1 files changed, 57 insertions, 0 deletions
diff --git a/undo.cpp b/undo.cpp
new file mode 100644
index 0000000..f5fc81d
--- /dev/null
+++ b/undo.cpp
@@ -0,0 +1,57 @@
+#include <string.h>
+#include <bsd/sys/queue.h>
+
+#include <glib.h>
+
+#include <Scintilla.h>
+
+#include "sciteco.h"
+#include "undo.h"
+
+UndoStack undo;
+
+UndoToken::UndoToken() : pos(strlen(cmdline)) {}
+
+void
+UndoTokenMessage::run(void)
+{
+	editor_msg(iMessage, wParam, lParam);
+}
+
+void
+UndoStack::push_msg(unsigned int iMessage, uptr_t wParam, sptr_t lParam)
+{
+	UndoToken *token = new UndoTokenMessage(iMessage, wParam, lParam);
+	SLIST_INSERT_HEAD(&head, token, tokens);
+}
+
+#if 0
+template <typename Type>
+void
+UndoStack::push_var(Type &variable, Type value)
+{
+	UndoToken *token = new UndoTokenVariable<Type>(variable, value);
+	SLIST_INSERT_HEAD(&head, token, tokens);
+}
+#endif
+
+void
+UndoStack::pop(gint pos)
+{
+	while (!SLIST_EMPTY(&head) && SLIST_FIRST(&head)->pos >= pos) {
+		UndoToken *top = SLIST_FIRST(&head);
+
+		top->run();
+
+		SLIST_REMOVE_HEAD(&head, tokens);
+		delete top;
+	}
+}
+
+UndoStack::~UndoStack()
+{
+	UndoToken *token, *next;
+
+	SLIST_FOREACH_SAFE(token, &head, tokens, next)
+		delete token;
+}