I am sitting with two pascal files, one calling Lua from Pascal, and the other calling Pascal from Lua. I managed to get both working, but they are little more than proof of concept still. And I am having trouble getting multiple variables from a pascal function when calling it from Lua. What is the proper way to create a pascal library that i can use to call from Lua?

Code:
library libexample;

{$MODE OBJFPC}
{$H+}

uses
  Classes,
  crt,
  lua53;

//{$R *.res}

var
    L: plua_state;
{============================================================}
function new_print(L: Plua_State): LongInt; cdecl;
{
    Redefined print here as it causes problems when using freepascal with Lua.
    Executing code from fpc, and using print in lua results in the cursor not
going back to the beginning.
}
var
    vars:string;
    i:integer;
    
begin
    vars:='';

    for i:=1 to lua_gettop(L) do begin
        if i = 1 then vars:=vars + lua_tostring(L, i) else vars:=vars + '    ' + lua_tostring(L, i);
    end;

    writeln(vars);
    new_print:=0;
end;
{============================================================}
function example(L: plua_state):LongInt; cdecl;
var
    a, b:string;
    
begin
    a := lua_tostring(L, 1);
    b := lua_tostring(L, 2);
    writeln('I am executing from Free pascal now.');
    writeln('received value: ', a, ' ', b);
    lua_setglobal(L, 'example');
    lua_pushinteger(L, 5);    // Currently, only the last value "echo" is sent, instead of both.
    lua_pushstring(L, 'echo');
    example := 1;
end;
{============================================================}
function luaopen_libexample(L: plua_state):LongInt; cdecl;
begin
    lua_register(L, pchar('new_print'), @new_print);
    lua_register(L, pchar('example'), @example);
    luaopen_libexample :=0;
end;

exports
  luaopen_libexample;
{============================================================}
begin
    writeln('Step 1. Loading the pascal module.');
    writeln ('This portion is autoexecuted whenever the module is loaded.');
    writeln;
end.
The above code is for a pascal library that can be called from lua, I had to redefine print as I noticed it does not work properly when calling print from lua, when having a pascal module loaded. Right now, I can send multiple variables from lua to pascal. But I also want to get multiple values from pascal to lua. And right now I can only get one.

Any help would be greatly appreciated.

Thanks in advance.

Dilan