From ba56dfc489f6a73f856479c05675cba71639b3ee Mon Sep 17 00:00:00 2001
From: Michael Ochmann <miko007@me.com>
Date: Mon, 6 Mar 2017 22:15:48 +0100
Subject: [PATCH] added history draft

---
 src/Editor.hpp  |  2 +-
 src/History.cpp |  5 +++++
 src/History.hpp | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 src/History.cpp
 create mode 100644 src/History.hpp

diff --git a/src/Editor.hpp b/src/Editor.hpp
index 301277c..606025a 100644
--- a/src/Editor.hpp
+++ b/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();
diff --git a/src/History.cpp b/src/History.cpp
new file mode 100644
index 0000000..1f99d65
--- /dev/null
+++ b/src/History.cpp
@@ -0,0 +1,5 @@
+//
+// Created by miko on 06.03.17.
+//
+
+#include "History.hpp"
diff --git a/src/History.hpp b/src/History.hpp
new file mode 100644
index 0000000..f871609
--- /dev/null
+++ b/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();
+		}
+	};
+
+}
\ No newline at end of file