nixide/dev/flake-module.nix

{
  inputs,
  ...
}:
{
  imports = [
    inputs.pre-commit-hooks-nix.flakeModule
    inputs.hercules-ci-effects.flakeModule
    inputs.treefmt-nix.flakeModule
  ];
  perSystem =
    {
      config,
      pkgs,
      inputs',
      ...
    }:
    {
      nix-bindings-rust.nixPackage = inputs'.nix.packages.default;

      treefmt = {
        # Used to find the project root
        projectRootFile = "flake.lock";

        programs.rustfmt = {
          enable = true;
          edition = "2021";
        };
        programs.nixfmt.enable = true;
        programs.deadnix.enable = true;
        #programs.clang-format.enable = true;
      };

      pre-commit.settings.hooks.treefmt.enable = true;
      # Temporarily disable rustfmt due to configuration issues
      # pre-commit.settings.hooks.rustfmt.enable = true;
      pre-commit.settings.settings.rust.cargoManifestPath = "./Cargo.toml";

      # Check that we're using ///-style doc comments in Rust code.
      #
      # Unfortunately, rustfmt won't do this for us yet - at least not
      # without nightly, and it might do too much.
      pre-commit.settings.hooks.rust-doc-comments = {
        enable = true;
        files = "\\.rs$";
        entry = "${pkgs.writeScript "rust-doc-comments" ''
          #!${pkgs.runtimeShell}
          set -uxo pipefail
          grep -n -C3 --color=always -F '/**' "$@"
          r=$?
          set -e
          if [ $r -eq 0 ]; then
            echo "Please replace /**-style comments by /// style comments in Rust code."
            exit 1
          fi
        ''}";
      };

      devShells.default = pkgs.mkShell {
        name = "nix-bindings-devshell";
        strictDeps = true;
        inputsFrom = [ config.nci.outputs.nix-bindings.devShell ];
        inherit (config.nci.outputs.nix-bindings.devShell.env)
          LIBCLANG_PATH
          NIX_CC_UNWRAPPED
          ;
        NIX_DEBUG_INFO_DIRS =
          let
            # TODO: add to Nixpkgs lib
            getDebug =
              pkg:
              if pkg ? debug then
                pkg.debug
              else if pkg ? lib then
                pkg.lib
              else
                pkg;
          in
          "${getDebug config.packages.nix}/lib/debug";
        buildInputs = [
          config.packages.nix
        ];
        nativeBuildInputs = [
          pkgs.rust-analyzer
          pkgs.nixfmt-rfc-style
          pkgs.rustfmt
          pkgs.pkg-config
          pkgs.clang-tools # clangd
          pkgs.valgrind
          pkgs.gdb
          pkgs.hci
          # TODO: set up cargo-valgrind in shell and build
          #       currently both this and `cargo install cargo-valgrind`
          #       produce a binary that says ENOENT.
          # pkgs.cargo-valgrind
        ];
        shellHook = ''
          ${config.pre-commit.installationScript}
          source ${../bindgen-gcc.sh}
          echo 1>&2 "Welcome to the development shell!"
        '';
        # rust-analyzer needs a NIX_PATH for some reason
        NIX_PATH = "nixpkgs=${inputs.nixpkgs}";
      };
    };
  herculesCI =
    { ... }:
    {
      ciSystems = [ "x86_64-linux" ];
    };
  hercules-ci.flake-update = {
    enable = true;
    baseMerge.enable = true;
    autoMergeMethod = "merge";
    when = {
      dayOfMonth = 1;
    };
    flakes = {
      "." = { };
      "dev" = { };
    };
  };
  flake = { };
}