flake.nix

{
  description = "A basic Rust devshell for NixOS users developing gtk/libadwaita apps";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    rust-overlay.url = "github:oxalica/rust-overlay";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      nixpkgs,
      rust-overlay,
      flake-utils,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        overlays = [ (import rust-overlay) ];
        pkgs = import nixpkgs { inherit system overlays; };
      in
      with pkgs;
      {
        devShells.default = mkShell {
          buildInputs = [
            bacon
            pkg-config
            libGL
            wrapGAppsHook4 # this is needed for relm4-icons to properly load after gtk::init()
            libadwaita
            fontconfig

            (rust-bin.fromRustupToolchainFile ./rust-toolchain.toml)
          ];

          shellHook = ''
            export GSETTINGS_SCHEMA_DIR=${glib.getSchemaPath gtk4}
          '';
        };
      }
    );
}