The ecs stuff does not get loaded until they are required in lua

ecs-lua/include/ecs-lua.h

@@ -14,8 +14,8 @@ namespace ecs::lua {
 	};
 
 	template <typename T, typename... Constructor, typename... Args>
-	void register_component(sol::state& lua, Args... args) {
-		lua.new_usertype<T>(get_typename<T>(),
+	void register_component(sol::state& lua, sol::table& table, Args... args) {
+		table.new_usertype<T>(get_typename<T>(),
 			"new", sol::factories([](Constructor... constructor) {
 				return new T(constructor...);
 			}), args...

ecs-lua/src/ecs-lua.cpp

@@ -2,7 +2,10 @@
 
 namespace ecs::lua {
 	void init(sol::state& lua) {
-		sol::table ecs = lua.create_table("ecs");
+		// Add a preloader that loads all the ecs stuff
+		sol::table preload = lua["package"]["preload"];
+		preload["ecs"] = [&lua] {
+			sol::table ecs = lua.create_table();
 
 			ecs.new_usertype<Entity>("Entity",
 				"__tostring", [] (Entity* thiz) {
@@ -49,8 +52,11 @@ namespace ecs::lua {
 				}
 			);
 
-		register_component<LuaWrapper, sol::object>(lua,
+			register_component<LuaWrapper, sol::object>(lua, ecs,
 				"object", &LuaWrapper::object
 			);
+
+			return ecs;
+		};
 	}
 }

flint.lua

@@ -37,4 +37,5 @@ executable "test"
 	dependency "ecs-lua"
 	dependency "ecs-serial"
 
+run_dir "test"
 run_target "test"

test/src/main.cpp

@@ -22,23 +22,33 @@ struct Velocity : ecs::Component {
 
 int main() {
 	sol::state lua;
-	lua.open_libraries(sol::lib::base);
+	lua.open_libraries(sol::lib::base, sol::lib::package);
 
 	ecs::lua::init(lua);
 
-	ecs::lua::register_component<Position, float, float>(lua,
+	// @todo We should probably make this simpler to do...
+	sol::table preload = lua["package"]["preload"];
+	preload["ecs_test"] = [&lua] {
+		sol::table test = lua.create_table();
+
+		ecs::lua::register_component<Position, float, float>(lua, test,
 			"x", &Position::x,
 			"y", &Position::y
 		);
+
+		ecs::lua::register_component<Velocity, float, float>(lua, test,
+			"x", &Velocity::x,
+			"y", &Velocity::y
+		);
+
+		return test;
+	};
+
 	ecs::serial::register_component<Position>(
 		&Position::x,
 		&Position::y
 	);
 
-	ecs::lua::register_component<Velocity, float, float>(lua,
-		"x", &Velocity::x,
-		"y", &Velocity::y
-	);
 	ecs::serial::register_component<Velocity>(
 		&Velocity::x,
 		&Velocity::y
@@ -57,67 +67,7 @@ int main() {
 			return manager;
 		});
 
-		lua.script(R"lua(
-			manager = get_manager()
-			ent = manager:create_entity()
-			-- In the future we will be able to also write components in lua
-			-- @todo Figure out how get_component will work in this case
-			ent:add_component("Position", Position.new(1.9, 9.7))
-			ent:add_component("Velocity", Velocity.new(0.2, 0.3))
-			random = {
-				a = 10,
-				b = 11,
-				c = function(s)
-					print("Hello " .. s .. "!")
-				end
-			}
-			ent:add_component("Random", LuaWrapper.new(random))
-
-			print(ent:has_components("Position", "Velocity"))
-			pos = ent:get_component("Position")
-			print("x: " .. pos.x)
-			print("y: " .. pos.y)
-			vel = ent:get_component("Velocity")
-			print("v_x: " .. vel.x)
-			print("v_y: " .. vel.y)
-
-			print("View test")
-			view = manager:view("Position", "Velocity")
-			view:for_each(function(ent)
-				pos = ent:get_component("Position")
-				vel = ent:get_component("Velocity")
-
-				pos.x = pos.x + vel.x
-				pos.y = pos.y + vel.y
-
-				print(ent)
-
-				print("x: " .. pos.x)
-				print("y: " .. pos.y)
-
-				print("v_x: " .. vel.x)
-				print("v_y: " .. vel.y)
-			end)
-
-			-- @todo Implement this
-			-- for uuid,entity in pairs(view) do
-				-- print "TEST"
-			-- end
-
-			manager:view("Random"):for_each(function(ent)
-				wrapped = ent:get_component("Random").object
-
-				print(wrapped.a)
-				wrapped.a = 11
-				print(wrapped.a)
-				print(random.a)
-				random.a = 20
-				print(wrapped.a)
-				print(random.a)
-
-				random.c("you")
-			end)
-		)lua");
+		lua.script_file("test.lua");
 
 		// for (int i = 0; i < 10; ++i) {
 		// 	// We can create entities

test/test.lua

@@ -0,0 +1,60 @@
+local ecs = require "ecs"
+local test = require "ecs_test"
+
+manager = get_manager()
+ent = manager:create_entity()
+ent:add_component("Position", test.Position.new(1.9, 9.7))
+ent:add_component("Velocity", test.Velocity.new(0.2, 0.3))
+random = {
+	a = 10,
+	b = 11,
+	c = function(s)
+		print("Hello " .. s .. "!")
+	end
+}
+ent:add_component("Random", ecs.LuaWrapper.new(random))
+
+print(ent:has_components("Position", "Velocity"))
+pos = ent:get_component("Position")
+print("x: " .. pos.x)
+print("y: " .. pos.y)
+vel = ent:get_component("Velocity")
+print("v_x: " .. vel.x)
+print("v_y: " .. vel.y)
+
+print("View test")
+view = manager:view("Position", "Velocity")
+view:for_each(function(ent)
+	pos = ent:get_component("Position")
+	vel = ent:get_component("Velocity")
+
+	pos.x = pos.x + vel.x
+	pos.y = pos.y + vel.y
+
+	print(ent)
+
+	print("x: " .. pos.x)
+	print("y: " .. pos.y)
+
+	print("v_x: " .. vel.x)
+	print("v_y: " .. vel.y)
+end)
+
+-- @todo Implement this
+-- for uuid,entity in pairs(view) do
+-- print "TEST"
+-- end
+
+manager:view("Random"):for_each(function(ent)
+	wrapped = ent:get_component("Random").object
+
+	print(wrapped.a)
+	wrapped.a = 11
+	print(wrapped.a)
+	print(random.a)
+	random.a = 20
+	print(wrapped.a)
+	print(random.a)
+
+	random.c("you")
+end)