1 files changed, 78 insertions, 0 deletions
diff --git a/src/undo.cpp b/src/undo.cpp
new file mode 100644
index 0000000..8072540
--- /dev/null
+++ b/src/undo.cpp
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <string.h>
+#include <bsd/sys/queue.h>
+
+#include <glib.h>
+#include <glib/gstdio.h>
+
+#include <Scintilla.h>
+
+#include "sciteco.h"
+#include "interface.h"
+#include "undo.h"
+
+//#define DEBUG
+
+UndoStack undo;
+
+void
+UndoTokenMessage::run(void)
+{
+	interface.ssm(iMessage, wParam, lParam);
+}
+
+void
+UndoStack::push(UndoToken *token)
+{
+	if (enabled) {
+#ifdef DEBUG
+		g_printf("UNDO PUSH %p\n", token);
+#endif
+		token->pos = strlen(cmdline);
+		SLIST_INSERT_HEAD(&head, token, tokens);
+	} else {
+		delete token;
+	}
+}
+
+void
+UndoStack::push_msg(unsigned int iMessage, uptr_t wParam, sptr_t lParam)
+{
+	push(new UndoTokenMessage(iMessage, wParam, lParam));
+}
+
+void
+UndoStack::pop(gint pos)
+{
+	while (!SLIST_EMPTY(&head) && SLIST_FIRST(&head)->pos >= pos) {
+		UndoToken *top = SLIST_FIRST(&head);
+#ifdef DEBUG
+		g_printf("UNDO POP %p\n", top);
+		fflush(stdout);
+#endif
+
+		top->run();
+
+		SLIST_REMOVE_HEAD(&head, tokens);
+		delete top;
+	}
+}
+
+void
+UndoStack::clear(void)
+{
+	UndoToken *cur;
+
+	while ((cur = SLIST_FIRST(&head))) {
+		SLIST_REMOVE_HEAD(&head, tokens);
+		delete cur;
+	}
+}
+
+UndoStack::~UndoStack()
+{
+	UndoToken *token, *next;
+
+	SLIST_FOREACH_SAFE(token, &head, tokens, next)
+		delete token;
+}