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Rust templates and quasiquoting for Elixir

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rustq lib rustq rustler nif_struct.ex
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lib/rustq/rustler/nif_struct.ex 

defmodule RustQ.Rustler.NifStruct do

  @moduledoc false



  alias RustQ.Rust



  @spec build(atom() | String.t(), module() | String.t(), keyword()) :: Rust.Fragment.t()

  def build(name, module, opts \\ []) do

    fields =

      opts

      |> Keyword.get(:fields, [])

      |> Enum.map(fn

        %RustQ.Rust.Field{} = field -> field

        {field, type} -> Rust.field(field, type, vis: Keyword.get(opts, :field_vis, :pub))

      end)



    name

    |> Rust.struct(

      vis: Keyword.get(opts, :vis, :pub),

      derive: Keyword.get(opts, :derive, [:Clone, :Debug, :NifStruct]),

      fields: fields,

      attrs: [["module = ", inspect(module_name(module))]] ++ Keyword.get(opts, :attrs, [])

    )

    |> Rust.to_fragment()

    |> Rust.item()

  end



  defp module_name(module) when is_atom(module), do: Atom.to_string(module)

  defp module_name(module) when is_binary(module), do: module

end