1 files changed, 82 insertions, 0 deletions

diff --git a/undo.h b/undo.h
new file mode 100644
index 0000000..29ec70f
--- /dev/null
+++ b/undo.h
@@ -0,0 +1,82 @@
+#ifndef __UNDO_H
+#define __UNDO_H
+
+#include <bsd/sys/queue.h>
+
+#include <glib.h>
+
+#include <Scintilla.h>
+
+class UndoToken {
+public:
+	SLIST_ENTRY(UndoToken) tokens;
+
+	gint pos;
+
+	UndoToken();
+
+	virtual void run() = 0;
+};
+
+class UndoTokenMessage : public UndoToken {
+	unsigned int iMessage;
+	uptr_t wParam;
+	sptr_t lParam;
+
+public:
+	UndoTokenMessage(unsigned int _iMessage,
+			 uptr_t _wParam = 0, sptr_t _lParam = 0)
+			: UndoToken(), iMessage(_iMessage),
+			  wParam(_wParam), lParam(_lParam) {}
+
+	void run(void);
+};
+
+template <typename Type>
+class UndoTokenVariable : public UndoToken {
+	Type *ptr;
+	Type value;
+
+public:
+	UndoTokenVariable(Type &variable, Type _value)
+			 : UndoToken(), ptr(&variable), value(_value) {}
+
+	void
+	run(void)
+	{
+		*ptr = value;
+	}
+};
+
+extern class UndoStack {
+	SLIST_HEAD(undo_head, UndoToken) head;
+
+public:
+	UndoStack()
+	{
+		SLIST_INIT(&head);
+	}
+	~UndoStack();
+
+	void push_msg(unsigned int iMessage,
+		      uptr_t wParam = 0, sptr_t lParam = 0);
+
+	template <typename Type>
+	void
+	push_var(Type &variable, Type value)
+	{
+		UndoToken *token = new UndoTokenVariable<Type>(variable, value);
+		SLIST_INSERT_HEAD(&head, token, tokens);
+	}
+
+	template <typename Type>
+	inline void
+	push_var(Type &variable)
+	{
+		push_var<Type>(variable, variable);
+	}
+
+	void pop(gint pos);
+} undo;
+
+#endif
\ No newline at end of file