mkShell {
            packages = [
              rustToolchain
              pkgs.git
              pkgs.pkg-config
              pkgs.cmake
              pkgs.perl
            ];

            RUST_BACKTRACE = "1";
          };
        };
    };
}