added history draft

src/Editor.hpp

@@ -60,7 +60,7 @@ namespace groove {
 				return;
 			}
 			if (this->x >= this->buffer->linebuffer().at(this->y).length()) {
-				int length = this->buffer->linebuffer().at(this->y).length();
+				int length = static_cast<int>(this->buffer->linebuffer().at(this->y).length());
 				this->x = length > 0 ? length - 1 : 0;
 			}
 			this->scrollUp();

src/History.cpp

@@ -0,0 +1,5 @@
+//
+// Created by miko on 06.03.17.
+//
+
+#include "History.hpp"

src/History.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <functional>
+#include <memory>
+
+namespace groove {
+
+	struct HistoryNode {
+		std::shared_ptr<HistoryNode> last;
+		std::shared_ptr<HistoryNode> next;
+		std::function<void()> undo, redo;
+		HistoryNode(std::function<void()> undo, std::function<void()> redo,
+					std::shared_ptr<HistoryNode> last = nullptr,
+					std::shared_ptr<HistoryNode> next = nullptr) :
+				undo(undo), redo(redo), last(last), next(next) {}
+	};
+
+	class History {
+	private:
+		std::shared_ptr<HistoryNode> begin;
+		std::shared_ptr<HistoryNode> end;
+	public:
+		History() : begin(nullptr), end(nullptr) {}
+		void push(std::function<void()> undo, std::function<void()> redo) {
+			this->end->next = std::make_shared<HistoryNode>(undo, redo, this->end);
+		}
+
+		void pop() {
+			this->end = this->end->last;
+		}
+
+		void undo() {
+			this->end->undo();
+			this->end = this->end->last;
+		}
+
+		void redo() {
+			this->end->redo();
+		}
+	};
+
+}