21 files changed, 214 insertions, 97 deletions
diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index d85aef0..8323490 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -9,7 +9,6 @@ target_sources(crepe PUBLIC
 	Rigidbody.cpp
 	Sprite.cpp
 	ScriptSystem.cpp
-	Script.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
diff --git a/src/crepe/Component.cpp b/src/crepe/Component.cpp
index d14159c..bce90f1 100644
--- a/src/crepe/Component.cpp
+++ b/src/crepe/Component.cpp
@@ -1,5 +1,3 @@
 #include "Component.h"
 
 using namespace crepe;
-
-Component::Component() : active(true) {}
diff --git a/src/crepe/Component.h b/src/crepe/Component.h
index 16a4ce5..d9a01ac 100644
--- a/src/crepe/Component.h
+++ b/src/crepe/Component.h
@@ -3,12 +3,15 @@
 namespace crepe {
 
 class Component {
+protected:
+	Component() = default;
+
 public:
-	Component();
+	virtual ~Component() = default;
 	// TODO: shouldn't this constructor be deleted because this class will never
 	// directly be instantiated?
 
-	bool active;
+	bool active = true;
 };
 
 } // namespace crepe
diff --git a/src/crepe/ComponentManager.cpp b/src/crepe/ComponentManager.cpp
index 9a3fec7..8bde33a 100644
--- a/src/crepe/ComponentManager.cpp
+++ b/src/crepe/ComponentManager.cpp
@@ -1,4 +1,5 @@
 #include "ComponentManager.h"
+#include "util/log.h"
 
 using namespace crepe;
 
@@ -20,5 +21,9 @@ void ComponentManager::delete_all_components_of_id(uint32_t id) {
 
 void ComponentManager::delete_all_components() {
 	// Clear the whole unordered_map<>
-	components.clear();
+	this->components.clear();
 }
+
+ComponentManager::ComponentManager() { dbg_trace(); }
+
+ComponentManager::~ComponentManager() { dbg_trace(); }
diff --git a/src/crepe/ComponentManager.h b/src/crepe/ComponentManager.h
index 2ab9dc8..38f32e4 100644
--- a/src/crepe/ComponentManager.h
+++ b/src/crepe/ComponentManager.h
@@ -23,7 +23,7 @@ public:
 public:
 	//! Add a component of a specific type
 	template <typename T, typename... Args>
-	void add_component(uint32_t id, Args &&... args);
+	T & add_component(uint32_t id, Args &&... args);
 	//! Deletes all components of a specific type and id
 	template <typename T>
 	void delete_components_by_id(uint32_t id);
@@ -44,7 +44,8 @@ public:
 	std::vector<std::reference_wrapper<T>> get_components_by_type() const;
 
 private:
-	ComponentManager() = default;
+	ComponentManager();
+	virtual ~ComponentManager();
 
 	/*
 	 * The std::unordered_map<std::type_index, std::vector<std::vector<std::unique_ptr<Component>>>> below might seem a bit strange, let me explain this structure:
diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/ComponentManager.hpp
index 2ea0c70..2377a94 100644
--- a/src/crepe/ComponentManager.hpp
+++ b/src/crepe/ComponentManager.hpp
@@ -7,7 +7,7 @@
 namespace crepe {
 
 template <class T, typename... Args>
-void ComponentManager::add_component(uint32_t id, Args &&... args) {
+T & ComponentManager::add_component(uint32_t id, Args &&... args) {
 	using namespace std;
 
 	static_assert(is_base_of<Component, T>::value,
@@ -33,6 +33,8 @@ void ComponentManager::add_component(uint32_t id, Args &&... args) {
 	T * instance = new T(forward<Args>(args)...);
 	// store its unique_ptr in the vector<>
 	components[type][id].push_back(unique_ptr<T>(instance));
+
+	return *instance;
 }
 
 template <typename T>
@@ -61,11 +63,9 @@ void ComponentManager::delete_components() {
 	// Determine the type of T (this is used as the key of the unordered_map<>)
 	std::type_index type = typeid(T);
 
