Stop Elixir's CLI consuming app arguments and halting the VM

lib/util/args.ex

@@ -11,9 +11,19 @@ defmodule Burrito.Util.Args do
   """
   @spec get_arguments :: list(String.t())
   def get_arguments do
-    :init.get_plain_arguments() |> Enum.map(&to_string/1)
+    :init.get_plain_arguments()
+    |> Enum.map(&to_string/1)
+    |> strip_separator()
   end
 
+  # The wrapper passes `--no-halt --` after `-extra` to keep Elixir's CLI from
+  # halting the VM and from claiming the application's arguments. Neither is an
+  # argument, so drop them. Only this exact leading pair is matched, so an
+  # application that takes its own `--` still sees it.
+  defp strip_separator(["--no-halt", "--" | rest]), do: rest
+  defp strip_separator(["--" | rest]), do: rest
+  defp strip_separator(args), do: args
+
   @doc """
   Get the arguments from the CLI, regardless if run under Burrito or not.
   """

src/erlang_launcher.zig

@@ -72,6 +72,19 @@ pub fn launch(io: Io, install_dir: []const u8, env_map: *std.process.Environ.Map
         "-config",
         config_sys_path,
         "-extra",
+        // These two are for Elixir's CLI, which runs via `-s elixir start_cli`
+        // above and reads everything after `-extra`.
+        //
+        // --no-halt: without it the CLI halts the VM once it finishes, killing
+        // any application that is meant to keep running.
+        //
+        // --: without it the CLI claims --version and --help for itself and
+        // treats the first remaining argument as a script path.
+        //
+        // Burrito.Util.Args strips both back off before the application sees
+        // its arguments.
+        "--no-halt",
+        "--",
     };
 
     // Cross-platform: build args once, set env, spawn child, wait for exit