flake.nix

{
  description = "Build a cargo project";

  inputs = {
    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;

    crane = {
      url = "github:ipetkov/crane";
      inputs.nixpkgs.follows = "nixpkgs";
    };

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

    flake-utils.url = github:numtide/flake-utils;
  };

  outputs = { self, nixpkgs, crane, fenix, flake-utils, ... }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};

        inherit (pkgs) lib;

        craneLib = crane.mkLib pkgs;
        src = craneLib.cleanCargoSource ./.;

        commonArgs = {
          inherit src;
          strictDeps = true;
        };

        craneLibLLvmTools = craneLib.overrideToolchain
          (fenix.packages.${system}.complete.withComponents [
            "cargo"
            "llvm-tools"
            "rustc"
          ]);

        cargoArtifacts = craneLib.buildDepsOnly commonArgs;

        kvreadme = craneLib.buildPackage (commonArgs // { inherit cargoArtifacts; });
      in
      {
        checks = {
          inherit kvreadme;
          kvreadme-fmt = craneLib.cargoFmt { inherit src; };
        };

        packages.default = kvreadme;

        apps.default = flake-utils.lib.mkApp {
          drv = kvreadme;
        };

        devShells.default = craneLib.devShell {
          checks = self.checks.${system};
        };
      });
}