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.

vendor/lua-5.4.3/CMakeLists.txt

@@ -5,6 +5,8 @@ if(WIN32)
     add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 endif()
 
+# The lib to link against
+
 file(GLOB Lua_SRC "${CMAKE_CURRENT_SOURCE_DIR}/src/*.c")
 file(GLOB Lua_INC "${CMAKE_CURRENT_SOURCE_DIR}/src/*.h")
 list(REMOVE_ITEM Lua_SRC "src/lua.c" "src/luac.c")
@@ -12,5 +14,11 @@ list(REMOVE_ITEM Lua_SRC "src/lua.c" "src/luac.c")
 add_library(lua STATIC ${Lua_SRC} ${Lua_INC})
 target_include_directories(lua PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/src/")
 
+# Compile also the CLI utility
+
 add_executable(lua-cli src/lua.c)
 target_link_libraries(lua-cli PRIVATE lua)
+
+if(UNIX)
+    target_link_libraries(lua-cli PRIVATE m)
+endif()