Shell for standard Elixir projects with file_system and ExUnit Notifier

shell.nix

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

let
  inherit (lib) optional optionals;
  elixir = beam.packages.erlangR21.elixir_1_7;
in

mkShell {
  buildInputs = [ elixir git ]
    ++ optional stdenv.isLinux libnotify # For ExUnit Notifier on Linux.
    ++ optional stdenv.isLinux inotify-tools # For file_system on Linux.
    ++ optional stdenv.isDarwin terminal-notifier # For ExUnit Notifier on macOS.
    ++ optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
      # For file_system on macOS.
      CoreFoundation
      CoreServices
    ]);
}