Lua cpp expose

Exposition to Lua runtime mechanism proposition.

The user has to create an object that is LuaScriptAbleObject, make it inherit the CRTPLuaScriptObject class and voila.

For example, a simple FooBar examples might be:

// Default sample exposer for lua scripts
script_class (SampleObject) {
    LUA_SCRIPTABLE_CLASS(SampleObject)

    SampleObject()  noexcept { fprintf(stderr, "CREATE SampleObject\n"); }
    ~SampleObject() noexcept { fprintf(stderr, "DESTROY SampleObject\n"); }

    static int foo(lua_State *L) noexcept
    {
        SampleObject *obj = CHECK(L, 1);
        double bar        = luaL_checknumber(L, 2);
        return 0;
    }

    static constexpr inline auto metaMethods = { luaRegDefaultGC, LUA_DECL_CREATE(SampleObject) };
    static constexpr inline auto methods     = { LUA_DECL_METHOD(SampleObject, foo) };
};

A sample file for a script can be found at utils/lua/sample-spec.lua, this is just a proposition.

src/Lib/Script/CRTPLuaScriptObject.cc

-#include "LuaScript.hh"
+#include "CRTPLuaScriptObject.hh"
 #include "lua.hpp"
 
-using namespace Vivy::Script;
-
-/// LuaContext implementation
-
-LuaContext::LuaContext() noexcept
-    : L(luaL_newstate())
-{
-    luaL_openlibs(L);
-}
-
-LuaContext::~LuaContext() noexcept
-{
-}
-
-lua_State *
-LuaContext::getState() const noexcept
-{
-    return L;
-}
-
-int
-LuaContext::loadFile(const char *file) noexcept
-{
-    int rc = luaL_loadfile(L, file);
-    if (rc == LUA_OK)
-        return lua_pcall(L, 0, LUA_MULTRET, 0);
-    return rc;
-}
-
 /// SampleObject implementation
+using namespace Vivy::Script;
 
 SampleObject::SampleObject() noexcept
 {