eww/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
      pkgsFor = system:
        import nixpkgs {
          inherit system;
          overlays = [ self.overlays.default rust-overlay.overlays.default ];
        };

      targetSystems = [ "aarch64-linux" "x86_64-linux" ];
      mkRustToolchain = pkgs:
        pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
    in {
      overlays.default = final: prev:
        let
          rust = mkRustToolchain final;

          rustPlatform = prev.makeRustPlatform {
            cargo = rust;
            rustc = rust;
          };
        in {
          eww = (prev.eww.override { inherit rustPlatform; }).overrideAttrs
            (old: {
              version = self.rev or "dirty";
              src = builtins.path {
                name = "eww";
                path = prev.lib.cleanSource ./.;
              };
              cargoDeps =
                rustPlatform.importCargoLock { lockFile = ./Cargo.lock; };
              patches = [ ];
                # remove this when nixpkgs includes it
                buildInputs = old.buildInputs ++ [ final.libdbusmenu-gtk3 ];
            });

          eww-wayland = final.eww;
        };

      packages = nixpkgs.lib.genAttrs targetSystems (system:
        let pkgs = pkgsFor system;
        in (self.overlays.default pkgs pkgs) // {
          default = self.packages.${system}.eww;
        });

      devShells = nixpkgs.lib.genAttrs targetSystems (system:
        let
          pkgs = pkgsFor system;
          rust = mkRustToolchain pkgs;
        in {
          default = pkgs.mkShell {
            packages = with pkgs; [
              rust
              rust-analyzer-unwrapped
              gcc
              glib
              gdk-pixbuf
              librsvg
              libdbusmenu-gtk3
              gtk3
              gtk-layer-shell
              pkg-config
              deno
              mdbook
            ];

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

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