Rust Lua

main.rs

use rlua::{Function, Lua, Table};

fn main(){
  let lua = Lua::new();
  lua.context(|lua_ctx| {
    let contents = std::fs::read_to_string("parser.lua").expect("Something went wrong reading the file");
    
    // load chunk
    lua_ctx.load(&contents).set_name("parser")?.exec()?;
    
    // get function
    let globals = lua_ctx.globals();
    let parse: Function = globals.get("parse_fn").expect("Cannot get function parse");
    
    // make the call, parse arguments as tuple, returns a table (basically a hashmap in lua)
    let result: Table = parse.call::<_, Table>(("hello", "world")).expect("Cannot call on function parse");

    // use the results from the table
    let k: String = result.get("key").expect("no key");
    let target_url: String = result.get("target_url").expect("no value");
    
    println!("{}: {}", k, target_url);
    
    Ok(())
  });
}

parser.lua

function parse_fn(a, b)
  return {
    key = a .. b,
    target_url = "https://google.com",
  }
end