-	// Find the type (in the unordered_map<>)
-	if (components.find(type) != components.end()) {
-		// Clear the whole vector<> of this specific type
-		components[type].clear();
-	}
+	if (components.find(type) == components.end()) return;
+
+	components[type].clear();
 }
 
 template <typename T>
@@ -79,30 +79,26 @@ ComponentManager::get_components_by_id(uint32_t id) const {
 	// Create an empty vector<>
 	vector<reference_wrapper<T>> component_vector;
 
-	// Find the type (in the unordered_map<>)
-	if (components.find(type) != components.end()) {
-		// Get the correct vector<>
-		const vector<vector<unique_ptr<Component>>> & component_array
-			= components.at(type);
+	if (components.find(type) == components.end()) return component_vector;
 
-		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
-		if (id < component_array.size()) {
-			// Loop trough the whole vector<>
-			for (const unique_ptr<Component> & component_ptr :
-				 component_array[id]) {
-				// Cast the unique_ptr to a raw pointer
-				T * casted_component = static_cast<T *>(component_ptr.get());
-
-				// Ensure that the cast was successful
-				if (casted_component) {
-					// Add the dereferenced raw pointer to the vector<>
-					component_vector.push_back(*casted_component);
-				}
-			}
-		}
+	// Get the correct vector<>
+	const vector<vector<unique_ptr<Component>>> & component_array
+		= components.at(type);
+
+	// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+	if (id >= component_array.size()) return component_vector;
+
+	// Loop trough the whole vector<>
+	for (const unique_ptr<Component> & component_ptr : component_array[id]) {
+		// Cast the unique_ptr to a raw pointer
+		T * casted_component = static_cast<T *>(component_ptr.get());
+
+		if (casted_component == nullptr) continue;
+
+		// Add the dereferenced raw pointer to the vector<>
+		component_vector.push_back(*casted_component);
 	}
 
-	// Return the vector<>
 	return component_vector;
 }
 
@@ -120,30 +116,28 @@ ComponentManager::get_components_by_type() const {
 	// uint32_t id = 0;
 
 	// Find the type (in the unordered_map<>)
-	if (components.find(type) != components.end()) {
+	if (components.find(type) == components.end()) return component_vector;
 
-		// Get the correct vector<>
-		const vector<vector<unique_ptr<Component>>> & component_array
-			= components.at(type);
-
-		// Loop through the whole vector<>
-		for (const vector<unique_ptr<Component>> & component :
-			 component_array) {
-			// Loop trough the whole vector<>
-			for (const unique_ptr<Component> & component_ptr : component) {
-				// Cast the unique_ptr to a raw pointer
-				T * casted_component = static_cast<T *>(component_ptr.get());
-
-				// Ensure that the cast was successful
-				if (casted_component) {
-					// Pair the dereferenced raw pointer and the id and add it to the vector<>
-					component_vector.emplace_back(ref(*casted_component));
-				}
-			}
-
-			// Increase the id (the id will also be stored in the returned vector<>)
-			//++id;
+	// Get the correct vector<>
+	const vector<vector<unique_ptr<Component>>> & component_array
+		= components.at(type);
+
+	// Loop through the whole vector<>
+	for (const vector<unique_ptr<Component>> & component : component_array) {
+		// Loop trough the whole vector<>
+		for (const unique_ptr<Component> & component_ptr : component) {
+			// Cast the unique_ptr to a raw pointer
+			T * casted_component = static_cast<T *>(component_ptr.get());
+
+			// Ensure that the cast was successful
+			if (casted_component == nullptr) continue;
+
+			// Pair the dereferenced raw pointer and the id and add it to the vector<>
+			component_vector.emplace_back(ref(*casted_component));
 		}
+
+		// Increase the id (the id will also be stored in the returned vector<>)
+		//++id;
 	}
 
