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Rust templates and quasiquoting for Elixir

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rustq lib rustq meta attrs.ex
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lib/rustq/meta/attrs.ex 

defmodule RustQ.Meta.Attrs do

  @moduledoc false



  alias RustQ.Rust.AST



  def take_pending(module) do

    nif = Module.get_attribute(module, :nif)

    allow = Module.get_attribute(module, :allow) |> List.wrap() |> Enum.reverse()

    Module.delete_attribute(module, :nif)

    Module.delete_attribute(module, :allow)



    []

    |> add_nif_attr(nif)

    |> Kernel.++(Enum.map(allow, &allow_attr/1))

  end



  def current_rust_mod(module), do: Module.get_attribute(module, :rustq_current_rust_mod)



  defp add_nif_attr(attrs, nil), do: attrs

  defp add_nif_attr(attrs, false), do: attrs

  defp add_nif_attr(attrs, true), do: attrs ++ [%AST.Attribute{path: [:rustler, :nif]}]



  defp add_nif_attr(attrs, opts) when is_list(opts),

    do: attrs ++ [%AST.Attribute{path: [:rustler, :nif], args: opts}]



  defp allow_attr(values), do: %AST.Attribute{path: [:allow], args: List.wrap(values)}

end