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diff --git a/src/document.h b/src/document.h
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+/*
+ * Copyright (C) 2012-2013 Robin Haberkorn
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DOCUMENT_H
+#define __DOCUMENT_H
+
+#include <glib.h>
+
+#include <Scintilla.h>
+
+#include "sciteco.h"
+#include "interface.h"
+#include "undo.h"
+
+/*
+ * Classes
+ */
+
+/*
+ * NOTE: The only reason this is called TECODocument
+ * is to prevent a nameclash with Scintilla which
+ * does not use a proper namespace for its public
+ * symbols...
+ */
+class TECODocument {
+	typedef const void *SciDoc;
+	SciDoc doc;
+
+	/* updated/restored only when required */
+	gint dot;
+	gint first_line;
+	gint xoffset;
+
+public:
+	TECODocument() : doc(NULL)
+	{
+		reset();
+	}
+	virtual ~TECODocument()
+	{
+		if (is_initialized())
+			interface.ssm(SCI_RELEASEDOCUMENT, 0, (sptr_t)doc);
+	}
+
+	inline bool
+	is_initialized(void)
+	{
+		return doc != NULL;
+	}
+
+	void edit(void);
+	void undo_edit(void);
+
+	void update(void);
+	inline void
+	update(const TECODocument &from)
+	{
+		dot = from.dot;
+		first_line = from.first_line;
+		xoffset = from.xoffset;
+	}
+
+	inline void
+	reset(void)
+	{
+		dot = first_line = xoffset = 0;
+	}
+	inline void
+	undo_reset(void)
+	{
+		undo.push_var(dot);
+		undo.push_var(first_line);
+		undo.push_var(xoffset);
+	}
+
+	void exchange(TECODocument &other);
+	inline void
+	undo_exchange(void)
+	{
+		undo.push_var(doc);
+		undo_reset();
+	}
+};
+
+#endif