 	// Return the vector<>
diff --git a/src/crepe/GameObject.h b/src/crepe/GameObject.h
index 3588d9a..b5d6399 100644
--- a/src/crepe/GameObject.h
+++ b/src/crepe/GameObject.h
@@ -10,7 +10,7 @@ public:
 	GameObject(uint32_t id, std::string name, std::string tag, int layer);
 
 	template <typename T, typename... Args>
-	void add_component(Args &&... args);
+	T & add_component(Args &&... args);
 
 	uint32_t id;
 	std::string name;
diff --git a/src/crepe/GameObject.hpp b/src/crepe/GameObject.hpp
index 5966fbf..8cd1abe 100644
--- a/src/crepe/GameObject.hpp
+++ b/src/crepe/GameObject.hpp
@@ -7,9 +7,9 @@
 namespace crepe {
 
 template <typename T, typename... Args>
-void GameObject::add_component(Args &&... args) {
+T & GameObject::add_component(Args &&... args) {
 	auto & mgr = ComponentManager::get_instance();
-	mgr.add_component<T>(id, std::forward<Args>(args)...);
+	return mgr.add_component<T>(id, std::forward<Args>(args)...);
 }
 
 } // namespace crepe
diff --git a/src/crepe/Script.cpp b/src/crepe/Script.cpp
deleted file mode 100644
index 3b83b7c..0000000
--- a/src/crepe/Script.cpp
+++ /dev/null
@@ -1,6 +0,0 @@
-#include "Script.h"
-
-using namespace crepe;
-
-void Script::init() {}
-void Script::update() {}
diff --git a/src/crepe/ScriptSystem.cpp b/src/crepe/ScriptSystem.cpp
index 988bb71..5d882be 100644
--- a/src/crepe/ScriptSystem.cpp
+++ b/src/crepe/ScriptSystem.cpp
@@ -1,8 +1,16 @@
-#include "util/log.h"
+#include <forward_list>
+#include <functional>
+#include <vector>
 
+#include "ComponentManager.h"
 #include "ScriptSystem.h"
+#include "api/BehaviorScript.h"
+#include "api/Script.h"
+#include "util/log.h"
 
+using namespace std;
 using namespace crepe;
+using namespace crepe::api;
 
 ScriptSystem::ScriptSystem() { dbg_trace(); }
 ScriptSystem::~ScriptSystem() { dbg_trace(); }
@@ -12,4 +20,26 @@ ScriptSystem & ScriptSystem::get_instance() {
 	return instance;
 }
 
-void ScriptSystem::update() { dbg_trace(); }
+void ScriptSystem::update() {
+	using namespace std;
+	dbg_trace();
+
+	forward_list<Script *> scripts = this->get_scripts();
+	for (Script * script : scripts) script->update();
+}
+
+forward_list<Script *> ScriptSystem::get_scripts() {
+	forward_list<Script *> scripts = {};
+	ComponentManager & mgr = ComponentManager::get_instance();
+	vector<reference_wrapper<BehaviorScript>> behavior_scripts
+		= mgr.get_components_by_type<BehaviorScript>();
+
+	for (auto behavior_script_ref : behavior_scripts) {
+		BehaviorScript & behavior_script = behavior_script_ref.get();
+		Script * script = behavior_script.script.get();
+		if (script == nullptr) continue;
+		scripts.push_front(script);
+	}
+
+	return scripts;
+}
diff --git a/src/crepe/ScriptSystem.h b/src/crepe/ScriptSystem.h
index 72e360b..1f472a0 100644
--- a/src/crepe/ScriptSystem.h
+++ b/src/crepe/ScriptSystem.h
@@ -1,17 +1,26 @@
 #pragma once
 
+#include <forward_list>
+
 #include "System.h"
 
+namespace crepe::api {
+class Script;
+}
+
 namespace crepe {
 
 class ScriptSystem : public System {
 public:
 	static ScriptSystem & get_instance();
-	virtual void update();
+	void update();
 
 private:
 	ScriptSystem();
 	~ScriptSystem();
+
+private:
+	std::forward_list<api::Script *> get_scripts();
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/BehaviorScript.cpp b/src/crepe/api/BehaviorScript.cpp
index 84bfd4c..1f236b4 100644
--- a/src/crepe/api/BehaviorScript.cpp
+++ b/src/crepe/api/BehaviorScript.cpp
@@ -1,6 +1,7 @@
 #include "../util/log.h"
 
