flake.nix

{
  description = "Gleam";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };

        inherit (pkgs) darwin inotify-tools nodejs-18_x terminal-notifier;
        inherit (pkgs.beam.packages.erlangR25) elixir;
        inherit (pkgs.lib) optional;
        inherit (pkgs.stdenv) isDarwin isLinux;

        linuxDeps = optional isLinux [ inotify-tools ];
        darwinDeps = optional isDarwin [ terminal-notifier ]
          ++ (with darwin.apple_sdk.frameworks; [
            CoreFoundation
            CoreServices
          ]);
      in {
        devShells = {
          default = pkgs.mkShell {
            buildInputs = [ elixir nodejs-18_x ] ++ linuxDeps ++ darwinDeps;

            shellHook = ''
              echo `${elixir}/bin/mix --version`
              echo `${elixir}/bin/iex --version`
            '';
          };
        };
      });
}