rename engine to src

src/action.h

@@ -0,0 +1,29 @@
+#pragma once
+
+class Action
+{
+public:
+    bool was_saved = false;
+    virtual void run() = 0;
+    virtual void undo() = 0;
+    virtual Action* get_redo() = 0;
+    virtual size_t memory() = 0;
+    virtual ~Action(){};
+};
+
+class ActionManager
+{
+public:
+    static ActionManager I;
+    std::stack<std::unique_ptr<Action>> m_actions;
+    std::stack<std::unique_ptr<Action>> m_redos;
+    size_t m_memory = 0;
+    static void add(Action* action);
+    static void undo();
+    static void redo();
+    static void clear();
+    static bool empty()
+    {
+        return I.m_actions.empty();
+    }
+};