Added codegen to register components, and started reworking lua

ecs-serial/include/ecs-serial.h

@@ -1,3 +1,5 @@
+#include <functional>
+#include <ostream>
 #pragma once
 #include "ecs.h"
 
@@ -57,6 +59,17 @@ namespace ecs::serial {
 		internal::functions.insert({ComponentID::id<T>, {func1, func2, func3}});
 	}
 
+	template <typename T>
+	void register_component_custom(std::function<void(std::ostream&, ecs::Component*)> func1, std::function<void(std::istream&, Component*)> func2) {
+		auto func3 = [] () -> Component* {
+			return new T();
+		};
+
+		internal::functions.insert({ComponentID::id<T>, {func1, func2, func3}});
+	}
+
 	void serialize(std::ostream& os, Entity* entity);
 	void deserialize(std::istream& is, Manager& manager);
+
+	void serialize_ids(std::ostream& os);
 }

ecs-serial/src/ecs-serial.cpp

@@ -1,6 +1,14 @@
 #include "ecs-serial.h"
 
+#include "/home/tim/Projects/cpp/iohelper/iohelper/include/iohelper/read.h"
+#include "/home/tim/Projects/cpp/iohelper/iohelper/include/iohelper/write.h"
+#include "ecs.h"
+#include <ostream>
 
+#include <stdexcept>
+
+// @todo We need to make sure that the id list stays the same between versions
+// Maybe store that in the stream as well?
 namespace ecs::serial {
 	std::unordered_map<size_t, std::tuple<std::function<void(std::ostream&, ecs::Component*)>, std::function<void(std::istream&, ecs::Component*)>, std::function<ecs::Component*()>>> internal::functions;
 
@@ -11,8 +19,12 @@ namespace ecs::serial {
 		auto components = entity->get_components();
 		iohelper::write_length(os, components.size());
 		for (auto [id, component] : components) {
+			auto functions = internal::functions.find(id);
+			if (functions == internal::functions.end()) {
+				throw std::runtime_error("Unknown id");
+			}
+
 			iohelper::write_length(os, id);
-			// @todo What if the function does not exist?
 			std::get<0>(internal::functions[id])(os, component);
 		}
 	}
@@ -60,4 +72,14 @@ namespace ecs::serial {
 			}
 		}
 	}
+
+	void serialize_ids(std::ostream& os) {
+		auto& ids = ComponentID::_ids();
+
+		iohelper::write_length(os, ids.size());
+		for (auto& [name, id] : ids) {
+			iohelper::write<std::string>(os, name);
+			iohelper::write_length(os, id);
+		}
+	}
 }