flake.nix

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

  outputs = { self, nixpkgs, rust-overlay, flake-compat }:
    let
      overlays = [ (import rust-overlay) self.overlays.default ];
      pkgsFor = system: import nixpkgs { inherit system overlays; };

      targetSystems = [ "aarch64-linux" "x86_64-linux" ];
      mkRustToolchain = pkgs:
        pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
    in {
      overlays.default = final: prev: {
        inherit (self.packages.${prev.system}) eww eww-wayland;
      };

      packages = nixpkgs.lib.genAttrs targetSystems (system:
        let
          pkgs = pkgsFor system;
          rust = mkRustToolchain pkgs;
          rustPlatform = pkgs.makeRustPlatform {
            cargo = rust;
            rustc = rust;
          };
          version = (builtins.fromTOML
            (builtins.readFile ./crates/eww/Cargo.toml)).package.version;
        in rec {
          eww = rustPlatform.buildRustPackage {
            version = "${version}-dirty";
            pname = "eww";

            src = ./.;
            cargoLock.lockFile = ./Cargo.lock;
            cargoBuildFlags = [ "--bin" "eww" ];

            nativeBuildInputs = with pkgs; [ pkg-config wrapGAppsHook ];
            buildInputs = with pkgs; [
              gtk3
              librsvg
              gtk-layer-shell
              libdbusmenu-gtk3
            ];
          };

          eww-wayland = nixpkgs.lib.warn
            "`eww-wayland` is deprecated due to eww building with both X11 and wayland support by default. Use `eww` instead."
            eww;
          default = eww;
        });

      devShells = nixpkgs.lib.genAttrs targetSystems (system:
        let
          pkgs = pkgsFor system;
          rust = mkRustToolchain pkgs;
        in {
          default = pkgs.mkShell {
            inputsFrom = [ self.packages.${system}.eww ];
            packages = with pkgs; [ deno mdbook ];

            RUST_SRC_PATH = "${rust}/lib/rustlib/src/rust/library";
          };
        });

      formatter =
        nixpkgs.lib.genAttrs targetSystems (system: (pkgsFor system).nixfmt);
    };
}