flake.nix

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
    treefmt-nix.url = "github:numtide/treefmt-nix";
    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
    crane.url = "github:ipetkov/crane";
    crane.inputs.nixpkgs.follows = "nixpkgs";
    crane.inputs.flake-compat.follows = "flake-compat";
    crane.inputs.flake-utils.follows = "flake-utils";
    crane.inputs.rust-overlay.follows = "rust-overlay";
    rust-overlay.url = "github:oxalica/rust-overlay";
    rust-overlay.inputs.flake-utils.follows = "flake-utils";
    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
    systems.url = "github:nix-systems/default";
    flake-utils.url = "github:numtide/flake-utils";
    flake-utils.inputs.systems.follows = "systems";
    flake-compat.url = "github:edolstra/flake-compat";
    flake-compat.flake = false;
  };

  outputs = inputs @ {
    self,
    flake-parts,
    ...
  }:
    flake-parts.lib.mkFlake {inherit inputs;}
    (let
      flakeModule = import ./flake-module.nix {flat-flake = self;};
    in {
      systems = import inputs.systems;
      imports = [
        inputs.flake-parts.flakeModules.easyOverlay
        inputs.treefmt-nix.flakeModule
        flakeModule
      ];
      flake.flakeModules.flatFlake = flakeModule;
      perSystem = {
        self',
        config,
        pkgs,
        lib,
        system,
        ...
      }: let
        craneLib = inputs.crane.lib.${system};
        src = craneLib.cleanCargoSource ./.;
        bareCommonArgs = {
          inherit src;
          nativeBuildInputs = with pkgs; [
            installShellFiles
          ];
        };
        cargoArtifacts = craneLib.buildDepsOnly bareCommonArgs;
        commonArgs = bareCommonArgs // {inherit cargoArtifacts;};
      in {
        packages = {
          flat-flake = craneLib.buildPackage (commonArgs
            // {
              postInstall = ''
                installShellCompletion --cmd flat-flake \
                  --bash <($out/bin/flat-flake completion bash) \
                  --fish <($out/bin/flat-flake completion fish) \
                  --zsh  <($out/bin/flat-flake completion zsh)
              '';
            });
          default = config.packages.flat-flake;
        };
        overlayAttrs.flat-flake = config.packages.flat-flake;
        checks = {
          package = self'.packages.flat-flake;
          doc = craneLib.cargoDoc commonArgs;
          fmt = craneLib.cargoFmt {inherit src;};
          nextest = craneLib.cargoNextest commonArgs;
          clippy = craneLib.cargoClippy (commonArgs
            // {
              cargoClippyExtraArgs = "--all-targets -- --deny warnings";
            });
        };
        devShells.default = pkgs.mkShell {
          inputsFrom = lib.attrValues self'.checks;
          packages = with pkgs; [
            rustup
            rust-analyzer
          ];
        };
        treefmt = {
          projectRootFile = "flake.nix";
          programs = {
            alejandra.enable = true;
            rustfmt.enable = true;
          };
        };
      };
    });
}