Simple embedded hello world C example for 5.1

[Wink Saville <wink@...>]

Today, was my first stab at trying Lua and I had trouble

getting an embedded Lua hello world C program working.

All of the examples I found on the internet didn't work for me.

I'd also suggest including the command line to compile,

as that was also not obvious. Below is what worked for

me on my Linux box.

Make the linux version:

  $ make linux

Add the hello_world.c program below to the root of lua source tree

and compile:

  $ gcc hello_world.c -o hello_world -I src/ -L src -llua -ldl -lm

Run:

  $ ./hello_world

  Yo dude

  I'm here too

  Hello world, from Lua 5.1!

// The hello program

#include <stdio.h>

#include "src/lua.h"

#include "src/lualib.h"

#include "src/lauxlib.h"

int main(int argc, char *argv[]) {

  // Open lua

  lua_State *L = lua_open();

  // Load the libraries

  luaL_openlibs(L);

  // Execution of a lua string

  luaL_dostring(L, "print \"Yo dude\"");

  // Load a string and then execute it.

  luaL_loadstring(L, "io.write(\"I'm here too\\n\")");

  lua_pcall(L, 0, LUA_MULTRET, 0);

  // Load from a file and then execute

  if (luaL_loadfile(L, "test/hello.lua") == 0) {

    // File loaded call it

    lua_pcall(L, 0, LUA_MULTRET, 0);

  }

  // Close lua

  lua_close (L);

  return 0;

}