 #include "BehaviorScript.h"
+#include "Script.h"
 
 using namespace crepe::api;
 
diff --git a/src/crepe/api/BehaviorScript.h b/src/crepe/api/BehaviorScript.h
index 1d05a75..6ce6798 100644
--- a/src/crepe/api/BehaviorScript.h
+++ b/src/crepe/api/BehaviorScript.h
@@ -1,16 +1,36 @@
 #pragma once
 
-#include "../Component.h"
-#include "../Script.h"
+#include <memory>
+
+#include "Component.h"
+#include "Script.h"
+
+namespace crepe {
+class ScriptSystem;
+class ComponentManager;
+} // namespace crepe
 
 namespace crepe::api {
 
-class BehaviorScript : public Script, public Component {
-	// only allow ComponentManager to instantiate scripts
-	friend class ComponentManager;
+class Script;
 
+class BehaviorScript : public Component {
 protected:
+	friend class crepe::ComponentManager;
 	BehaviorScript();
+
+public:
+	virtual ~BehaviorScript() = default;
+
+public:
+	template <class T>
+	BehaviorScript & set_script();
+
+protected:
+	friend class crepe::ScriptSystem;
+	std::unique_ptr<Script> script = nullptr;
 };
 
 } // namespace crepe::api
+
+#include "BehaviorScript.hpp"
diff --git a/src/crepe/api/BehaviorScript.hpp b/src/crepe/api/BehaviorScript.hpp
new file mode 100644
index 0000000..a6bd81c
--- /dev/null
+++ b/src/crepe/api/BehaviorScript.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <type_traits>
+
+#include "../util/log.h"
+#include "BehaviorScript.h"
+
+namespace crepe::api {
+
+template <class T>
+BehaviorScript & BehaviorScript::set_script() {
+	static_assert(std::is_base_of<Script, T>::value);
+	dbg_trace();
+	Script * s = new T();
+	this->script = std::unique_ptr<Script>(s);
+	return *this;
+}
+
+} // namespace crepe::api
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
new file mode 100644
index 0000000..5016ed0
--- /dev/null
+++ b/src/crepe/api/Script.cpp
@@ -0,0 +1,3 @@
+#include "Script.h"
+
+using namespace crepe::api;
diff --git a/src/crepe/Script.h b/src/crepe/api/Script.h
index cdd6814..0036d1f 100644
--- a/src/crepe/Script.h
+++ b/src/crepe/api/Script.h
@@ -1,15 +1,21 @@
 #pragma once
 
 namespace crepe {
+class ScriptSystem;
+}
+
+namespace crepe::api {
 
 class Script {
+	friend class crepe::ScriptSystem;
+
 protected:
-	virtual void init();
-	virtual void update();
+	virtual void init() {}
+	virtual void update() {}
 	// NOTE: additional *events* (like unity's OnDisable and OnEnable) should be
 	// implemented as member methods in derivative user script classes and
 	// registered in init(), otherwise this class will balloon in size with each
 	// added event.
 };
 
-} // namespace crepe
+} // namespace crepe::api
diff --git a/src/crepe/util/CMakeLists.txt b/src/crepe/util/CMakeLists.txt
index 100f028..e2cffaf 100644
--- a/src/crepe/util/CMakeLists.txt
+++ b/src/crepe/util/CMakeLists.txt
@@ -1,9 +1,11 @@
 target_sources(crepe PUBLIC
 	log.cpp
+	fmt.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	color.h
 	log.h
+	fmt.h
 )
 
