flake.nix

{
  description = "A fast libinput-based touchpad gestures program";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
    utils.url = "github:numtide/flake-utils";
    rust-overlay.url = "github:oxalica/rust-overlay";
    crate2nix = {
      url = "github:kolloch/crate2nix";
      flake = false;
    };
  };

  outputs = { self, nixpkgs, utils, rust-overlay, crate2nix, ... }:
  let 
    name = "gestures";
  in utils.lib.eachSystem
    [
      utils.lib.system.x86_64-linux
    ]
    (system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [
            rust-overlay.overlay
            (self: super: {
              rustc = self.rust-bin.stable.latest.default;
              cargo = self.rust-bin.stable.latest.default;
            })
          ];
        };
        inherit (import "${crate2nix}/tools.nix" { inherit pkgs; })
          generatedCargoNix;   

        project = pkgs.callPackage
          (generatedCargoNix {
            inherit name;
            src = ./.;
          })
          {
            defaultCrateOverrides = pkgs.defaultCrateOverrides // {
              ${name} = oldAttrs: {
                inherit buildInputs nativeBuildInputs;
              } // buildEnvVars;
            };
          };

        buildInputs = with pkgs; [ libinput udev ];
        nativeBuildInputs = with pkgs; [ rustc cargo pkgconfig nixpkgs-fmt ];
        buildEnvVars = {};
      in
      rec {
        packages.${name} = project.rootCrate.build;

        defaultPackage = packages.${name};

        apps.${name} = utils.lib.mkApp {
          inherit name;
          drv = packages.${name};
        };
        defaultApp = apps.${name};

        devShell = pkgs.mkShell
          {
            inherit buildInputs nativeBuildInputs;
            RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
          } // buildEnvVars;
      }
    );
}