Lua

Lua is an ergonomic interface to Luerl, aiming to be the best way to use Luerl from Elixir.

Features

• Ergonomic API for Elixir <> Lua FFI
• Improved error messages
• Deep-setting variables and state
• Excellent documentation and guides for working with Luerl

Executing Lua

Lua can be run using the eval!/2 function

    iex> {[4], _} =
    ...>   Lua.eval!("""
    ...>   return 2 + 2
    ...>   """)

Exposing Elixir functions to Lua

Lua provides the deflua macro for exposing Elixir functions to Lua

defmodule MyAPI do
  use Lua.API
      
  deflua double(v), do: 2 * v
end
    
lua = Lua.new() |> Lua.load_api(MyAPI)

{[10], _} =
  Lua.eval!(lua, """
  return double(5)
  """)

Credits

Lua piggy-backs off of Robert Virding's Luerl project, which implements an Lua lexer, parser, and full-blown lua virtual machine that runs inside the BEAM.