diff --git a/src/crepe/util/fmt.cpp b/src/crepe/util/fmt.cpp
new file mode 100644
index 0000000..8ef1164
--- /dev/null
+++ b/src/crepe/util/fmt.cpp
@@ -0,0 +1,33 @@
+#include <cstdarg>
+#include <cstdio>
+#include <string>
+
+#include "fmt.h"
+
+using namespace std;
+
+string crepe::util::va_stringf(va_list args, const char * fmt) {
+	va_list args_copy;
+	va_copy(args_copy, args);
+
+	size_t sz = vsnprintf(NULL, 0, fmt, args_copy) + 1;
+	char * msg = (char *) malloc(sz);
+	va_end(args_copy);
+
+	vsnprintf(msg, sz, fmt, args);
+
+	string out = msg;
+	free(msg);
+
+	va_end(args);
+
+	return out;
+}
+
+string crepe::util::stringf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	string out = va_stringf(args, fmt);
+	va_end(args);
+	return out;
+}
diff --git a/src/crepe/util/fmt.h b/src/crepe/util/fmt.h
new file mode 100644
index 0000000..44c426f
--- /dev/null
+++ b/src/crepe/util/fmt.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <string>
+
+namespace crepe::util {
+
+std::string va_stringf(va_list args, const char * fmt);
+std::string stringf(const char * fmt, ...);
+
+} // namespace crepe::util
diff --git a/src/crepe/util/log.cpp b/src/crepe/util/log.cpp
index f91d52c..0c2ce1e 100644
--- a/src/crepe/util/log.cpp
+++ b/src/crepe/util/log.cpp
@@ -3,6 +3,7 @@
 #include <cstdlib>
 #include <string>
 
+#include "fmt.h"
 #include "log.h"
 
 using namespace crepe::util;
@@ -14,37 +15,26 @@ static const char * const LOG_PREFIX[] = {
 	[log_level::ERROR] = "[ERR] ",
 };
 
-static void va_logf(enum log_level level, va_list args, const std::string fmt) {
-	va_list args_copy;
-	va_copy(args_copy, args);
-
-	// prepend log level and ensure newline
-	std::string format_fixed = LOG_PREFIX[level] + fmt;
-	if (!format_fixed.ends_with("\n")) format_fixed += "\n";
-
-	size_t sz = vsnprintf(NULL, 0, format_fixed.c_str(), args_copy) + 1;
-	char * msg = (char *) malloc(sz);
-	va_end(args_copy);
-
-	vsnprintf(msg, sz, format_fixed.c_str(), args);
+static void log(enum log_level level, const std::string & msg) {
+	using namespace std;
+	string out = string(LOG_PREFIX[level]) + msg;
+	if (!out.ends_with("\n")) out += "\n";
 
 	// TODO: also log to file or smth
-	printf("%s", msg);
+	printf("%s", out.c_str());
 	fflush(stdout);
-
-	free(msg);
 }
 
 void crepe::util::logf(const char * fmt, ...) {
 	va_list args;
 	va_start(args, fmt);
-	va_logf(crepe::util::log_level::DEBUG, args, fmt);
+	log(log_level::DEBUG, va_stringf(args, fmt));
 	va_end(args);
 }
 
 void crepe::util::logf(log_level level, const char * fmt, ...) {
 	va_list args;
 	va_start(args, fmt);
-	va_logf(level, args, fmt);
+	log(level, va_stringf(args, fmt));
 	va_end(args);
 }
diff --git a/src/crepe/util/log.h b/src/crepe/util/log.h
index 2b0fbe1..3e36f0a 100644
--- a/src/crepe/util/log.h
+++ b/src/crepe/util/log.h
@@ -7,7 +7,7 @@
 
 // utility macros
 #define _crepe_logf_here(fmt, ...) \
-	crepe::util::logf(util::log_level::DEBUG, "%s%s (%s:%d)" fmt "\n", \
+	crepe::util::logf(util::log_level::DEBUG, "%s%s (%s:%d)%s" fmt "\n", \
 					  crepe::util::color::FG_WHITE, __PRETTY_FUNCTION__, \
 					  __FILE_NAME__, __LINE__, crepe::util::color::RESET, \
 					  __VA_ARGS__)
@@ -15,7 +15,7 @@
 // very illegal global function-style macros
 // NOLINTBEGIN
 #define dbg_logf(fmt, ...) _crepe_logf_here(": " fmt, __VA_ARGS__)
-#define dbg_log(str) _crepe_logf_here(": %s", str)
+#define dbg_log(str) _crepe_logf_here("%s: " str, "")
 #define dbg_trace() _crepe_logf_here("%s", "")
 // NOLINTEND